单边膨胀喷管气动和红外辐射特性数值研究

张少丽; 单勇; 张靖周

单边膨胀喷管气动和红外辐射特性数值研究

南京航空航天大学能源与动力学院, 南京 210016

基金项目: 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)

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出版历程
- 收稿日期: 2010-06-25
- 修回日期: 2010-10-18
- 刊出日期: 2011-07-28

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

College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China

摘要

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.
- 红外抑制 /
- 单边膨胀喷管 /
- 气动性能 /
- 红外辐射 /
- 数值模拟
Abstract: Based on computational fluid dynamics/infrared radiation (CFD/IR) numerical 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 improves 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.
- infrared suppression /
- single expansion ramp nozzle (SERN) /
- pneumatic performances /
- infrared radiation /
- numerical simulation

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参考文献(14)

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