Готові списки джерел за темами / Water Shock Tube

Добірка наукової літератури з теми "Water Shock Tube"

Автор: Grafiati

Опубліковано: 6 вересня 2023

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Статті в журналах з теми "Water Shock Tube"

Hou, Zi-wei, Ning Li, Xiao-long Huang, Can Li, Yang Kang, and Chun-sheng Weng. "Three-dimensional numerical simulation on near-field pressure evolution of dual-tube underwater detonation." Physics of Fluids 34, no. 3 (March 2022): 033304. http://dx.doi.org/10.1063/5.0086527.

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The detonation-powered underwater engine, with the advantages of high specific impulse, high speed, and simple structure, has very broad application prospects in the field of underwater propulsion, and dual-tube combination is an effective means to improve its propulsion performance. In this work, near-field pressure evolution of shock waves and high-pressure zones between two detonation tubes is numerically studied. The two-fluid model and three-dimensional conservation element and solution element method are adopted to reveal the formation, intersection, and interaction of shock waves. Detonation waves generated by two detonation tubes decouple into shock waves after penetrating into water and form a high-pressure zone near each tube exit. The two leading shock waves intersect with each other in the propagation, creating the second high-pressure zone between two tubes. Then, a propagating forward merged new shock wave covers the two original wave-fronts and maintains higher pressure. Pressure evolution under different tube intervals, ignition delays, and filling conditions is also presented to discuss their influence on the performance of dual-tube detonation. The intensity and directivity of shock waves are found to be sensitive to these factors, complexly affecting the thrust components, which provides a depth understanding of dual-tube combination in the application.

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Ji, H., M. Mustafa, H. Khawaja, B. Ewan, and M. Moatamedi. "Design of water shock tube for testing shell materials." World Journal of Engineering 11, no. 1 (March 1, 2014): 55–60. http://dx.doi.org/10.1260/1708-5284.11.1.55.

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This paper presents design considerations for a shock tube experimental rig used to investigate the dynamic failure mechanisms of shell geometries subjected to water shock impact loading. In such setup, it is desirable that the drive pressure used within the tube can provide a wide range of impulsive loads on the test structures and some flexibility can be achieved on the applied pulse durations. With this aim a review of various existing shock tube experimental setup is presented and choices are made based on scientific merits. Finally design parameters are drawn for right set of conditions required for the experiments.

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Vukovic, Gordana, and Michael L. Corradini. "Liquid-Metal/Water Interactions in a Shock Tube." Nuclear Technology 115, no. 1 (July 1996): 46–60. http://dx.doi.org/10.13182/nt96-a35274.

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Chambers, G., H. Sandusky, F. Zerilli, K. Rye, R. Tussing, and Jerry Forbes. "Pressure Measurements on a Deforming Surface in Response to an Underwater Explosion in a Water-Filled Aluminum Tube." Shock and Vibration 8, no. 1 (2001): 1–7. http://dx.doi.org/10.1155/2001/146373.

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Experiments have been conducted to benchmark DYSMAS computer code calculations for the dynamic interaction of water with cylindrical structures. Small explosive charges were suspended using hypodermic needle tubing inside Al tubes filled with distilled water. Pressures were measured during shock loading by tourmaline crystal, carbon resistor and ytterbium foil gages bonded to the tube using a variety of adhesives. Comparable calculated and measured pressures were obtained for the explosive charges used, with some gages surviving long enough to record results after cavitation with the tube wall.

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ANDO, KEITA, T. SANADA, K. INABA, J. S. DAMAZO, J. E. SHEPHERD, T. COLONIUS, and C. E. BRENNEN. "Shock propagation through a bubbly liquid in a deformable tube." Journal of Fluid Mechanics 671 (February 15, 2011): 339–63. http://dx.doi.org/10.1017/s0022112010005707.

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Shock propagation through a bubbly liquid contained in a deformable tube is considered. Quasi-one-dimensional mixture-averaged flow equations that include fluid–structure interaction are formulated. The steady shock relations are derived and the nonlinear effect due to the gas-phase compressibility is examined. Experiments are conducted in which a free-falling steel projectile impacts the top of an air/water mixture in a polycarbonate tube, and stress waves in the tube material and pressure on the tube wall are measured. The experimental data indicate that the linear theory is incapable of properly predicting the propagation speeds of finite-amplitude waves in a mixture-filled tube; the shock theory is found to more accurately estimate the measured wave speeds.

