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Influence of air pressure on the performance of plasma synthetic jet actuator 被引量:1
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作者 李洋 贾敏 +4 位作者 吴云 李应红 宗豪华 宋慧敏 梁华 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第9期429-436,共8页
Plasma synthetic jet actuator(PSJA) has a wide application prospect in the high-speed flow control field for its high jet velocity.In this paper,the influence of the air pressure on the performance of a two-electrod... Plasma synthetic jet actuator(PSJA) has a wide application prospect in the high-speed flow control field for its high jet velocity.In this paper,the influence of the air pressure on the performance of a two-electrode PSJA is investigated by the schlieren method in a large range from 7 k Pa to 100 k Pa.The energy consumed by the PSJA is roughly the same for all the pressure levels.Traces of the precursor shock wave velocity and the jet front velocity vary a lot for different pressures.The precursor shock wave velocity first decreases gradually and then remains at 345 m/s as the air pressure increases.The peak jet front velocity always appears at the first appearance of a jet,and it decreases gradually with the increase of the air pressure.A maximum precursor shock wave velocity of 520 m/s and a maximum jet front velocity of 440 m/s are observed at the pressure of 7 k Pa.The averaged jet velocity in one period ranges from 44 m/s to 54 m/s for all air pressures,and it drops with the rising of the air pressure.High velocities of the precursor shock wave and the jet front indicate that this type of PSJA can still be used to influence the high-speed flow field at 7 k Pa. 展开更多
关键词 plasma synthetic jet actuator air pressure performance schlieren method
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Penetration performance of W/Cu double-layer shaped charge liners 被引量:2
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作者 Wen-Jian Dong Jin-Xu Liu +3 位作者 Xing-Wang Cheng Shu-Kui Li Qing-He Zou Wen-Qi Guo 《Rare Metals》 SCIE EI CAS CSCD 2016年第2期184-191,共8页
Two kinds of W/Cu double-layer shaped charge liner(SCL) were prepared by chemical vapor deposition(CVD) combined with electroforming technique: A SCL with W inner layer and Cu outer layer, B SCL with Cu inner lay... Two kinds of W/Cu double-layer shaped charge liner(SCL) were prepared by chemical vapor deposition(CVD) combined with electroforming technique: A SCL with W inner layer and Cu outer layer, B SCL with Cu inner layer and W outer layer. The penetration properties of A and B SCLs were researched. The results show that the two SCLs can form continuous jet and the tip velocities of A and B jets are 7.4 and 6.3 km s^(-1), respectively. The kinetic energy density(5.3 9 1011 J m-3) of A jet tip increases by 194.4 %compared with that(1.8 9 1011 J m-3) of B jet tip. B jet,however, exhibits deeper penetration depth at the same experimental conditions. The chemical component and microstructure of the area nearby the ballistic perforation were researched. Component analysis shows that both the jets are formed only from inner layer metal. Microstructure analysis shows that martensite and intermetallic form around ballistic perforation penetrated by A SCL due to the intensive interaction between W jet and steel target. The two kinds of newly formed ultrahard phases also hinder the jet from penetrating target further. As a result of relatively alleviative interaction between Cu jet and target, only solid solution rather than ultrahard phases forms around ballistic perforation penetrated by B SCL. 展开更多
关键词 Shaped charge liner Jet Penetration performance Chemical vapor deposition Electroforming technique
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Jet CAT P80 Thermal Analyses and Performance Assessment Using Different Fuels Types
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作者 Grigore CICAN Adina TOMA +1 位作者 Cristian PUSCASU Razvan CATANA 《Journal of Thermal Science》 SCIE EI CAS CSCD 2018年第4期389-393,共5页
The micro gas turbine propulsion systems represent a good choice for the unmanned aerial vehicles(UAVs). The present work monitors the engine parameters, correlating them with other important engine instrumentation da... The micro gas turbine propulsion systems represent a good choice for the unmanned aerial vehicles(UAVs). The present work monitors the engine parameters, correlating them with other important engine instrumentation data. The aim of this research was to study the operation of the Jet CAT using various types of fuels under various operating conditions: normal acceleration and sudden acceleration. The measured parameters were monitored under different conditions:(A) Engine operation at two different ambient temperatures – outdoor at 0oC and inside at 19oC; and(B) Using 4 fuel types: kerosene, diesel fuel, kerosene with 5% gasoline and kerosene with 10% gasoline. The relevance of this work is given by the fact that a detailed analysis is performed for the idle regime. The paper will present the detailed test plan used and the most relevant charts with the obtained results for: start time, force, temperature before turbine, fuel flow, depending on micro turbo engine speed. 展开更多
关键词 Jet CAT P80 fuel performance testing thermal analysis
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THE PERFORMANCES OF HIGH PRESSURE JET OF PURE WATER AND POLYMER SOLUTION WITH CONICAL NOZZLE
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作者 LIAO QIDIAN ZHONG SHENGYU +1 位作者 ZHAO XUEDUAN ZHU YONG, Shanghai Institute of Mechanical Engineeing, Shanghai, P.R.China 《Journal of Hydrodynamics》 SCIE EI CSCD 1989年第1期61-71,共11页
In this paper, the effects of polymer additives and nozzle shape on the proper- ties of high pressure water jet discharging into the air are investigated by theory and experiments. Criteria of judging the jet quality ... In this paper, the effects of polymer additives and nozzle shape on the proper- ties of high pressure water jet discharging into the air are investigated by theory and experiments. Criteria of judging the jet quality are put forward. And, a method that can be used in analysing the fluid flow within the nozzle is developed. Then, the calculated results are compared with the experiments that we carried out; it is shown that the degree of agreement between the two is good. At last, the mechanism to improve on the jet quality with polymer additives is discussed. 展开更多
关键词 LENGTH THE performanceS OF HIGH PRESSURE JET OF PURE WATER AND POLYMER SOLUTION WITH CONICAL NOZZLE FLOW very JET
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