Numerical investigation of improving the performance of a single expansion ramp nozzle at off-design conditions by secondary injection
Numerical investigation of improving the performance of a single expansion ramp nozzle at off-design conditions by secondary injection
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通过二次喷射提高非设计条件下单膨胀坡道喷嘴性能的数值研究
DOI：
10.1016/j.actaastro.2017.01.013
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发表时间：
2017-04
影响因子：
3.5
通讯作者：
Mo Jianwei
中科院分区：
文献类型：
--
作者：
Lv Zheng;Xu Jinglei;Mo Jianwei
单一膨胀斜面喷管(SERN)在非设计条件下过度膨胀，其性能较差。本文的研究重点是通过在发动机罩上进行二次喷射来改善SERN的性能，并使用k−εRNG湍流模型进行。二次喷射产生的入射冲击波冲击膨胀坡道，导致分离，沿坡道的压力分布增大。当喷嘴压力比(NPR)为10时，SERN的性能得到显著改善，推力系数、升力和俯仰力矩分别增大了3.16%、29.43%和41.67%。喷嘴位置对升力和俯仰力矩有较大影响，当喷射器位于发动机罩尾部时，俯仰力矩的方向可以由机头朝上变为机头朝下。当运行NPR远离设计点时，喷油对轴向推力系数的影响更为明显，而升力和俯仰力矩的影响则相反。喷射总压和喷射宽度的增加对SERN的性能有积极的影响。在参数φ不变的情况下，轴向推力系数随着喷油总压的降低而增大，因此在不减小升力和俯仰力矩的情况下，也可以采用低能流作为二次喷油。在不降低SERN性能的情况下，采用较高的总温流量可以降低注塑的质量流量。
The performance of a single expansion ramp nozzle (SERN) is poor due to over-expansion at off-design conditions. The present study focuses on improving the SERN performance by secondary injection on the cowl and is carried out by using the k− ε RNG turbulence model. The incidence shock wave resulting from the secondary injection impinges on the expansion ramp, resulting in separation and the increase of the pressure distribution along the ramp. The performance of the SERN can be improved significantly, and the augmentation of the thrust coefficient, lift and pitch moment can be as high as 3.16%, 29.43% and 41.67%, respectively, when the nozzle pressure ratio (NPR) is 10. The location of the injection has a considerable effect on the lift and pitching moment, and the direction of the pitch moment can be changed from nose-up to nose-down when the injection is on the tail of the cowl. The effect of the injection on the axial thrust coefficient is much more apparent, if the operation NPR is far from the design point, and however, the results for the lift and pitching moment are opposite. The increases of injection total pressure and injection width have positive impacts on the SERN performance. And if the parameter φ maintains constant, the axial thrust coefficient would increase when the injection total pressure decreases, so low energy flow can also be used as the secondary injection without decreasing the lift and pitching moment. The mass flow rate of the injection can be decreased by applying the higher total temperature flow without reducing the performance of the SERN.
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DOI：
10.2514/6.2007-5084
发表时间：
2007-07
期刊：
--
影响因子：
--
作者：
K. Deere;J. Flamm;B. Berrier;Stuart K. Johnson
通讯作者：
K. Deere;J. Flamm;B. Berrier;Stuart K. Johnson
DOI：
10.2514/6.2003-3803
发表时间：
2003
期刊：
--
影响因子：
--
作者：
K. Deere;B. Berrier;J. Flamm;Stuart K. Johnson
通讯作者：
K. Deere;B. Berrier;J. Flamm;Stuart K. Johnson
DOI：
10.1115/1.4025314
发表时间：
2014
期刊：
Journal of engineering for gas turbines and power
影响因子：
--
作者：
J. Mo;Jinglei Xu;Liuhuan Zhang
通讯作者：
J. Mo;Jinglei Xu;Liuhuan Zhang
DOI：
--
发表时间：
2013
期刊：
--
影响因子：
--
作者：
Mo Jianwei
通讯作者：
Mo Jianwei
DOI：
10.2514/6.1995-2616
发表时间：
1995-07
期刊：
--
影响因子：
--
作者：
David W. Lam
通讯作者：
David W. Lam