球面收敛二元矢量喷管气动及红外特性研究:模拟高空状态

Investigation on aerodynamic and infrared performance of a spherical convergent two-dimensional vectoring nozzle:simulating high altitude status

针对高空状态下球面收敛二元矢量喷管排气系统,通过数值模拟研究了喷管俯仰偏转角对排气系统气动和红外辐射特性的影响,并与地面状态进行了对比分析.在该研究参数范围内,研究结果表明:在俯仰偏转角为20°范围内,俯仰偏转对排气系统推力系数和总压恢复系数的影响微弱,气动推力矢量角与俯仰偏转角几乎相等,高空状态下,喷管的推力系数和总压恢复系数下降0.5%与1.1%;热喷流峰值红外辐射强度仅为地面状态的12%~24%,排气系统的总体红外辐射强度峰值与地面状态下的比值峰值在0.35~0.45之间;随着下俯仰偏转角的增加,排气系统红外辐射峰值呈现下降的趋势.

A numerical investigation was performed to study the effects of pitching angle on the aerodynamic and infrared performances of a spherical convergent two-dimensional vectoring nozzle under high attitude status. In the present research, the comparison with the ground status simulation was also taken into consideration. The results show that the pitch deflection has a very weak impact on the thrust coefficient and total pressure recovery coeffi- cient of exhaust system under the pitching angle ranging from 0 degree to 20 degree. The aerodynamic vectoring angle is nearly the same as the geometric vectoring angle. The thrust coefficient and total pressure recovery coefficient of exhaust nozzle under high attitude status decrease 0.50 % and 1.1%, respectively. As the total infrared radiation of exhaust system in 3-5 μm band is concerned, the peak infrared radiation intensity of plume under high attitude status is only 12-24 percent of the corresponding values under ground status. For the total infrared radiation of exhaust system, the ratio of high attitude status to ground status is among 0.35 and 0.45. In general, the peak number of nozzle＇s infrared performance is con- tinuously decreasing with the increase of vector angle.