Articles de revues : « Jet blast »

1

Masato, Taguchi, Semba Naoki, Mori Koichi, Nakamura Yoshiaki et Ishiko Keiichi. « 1037 EXPERIMENTAL STUDY ON JET BLAST AT LABOLATORY SCALE ». Proceedings of the International Conference on Jets, Wakes and Separated Flows (ICJWSF) 2013.4 (2013) : _1037–1_—_1037–5_. http://dx.doi.org/10.1299/jsmeicjwsf.2013.4._1037-1_.

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Su, Dengfeng, Dandan Zheng et Lingang Zhao. « Experimental Study and Numerical Simulation of Dynamic Stress-Strain of Directional Blasting with Water Jet Assistance ». Shock and Vibration 2019 (24 mars 2019) : 1–15. http://dx.doi.org/10.1155/2019/1659175.

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Effective control of the explosive energy and the propagation direction of blast-induced crack and minimizing damage of remaining rock mass are the main purposes of directional-controlled blasting. In this paper, the experimental test on blast strain fields affected by water jet slot and blasthole wall protection material is conducted. Next, the FEM software ANSYS/LSDYNA is used to simulate the blast‐induced crack propagation and the blast stress wave transmission of different types of blasthole, and the distribution and evolution law of dynamic blast stress are also analyzed. The results indicate that the existence of blasthole wall protection material is not only beneficial to the “guiding effect” of blast‐induced crack propagation of water jet slot but also beneficial to reduce blast-induced damage of remaining rock mass. Besides, the bigger Dm/rb is, the weaker the “guiding effect” and “blasthole wall protection effect” by water jet slot and wall protection material are.

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Wang, Haifu, Liangcai Cai, Xiaolei Chong et Hao Geng. « Experimental Study of the Jet Engine Exhaust Flow Field of Aircraft and Blast Fences ». PROMET - Traffic&Transportation 27, n^o 2 (24 avril 2015) : 181–90. http://dx.doi.org/10.7307/ptt.v27i2.1545.

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A combined blast fence is introduced in this paper to improve the solid blast fences and louvered ones. Experiments of the jet engine exhaust flow (hereinafter jet flow for short) field and tests of three kinds of blast fences in two positions were carried out. The results show that the pressure and temperature at the centre of the jet flow decrease gradually as the flow moves farther away from the nozzle. The pressure falls fast with the maximum rate of 41.7%. The dynamic pressure 150 m away from the nozzle could reach 58.8 Pa, with a corresponding wind velocity of 10 m/s. The temperature affected range of 40°C is 113.5×20 m. The combined blast fence not only reduces the pressure of the flow in front of it but also solves the problems that the turbulence is too strong behind the solid blast fences and the pressure is too high behind the louvered blast fences. And the pressure behind combined blast fence is less than 10 Pa. The height of the fence is related to the distance from the jet nozzle. The nearer the fence is to the nozzle, the higher it is. When it is farther from the nozzle, its height can be lowered.

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Apazidis, N., S. Sembian et M. Liverts. « Supersonic jet by blast wave focusing ». Physics of Fluids 33, n^o 12 (décembre 2021) : 126101. http://dx.doi.org/10.1063/5.0068309.

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Su, Dengfeng, Yong Kang, Dongyang Li, Xiaochuan Wang et Fuwen Yan. « Analysis and Numerical Simulation on the Reduction Effect of Stress Waves Caused by Water Jet Slotting Near Blasting Source ». Shock and Vibration 2016 (2016) : 1–18. http://dx.doi.org/10.1155/2016/5640947.

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As one of the most serious “side effects” of blast excavation, blast-induced vibration must be controlled for existing buildings and human beings. This paper proposes a method for blast-induced vibration reduction with water jet assistance according to the cutting characters of low-noised, environment-friendly water jet. The mechanism of vibration-isolation with water jet assistance was analyzed, and the stress wave energy attenuation models were established based on blasting theory and stress wave theory. Influence law on shock wave attenuation by vibration-isolation slot was studied by numerical simulation. Simulation results agree with the theoretical analysis roughly. The results of this study put forward a method for blast-induced vibration near blasting source and provide a certain theoretical basis.

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Worden, Theodore J., Chiang Shih et Farrukh S. Alvi. « Supersonic Jet Impingement on a Model-Scale Jet Blast Deflector ». AIAA Journal 55, n^o 8 (juin 2017) : 2522–36. http://dx.doi.org/10.2514/1.j055664.

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Kumar, Abhijeet, et Srikrishna Sahu. « Liquid jet breakup unsteadiness in a coaxial air-blast atomizer ». International Journal of Spray and Combustion Dynamics 10, n^o 3 (22 mars 2018) : 211–30. http://dx.doi.org/10.1177/1756827718760905.