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Buren, A. L. Van, and L. D. Luker. "Nonlinear wave propagation in a water‐filled, conical shock tube." Journal of the Acoustical Society of America 95, no. 5 (May 1994): 2864. http://dx.doi.org/10.1121/1.409504.

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Ke, Hanbing, Qi Xiao, Chengyi Long, Jialun Liu, Leitai Shi, and Linghong Tang. "A Modified Calculation Method for a Centered Water Nozzle Steam–Water Injector." Energies 15, no. 23 (December 2, 2022): 9159. http://dx.doi.org/10.3390/en15239159.

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A centered water nozzle steam–water injector is driven by cold water to pump steam at a low pressure and to produce a high outlet water pressure. It can be used as a safety pump in a light water reactor to inject cooling water into the reactor core with no power supply in case of an accident. In this study, a modified calculation method for a centered water nozzle steam–water injector is proposed and verified by experimental data in the literature. The calculation method consists of a water nozzle model, a steam nozzle model, a mixing section model, and a shock wave model. Comparisons between the calculated results and the experimental results under different inlet steam pressures, inlet water pressures, and back pressures are conducted, and the calculated results show good agreement with the experimental results. The calculated results with different back pressures show that no shock wave occurs in the mixing section when the back pressure is small, but with the back pressure increasing, the pressure undergoes a dramatic increase in the throat tube, and the shock wave position moves towards the inlet of the mixing section. Due to the complexity of shock wave characteristics, it is necessary to conduct a more in-depth study of shock wave characteristics in the mixing section to determine more detailed boundary conditions for shock wave generation.

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Sivakumar, A., and S. A. Martin Britto Dhas. "Shock-wave-induced nucleation leading to crystallization in water." Journal of Applied Crystallography 52, no. 5 (August 29, 2019): 1016–21. http://dx.doi.org/10.1107/s1600576719009488.

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It is well known that super-cooled materials can be crystallized under the application of shock waves. This is the first report describing crystallization from unsaturated liquids. Shock-wave-induced crystallization of salts from environmental ground and sea water samples is explored. A table-top pressure-driven shock tube is utilized so as to produce the required shock waves of Mach numbers 1.1, 1.2, 1.4, 2.2 and 4.7. The demonstration comprises a train of acoustic shock pulses applied to the water samples. As a consequence of the impact of the shock waves, the colourless water becomes turbid, following which tiny crystallites are precipitated at the bottom of the vessel after a few minutes. The obtained precipitate is subjected to powder X-ray diffraction and energy-dispersive X-ray spectroscopy analysis to confirm the nature of the settled particles and the elements present in them, respectively. From the observed results, it is concluded that shock-wave-induced crystallization in water provides an alternative method for removing dissolved salts from both ground and sea water samples.

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Neaves, Michael Dean, and Jack R. Edwards. "All-Speed Time-Accurate Underwater Projectile Calculations Using a Preconditioning Algorithm." Journal of Fluids Engineering 128, no. 2 (August 30, 2005): 284–96. http://dx.doi.org/10.1115/1.2169816.

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An algorithm based on the combination of time-derivative preconditioning strategies with low-diffusion upwinding methods is developed and applied to multiphase, compressible flows characteristic of underwater projectile motion. Multiphase compressible flows are assumed to be in kinematic and thermodynamic equilibrium and are modeled using a homogeneous mixture formulation. Compressibility effects in liquid-phase water are modeled using a temperature-adjusted Tait equation, and gaseous phases (water vapor and air) are treated as an ideal gas. The algorithm is applied to subsonic and supersonic projectiles in water, general multiphase shock tubes, and a high-speed water entry problem. Low-speed solutions are presented and compared to experimental results for validation. Solutions for high-subsonic and transonic projectile flows are compared to experimental imaging results and theoretical results. Results are also presented for several multiphase shock tube calculations. Finally, calculations are presented for a high-speed axisymmetric supercavitating projectile during the important water entry phase of flight.

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Igra, D., and K. Takayama. "Experimental Investigation of Two Cylindrical Water Columns Subjected to Planar Shock Wave Loading." Journal of Fluids Engineering 125, no. 2 (March 1, 2003): 325–31. http://dx.doi.org/10.1115/1.1538628.

