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Статті в журналах з теми "Jet superchargers"
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Chekh, O., S. Sharapov, and V. Arsenyev. "Adiabated flowing streams in nozzles: influence of regular characteristics on relaxation steam formation." Refrigeration Engineering and Technology 55, no. 1 (February 10, 2019): 10–14. http://dx.doi.org/10.15673/ret.v55i1.1347.
Повний текст джерелаАнотація:
Two-phase nozzles, in which the phase transition process takes place, can work in jet superchargers for various purposes, including jet thermal pumps (steam-water injectors) and thermal compressors. In such schemes of thermal transformers, the ejector performs the function of a preliminary compression stage in order to reduce the load on the compression of the working substance in the main compressor. The use of fluxes of boiling liquid as energy-efficient working fluids is inhibited due to the lack of a reliable description of the mechanism of their flow. Finding the dependence of the steam content on the pressure and temperature at the nozzle exit will make it possible to determine the variant of the initial parameters at which the overproduction of steam will be greatest. It is also worth determining the change in the velocity factor, as well as the change in the thrust of the nozzle in the studied range of parameters, in order to find out whether the pressure at the nozzle outlet is a determining factor when choosing the design parameters of the nozzles. The article proposes to investigate the boiling streams in such nozzles by the method of mathematical modeling using a model that takes into account the relaxation nature of vaporization. The study used a compressible two-phase medium model, a kinetic model of evaporation / condensation. The model also takes into account the dynamic and mechanical equilibrium of the process of evaporation-condensation. The calculations were performed using an Ansys CFX commercial CFD product. The value of the mean square relative error of pressure measurement does not exceed 0,119%. The average discrepancy between the obtained data between the mathematical model and the field experiment does not exceed 3%.
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Al-Qutub, Amro M. "Energy consideration for designing supercharged ram jet engines." International Journal of Energy Research 32, no. 2 (2008): 107–15. http://dx.doi.org/10.1002/er.1337.
Повний текст джерела
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Edwards, Alexander, Michelle Hutchens, and Sonja Olhoft Rego. "The Pricing and Performance of Supercharged IPOs." Accounting Review 94, no. 4 (October 1, 2018): 245–73. http://dx.doi.org/10.2308/accr-52304.
Повний текст джерелаАнотація:
ABSTRACT This study examines a new form of initial public offerings, “supercharged” IPOs, where a firm-organized pre-IPO as a pass-through entity undergoes a series of transactions that steps-up the adjusted tax basis of the IPO firm's assets. This step-up imposes tax liabilities on pre-IPO owners, but also creates significant future tax benefits for the firm; the average anticipated deferred tax asset is $486 million ($13 per share) for our sample of supercharged IPO firms. Pursuant to tax receivable agreements, supercharged IPO firms pay a large portion of these tax benefits to pre-IPO owners as they are realized in the future. Future firm performance must be sufficiently strong for the IPO firm and the pre-IPO owners to realize the future tax benefits created by the supercharged transaction structure. We hypothesize and provide evidence of higher IPO offer prices and stronger future performance for supercharged IPO firms relative to traditional IPO firms. JEL Classifications: G14; G32; G34; H25.
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Lee, Kenneth, Edward Miguel, and Catherine Wolfram. "Does Household Electrification Supercharge Economic Development?" Journal of Economic Perspectives 34, no. 1 (February 1, 2020): 122–44. http://dx.doi.org/10.1257/jep.34.1.122.
Повний текст джерелаАнотація:
In recent years, electrification has reemerged as a key priority in low-income countries, with a particular focus on electrifying households. Yet the microeconomic literature examining the impacts of electrifying households on economic development has produced a set of conflicting results. Does household electrification lead to measurable gains in living standards or not? Focusing on grid electrification, we discuss how the divergent conclusions across the literature can be explained by differences in methods, interventions, potential for spillovers, and populations. We then use experimental data from Lee, Miguel, and Wolfram (2019) — a field experiment that connected randomly selected households to the grid in rural Kenya — to show that impacts can vary even across individuals in neighboring villages. Specifically, we show that households that were willing to pay more for a grid electrification may gain more from electrification compared to households that would only connect for free. We conclude that access to household electrification alone is not enough to drive meaningful gains in development outcomes. Instead, future initiatives may work better if paired with complementary inputs that allow people to do more with power.