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The aim of this paper is to experimentally characterize the liquid jet breakup unsteadiness in a coaxial air-blast atomizer. The current research focuses on the measurement of the fluctuations of the jet breakup length and the flapping instability of the liquid jet, which contribute to the downstream fluctuations of the spray characteristics. The optical connectivity technique was used to measure the instantaneous breakup length of the water jet. Also, time resolved shadowgraph images of the primary jet breakup process were captured by high-speed imaging to characterize the jet instabilities at different axial locations from the atomizer exit. Experiments were performed for a wide range of air-to-liquid momentum flux ratio ( M) and aerodynamic Weber number ( Weg) corresponding to membrane- and/or fiber breakup mode of the jet disintegration process. The mean jet breakup length was found to vary inversely with M through a power law relation in agreement with the literature, while the breakup length fluctuations were found to first decrease and then increase with M. In order to capture the unsteady dynamics of the jet breakup process, the proper orthogonal decomposition analysis of the optical connectivity images was performed. The jet flapping and the fluctuations of the jet breakup length were identified as the second and the third spatial proper orthogonal decomposition modes, respectively, for all operating conditions of the atomizer. The amplitude and the frequency of the instabilities were measured by temporal tracking of the liquid–air interface on the shadowgraph images. The disturbance close to the injector exit corresponds to the Kelvin–Helmholtz instability, while close to the jet breakup point the jet exhibits the flapping instability, which is characterized by lateral oscillation of the jet about the atomizer axis. The influence of the liquid jet Reynolds number and momentum flux ratio on the KH and the flapping instabilities are examined.

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Ma, Song, Jianguo Tan, Xiankai Li et Jiang Hao. « The effect analysis of an engine jet on an aircraft blast deflector ». Transactions of the Institute of Measurement and Control 41, n^o 4 (26 mars 2018) : 990–1001. http://dx.doi.org/10.1177/0142331218755892.

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This paper establishes a novel mathematical model for computing the plume flow field of a carrier-based aircraft engine. Its objective is to study the impact of jet exhaust gases with high temperature, high speed and high pressure on the jet blast deflector. The working condition of the nozzle of a fully powered on engine is first determined. The flow field of the exhaust jet is then numerically simulated at different deflection angle using the three-dimensional Reynolds averaged Navier–Stokes equations and the standard [Formula: see text]-[Formula: see text] turbulence method. Moreover, infra-red temperature tests are further carried out to test the temperature field when the jet blast deflector is at the [Formula: see text] deflection angle. The comparison between the simulation results and the experimental results show that the proposed computation model can perfectly describe the system. There is only 8–10% variation between them. A good verification is achieved. Moreover, the experimental results show that the jet blast deflector plays an outstanding role in driving the high-temperature exhaust gases. It is found that [Formula: see text] may be the best deflection angle to protect the deck and the surrounding equipment effectively. These data results provide a valuable basis for the design and layout optimization of the jet blast deflector and deck.

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Loob, William. « Blast from the Past ». Mechanical Engineering 121, n^o 08 (1 août 1999) : 64–66. http://dx.doi.org/10.1115/1.1999-aug-6.

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This article presents a review about the jet engine testing facilities of the Naval Air Warfare Center Aircraft Division in Trenton, NJ, that had to be moved to a base run by another branch of the military, the Arnold Engineering Development Center at Arnold Air Force Base in Tennessee. The jet engine testing complex at Trenton had been built in the 1950s. The restriction effectively ruled out any upgrades so long as the Navy’s engine test requirements could be met by replicating the capabilities of the old facility. The natural tendency of the engineers and planners looking at the project was to think immediately about how the facility could be improved with modern designs. For the restriction on not improving the test capability at Trenton, the project ironically provided an expansion of services. This is built to subject the Navy engines to definite environmental conditions, and as long as the Navy has that kind of test requirement. It is a capability that is available not only to the Navy and Air Force, but to the Army, Marines, and private industry as well.

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IMAIZUMI, Jun, Hatsuhiko USAMI et Junji SUGISHITA. « 2131 Development of slurry jet blast machining ». Proceedings of the JSME annual meeting 2005.1 (2005) : 571–72. http://dx.doi.org/10.1299/jsmemecjo.2005.1.0_571.

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Xiao, Xian Bo, Xiang Jun Kong, Ya Jie Shi et Si Yuan Yao. « Jet Blast Resistance Experiment of Engineered Material Arresting System ». Advanced Materials Research 750-752 (août 2013) : 2244–47. http://dx.doi.org/10.4028/www.scientific.net/amr.750-752.2244.

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Engineered materials could arrest aircrafts rushing out of runway, but its fragile and can be easily damaged by jet blast exhausted by taking off aircraft nearby. Engineered material unit coating and encapsulation were described in this paper, and a jet blast resistance experiment is designed to quantitatively measure the units resistant capability. In this experiment, a test bed built by units will receive a taking-off Boeing 737-300 aircrafts jet blast for over 60 seconds. The test order decreased distance from aircraft tail to the test bed. And the predicted air velocity and temperature was calculated through aircrafts characteristics contour. All the design made the experiment high reliable and economical. Experimental result indicated that the nearest distance from the test bed to aircraft tail could be 15 meters, and this experiment result has already been used for design of the arresting system in a Chinese civil airport.

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Li, Zheng, Zhiwei Shi et Hai Du. « Analytical Model : Characteristics of Nanosecond Pulsed Plasma Synthetic Jet Actuator in Multiple-Pulsed Mode ». Advances in Applied Mathematics and Mechanics 9, n^o 2 (9 janvier 2017) : 439–62. http://dx.doi.org/10.4208/aamm.2015.m1297.

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AbstractMulti-field coupling simulation method based on the physical principles is used to simulate the discharge characteristics of nanosecond pulsed plasma synthetic jet actuator. Considering the effect of the energy transferring for air, the flow characteristics of nanosecond pulsed plasma synthetic jet actuator are simulated. The elastic heating sources and ion joule heating sources are the two main sources of energy. Through the collisions, the energy of ions is transferred to the neutral gas quickly. The flow characteristics of a series of blast waves and the synthetic jet which erupt from the plasma synthetic jet (PSJ) actuator are simulated. The blast wave not only promotes outward, but also accelerates the gas mixing the inhaled gas from the outside cavity with the residual gas inside the cavity. The performances of PSJ actuator fluctuate in the first three incentive cycles and become stable after that.