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Two water columns with identical initial diameters of 4.8 mm were placed 30 mm apart inside a shock tube test section and were loaded by a shock wave of Mach number 1.47 in atmospheric air. The Weber and Reynolds numbers corresponding to these flow conditions are 6900 and 112,000, respectively. Double-exposure holographic interferometry was used to visualize the shock/water columns interaction. The process of the water columns deformation, displacement, and acceleration was well visualized and hence the drag coefficient of shock loaded water columns was evaluated. The front water column behaved virtually the same as a single water column under the same flow conditions. However, the displacement and acceleration of the rear water column was less significant than that of the front one. Hence, its drag coefficient is less. These results show that the front water column has affected the flow field around the rear water column.

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Дисертації з теми "Water Shock Tube"

Antonelli, Anna Giulia. "An experimental study of water BLEVE." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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A BLEVE is a physical explosion characterized by the sudden expansion of a liquefied gas under pressure and the vapor space above it. In this work, the analysis of a set of water BLEVE experiments was carried out both in terms of data processing and numerical modelling. The main purpose of the project was to investigate safety implications of a pipe rupture containing superheated water that may affect a steam generation system in a nuclear or chemical plant. The experimental campaign consisted in 27 explosive tests in which an instantaneous depressurization of the content was enabled by the use of a calibrated rupture disk. A flange calibrated for different dimensions of the releasing orifice was incorporated in the prototype to replicate a pipe failure for various nominal sizes. The analysis primarily focused on the pressure field distribution generated in the surroundings, in the form of multiple shock waves. First observations came directly from high-speed pressure data recorded, showing a high directionality of the blast, stronger in the vertical direction, and the independence of the lead shock on the initial liquid fill level. The intensity of the overpressure of the lead shock was found to be increasingly correlated with the opening size. Available theoretical methods were used to preliminarily estimate the first overpressure peak. Models based on real gas behaviour and adiabatic irreversible expansion gave the best approximation of the vertical overpressure, providing an energy conversion factor (energy contributing to the blast overpressure over the total expansion energy) comparable with values found in the literature. A few CFD simulations were then performed under a shock tube configuration to validate the widely accepted assumption that the lead pressure peak is exclusively depending on the expansion of the pressurized vapor space.

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Biasi, Pasqualalberto. "Modeling of the explosive phase change during a BLEVE event." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2022.

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A Boiling Liquid Expanding Vapour Explosion (BLEVE) is a physical explosion caused by the sudden bursting of a vessel containing a superheated liquid. The scientific community describes the BLEVE as a physical explosion and is trying to develop models to predict the strength of the shock waves generated. Taking into account the data provided by the experimental campaign on the BLEVE water, this paper focuses on the causes that may lead to the formation of the second external pressure peak. Many authors assume that this peak is influenced by the liquid/vapour phase transition that occurs in the tank after the sudden pressure drop. Using Scilab, a numerical model is created that can solve Euler's equations for the shock tube problem, simulating only the behavior of the vapour phase. The quality of the model is tested taking into account data obtained experimentally in laboratory-scale tests. Then, based on the EVUT (equal-velocity-unequal-temperature) model proposed in the literature, the boiling phenomenon caused by the sudden pressure drop is analysed. The "relaxation time model" is discussed for modelling the source terms. Using the developed model, the effects of boiling on the density, velocity and internal pressure profiles are investigated. Finally, the model is discussed by comparing it with the experimental data from the E27 test of the water BLEVE campaign

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Vukovic, Gordana. "Liquid metal - water interactions in a shock tube geometry." 1994. http://catalog.hathitrust.org/api/volumes/oclc/32046127.html.

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Samuelraj, I. Obed. "Experiments on Varying Intensity Air Blasts in Shock Tubes." Thesis, 2017. http://etd.iisc.ac.in/handle/2005/4251.

