Numerical study of a trapezoidal bypass dual throat nozzle

Huang, Shuai; Xu, Jianzhong; Yu, Kaikai; Wang, Yangsheng; Pan, Ruifeng; CHEN, Kuangshi; ZHANG, Yuqi

doi:10.1016/j.cja.2022.11.015

Cited by 13 publications

(1 citation statement)

References 27 publications

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“…No matter which control method is used, the secondary flow mainly comes from the compressor of the engine, and the increase in the secondary flow rate not only increases the vector angle but also reduces the performance of the engine. In order to alleviate or even eliminate the engine performance degradation caused by the secondary flow, researchers proposed bypassing the DTN [28][29][30], bypassing the SVC method [31][32][33], and other new methods [34]. Combined with the previous ideas, we propose an enhanced shock vector control nozzle (ESVC), which has the characteristics of both throat skewing and the SVC method.…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic Characteristics of the Novel Two-Dimensional Enhanced Shock Vector Nozzle

Shu,

Gao,

Huang

et al. 2024

Aerospace

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Fluid thrust vectoring (FTV) control has obvious advantages in structural quality and stealth performance because of its fast response and light weight. However, improving FTV vector performance will cause a loss in engine performance due to the need to draw airflow from the engine. In order to alleviate the above problems and further improve the vector performance of FTV, a nozzle combined with throat skewing and shock vector control is proposed, and the secondary flow of the nozzle comes from the throat and is injected into the nozzle divergence section. The numerical results indicate that compared with the original configuration, the vector angle and vector efficiency of the new configuration are more linear with the nozzle pressure ratio (NPR), and the vector angle and vector efficiency are improved by 163% and 218%, respectively, while experiencing a maximum reduction in the thrust coefficient of 1.4%. Compared with the only bypass-type shock vector nozzle, the new configuration utilizes the diversion of the two jets to eliminate the reattachment of the separation bubble after the jet and its resulting abrupt change in vector performance, improving the performance while having good control characteristics. Additionally, a sensitivity analysis of the spacing between two jets is also carried out. The spacing between two jets should be increased to make the flow pass through two weaker shock waves to improve the vector performance while ensuring that the separation after the jet is no longer attached.

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