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Zhang, Yan, Robert P. Rudis, Frank Y. Wang et Edward A. Spitzer. « Simulation of Jet Blast Effect on Landing Aircraft ». Air Traffic Control Quarterly 9, n^o 3 (juillet 2001) : 211–27. http://dx.doi.org/10.2514/atcq.9.3.211.

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He, Xin, Yaqing Chen, Yilong Ma, Dengfeng Hu et Haoran Gao. « Hybrid Numerical Simulation of Jet Blast Distance of a Departing Aircraft ». Mathematical Problems in Engineering 2021 (30 mars 2021) : 1–11. http://dx.doi.org/10.1155/2021/5597414.

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A hybrid numerical simulation method was established by combining the Spalart-Allmaras (SA) turbulence model and detached eddy simulation (DES). Numerical simulations were carried out to model cold and hot spray conditions of a nozzle without considering the internal flow of an engine to determine jet conditions. Analysis results show that the calculated hot spray results more in line with the reality. The jet effect of a typical aircraft engine was simulated numerically to determine the distance influenced by the jet blast from a departing aircraft engine.

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Huo, Guotao, Zhonghai Ma, Yeqing Huang, Songlin Nie et Zhenhua Zhang. « Numerical Simulation and Experimental Investigation of Rotating Blade Centrifugal Jet in Slurry Blast Device Used for Steel Strip Descaling ». Applied Sciences 12, n^o 1 (4 janvier 2022) : 478. http://dx.doi.org/10.3390/app12010478.

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Under the requirement of clean production, a new type of slurry blast device for mechanically removing oxide scale on the surface of steel strips is presented, which can avoid the serious problems of rapid wear, low service life, and low efficiency of the traditional abrasive water jet with a nozzle. In this paper, the numerical simulation of the rotating blade centrifugal jet in the slurry blast device is conducted based on CFD, where the DPM and the erosion model are innovatively employed to simulate the movement characteristics of abrasive particles and the erosion rate of mixed slurry on the surface of the steel strip. Simulation results show that the erosion rate and particle motion velocity are proportional to the blade rotation speed and inlet pressure. Reasonable inlet pressure and rotation speed are helpful for improving the rust removal efficiency of slurry blast devices. An experimental system is established to validate the simulation results. The experimental results are consistent with the simulation trend, which exhibits that the developed slurry blast device is feasible for steel strip descaling. This work will play substantial guiding roles in the engineering optimization of slurry blast devices for steel strip descaling.

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Wang, Xue Ping, Zhen Wei Zhang, Cheng Zhang et Hong Bo Zhang. « Study on the Flow Field of Jet Plug-in Hot Blast Furnace ». Advanced Materials Research 354-355 (octobre 2011) : 564–68. http://dx.doi.org/10.4028/www.scientific.net/amr.354-355.564.

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This paper primarily focuses on the analysis on the heat exchange part’s flow field of the jet plug-in hot blast furnace, and comprehensively considers the temperature field aiming at obtaining the velocity and pressure distribution of the air and flue gas in each part of the heat transfer. Heat exchange mainly takes advantage of thermal convection about high temperature flue gas of the hot blast furnace and air, the flow situation of which have the direct effects on the heat exchange result in the heat transfer. The authors implemented the numerical simulation on flow field of the jet plug-in hot blast stove in heat transfer by using the method of finite element analysis. The conclusion of this paper provides the basis for the further enhancement of the machine life and optimization of the structure design.

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Cirrone, Donatella, Dmitriy Makarov, Andreas Friedrich, Joachim Grune, Keiji Takeno et Vladimir Molkov. « Blast Wave Generated by Delayed Ignition of Under-Expanded Hydrogen Free Jet at Ambient and Cryogenic Temperatures ». Hydrogen 3, n^o 4 (7 novembre 2022) : 433–49. http://dx.doi.org/10.3390/hydrogen3040027.

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An under-expanded hydrogen jet from high-pressure equipment or storage tank is a potential incident scenario. Experiments demonstrated that the delayed ignition of a highly turbulent under-expanded hydrogen jet generates a blast wave able to harm people and damage property. There is a need for engineering tools to predict the pressure effects during such incidents to define hazard distances. The similitude analysis is applied to build a correlation using available experimental data. The dimensionless blast wave overpressure generated by delayed ignition and the follow-up deflagration or detonation of hydrogen jets at an any location from the jet, ∆Pexp/P0, is correlated to the original dimensionless parameter composed of the product of the dimensionless ratio of storage pressure to atmospheric pressure, Ps/P0, and the ratio of the jet release nozzle diameter to the distance from the centre of location of the fast-burning near-stoichiometric mixture on the jet axis (30% of hydrogen in the air by volume) to the location of a target (personnel or property), d/Rw. The correlation is built using the analysis of 78 experiments regarding this phenomenon in the wide range of hydrogen storage pressure of 0.5–65.0 MPa and release diameter of 0.5–52.5 mm. The correlation is applicable to hydrogen free jets at ambient and cryogenic temperatures. It is found that the generated blast wave decays inversely proportional to the square of the distance from the fast-burning portion of the jet. The correlation is used to calculate the hazard distances by harm thresholds for five typical hydrogen applications. It is observed that in the case of a vehicle with onboard storage tank at pressure 70 MPa, the “no-harm” distance for humans reduces from 10.5 m to 2.6 m when a thermally activated pressure relief device (TPRD) diameter decreases from 2 mm to a diameter of 0.5 mm.

