超音速分离线喷管推力效率影响因素的数值研究

Numerical investigation on factors affecting thrustefficiency of supersonic splitline nozzle

超音速分离线喷管作为一种新型可动喷管,在机械结构、流场分布、推力性能等方面具有不同于传统可动喷管的特点。由于具有偏转放大效应特点,在执行矢量控制时超音速分离线喷管性能较明显优于传统喷管。为了讨论其推力效率受不同因素影响的变化规律及作用机理,对不同摆角下超音速分离线喷管受不同因素影响的内流场开展数值仿真研究。结果表明:在给定的设计参数下,分离线间隙尺寸的增大对推力效率具有减益性,超音速分离线喷管在执行矢量控制时具有较高的推力效率;同时,相较于锥形扩张段,钟形扩张段喷管有着更好的推力效率。

As a new type of vectoring nozzle,supersonic separation line(SSSL)nozzle is different from traditional movable nozzle in mechanical structure,flow field distribution and thrust performance.Because of the deflection amplification effect,the performance of supersonic splitline nozzle is better than that of traditional nozzle when vector control is performed.In order to discuss the variation rule and mechanism of thrust efficiency affected by different factors,the internal flow field of supersonic splitline nozzle affected by different factors and swing angles was numerically simulated in this paper.The results show that under the given design parameters,the supersonic split line nozzle does have excellent thrust efficiency when performing vector control;The increase of the gap size of the separation line has a negative effect on the thrust efficiency;Compared with the conical divergent section,the bell divergent section nozzle has better thrust efficiency.