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Abstract In the recent past, with an increasing number of terrorist activities, blast related research has focused on conducting careful experiments to develop newer protection strategies. As field experiments using explosives themselves are very cumbersome and expensive, shock tubes are increasingly being employed to study these air-blast based phenomena as they can produce the instantaneous pressure rise that is associated with blast waves, minus the use of explosives. From the literature on shock tubes that are being used for blast loading, it was observed that no experiments have been reported in the sub-millisecond loading duration (near-field) regime as no extant facility has the capability to simulate the conditions in this regime. Even in reports on shock tubes being used to recreate far-field blast conditions (starting from _ 4 milliseconds), attention is not directed towards the shock tube experiment artefacts viz., repeated reflections inside the (closed) shock tube, and generation of a wave whose pressure remains steady for a time before dropping off like a blast wave. In this backdrop, shock tube experiments that pertain to the far-field conditions were first conducted and then quantified in terms of the equivalent TNT field explosion (’TNT equivalent’ in short). The decay time was brought down to 1:6 ms by using plastic diaphragms, and an insert to channel out the reflected shock pressure. Then, the role played by the artefacts of shock tube loading on plates was shown to erroneously increase the final deformation of metal plates by about 15%. While the effect of these artefacts on the micro-structure did not show a large difference, the frequency content of both pressure loadings (the artefact and the correct one), showed differences in the spectral content, which could potentially change the response of structures that are sensitive to the frequency content of the input pulse. These shock tube experiments were found to have a repeatability of 5.5% and the plate deformation experiments on this facility were in the dynamic regime of structural loading. Using a more repeatable diaphragm less shock tube (1%), experiments were then conducted with similar decay times but on a smaller shock tube to validate the digital image correlation (DIC) technique. This device was then used along with numerical computations on ABAQUS to try and explain a blast mitigation strategy that gave a reduction in deflection of up to 50% in the quasi-static regime. To generate even shorter decay times, experiments using a piston impacting a water column were conducted. While the blast pulses from this facility could be reported in terms of their TNT equivalent mass, a subsequent correlation with the explosion-based plate deflection data failed as the exact impulse that is imparted to the plate could not be correctly determined. A novel conical shock tube that can generate sub-millisecond decay times (the near field conditions) in air was then developed and experiments on different metal plates (mild steel, aluminium, copper) were conducted for the extreme case of structural loading, viz., impulsive loading. The plate deflection data from this facility compared very well with an empirical formula that is available for impulse loading of plates using explosives. Thus, the ability of this device to reproduce several features of a near-field air-blast loading - namely the elastic spring back, the impulsive loading of a plate, and a unique shape of the deformed plates - were all successfully demonstrated. The device was characterized at reduced pressures to have a repeatability of 5% and the spatial variation in the exit plane pressure was better than 7%. Using this device, a scaled equivalent of a possible explosion from an improvised explosive device (IED) was also administered to mice to explore the possibility of ultimately conducting controlled blast induced traumatic brain injury studies in the laboratory. Over the course of this work, the simulation capability of shock tubes over an extended range of air-blasts was demonstrated. In terms of TNT masses and stand-off distance, it is currently as follows: Far and mid-field range - using the diaphragm less shock tube (49 kg@5:3m –25 kg@8:4m), and using the vertical shock tube from (0:31 kg@0:86m–33 kg@6:4m); Near-field range: water shock tube (2 kg@0:63m) and the conical shock tube (0:04 kg@0:38m– 0:08 kg@0:56m).

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Книги з теми "Water Shock Tube"

Abd, I. J. Through-water shock from tubes under internal explosive loading. Manchester: UMIST, 1991.

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Частини книг з теми "Water Shock Tube"

Fransen, M. A. L. J., J. Hrubý, D. M. J. Smeulders, and M. E. H. van Dongen. "Water Nucleation Measurements in a Pulse-Expansion Wave Tube." In 30th International Symposium on Shock Waves 2, 1239–43. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-44866-4_78.

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Li, H., A. Farooq, R. D. Cook, D. F. Davidson, J. B. Jeffries, and R. K. Hanson. "A diode laser absorption sensor for rapid measurements of temperature and water vapor in a shock tube." In Shock Waves, 409–14. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-85168-4_65.

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Zhao, Zixiang, Zhongdi Duan, Hongxiang Xue, Yuchao Yuan, and Shiwen Liu. "Effects of Inlet Conditions on the Two-Phase Flow Water Hammer Transients in Elastic Tube." In Springer Proceedings in Physics, 955–72. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1023-6_81.