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KUSHIDA, Suguru, Kengo ASADA, Kozo FUJII et Kazuyuki SAKAMOTO. « Computational Analysis for Reducing Jet Wind from Blast Wave Generator ». Proceedings of the Fluids engineering conference 2018 (2018) : OS9–7. http://dx.doi.org/10.1299/jsmefed.2018.os9-7.

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KOBAYASHI, Shigeharu. « Blast Machining and Its Application : Especially in Jet Stream Blasting ». Journal of the Society of Mechanical Engineers 88, n^o 800 (1985) : 699–705. http://dx.doi.org/10.1299/jsmemag.88.800_699.

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Jozsa, Viktor, et Krisztian Sztanko. « Flame emission spectroscopy measurement of a steam blast and air blast burner ». Thermal Science 21, n^o 2 (2017) : 1021–30. http://dx.doi.org/10.2298/tsci150616062j.

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Control and online monitoring of combustion have become critical to meet the increasingly strict pollutant emission standards. For such a purpose, optical sensing methods, like flame emission spectrometry, seem to be the most feasible technique. Spectrometry is capable to provide information about the local equivalence ratio inside the flame through the chemiluminescence intensity ratio measurement of various radicals. In the present study, a 15 kW atmospheric burner was analyzed utilizing standard diesel fuel. Its plain jet type atomizer was operated with both air and steam atomizing mediums. Up to now, injection of steam into the reaction zone has attracted less scientific attention contrary to its practical importance. Spatial plots of OH*, CH*, and C2* excited radicals were analyzed at 0.35, 0.7, and 1 bar atomization gauge pressures, utilizing both atomizing mediums. The C2* was found to decrease strongly with increasing steam addition. The OH*/CH* and OH*/C2* chemiluminescence intensity ratios along the axis showed a divergent behavior in all the analyzed cases. Nevertheless, CH*/C2* chemiluminescence intensity ratio decreased only slightly, showing low sensitivity to the position of the spectrometer. The findings may be directly applied in steady operating combustion systems, i. e., gas turbines, boilers, and furnaces.

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Kovalevich, V. S., I. V. Kachanov, I. M. Shatalov, V. V. Veremenyuk et A. V. Filipchik. « Optimization of the taper angle of the jetter confuser used for reversible blast cleaning of propellers from corrosion ». Proceedings of the National Academy of Sciences of Belarus, Physical-Technical Series 66, n^o 2 (16 juillet 2021) : 194–201. http://dx.doi.org/10.29235/1561-8358-2021-66-2-194-201.

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It is shown that it is very effective to remove corrosion products from various surfaces, including the metal surface of the propeller, using the new technology of reverse-jet cleaning (RJC) developed by the authors. The RJS technology is based on the physical principle that the jet of the working fluid (pulp based on river sand or bentonite clay), upon impact with the surface to be cleaned, turns 180°, which leads to an increase in the jet effect on the surface to be cleaned by 1.5–2 times due to the occurrence of the reactive component. To ensure the marked turn of the jet, an original design of the body was developed, which is distinguished by a patent novelty. One of the main elements in this design is a jet-forming device in the form of a confuser. The presented theoretical studies of the pressure loss of the working fluid in the confuser channel, based on the study of the pressure loss function to the extremum, which made it possible to obtain a dependence for calculating the optimal taper angle in a wide range of Reynolds numbers characterizing the turbulent mode of motion taking into account the influence of the working fluid density and its dynamic viscosity, the average speed of movement of the working fluid, the radius of the confuser, as well as the coefficient of equivalent roughness, i.e. from gradual wear of the confuser channel. The resulting dependence can be recommended for calculation in the design of jet cleaning devices and other installations of jet technology.

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McIntosh, M. J. « The Effect of Particle Feed Rate on the Plastic Media Blast Jet ». Journal of Engineering for Industry 114, n^o 4 (1 novembre 1992) : 435–40. http://dx.doi.org/10.1115/1.2900695.

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Paint removal from military aircraft is often done by plastic media blasting (PMB): the use of plastic grit in a conventional blast jet. However, there is some concern that PMB will cause damage. To help in evaluating this possibility, a “time of flight” meter is used to measure particle velocity in the jet, as a function of air pressure, distance from the nozzle, and particle feed rate, F. Using the data and a momentum balance, a semi-empirical model relating these variables is developed and used for analysis of the effect of F on the intensity of kinetic energy delivery, E, to a work piece. The analysis shows that F has several important effects on E. These methods and results will be useful for damage studies and in production work.

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van Eerten, Hendrik. « Gamma-ray burst afterglow blast waves ». International Journal of Modern Physics D 27, n^o 13 (octobre 2018) : 1842002. http://dx.doi.org/10.1142/s0218271818420026.

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The various stages of baryonic gamma-ray burst (GRB) afterglow blast waves are reviewed. These are responsible for the afterglow emission from which much of our understanding of gamma-ray bursts derives. Initially, the blast waves are confined to the dense medium surrounding the burster (stellar envelope or dense wind), giving rise to a jet-cocoon structure. A massive ejecta is released and potentially fed by ongoing energy release from the burster and a forward–reverse shock system is set up between ejecta and ambient density. Ultimately the blast wave spreads sideways and slows down, and the dominant afterglow emission shifts from X-rays down to radio. Over the past years significant progress has been made both observationally and theoretically/numerically in our understanding of these blast waves, unique in the universe due to their often incredibly high initial Lorentz factors of 100–1000. The recent discovery of a short gamma-ray burst counterpart to a gravitational wave detection (GW 170817) brings the promise of a completely new avenue to explore and constrain the dynamics of gamma-ray burst blast waves.