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Rogovyi, Andrii, and Artem Neskorozhenyi. "Flow fields of a non-Newtonian fluid in vortex chamber pumps." Bulletin of Kharkov National Automobile and Highway University 1, no. 92 (March 4, 2021): 125. http://dx.doi.org/10.30977/bul.2219-5548.2021.92.1.125.
Повний текст джерелаАнотація:
Problem. Pumping different fluids by hydraulic transport is associated with fast wear of the pump contact surfaces. The fluids being pumped are often non-Newtonian. The use of jet pumps for pumping is impractical due to low efficiency. Vortex chamber pumps may have higher efficiency when pumping non-Newtonian fluids, however, their operation on such fluids has not yet been studied. The aim of this work is to study the characteristics of the flow fields of a non-Newtonian fluid using the example of a Bingham fluid in the vortex chamber pump. Methodology. Predicting pump energy performance and determining flow fields for highly viscous fluids using CFD simulations enables advanced jet pumps to handle non-Newtonian fluids. Results. Modeling was carried out based on the numerical solution of the RANS equations with the SST turbulence model. To ensure the operability of the vortex chamber pump when pumping non-Newtonian fluid, with known rheological parameters of the mixture, it is necessary to select the required supply pressure for the active flow, and also to consider the issue of diluting the liquid with water to reduce the mixture viscosity and achieve the specified values of the pumping energy parameters. Originality. The hypothesis that the vortex chamber supercharger can operate on a hypothetical ideal fluid has been confirmed. In this case, the performance indicators of such a supercharger improve and tend to ideal. With an increase in plastic viscosity, the volumetric flow rate of the pumped fluid decreases, and at high values of the viscosity, an active flow is ejected through the axial channels. Practical value. Researchers can use the theoretical results of this work to design new devices for pumping other Bingham fluids, such as oil paint, resins, varnishes, swamp soils, and many others.
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"CRUCIBLE A-286." Alloy Digest 51, no. 4 (April 1, 2002). http://dx.doi.org/10.31399/asm.ad.ss0851.
Повний текст джерелаАнотація:
Abstract Crucible A-286 is an age-hardenable austenitic Fe-Ni-Cr alloy designed for service up to 704 deg C (1300 deg F) on jobs requiring high strength and good corrosion resistance at the operating temperature. The alloy offers high ductility in notched sections. Crucible A-286 is used in jet engines and superchargers for various high-temperature components and is one of the few age-hardenable alloys used for bolting in the ASME Boiler and Pressure Vessel Code. This datasheet provides information on composition, physical properties, hardness, and tensile properties as well as creep. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SS-851. Producer or source: Crucible Specialty Metals.
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"BÖHLER T200." Alloy Digest 64, no. 4 (April 1, 2015). http://dx.doi.org/10.31399/asm.ad.ss1205.
Повний текст джерелаАнотація:
Abstract Böhler (or Boehler) T200 is an age-hardenable austenitic Fe-Ni-Cr alloy designed for service up to 704 deg C (1300 deg F) on jobs requiring high strength and good corrosion resistance at the operating temperature. The alloy offers high ductility in notched sections. The alloy is used in jet engines and superchargers for various high-temperature components and is one of the few age-hardenable alloys used for bolting in the ASME Boiler and Pressure Vessel Code. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as fracture toughness and creep. It also includes information on forming, heat treating, and machining. Filing Code: SS-1205. Producer or source: Böhler-Uddeholm Specialty Metals Inc..
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Kalaisselvane, A., G. S. Gunasegarane, N. Alagumurthy, and K. Palaniradja. "Experimental Investigations on Diesel Engine Forced Induction and Exhaust Gas Recirculation (EGR) Using Exhaust Gas Assisted Jet Compressor." Journal of Engineering for Gas Turbines and Power 136, no. 3 (November 14, 2013). http://dx.doi.org/10.1115/1.4025723.
