单边膨胀喷管气动和红外辐射特性数值研究  

Numerical study on aerodynamic and infrared radiation characteristics of single expansion ramp nozzle

作　　者：张少丽[1] 单勇[1] 张靖周[1] 

机构地区：[1]南京航空航天大学能源与动力学院,南京210016

出　　处：《航空动力学报》2011年第7期1502-1508,共7页Journal of Aerospace Power

基　　金：南京航空航天大学基本科研业务费专向科研项目(NS2010036);航空科学基金(2010ZB52019)

摘　　要：通过计算流体动力学/红外辐射(CFD/IR)数值模拟的方法,研究了单膨胀边倾角、喉道高度、侧壁长度和落压比(NPR)对单边膨胀喷管(SERN)气动性能和红外辐射特性的影响.研究结果表明:轴向推力系数随着单膨胀边倾斜角度增大而急剧减小,推力矢量角随着单膨胀边倾斜角度增大而增大;随着喷管落压比的增大,轴向推力系数先增大后减小,推力矢量角减小;随着喷管侧壁长度的增加,轴向推力系数可略微提高;单膨胀边对尾焰和喷管内壁有显著的遮挡作用,喷管下方的整体红外辐射仅为上方的10%左右;随着喷管落压比的增加,喷管上方的整体红外辐射降低.Based on computational fluid dynamics/infrared radiation （CFD/IR） numeri cal calculations, the effects of different structures and nozzle pressure ratio （NPR） on the aerodynamic and infrared radiation characteristics were revealed for a single expansion ramp nozzle （SERN）. The results show that： with increase of ramp angle, the thrust-vector angle is enlarged and axial thrust coefficient is decreased rapidly% with increase of nozzle pressure ratio, the axial thrust coefficient increases firstly and then decreases, meantime, the thrust-vector angle reduces~ as the length of sidewall increases, axial thrust coefficient im- proves slightly. The ramp of nozzle can significantly shield the infrared radiation of plume and inner-wall of nozzle. The radiation detected from underside of nozzle is only 10% of that from upside of nozzle. With increase of nozzle pressure ratio, the infrared radiation from underside of nozzle is reduced.

关 键 词：红外抑制 单边膨胀喷管 气动性能 红外辐射 数值模拟 

分 类 号：V231[航空宇航科学与技术—航空宇航推进理论与工程]