二元收-扩喷管与球形收敛调节片喷管的性能对比研究

Comparative Study on Performance of Two Dimensional Convergent-Divergent Nozzle and Spherical Convergent Flap Nozzle

为了对比二元收-扩喷管(2DCD)与球形收敛调节片喷管(SCFN)的性能,基于CFD数值计算软件对2种喷管在相同工作点下进行了内外流场计算与分析。数值模拟结果表明:在相同高度及飞行马赫数条件下,SCFN的流量系数相较于2DCD呈现出较大不同,推力系数则略差于2DCD;在低落压比条件下,2种喷管内流对后体阻力特性影响不大;在高落压比条件下,2种喷管内流对后体阻力特性影响较大。

In order to compare the performance of two Dimensional Convergent-Divergent Nozzle （2DCD） and Spherical Convergent Flap Nozzle （SCFN）, the calculation and analysis in the internal and external flow field at the same operating point based on CFD computational simulation software were performed. The numerical simulation results show that under the condition of the same altitude and flight Mach number, the mass flow coefficient of SCFN compared to the 2DCD＇s exhibits quite different and the thrust coefficient of SCFN is slightly worse than the 2DCD＇s. Under the condition of low nozzle pressure drop ratio, internal flow of two kinds of nozzles has little effect on after-body drag coefficient; under the condition of high nozzle pressure drop ratio, internal flow of two kinds of nozzles has a great influence on after-body drag coefficient.