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YOSHIDA, Seiji, Mitsumasa MAKIDA, Jun IINO, Hideshi YAMADA, Kazuo SHIMODAIRA, Takeshi YAMAMOTO et Shigeru HAYASHI. « PIV Measurement in Air Blast Fuel Nozzle for Jet Engine Combustor ». Journal of the Visualization Society of Japan 27, Supplement1 (2007) : 155–56. http://dx.doi.org/10.3154/jvs.27.supplement1_155.

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Robins, P. J., S. A. Austin et M. R. Richards. « The resistance of steel fibre concrete to VTOL engine jet blast ». Cement and Concrete Composites 16, n^o 1 (janvier 1994) : 57–64. http://dx.doi.org/10.1016/0958-9465(94)90031-0.

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Khalil, Maged F., Ashish Sangal, Alka Arora, Seema Niak, Zili He, William Steier et Madhumati Kalavar. « Can Exposure to Jet Fumes Lead to Acute Leukemia?. » Blood 108, n^o 11 (16 novembre 2006) : 5535. http://dx.doi.org/10.1182/blood.v108.11.5535.5535.

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Abstract Introduction: AML/MDS is usually diagnosed in older adults with median age of 64 in patients at time of diagnosis, after occupational exposure to organic solvents, such as benzene, or previous therapeutic exposure to alkylating agents, topoisomerase inhibitors, or ionizing radiation. We are presenting a case of AML/MDS in a young female without previous history of exposure to alkylating agents or ionizing radiation, but with history of exposure to jet fumes. Case Report: This is a 30-year old Carribean woman, chronic smoker, ethanol user, employed for eight years at the airport, working on the ground with heavy direct exposure to jet fumes, who presented with 2 weeks of progressive dyspnea, fatigue and bone pains. She was found to have pancytopenia, hemoglobin 2.8 gm/dL, platelets 37,000/mL, and neutrophils 1100/mL. Peripheral smear showed many nucleated red blood cells and blasts. Bone marrow aspiration was “dry” and bone biopsy revealed hypercellularity with dysplastic changes in erythrocyte, granulocyte and megakaryocytic lineages with 46% blasts. Flow cytometry of peripheral blood showed positivity for CD13, CD33, CD34, and CD117 and HLA-DR with complex cytogenetics showing deletions involving chromosomes 5q, 7q, 12p, 20q and loss of chromosome 17. Fluorescent in situ hybridization (FISH) studies were negative for t(15,17), MLL, t(8,21), inv(16) seen in classical de novo AML. FISH also did not show abnormalities in the probe regions 5q31, 7q31, 8cen and 20q12 of chromosomes 5, 7, 8 and 20 classically seen in de novo MDS. The blast cell morphology suggested acute myelocytic leukemia on a background of myelodysplasia. Precise FAB subtype was not possible in the absence of special stains like myeloperoxidase, and specific and non-specific esterase stains. The patient was treated with two induction courses of cytosine arabinoside and idarubicin. With persistence of 4.5% blasts on the peripheral blood and severe bone marrow aplasia, she was referred for allogeneic stem cell transplantation, in view of failed induction remission and complex cytogenetics at presentation. Conclusion: Case-control studies of leukemia demonstrated only slight increase in risk of disease after many years of occupational or chemical exposures. More studies to investigate leukemia incidence in airport employees, or even communities near airports are needed.

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Hajji, Yassine, Denis Entemeyer, Jérôme Serri, Mustapha Yahiaoui, Abdel Tazibt et Thierry Grosdidier. « High Pressure Cryogenic Nitrogen Jet for Clean Coating Removal : Experimental Study of Polyamide Ablation ». Materials Science Forum 941 (décembre 2018) : 1651–55. http://dx.doi.org/10.4028/www.scientific.net/msf.941.1651.

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The potential of a recently developed technique that uses a clean supercritical High Pressure Cryogenic Nitrogen Jet (HPCryoN2Jet) for surface ablation and cleaning is depicted. In contrast to existent coating-removal techniques (chemical stripping, hydro-blast, water jet cleaning...), as nitrogen is naturally recycled in the air, this process has a high potential for surface treatment without any chemical and physical effluents or sewage disposal. The treatment consists in impacting the surface with a high pressure (up to 3500 bar) cryogenic nitrogen jet (down to-160°C). The pressurized cryogenic nitrogen exits from a nozzle - having generally a 0.2 to 0.5 mm diameter outlet - to form the high velocity (supersonic) nitrogen jet. In this contribution, the ability of the process to remove polymeric (PA) coatings is evaluated on different types of metallic substrates (Cu, Al, E24, 316L stainless steel). The mechanisms of chip formation have been visualized using a high speed camera. Coating failure is shown experimentally to occur downstream of the jet and the influence of the substrate thermal properties on the stripping efficiency of the PA coating is highlighted.

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Gaissinski, Igor, Yeshayahou Levy, Daniel Kutikov, Valery Sherbaum et Vladimir Rovenski. « Operation Study of Miniature Air-blast Atomizer under Very Low Liquid Pressures ». International Journal of Turbo & ; Jet-Engines 36, n^o 4 (18 novembre 2019) : 367–89. http://dx.doi.org/10.1515/tjj-2016-0073.