Повний текст джерелаАнотація:
Even though the conventional method of supercharging and turbocharging of an internal combustion engine increases the engine specific power output, part of the shaft power developed by the engine is consumed by the superchargers. The control system that is present in both the chargers further complicates the system. This study proposes a novel method of forced induction in a diesel engine by using a jet compressor run by exhaust gas recirculation (EGR). This method apart from increasing the specific power output reduces the NOx formation by the engine due to forced induction. Performance analysis of the jet compressor using exhaust gas as the motive stream and atmospheric air as the propelled stream was carried out. Using the standard available code, the governing equations were solved numerically to get the optimum operating conditions such as exhaust gas pressure, temperature, and flow rate for a three cylinder diesel engine. The dimensions of the jet compressor were determined by solving the energy balance equations obtained from the constant rate momentum change method. Using the commercial software fluent, the performance optimization of jet compressor used for forced induction in a diesel engine was made for different percentage of EGR input and estimated the power output. From the results obtained, a performance map was drawn for the three cylinder diesel engine to get the optimum boost pressure and maximum entrainment ratio for a given percentage of exhaust gas recirculation and power output. Experiments were conducted on a three cylinder diesel engine fitted with a fabricated jet compressor with EGR used for forced induction application. Results obtained from the experiments were in good agreement with the numerical results obtained from fluent analysis.
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Pawlak, Grzegorz, Patryk Płochocki, Przemysław Simiński, and Tomasz Skrzek. "The experimental verification of the multi-fuel IC engine concept with the use of jet propellant-8 (JP-8) and its blends with pure rapeseed oil." International Journal of Energy and Environmental Engineering, June 11, 2021. http://dx.doi.org/10.1007/s40095-021-00398-w.
Повний текст джерелаАнотація:
AbstractThe paper presents some research results to recognize the possibility of realization of the idea of a multi-fuel IC engine. Future construction is planned as a flexible solution for military or special purpose transport means and emergency power generation. The proposed engine would utilize compression ignition mode for combustion of high reactive fuels (JP-8, diesel oil, etc.) or spark ignition mode for gasoline or other low reactive fuels. Practical implementation of the idea requires that highly reactive fuels be burned efficiently at a low compression ratio suitable for both engine modes. For the test diesel oil, JP-8 and its blends with pure rapeseed oil were chosen as easily accessible fuels. The experiment was carried out on naturally aspirated and supercharged AVL research engine with a common rail system and compression ratio CR = 12. The elaborated, unified injection strategy that synchronized the main dose injection timing with the start of the second stage of homogeneous mixture combustion was checked in practice. The proposed injection strategy applied for CI engine with the low compression ratio enabled efficient combustion and comparable, relatively high engine performance for all tested fuels.
Дисертації з теми "Jet superchargers"
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Роговий, Андрій Сергійович. "Розробка теорії та методів розрахунку вихорокамерних нагнітачів". Thesis, Харківський національний автомобільно-дорожній університет, 2017. http://repository.kpi.kharkov.ua/handle/KhPI-Press/29275.
Повний текст джерелаАнотація:
Дисертація на здобуття наукового ступеня доктора технічних наук за спеціальністю 05.05.17 – гідравлічні машини та гідропневмоагрегати. – Національний технічний університет "Харківський політехнічний інститут", Харків, 2017.
