超声速喷管中激波分离诱发流场对称破缺的机理及其控制

贾睿东; 冯喜平; 陈慧

doi:10.13224/j.cnki.jasp.2020.01.025

超声速喷管中激波分离诱发流场对称破缺的机理及其控制

doi: 10.13224/j.cnki.jasp.2020.01.025

基金项目: 陕西省重点研发计划(2017ZDCXL-GY-02-02); 中央高校建设世界一流大学(学科)和特色发展引导专项资金(PY3A056)

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出版历程
- 收稿日期: 2019-09-11
- 刊出日期: 2020-01-28

Mechanism of symmetry breaking of flow field induced by shock separation in supersonic nozzle and its control

1.
School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China
2.
School of Astronautics,Northwestern Polytechnical University,Xi’an 710072,China
3.
Xi’an Aerospace Propulsion Institute,China Aerospace Science and Technology Corporation,Xi’an 710100,China

摘要

摘要: 为减缓或消除侧向力,开展了流动分离诱导流场对称破缺的机理研究。采用有限体积二阶迎风插值格式及k -ε湍流模型,数值模拟了某型超声速喷管的地面试车过程。详细分析了喷管内部的流场结构,着重讨论了喷管壁面附近出现的激波分离模式由自由激波分离到受限激波分离的转换过程。为了降低低空高背压条件下过膨胀喷管的侧向力,着重研究了喷管不同长径比、扩张比条件下的流场特性和流动分离模式。结果表明:在激波模式转换过程中能够诱发出极大的侧向力,改变喷管构型可以改善流场结构。适当缩短长径比和扩张比可以有效降低侧向力。长径比为105时将产生4 000 N以上的侧向力,而当长径比为095和115时,侧向力不超过20 N;当扩张比为539时,侧向力峰值达到4 000 N以上,而缩小扩张比到45时,侧向力明显下降。
- 超声速喷管 /
- 过膨胀 /
- 激波分离模式 /
- 侧向力 /
- 长径比 /
- 扩张比
Abstract: In order to mitigate or eliminate side force, the mechanism of symmetry breaking of flow field induced by flow separation was studied in detail. The finite volume second-order upwind interpolation scheme and k -ε turbulence model were used to simulate the working process of a supersonic nozzle on the ground. The flow structures inside the nozzle were studied, and the transition process of shock separation mode from freedom shock separation to restricted shock separation near the nozzle wall was analyzed in detail. In order to reduce the side force of over-expansion nozzle under the condition of low altitude and high back pressure, the flow field characteristics and flow separation mode under different length-diameter ratios and expansion ratios of nozzle were studied numerically. The results showed that a great side force can be induced in the process of shock mode transition, and the flow patterns or structures can be optimized by changing the nozzle configuration. And the side force can be effectively reduced by properly shortening the length-diameter ratio and expansion ratio. As the length-diameter ratio was 105, the side force was more than 4 000 N. But as the length-diameter ratio was 095 or 115, the side force didn’t exceed 20 N in the whole stage. And as the expansion ratio was 539, the peak value of side force reached more than 4 000 N, while as the expansion ratio was reduced to 45, the side force decreased obviously.
- supersonic nozzle /
- over-expansion /
- shock separation mode /
- side force /
- length-diameter ratio /
- expansion ratio

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参考文献(18)

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