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Abstract Miniature air blast atomizers are intended for use in small jet engines. The typical miniature atomizer with rotating air outside the pressure swirl nozzle was investigated by theoretically and experimentally. The equations which describe the flow of rotating hollow liquid jet in a gaseous environment, where there is difference between outer and inner pressures of the liquid film were developed. The effects of surface tension, gravity forces, and inner-outer pressure difference on liquid film modes and its disintegration were considered. A set of the relevant equations was solved numerically. The initial conditions for the equations: pressure distribution inside and outside of the ‘onion’ as function of outer rotating air and liquid parameters, were obtained experimentally. The numerical results were verified by the experimental study. It was shown that exists two shapes of liquid film nearby nozzle exit – ‘onion’ and open film. Shape of the liquid film for the given nozzle pressure drop depends mainly on air pressure difference outside and inside the film. Two resulting spray modes are distinguished in droplet characteristics drastically. The results can be applied for estimation of the operational parameters of air-blast atomizers that operate with very low liquid pressure drop.

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Wang, Xue Ping, Zhen Wei Zhang et Hong Bo Zhang. « Study on the Temperature Field of Jet Plug-in Hot Blast Furnace ». Advanced Materials Research 338 (septembre 2011) : 231–35. http://dx.doi.org/10.4028/www.scientific.net/amr.338.231.

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This paper primarily focuses on the analysis on the heat exchange part’s temperature field of the jet plug-in hot blast furnace aiming at obtaining the temperature distribution of the heat exchange part. The authors took advantage of the method of the finite element analysis to study the temperature field. Through the analysis, local high temperature of the heat exchange part can be figured out. The paper also analyzes the parts with great temperature difference, study the reasons of causing these phenomenon and the negative impact on the furnace. The conclusion of this paper provides the basis for the further enhancement of the machine life and optimization of the structure design.

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Charalampous, Georgios, Yannis Hardalupas et Alex Taylor. « Structure of the Continuous Liquid Jet Core during Coaxial Air-Blast Atomisation ». International Journal of Spray and Combustion Dynamics 1, n^o 4 (décembre 2009) : 389–415. http://dx.doi.org/10.1260/175682709789685840.

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Shafagh, Soheil, et Marcello Papini. « The effects of blast lag in abrasive jet machined micro-channel intersections ». Precision Engineering 62 (mars 2020) : 162–69. http://dx.doi.org/10.1016/j.precisioneng.2019.12.001.

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Kravchenko, V. P., G. A. Baglyuk et A. I. Trotsan. « Effectiveness of Jet Milling for Producing Superfine Powders from Blast-Furnace Slag ». Powder Metallurgy and Metal Ceramics 55, n^o 11-12 (mars 2017) : 745–50. http://dx.doi.org/10.1007/s11106-017-9863-y.

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Wu, Zhao-Wei, Zhe-Hang Shi, Hui Zhao, Feng Yao, Hai-Feng Liu, Wei-Feng Li et Jian-Liang Xu. « Effects of bubbles in the liquid jet on the air-blast atomization ». Fuel 266 (avril 2020) : 117117. http://dx.doi.org/10.1016/j.fuel.2020.117117.

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Yue, Kuizhi, Liangliang Cheng, Hu Liu et Yunliang Wang. « Analysis of jet blast impact of embarked aircraft on deck takeoff zone ». Aerospace Science and Technology 45 (septembre 2015) : 60–66. http://dx.doi.org/10.1016/j.ast.2015.04.010.

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van der Horst, A. J., A. Kamble, R. A. M. J. Wijers, L. Resmi, D. Bhattacharya, E. Rol, R. Strom, C. Kouveliotou, T. Oosterloo et C. H. Ishwara-Chandra. « GRB 030329 : 3 years of radio afterglow monitoring ». Philosophical Transactions of the Royal Society A : Mathematical, Physical and Engineering Sciences 365, n^o 1854 (9 février 2007) : 1241–46. http://dx.doi.org/10.1098/rsta.2006.1993.

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Radio observations of gamma-ray burst (GRB) afterglows are essential for our understanding of the physics of relativistic blast waves, as they enable us to follow the evolution of GRB explosions much longer than the afterglows in any other wave band. We have performed a 3-year monitoring campaign of GRB 030329 with the Westerbork Synthesis Radio Telescopes and the Giant Metrewave Radio Telescope. Our observations, combined with observations at other wavelengths, have allowed us to determine the GRB blast wave physical parameters, such as the total burst energy and the ambient medium density, as well as to investigate the jet nature of the relativistic outflow. Further, by modelling the late-time radio light curve of GRB 030329, we predict that the Low-Frequency Array (30–240 MHz) will be able to observe afterglows of similar GRBs, and constrain the physics of the blast wave during its non-relativistic phase.

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Kumar, Manish, Srinibas Karmakar, Sonu Kumar et Saptarshi Basu. « Experimental investigation on spray characteristics of Jet A-1 and alternative aviation fuels ». International Journal of Spray and Combustion Dynamics 13, n^o 1-2 (juin 2021) : 54–71. http://dx.doi.org/10.1177/17568277211010140.