У дисертаційній роботі розв'язано науково-практичну проблему підвищення техніко-економічної ефективності гідравлічних і пневматичних нагнітачів, що перекачують рідини в несприятливих умовах експлуатації або гетерогенні середовища, за рахунок розробки і використання принципово нового типу струминних нагнітачів відцентрової дії. Їх конструкція не містить рухомих механічних частин, а також ущільнень, завдяки чому вони мають високі показники надійності і довговічності притаманні струминній техніці. Концепція нагнітачів базується на новому для струминних нагнітачів принципі – поєднанні позитивних якостей процесів у відцентрових і струминних нагнітачах та особливостях гідродинаміки обмежених обертових потоків. Використання вихорокамерних нагнітачів дозволяє підвищити енергоефективність гідравлічних і пневматичних систем, збільшити обсяг переміщуваних вантажів в гідравлічному і пневматичному трубопровідному транспорті, підвищити продуктивність праці і якість продукції, знизити її собівартість, поліпшити умови роботи. Розроблені нагнітачі є більш енергоефективними, внаслідок передачі енергії в полі відцентрової сили. Таким чином, створено наукові основи проектування струминних вихорокамерних нагнітачів для перекачування середовищ різних агрегатних станів.Thesis for degree of Doctor of Science in Technique for speciality 05.05.17 – hydraulic machines and hydropneumatic units. – National Technical University "Kharkiv Polytechnical Institute", Kharkiv, 2017. In dissertational work the scientifically-practical problem of technical and economic efficiency increase of the hydraulic and pneumatic superchargers which are pumping over liquids in adverse service conditions or heterogeneous environments, at the expense of designing and use of essentially new type of jet superchargers of centrifugal action is solved. Their design does not contain mobile mechanical parts, and also sealing due to the fact that they have high indicators of reliability and durability inherent in jet technics. Conception of superchargers is based on a principle new to jet superchargers – unification of processes properties in centrifugal and jet superchargers and hydrodynamics features of the limited rotating streams. Use of vortex chamber superchargers allows to raise power efficiency of hydraulic and pneumatic systems, to increase volume of moved cargoes in hydraulic and pneumatic pipeline transport, to raise productivity of work and quality of production, to lower its cost price, to improve working conditions. The developed superchargers are more power effective, owing to transmission of energy in the field of centrifugal force. Thus, scientific bases of designing jet vortex chamber superchargers for transportation environments of different aggregation states are created.
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Роговий, Андрій Сергійович. "Розробка теорії та методів розрахунку вихорокамерних нагнітачів". Thesis, НТУ "ХПІ", 2017. http://repository.kpi.kharkov.ua/handle/KhPI-Press/29269.
Повний текст джерелаАнотація:
Дисертація на здобуття наукового ступеня доктора технічних наук за спеціальністю 05.05.17 – гідравлічні машини та гідропневмоагрегати. – Національний технічний університет "Харківський політехнічний інститут", Харків, 2017.
У дисертаційній роботі розв'язано науково-практичну проблему підвищення техніко-економічної ефективності гідравлічних і пневматичних нагнітачів, що перекачують рідини в несприятливих умовах експлуатації або гетерогенні середовища, за рахунок розробки і використання принципово нового типу струминних нагнітачів відцентрової дії. Їх конструкція не містить рухомих механічних частин, а також ущільнень, завдяки чому вони мають високі показники надійності і довговічності притаманні струминній техніці. Концепція нагнітачів базується на новому для струминних нагнітачів принципі – поєднанні позитивних якостей процесів у відцентрових і струминних нагнітачах та особливостях гідродинаміки обмежених обертових потоків. Використання вихорокамерних нагнітачів дозволяє підвищити енергоефективність гідравлічних і пневматичних систем, збільшити обсяг переміщуваних вантажів в гідравлічному і пневматичному трубопровідному транспорті, підвищити продуктивність праці і якість продукції, знизити її собівартість, поліпшити умови роботи. Розроблені нагнітачі є більш енергоефективними, внаслідок передачі енергії в полі відцентрової сили. Таким чином, створено наукові основи проектування струминних вихорокамерних нагнітачів для перекачування середовищ різних агрегатних станів.Thesis for degree of Doctor of Science in Technique for speciality 05.05.17 – hydraulic machines and hydropneumatic units. – National Technical University "Kharkiv Polytechnical Institute", Kharkiv, 2017. In dissertational work the scientifically-practical problem of technical and economic efficiency increase of the hydraulic and pneumatic superchargers which are pumping over liquids in adverse service conditions or heterogeneous environments, at the expense of designing and use of essentially new type of jet superchargers of centrifugal action is solved. Their design does not contain mobile mechanical parts, and also sealing due to the fact that they have high indicators of reliability and durability inherent in jet technics. Conception of superchargers is based on a principle new to jet superchargers – unification of processes properties in centrifugal and jet superchargers and hydrodynamics features of the limited rotating streams. Use of vortex chamber superchargers allows to raise power efficiency of hydraulic and pneumatic systems, to increase volume of moved cargoes in hydraulic and pneumatic pipeline transport, to raise productivity of work and quality of production, to lower its cost price, to improve working conditions. The developed superchargers are more power effective, owing to transmission of energy in the field of centrifugal force. Thus, scientific bases of designing jet vortex chamber superchargers for transportation environments of different aggregation states are created.
