塞式喷管效率高度特性分析  

Altitude Characteristics Analysis of Plug Nozzle

作　　者：琚春光[1] 刘宇[1] 覃粒子[1] 

机构地区：[1]北京航空航天大学宇航学院,北京100083

出　　处：《航空动力学报》2005年第4期693-697,共5页Journal of Aerospace Power

基　　金：国家"863"资助(863-2-1-3-1)

摘　　要：通过理论分析,结合塞式喷管具有高度补偿特性的特点,根据气流流动的情况,将塞式喷管的推力分为两部分,建立了两个不同的塞锥表面压力分布的数学模型,来分析塞式喷管发动机效率的高度特性非单调性变化的规律以及塞锥表面压力分布对其的影响。结果表明,在高的环境压强下工作时,由塞式喷管的高度补偿能力所获得的推力是引起效率高度特性曲线非单调变化的原因;在低的环境压强下工作时,由于塞锥的截短,效率高度特性曲线在设计点之前达到最大值。According to the altitude compensation capability of the plug nozzle and the actual flow characteristics on plug surface ,the thrust of plug nozzle was divided into two parts. Two different models of the pressure distribution on plug surface were established to analyze the change of nozzle efficiency with altitude and the effect of pressure distribution on the plug surface. Results show that the thrust aroused from the altitude compensation capability is the cause of the non-monotone variation of nozzle efficiencymaximum of the thrust efficiency occurs before the with altitude at high ambient pressure; thedesign point at low ambient pressure.

关 键 词：航空 航天推进系统 火箭发动机 塞式喷管 高度特性 效率 

分 类 号：V430[航空宇航科学与技术—航空宇航推进理论与工程]