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AbstractTwo-phase flow water hammer events occur in the pipelines of the nuclear power systems and lead to transient and violent pressure shock to tube structures. For the sake of operation safety, the occurrence and severity of the two-phase water hammer should be carefully assessed. This paper presents a parameter analysis of the inlet conditions on the two-phase flow water hammer transients, with considering the elastic effect of the tube walls. A numerical model is established for the vapor-liquid two-phase flow based on the two-fluid six-equation modelling approach, with incorporating correlations and criterions for two-phase flow regime, interfacial interactions and heat transfer. The governing equations are transformed to matrix form expressed by characteristic variables, and solved using the splitting operator method and the total variation diminishing scheme. The accuracy of the model is verified against the experimental data in open literature. Then, the model is applied to investigate the effect of inlet velocity and inlet water temperature on the two-phase flow water hammer transients. The simulation results show that the increase of inlet velocity increases the pressure peak values and brings forward the onset of water hammer, and the increase of inlet temperature decreases the pressure shock. A comparison of the water hammer results between the elastic tube and rigid tube is further presented, and the effect of the elastic modulus on the water hammer is analyzed. The results also show that the pressure peak is largely affected by the tube diameter.

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Koita, T., Y. Zhu, and M. Sun. "Investigation of Bubble Collapse and Water Jet Induced by Underwater Explosion in a Rectangular Tube." In 28th International Symposium on Shock Waves, 27–32. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-25685-1_5.

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Sugiyama, Y., Y. Nakayama, K. Ohtani, K. Nishimura, and A. Matsuo. "Propagation Behavior and Mitigation of Shock Wave Along the Water Inside a Rectangular Tube." In 31st International Symposium on Shock Waves 1, 95–101. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-91020-8_9.

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Wisse, C. J., M. E. H. van Dongen, and D. M. J. Smeulders. "Shock-tube measurements on water-saturated porous cylinders." In Poromechanics, 641–46. CRC Press, 2020. http://dx.doi.org/10.1201/9781003078487-108.

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Leopold, Estella B. "summer." In Stories From the Leopold Shack. Oxford University Press, 2016. http://dx.doi.org/10.1093/oso/9780190463229.003.0009.

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Summer was a time for transplanting prairie wildflowers. We knew that we wanted to restore prairie on the cornfield in front of the Shack. How did we know where we could get these prairie species? Of course there were no commercial sources at all. We had heard that prairie species were especially prolific along railroad tracks, because in those days the railroad frequently burned them to control brush. So we would stop there during different parts of the summer and find the prairie species in bloom (so we could identify them), or along an old road cut where we felt we could dig up chunks of sod with the species, put them in a tub in the car, and transport these to the Shack, to spud them in to the old corn field (our future prairie). This included prairie grasses, legumes, asters, and a whole variety of perennial species. And of course these can reproduce. This means that in those days (and to some extent now) there were “idle spots” along each side of the railroad tracks, as Dad observed, where the cow, plow, and mower are absent and a profusion of wild prairie herbs persist and bloom vigorously. Some species had huge deep roots, like the beautiful compass plant. Dad collected their seeds and built a little plot on the hill to plant these along with a mix of seeds of prairie grasses. This was an experiment. As mentioned, he did not water them, but they came up and did beautifully. So we knew how to promote such species on our prairie. (See chapter 7.) Over the years our prairie became more diverse, and more beautiful. According to the Land Institute of Salinas, Kansas, these native perennial prairie herb species typically grow very deep roots. Some extend downward ten to eighteen feet below the land surface! So it is no wonder the prairie vegetation is so stable and tenacious during drought; they have unusual adaptations to reach moisture and minerals at depth.

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Тези доповідей конференцій з теми "Water Shock Tube"

Maerefat, M., S. Fujikawa, T. Mizutani, and T. Akamatsu. "Experimental determination of condensation coefficient of water vapor by a shock-tube." In Current topics in shock waves 17th international symposium on shock waves and shock tubes Bethlehem, Pennsylvania (USA). AIP, 1990. http://dx.doi.org/10.1063/1.39473.

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R., Jishnu Chandran, and Abdusamad Salih. "WATER SHOCK TUBE SIMULATION WITH TAIT EQUATION OF STATE." In Proceedings of the 24th National and 2nd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2017). Connecticut: Begellhouse, 2018. http://dx.doi.org/10.1615/ihmtc-2017.3080.