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Jelínek, Petr. "Návrh sacího traktu s variabilní délkou pro experimentální zážehový motor." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-254363.
Повний текст джерелаАнотація:
This thesis discusses of the intake tract four-stroke ignition internal combustion engine and the filling efficiency and opportunities to increase this efficiency and consequently to optimize the course of torque and power at the specified serial engine. 3D model is the last point of this thesis.
Частини книг з теми "Jet superchargers"
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Kollmann, Karl, Calum E. Douglas, and S. Can Gülen. "Turbojet Engines." In Turbo/Supercharger Compressors and Turbines for Aircraft Propulsion in WWII: Theory, History and Practice—Guidance from the Past for Modern Engineers and Students, 283–314. ASME, 2021. http://dx.doi.org/10.1115/1.884676_ch11.
Повний текст джерелаАнотація:
Dr. Kollmann (and his colleagues) were keenly aware that the jet engine was the powerplant of future. They clearly stated this when interrogated by the British intelligence agents in June 1945 (from Report POW/ENG/6, Evaluation Report No. 539, 16 Apr 46). They thought that the piston engine would still be used for some time to come for transport purposes, but they did not think that it had much application in war time. They anticipated that the jet engines would constitute the bulk of the fleet, to the tune of 60-70%. However, they did not foresee a full demise of piston engines.
Тези доповідей конференцій з теми "Jet superchargers"
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Mahendra, Pranay, and Michael G. Olsen. "Unsteady Velocity Field Measurements of Outlet Flow in an Automotive Supercharger." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-14893.
Повний текст джерелаАнотація:
Recently the automotive industry has been using superchargers to boost the power generated by the engine, but the noise generated by these superchargers is of great concern. The noise generated during the working of the supercharger is primarily a fluid mechanics phenomenon. Particle Image Velocimetry (PIV) was used to study air flow characteristics of a positive displacement supercharger with an emphasis on gaining insights into strategies for noise reduction. PIV was used to measure the instantaneous and ensemble-averaged velocity fields of the flow at the outlet of the supercharger as a function of blade position, allowing for visualization of the flow as it leave the blades. The preliminary results show that the flow exits the supercharger as a high speed jet at the end closer to the pulley end, and the flow varies with the change in blade position.
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Cyrus, John D., David J. Bents, and David M. Overholt. "A Supercharged Turbojet for High Altitude Atmospheric Science Investigations." In ASME 1999 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/99-gt-106.
Повний текст джерелаАнотація:
A study was conducted for NASA Dryden Flight Research Center to investigate the viability of developing an externally powered zero stage booster fan to boost the altitude performance of a high altitude turbojet from 80 kft. to over 90 kft., in order to realize a very high altitude subsonic remotely piloted aircraft (RPA) capable of atmospheric science missions. A modified non-airbreathing torpedo engine powers the booster fan. The powered fan is grafted onto an airbreathing turbojet (the General Electric YJ97 jet engine) and is used to supercharge the engine (boost inlet pressure and airflow) at altitudes above its original design limits. The inlet boost keeps the engine operating and delivering thrust, at subsonic speeds, to mission altitudes over 95,000 ft. If this modified engine were grafted back into the air vehicle it was originally designed for (the Viet Nam era AQM-91A Compass Arrow) the modifications would enable the vehicle to increase its maximum altitude from 80,000 ft to over 88,000 ft for periods up to 45 min. With some additional wing area, the aircraft, which is in the 5000 lbm TOGW class, could carry a 500 lbm payload to altitudes over 92,000 kft with an operational radius over 1500 NMi. This study examined a number of candidate component arrangements to realize this fan-boosted propulsion system. Performance was estimated for the subsystem components, the resulting propulsion systems, and the associated RPA. In addition, the study estimated the time and cost to demonstrate/validate this concept in a full-scale propulsion system wind tunnel test program. This paper describes the concept, summarizes the concept selection efforts and performance analysis conducted during the study, and explains the rationale behind this unusual approach. A description of the proposed development and test program, and the cost estimate, lies beyond the scope of this paper.