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Potential alternative fuels that can mitigate environmental pollution from gas turbine engines (due to steep growth in the aviation sector globally) are getting significant attention. Spray behavior plays a significant role in influencing the combustion performance of such alternative fuels. In the present study, spray characteristics of Kerosene-based fuel (Jet A-1) and alternative aviation fuels such as butyl butyrate, butanol, and their blends with Jet A-1 are investigated using an air-blast atomizer under different atomizing air-to-fuel ratios. Phase Doppler Interferometry has been employed to obtain the droplet size and velocity distribution of various fuels. A high-speed shadowgraphy technique has also been adopted to make a comparison of ligament breakup characteristics and droplet formation of these alternative biofuels with that of Jet A-1. An effort is made to understand how the variation in fuel properties (mainly viscosity) influences atomization. Due to the higher viscosity of butanol, the SMD is higher, and the droplet formation seems to be delayed compared to Jet A-1. In contrast, the lower viscosity of butyl butyrate promotes faster droplet formation. The effects of the blending of these biofuels with Jet A-1 on atomization characteristics are also compared with that of Jet A-1.

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Wang, Xue Ping, Ying Zhang, Pan Li et Zhen Wei Zhang. « Intensity Analysis on Heat Transfer of the Jet Plug-in Hot Blast Furnace ». Advanced Materials Research 396-398 (novembre 2011) : 1856–59. http://dx.doi.org/10.4028/www.scientific.net/amr.396-398.1856.

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This paper primarily focuses on the analysis on temperature, stress and strain distribution of the heat transfer in the jet plug-in hot blast furnace aiming at obtaining the parts of the heat transfer with relatively high heat stress according to the stress and strain distribution. The authors took advantage of the method of the finite element analysis to study the temperature field. Through the analysis, the authors can figure out that thermal stress can not be found in the highest temperature part, but in the parts with large temperature difference, and meanwhile this thesis puts forward the reasons causing these situations. The conclusion of this paper provides the basis for the further enhancement of the machine life and optimization of the structure design.

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Soga, Yuki, Hiroyuki Torikai et Akihiko Ito. « A125 Extinguishment characteristics of the jet diffusion flame by laser-induced blast wave ». Proceedings of the Thermal Engineering Conference 2013 (2013) : 19–20. http://dx.doi.org/10.1299/jsmeted.2013.19.

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Drake, R. P., et J. P. Knauer. « Design of jet-driven, radiative-blast-wave experiments for 10 kJ class lasers ». Astrophysics and Space Science 322, n^o 1-4 (25 novembre 2008) : 97–100. http://dx.doi.org/10.1007/s10509-008-9938-9.

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Mizukaki, T. « Visualization of developing high temperature supersonic impulse jet induced by blast wave simulator ». Journal of Visualization 10, n^o 1 (mars 2007) : 91–98. http://dx.doi.org/10.1007/bf03181808.

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Svetsov, V., M. Popova, V. Rybakov, V. Artemiev et S. Medveduk. « Jet and vortex flow induced by anisotropic blast wave : experimental and computational study ». Shock Waves 7, n^o 6 (1 décembre 1997) : 325–34. http://dx.doi.org/10.1007/s001930050087.

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Xu, Fan, Jin-Jun Geng, Xu Wang, Liang Li et Yong-Feng Huang. « Is the birth of PSR J0538+2817 accompanied by a gamma-ray burst ? » Monthly Notices of the Royal Astronomical Society 509, n^o 4 (23 novembre 2021) : 4916–22. http://dx.doi.org/10.1093/mnras/stab3342.

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ABSTRACT Recently, the Five-hundred-meter Aperture Spherical radio Telescope measured the three-dimensional velocity of PSR J0538+2817 with respect to its associated supernova remnant S147 and found a possible spin–velocity alignment for this pulsar. Here, we show that the high velocity and the spin–velocity alignment of this pulsar can be explained by the so-called electromagnetic rocket mechanism. In this framework, the pulsar is kicked in the direction of the spin axis, which naturally explains the spin–velocity alignment. We scrutinize the evolution of the pulsar and show that the kick process can create a highly relativistic jet at the opposite direction of the kick velocity. The lifetime and energetics of the jet is estimated. It is argued that the jet can generate a gamma-ray burst (GRB). The long-term dynamical evolution of the jet is calculated. It is found that the shock radius of the jet should expand to about 32 pc at present, which is well consistent with the observed radius of the supernova remnant S147 (32.1 ± 4.8 pc). Additionally, our calculations indicate that the current velocity of the GRB remnant should be about 440 km s−1, which is also roughly consistent with the observed blast-wave velocity of the remnant of S147 (500 km s−1).

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Miller, SAE, et Alexander N. Carr. « Theoretical investigation of alteration and radiation of large-scale structures due to jet impingement ». International Journal of Aeroacoustics 18, n^o 2-3 (20 décembre 2018) : 231–57. http://dx.doi.org/10.1177/1475472x18812810.

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Jet flows impinge on launch pad structures and aircraft carrier deck blast deflectors. Turbulent structures are deformed and acoustic radiation is reflected by the deflector. The coupling of reflected acoustic waves with the instability waves of the jet turbulence increases their amplitude and causes a feedback loop. Resultant far-field acoustic radiation is amplified. This amplification results in additional tones with significant spectral broadening occurring at frequencies corresponding to the constructive interference. We present a simple prediction methodology in the form of an acoustic analogy. The analogy accounts for reflected acoustic waves through a tailored Green’s function and models the large-scale structures as spatially and temporarily growing and decaying instability waves. The predictions are compared with two experimental datasets. Predictions compare favorably with measured frequencies and spectral broadening in the far-field.

