乙烯和汽油多循环脉冲爆震发动机起爆特性比较
Comparative ignition characteristics of ethylene and gasolene in multi-cycle pulse detonation engine
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摘要: 为了研究脉冲爆震发动机(PDE)结构对其工作性能的影响,在内径为40mm、长为1050mm的气动阀式脉冲爆震发动机样机上,进行了气态乙烯/空气和液态汽油/空气的多循环起爆特性试验研究.研究结果表明:在25,30Hz和40Hz下都能在乙烯/空气中成功触发爆震波,40Hz下产生C-J(Chapman-Jouguet)爆震波,传播速度为1724m/s(低于C-J爆震波速度理论值1832.45m/s的5.6%),峰值压力为3.01MPa(高于C-J爆震波压力理论值2.79MPa的7.88%).在相同结构下,汽油/空气未能完成由缓燃向爆震转变的过程.通过对比两种燃料下的试验结果发现:相对于气态燃料,液态燃料受其蒸发过程的影响,在爆震管内的火焰加速缓慢,需要更多的强化燃烧装置来加速火焰,带来的总压损失也更大.因此,对于液态燃料改善雾化和蒸发,提高可爆混气的质量是其实现低阻起爆的关键.Abstract: To investigate the influence of the structure of multi-cycle pulse detonation engine(PDE) on its operation performance,experiments of ethylene-air and gasoline-air mixtures initiation process in the aero-valve PDE of 1050mm length and 40mm inner diameter were performed.The results show that the detonation wave can be successfully initiated in the ethylene-air with frequency of 25,30Hz and 40Hz,and C-J(Chapman-Jouguet) detonation wave can be achieved at the frequency of 40Hz with detonation wave propagation velocity of 1724m/s(less 5.6% than the C-J detonation wave velocity theoretical value 1832.45m/s) and peak wave pressure of 3.01MPa(higher 7.88% than the C-J detonation wave pressure theoretical value 2.79MPa).While the deflagration to detonation transition failed to complete in gasolene-air.By comparison of the two results,it was found that the evaporation process dominated the initiation process in liquid fuels,thus slowering the flame acceleration process in the detonation tube.More novel and optimized-designed reinforced-combustion devices for accelerating the flame should be developed,which may cause higher total pressure loss.Thus,atomization and evaporation to improve the quality of the mixture is a key technology for detonation in the liquid fuel.
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[1] Brophy C M,Sinibaldi J O,Netzer,et al.Operation of a JP-10/air pulse detonation engine [R].AIAA 2000-3591,2000. [2] Brophy C M,Netzer D W,Dorester D.Detonation studies of JP10/air with oxygen and air for pulse detonation engine development [R].AIAA 98-4003,1998. [3] Brophy C M,Sinibaldi J O,Damphousse P.Initiator performance for liquid-fueled pulse detonation engine [R].AIAA 2002-0472,2002. [4] 范育新.大管径气动阀式两相脉冲爆震发动机几个关键技术研究[D].南京:南京航空航天大学,2005. FAN Yuxin.Investigation on several key technologies of two-phase valveless large-scale pulse detonation engine [D].Nanjing:Nanjing University of Aeronautics and Astronautics,2005.(in Chinese) [5] 张义宁,王家骅,张靖周.频率30~50Hz两相脉冲爆震发动机研究[J].航空学报,2006,27(6):993-997. ZHANG Yining,WANG Jiahua,ZHANG Jingzhou.Investigation on two phase pulse detonation engine at the frequency 30—50Hz[J].Acta Aeronautica et Astronautica Sinica,2006,27(6):993-997.(in Chinese) [6] 张义宁.提高两相脉冲爆震发动机工作频率的研究[D].南京:南京航空航天大学,2007. ZHANG Yining.Investigation on increasing operating frequency of two-phase pulse detonation engine [D].Nanjing:Nanjing University of Aeronautics and Astronautics,2007.(in Chinese) [7] 宫继双,范育新,王家骅.两相多循环扇形PDE试验研究[J].航空动力学报,2008,23(11):2068-2074. GONG Jishuang,FAN Yuxin,WANG Jiahua.Experimental investigation on two-phase and mutli-cycle sector-PDE [J].Journal of Aerospace Power,2008,23(11):2068-2074. (in Chinese) [8] Danaher T J.Characterization of ethylene/JP-10 fuel injection profiles for a valveless pulse detonation Engine [D].California,US:Naval Postgraduate School,2007. [9] Sexton N G.Detonability of hydrocarbon-air mixtures using combustion enhancing geometries for pulse detonation engines [D].California,US:Naval Postgraduate School,2001. [10] Hackard Jr C N.Ignition characteristics for transient plasma ignition of ethylene-air and JP-10-Air mixtures in a pulse detonation engine [D].California,US:Naval Postgraduate School,2007. [11] LI Chiping,Kailasanath K.Detonation initiation in pulse detonation engines [R].AIAA 2003-1170,2003. [12] Hutcheson P,Brophy C,Sinibaldi J.Investigation of flow field properties on detonation initiation [R].AIAA 2006-5099,2006. [13] Shimo M,Heister S.Multicyclic detonation initiation studies in valveless pulsed detonation combustors [R].AIAA 2006-4308,2006. [14] Roya G D,Frolovb S M,Borisov A A,et al.Pulse detonation propulsion:challenges,current status,and future perspective[J].Progress in Energy and Combustion Science,2004,30(6):545-672. [15] 严传俊,范玮.脉冲爆震发动机原理及关键技术[M].西北工业大学出版社,2006.
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