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Nalim, M. Razi, and Kerem Pekkan. "A Review of Rotary Pressure-Gain Combustion Systems for Gas Turbine Applications." In ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/gt2003-38349.
Повний текст джерелаАнотація:
In the last two decades, jet engines and gas turbines attempting constant-volume combustion without positive–displacement mechanisms have regained attention, mainly due to their theoretical high efficiency, potential low emissions, and compact design features. The idea can be traced back to experiments in the 1930’s and production of devices like the V1 missile motor and the Comprex® supercharger. Both for power generation and for aerospace applications, specific hardware and ingenious cycle designs are being developed to address known technological challenges. Different thermodynamic approaches and design methods are proposed to predict the performance potential of these periodic-unsteady wave machines. There have been experimental studies and successfully operated test-rigs that were sometimes shelved due to immediate economic concerns. These “lost” previous studies and experiences are worth reviewing amidst the increased attention to pulse detonation engine and wave-rotor applications proposed for gas turbine cycles by engine makers and government laboratories. In this review paper, our aim is to summarize the status and important efforts in this field. Recent research is highlighted by specific research groups worldwide attempting diverse applications. A compilation of promising applications is presented, to help focus efforts on future work needed.
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Bai, Jianhua, Fahao Yu, Zhaoping Jiang, Yue Li, Baobing Shang, and Maosen Yan. "First Attempt of Injection-Production Integrated Technology for Steam Stimulation in Bohai Bay, China." In International Petroleum Technology Conference. IPTC, 2021. http://dx.doi.org/10.2523/iptc-21185-ms.
Повний текст джерелаАнотація:
Abstract There is abundant heavy oil resource in Bohai Oilfield and steam stimulation has proven an effective method through several field pilots. Till now, all steam stimulation is conducted by two-trips string for steam injection and oil production individually. That is, when the process of steam injection, soaking and blowout is finished, an oil production string will replace the downhole string through workover operation. According to statistics, the operating charge in one huff-and-puff cycle is more than 2.5 million Yuan. Besides, workover operation takes more than 26 days and results in about 1000 m3 kill fluid leak, which greatly reduce the thermal recovery effect. Considering the drawbacks of two-trips string technology, a new injection-production integrated technology by jet pump, namely single-trip string realizing steam injection and oil production, is developed, which includes downhole string system and surface technological process system. The downhole string provides passages for steam injection and oil production. The temperature and pressure resistance of string system could reach as high as 350°C and 35MPa, respectively, which can adapt to the high temperature environment during steam injecting. The surface technological process system can separate 279m3/d producing fluid and supercharge the power fluid as high as 25MPa, which meet the needs of thermal well production. The new technology tested in X well. More than 6000 m3 steam with 356°C temperature and 16MPa pressure was injected. The downhole string system and Christmas tree withstood the HTHP test and kept in good condition. During oil production, the surface technological process ran run steadily. The pressure of plunger pump was up to 20MPa and more than 120m3 produced fluids were separated by the separator. Compared with two-trips string technology, the new technology saved 2 million Yuan and 21 operating days. Besides, no kill fluid leaked, which improves thermal recovery effect. This is the first time that injection-production integrated technology for steam stimulation is developed and put into field trial. The favorable application result indicates that this technology will promote the high-efficient exploitation of heavy oil in Bohai Bay.