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Zhao, Xin Yi, Ke Dong Zhou, Lei He, Ye Lu, Jia Wang et Qiu Zheng. « Numerical Simulation and Experiment on Impulse Noise in a Small Caliber Rifle with Muzzle Brake ». Shock and Vibration 2019 (9 septembre 2019) : 1–12. http://dx.doi.org/10.1155/2019/5938034.

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Blast waves generated from the muzzles of weapons may exert negative effects, such as shock waves and impulse noise. If the weapon is fired with a muzzle brake, these effects are recognized to be more severe. This paper discusses the influence of the muzzle brake on certain aeroacoustic noise characteristics based on numerical simulations and a corresponding experiment. The impulse noise, which is induced by complex jet flows discharging from small caliber rifles with muzzle brakes, is focused in this study. Computational fluid dynamics (CFD) and computational aeroacoustics (CAA) are combined to calculate the muzzle flow field and jet noise for cases with and without a muzzle brake, and then the data sets are carefully compared. The simulations indicate that the muzzle brake alters the muzzle flow field and directional distribution of the jet noise compared to a rifle sans muzzle brake. Deviations less than 7.6% between experimental data and simulation results validate the simulation model. The results presented in this paper may provide a workable reference for the prediction of muzzle noise and the optimization of muzzle brake designs.

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Chen, Xiuxiu, et Zhengzhong Sun. « Plasma kernel model and energy transformation characteristic of plasma synthetic jet actuator ». Physics of Fluids 34, n^o 12 (décembre 2022) : 126104. http://dx.doi.org/10.1063/5.0125089.

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This article conducted a theoretical, experimental, and numerical investigation to clarify the plasma kernel model and energy transformation characteristics of the plasma synthetic jet actuator (PSJA). Plasma kernel and blast wave theory were used to describe the formation and evolution of the arc-discharge energy deposition process and build a plasma kernel model. Schlieren experiment visualized the formation and evolution of the synthetic jet flow and used it as a validation of the numerical simulation. Five plasma synthetic jet actuators with different cavity volumes (128–512 mm3) and different discharge energy (2.8–11.3 mJ) were modeled numerically to investigate the energy transformation characteristic of PSJA. Results showed that plasma kernel radius and formation time could be theoretically predicted with specific deposition energy and correspond well with simulation results. The peak pressure and temperature rise in the cavity can also be calculated. Moreover, the proportion of kinetic energy increases linearly with non-dimensional deposition energy, while potential energy has a reverse tendency with non-dimensional cavity volume and deposition energy.

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Lee, Inchul, Dohun Kim et Jaye Koo. « LIQUID JET BREAKUP STRUCTURE AND TRANSFER EFFICIENCY OF A TWO-STAGE AIR-BLAST INJECTOR ». Atomization and Sprays 22, n^o 7 (2012) : 561–79. http://dx.doi.org/10.1615/atomizspr.2012005718.

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Su, D., Y. Kang, F. Yan, D. Zheng, X. Wang et M. Wei. « Crack Propagation Law Affected by Natural Fracture and Water Jet Slot under Blast Loading ». Combustion, Explosion, and Shock Waves 54, n^o 6 (novembre 2018) : 747–56. http://dx.doi.org/10.1134/s0010508218060151.

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Kim, Jung-Gyu, et Jae-Joon Song. « Abrasive water jet cutting methods for reducing blast-induced ground vibration in tunnel excavation ». International Journal of Rock Mechanics and Mining Sciences 75 (avril 2015) : 147–58. http://dx.doi.org/10.1016/j.ijrmms.2014.12.011.

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Kumar, Abhijeet, et Srikrishna Sahu. « Primary jet breakup dynamics in a coaxial air blast atomizer : Effect of nozzle geometry and air swirl on jet instabilities and atomization ». Indian Journal of Cryogenics 46, n^o 1 (2021) : 137–42. http://dx.doi.org/10.5958/2349-2120.2021.00024.8.

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Zhetessova, Gulnara, Tatyana Nikonova, Łukasz Gierz, Darkhan Zhunuspekov, Vassiliy Yurchenko et Olga Zharkevich. « Preparation of the Surface of Long-Dimensional Rods of Hydro-Cylinders for Thermal Spraying Using an Abrasive Jet ». Coatings 12, n^o 10 (10 octobre 2022) : 1514. http://dx.doi.org/10.3390/coatings12101514.

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Preliminary cleaning of the surface of hydraulic cylinder rods is of great importance for subsequent coating. The most widely used surface preparation for thermal spraying is jet-abrasive treatment. The shot blast modes provide the hardness and strength of the material being processed. The impact of the abrasive makes the surface rough, increasing the contact area. Experimental studies of jet-abrasive processing of the hydraulic cylinder rod surface, as well as its activation for the thermal spraying, were carried out. The prepared surface of the rod for thermal spraying must meet the requirements for surface roughness and the size of the hardened layer at work. The experiments made it possible to identify the optimal modes of jet-abrasive treatment, which affect surface roughness and abrasive penetration of abrasive. To obtain the desired roughness values, it is preferable to use the following: a steel shot with an abrasive particle size in the range of 0.3–1.5 mm, taking the compressed air pressure in the range of 0.4–0.7 MPa; processing time—within 3.5–5 min; counterflow angle with the surface—70–90°; consumption of abrasive particles—300–500 kg/h. A special installation for jet-abrasive processing has been designed, which makes it possible to restore the surfaces of long rods by thermal spraying directly at the site of operation of the large machines.

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