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Hanson, Thomas, David Davidson, and Ronald Hanson. "Shock Tube Measurements of Water and n-Dodecane Droplet Evaporation behind Shock Waves." In 43rd AIAA Aerospace Sciences Meeting and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2005. http://dx.doi.org/10.2514/6.2005-350.

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Xu, Chundong, Tingwei Gu, and Deren Kong. "Finite Element Simulation of Water Shock Tube Used for Dynamic Calibration of Underwater Shock Wave Pressure Sensor." In 4th Workshop on Advanced Research and Technology in Industry (WARTIA 2018). Paris, France: Atlantis Press, 2018. http://dx.doi.org/10.2991/wartia-18.2018.15.

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AVDEEV, K. A., V. S. AKSENOV, I. A. SADYKOV, S. M. FROLOV, F. S. FROLOV, and I. O. SHAMSHIN. "TRANSMISSION OF SHOCK AND DETONATION WAVES INTO SEMICONFINED CHANNELS FILLED WITH LIQUID SATURATED BY GAS BUBBLES." In 13th International Colloquium on Pulsed and Continuous Detonations. TORUS PRESS, 2022. http://dx.doi.org/10.30826/icpcd13a19.

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Instead of applying mechanical propellers for producing thrust in water vehicles, patent [1] proposed using a pulsed detonation hydrojet consisting of a pulsed detonation tube inserted into a water guide. It was implied that the pulsed detonation tube could periodically detonate a fuel oxidizer mixture and generate shock waves pushing water out of the guide and producing thrust. For e¨ective shock-to-water momentum transfer, it was proposed to increase water compressibility by saturating it with bubbles of a chemically inert or reactive gas. It was found in [2] that the optimal gas content required for the maximum shock-to-water momentum transfer was about 20 %(vol.). However, experiments and calculations in [2] were made for a single shock interacting with bubbly water, thus implying that this ¦nding was valid for relatively low frequencies of shock generation. The shock-to-water momentum transfer is obviously dependent of operation frequency as shock waves propagating in a compressible medium tend to merge with each other and each preceding shock wave changes the gas content ahead of the succeeding shock wave. The objective of this work was to study the e¨ect of shock generation frequency on the §ow pattern in the water guide and on the e©ciency of shock-to-water momentum transfer. The frequency of shock-wave pulses entering a column of bubbly water was about ∼ 7 kHz which is characteristic of continuous-detonation combustors rather than pulsed detonation tubes. Interaction of the wave package in the form of the high-frequency sequence of three shock waves with bubbly water (see the ¦gure) and the shock-to-water momentum transfer were studied experimentally. The wave package was generated by detonating the gaseous stoichiometric propane oxygen mixture in a detonation tube with three tube branches of di¨erent lengths submerged in a column of bubbly water with free surface. In the experiments, the initial gas content in water was varied from 2 to 16 %(vol.) at the average diameter of air bubbles 3 4 mm and shock wave velocity in bubbly water in the range of 40 to 180 m/s. Experiments showed that the use of high-frequency shock-wave pulses in a hydrojet is pointless because of the arising interference of pulses which worsens the momentum transfer: on the one hand, the waves penetrating water quickly merge, thus feeding each other and increasing the bubbly water velocity, but on the other hand, the initial gas content for each successive shock wave decreases and, accordingly, the e©ciency of the momentum transfer decreases. The maximum operation frequency of the pulsed detonation tube in the hydrojet was shown to be limited by 50 60 Hz.

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Zhao, Pengduo, and Haojie Wang. "Study on Mechanical Properties of Water Mist Acting on Plane Shock Wave." In ASME 2020 39th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/omae2020-18335.

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Abstract The fine water mist has a significant effect in dealing with fire, gas explosion and other disasters of ships and offshore platforms. In this paper, the correlation formula of water mist acting on the plane shock wave front is derived. By combining with the correlation formula of shock wave tube flow parameters, the classical theory of solving shock wave tube flow parameters is improved, so that it can be applied to the action of water mist on plane shock wave without considering the amount of evaporation. The results of shock wave pressure and wave velocity calculated by the above theoretical formula are compared with experimental data, and the errors are all within 10%, thus verifying the applicability and reliability of the above formula. On this basis, the effects of water mist mass concentration and specific internal energy of droplet after wave on shock wave pressure and shock wave velocity are studied, and different heat absorption methods are compared. The results show that the greater the mass concentration of water mist is, the stronger the weakening effect on the shock wave, indicating that the fine water mist can weaken the strength of shock wave; and specific internal energy of droplet after wave is an important parameter that affects the degree to which the water mist weakens the shock wave. In the case of a small amount of evaporation, sensible heat absorption is the main mechanism for the water mist to weaken the shock wave.

