次流通道对双喉道气动矢量喷管的性能影响研究

Effects of Secondary Injection Pipe on Dual Throat Nozzle Thrust-Vectoring Performances

关键词:  双喉道气动矢量喷管  次流管道  次流百分比  推力矢量性能  数值模拟

Key words:  Dual Throat Nozzle  Secondary injection pipe  Ratio of secondary injection  Thrust-vectoring performances  Numerical simulation

摘要:

为了进一步了解次流通道对双喉道气动矢量喷管(Dual Throat Nozzle，DTN)气动矢量性能的影响，基于二维DTN喷管构型进行了详细的数值模拟研究。结果表明:收扩的次流通道相对于平直的次流通道不会改善DTN喷管的推力矢量性能；随着次流流量增加，DTN的推力矢量角存在一个最大值，超过该值各推力矢量性能均会降低；次流通道宽度对DTN喷管推力矢量性能影响显著:(1)次流宽度不影响所能达到的最大推力矢量角；(2)小的次流宽度在进口总压较高的条件下具有更高的推力矢量角；(3)增大次流宽度能降低次流总压，但达到的矢量角会有所减小。

Abstract:

Numerical studies on 2D dual throat nozzle(DTN) were performed focusing on the secondary injection pipe to get the effects on the DTN’s thrust-vectoring performances. Results show that the secondary injection pipe in the convergence and divergence shape can not improve the DTN’s thrust-vectoring performances compared with the one with parallel pipe. As the mass of secondary injection increases，the DTN’s vector angle has a maximum value and if it is larger than this value，it will lead to the reduction of the DTN’s thrust-vectoring performances. The width of the secondary injection pipe has significant effects on the DTN’s performances.The maximum vector angle of the DTN does not vary in different width of the secondary injection pipe. The DTN can get a larger vector angle with a low mass ratio of the secondary injection when the width of pipe is small，but the total pressure of the secondary injection is relatively high. Increasing the width can reduce the secondary injection total pressure，but the vector angle the DTN can get will be lower.