二元喉道倾斜矢量喷管的数值模拟

利用数值模拟方法,对二元喉道倾斜矢量喷管进行了研究.研究了喉道单侧注气、扩张段辅助注气对喷管流场和性能的影响.研究结果表明:喉道单侧注气可以产生不对称的流动,产生矢量推力,但是推力矢量效率较低;扩张段辅助注气可以显著提高喷管的推力矢量性能;只有注气流量比较大时,才会出现典型的"喉道倾斜"现象;但是推力矢量控制效率最高的区域并不是出现在"喉道倾斜"之后,而是出现在弓形激波位置逐渐前移、扩张段注气口上游亚音速区域不断扩大的过程中.

Numerical simulation of two-dimensional fluidic throat skewing vector nozzle

The flow fields of the two-dimensional fluidic throat skewing vector nozzle were simulated numerically. The effects of the single side injection at the throat and the assisted injection at the divergent section on the flow and the performance of the nozzle were studied. These simulations show that the single side injection at the throat can generate an asymmetric flow, and result in thrust vector, but the vector angle is smaller; the assisted injection at the divergent section can improve the nozzle thrust performance remarkably; only with the larger injection flux, there will be a typical "throat skewing" phenomenon; however, the highest efficiency region of thrust vector control is not occurred after the "throat skewing" phenomenon, but in the process of the forward movement of the bow shock position and the expansion of the subsonic region upstream of the divergent section injection inlet.