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Leishear, Robert A. "Derivations for Hoop Stresses Due to Shock Waves in a Tube." In ASME 2007 Pressure Vessels and Piping Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/pvp2007-26722.

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Equations describing the hoop stresses in a pipe due to water hammer have been presented in the literature in a series of papers, and this paper discusses the complete derivation of the pertinent equations. The derivation considers the pipe wall response to a water hammer induced shock wave moving along the inner wall of the pipe. Factors such as fluid properties, pipe wall materials, pipe dimensions, and damping are considered. These factors are combined to present a single, albeit rather complicated, equation to describe the pipe wall vibrations and hoop stresses as a function of time. This equation is also compared to another theoretical prediction for hoop stresses, which is also derived herein. Specifically, the two theories predict different maximum stresses, and the differences between these predictions are graphically displayed.

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Wang, Xiao-Liang, and Motoyuki Itoh. "Rayleigh-Taylor Instability of a Shock Accelerated Gas Water Interface." In ASME 2001 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/imece2001/fed-24929.

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Abstract Rayleigh-Taylor instability at a gas-water interface has been investigated experimentally. Such instability was produced by accelerating a water column down a vertical circular tube employing shock wave impact. Accelerations from 50 to 100 times gravitational acceleration with fluid depths from 125 to 250 mm were studied. The resulting instability from small amplitude random perturbations was recorded and later analyzed using high-speed video images. Cavity formation was observed in the middle of the gas-water interface soon after the shock wave impact; bubbles and spikes then developed across the rest of the interfacial plane. Measurements of the growth coefficient of the bubbles and spikes show that they are nearly constant over different runs.

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Huang, Bo-Wun, Huang-Kuang Kung, and Jao-Hwa Kuang. "Dynamic Characteristics of a Mistuned Heat Exchanger in Cross-Flow." In ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/detc2007-34729.

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The dynamic behaviors of tubes of a heat exchanger are frequently affected by the existence of local flaw. These tubes are worn from the hot-cold fluid shock waves. This local defect may alter the tube dynamics and introduce mode localization in the periodically arranged tube array. The variation of the dynamic characteristics of a component cooling water heat exchanger with wear tubes in cross-flow is investigated in this study. Periodically coupled cooling tubes are used to approximate a heat exchanger. Each tube is considered to be coupled to adjacent tubes through the squeezed water film in the gaps. This work addresses the probability of mode localization is occurring in a heat exchanger in cross-flow. A dynamic model of the coupled tube bundle is proposed. The numerical results reveal that the local defect in a tube array may introduce the so-called mode localization phenomenon in a periodically coupled tube bundle.

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Igra, D., and K. Takayama. "Study of Two Cylindrical Water Columns Subjected to Planar Shock Wave Loading." In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-2044.

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Abstract Two water columns with identical initial diameters of 4.8 mm were placed 30 mm apart inside a shock tube test section and loaded by a shock wave of Mach number 1.47 in atmospheric air. The Weber and Reynolds numbers corresponding to these flow conditions are 6,900 and 112,000, respectively. Double exposure holographic interferometry was used to visualize the shock/water columns interaction. The process of the water columns deformation, displacement, acceleration was well visualized and hence the drag coefficient of shock loaded water columns was evaluated. The water column in the front behaved virtually the same as a single water column. However the displacement and acceleration of the rear water column was less significant than that of the front one. Hence its drag coefficient is less. These results show that the frontal water column has affected the flow field around the rear water column.

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Звіти організацій з теми "Water Shock Tube"

Schwer, Douglas, and K. Kailasanath. Blast Mitigation by Water Mist (2) Shock Wave Mitigation Using Glass Particles and Water Droplets in Shock Tubes. Fort Belvoir, VA: Defense Technical Information Center, January 2003. http://dx.doi.org/10.21236/ada411687.

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