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Experimental Investigation of Nozzle Effects on Thrust and Inlet Pressure of an air-breathing pulse detonation engine

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Chinese Journal of Aeronautics 2012年第3期25卷 381-387页

作者： CHEN Wenjuan FAN Wei ZHANG Qun PENG Changxin YUAN Cheng YAN Chuanjun School of Power and Energy Northwestern Polytechnical UniversityXi'an 710072China

Nozzle effects on thrust and inlet pressure of a multi-cycle air-breathing pulse detonation engine （APDE） are investigated experimentally. An APDE with 68 mm in diameter and 2 050 mm in length is operated using gasoline/air mixture. Straight nozzle, converging nozzle, converging-diverging nozzle and diverging nozzle are tested. The results show that thrust augmentation of converging-diverging nozzle, diverging nozzle or straight nozzle is better than that of converging nozzle on the whole. Thrust augmentation of straight nozzle is worse than those of converging-diverging nozzle and diverging nozzle. Thrust augmentations of diverging nozzle with larger expansion ratio and converging-diverging nozzle with larger throat area range from 20% to 40% on tested frequencies and are better than those of congeneric other nozzles respectively. Nozzle effects on inlet pressure are also researched. At each frequency it is indicated that filling pressures and average peak pressures of inlet with diverging nozzle and converging-diverging nozzle with large throat cross section area are higher than those with straight nozzle and converging nozzle Pressures near thrust wall increase in an increase order from without nozzle, with diverging nozzle, straight nozzle and converging-diverging nozzle to converging nozzle.

关键词： nozzle effect thrust inlet pressure air-breathing pulse detonation engine

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Effect of inlet-valve structures on thrust of airbreathing pulse detonation engines

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Propulsion and Power Research 2021年第4期10卷 332-346页

作者： Wenjuan Chen Wei Fan Feiteng Luo Gaohu Tang Yaosong Long School of Aerospace engineering Huazhong University of Science and TechnologyWuhan430074China School of Power and Energy Northwestern Polytechnical UniversityXi’an710072China

Experimental studies were conducted in order to improve the understanding of the thrust generation and the pressure/flame reverse propagation of the air-breathing pulse detonation engines(APDEs)with self-designed inlets and valves *** present experimental research utilized a gasoline/air APDE(with 68 mm inner-diameter,2050 mm length and maximum operating frequency not less than 40 Hz which was as a benchmark structure)at different operating frequencies,with freestream air inflow of 1.1 atm and 0℃.The theoretical equivalence ratio of gasoline/air was *** kinds of inlets with centerbody or without were considered and combined with two kinds of self-designed valves(the elastic-valve and the convergent aero-valve)specially designed for comparative *** the test,the inflow parameters,the pressure along the longitudinal direction inside the engine and the thrust force were measured for the APDE operating characteristic analysis,including the detonation combustion,the aerodynamic drag,the pressure/flame reverse propagation and the thrust *** research results indicate that:The inlet centerbody does not increase drag but plays a positive effect on airflow stability and operation *** elastic-valve and the convergent aero-valve,though increase the inlet aerodynamic drag,have obvious effects on suppressing the detonation wave and pressure forward propagation,resulting in effective thrust *** of the convergent aero-valve are the best when the flow choked,while the effects of elastic-valve are better and continuously stable in a wider range of *** wmaximum nondimensional thrust increases with the elastic-valve is reached about 1.12 at the frequency of 8-9 Hz,and about 0.97 with the convergent aero-valve at the frequency of 7 *** maximum fuel specific impulse is 2514.6 s when using the convergent *** this study provides technical reserve for the APDE optimization design.

关键词： air-breathing pulse detonation engine Elastic-valve Convergent aero-valve Thrust augmentation Pressure/flame reverse propagation

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