航空学报 > 2025, Vol. 46 Issue (15): 130791-130791   doi: 10.7527/S1000-6893.2024.30791

基于神经网络的S弯喷管-涡扇发动机多维度仿真

王承熙1, 周莉1,2(), 孙啸林3, 张晓博1,2, 王占学1   

  1. 1.西北工业大学 动力与能源学院,西安 210016
    2.先进航空发动机协同创新中心,北京 100191
    3.中国民用航空飞行学院 航空工程学院,广汉 618307
  • 收稿日期:2024-06-04 修回日期:2024-07-25 接受日期:2024-10-15 出版日期:2024-10-30 发布日期:2024-10-29
  • 通讯作者: 周莉 E-mail:zhouli@nwpu.edu.cn
  • 基金资助:
    国家自然科学基金(52376032);国家自然科学基金(52076180);陕西省杰出青年科学基金(2021JC-10);国家科技重大专项(J2019-Ⅱ-0015-0036);航空发动机及燃气轮机基础科学中心项目(P2022-B-I-002-001, P2022-B-Ⅱ-010-001);中央高校基本科研业务费专项资金(501XTCX2023146001)

Multi-dimensional simulation between serpentine nozzle and turbofan based on neural network

Chengxi WANG1, Li ZHOU1,2(), Xiaolin SUN3, Xiaobo ZHANG1,2, Zhanxue WANG1   

  1. 1.School of Power and Energy,Northwestern Polytechnical University,Xi’an 210016,China
    2.Collaborative Innovation Center for Advanced Aero-Engine,Beijing 100191,China
    3.College of Aviation Engineering,Civil Aviation Flight University of China,Guanghan 618307,China
  • Received:2024-06-04 Revised:2024-07-25 Accepted:2024-10-15 Online:2024-10-30 Published:2024-10-29
  • Contact: Li ZHOU E-mail:zhouli@nwpu.edu.cn
  • Supported by:
    National Natural Science Foundation of China(52376032);Funds for Distinguished Young Scholars of Shaanxi Province(2021JC-10);National Science and Technology Major Project of China (J2019-Ⅱ-0015-0036);Science Center for Gas Turbine Project (P2022-B-I-002-001,P2022-B-Ⅱ-010-001);Fundamental Research Funds for the Central Universities(501XTCX2023146001)

摘要:

S弯喷管内部流动复杂,气动性能影响参数多,传统的基于部件的发动机零维模型无法评估S弯喷管对整机产生的气动性能影响。使用反向传播(BP)神经网络建立了S弯喷管高可信度性能预测模型,并将其与涡扇发动机零维模型耦合,研究了基准S弯喷管对发动机速度、高度特性、部件特性的影响,以及在不同几何参数下喷管、发动机性能的差异。结果表明,相比轴对称喷管,装配S弯喷管的发动机性能下降,在海平面静止状态时,S弯喷管使发动机推力减小4.50%,耗油率增大4.75%;其风扇涵道比在海平面最大缩小0.33%,喘振裕度减少;而飞行高度为12 km时,风扇涵道比最大增大0.28%,喘振裕度增大;喷管在不同高度下对混合室内外涵的节流效果的差异导致了上述风扇工作特性变化趋势的不同。喷管长径比从2.2增大至3.0,改善了喷管性能,其推力系数、流量系数分别增大8.0%、4.8%。建立的S弯喷管-发动机多维度耦合模型能够有效地评估装配不同几何参数的S弯喷管后发动机性能、部件特性的变化。

关键词: 维度缩放, S弯喷管, 涡扇发动机, 多维度耦合, 神经网络, 几何参数

Abstract:

The internal flow of the serpentine nozzle is complex, with numerous parameters affecting its aerodynamic performance. Traditional component-based zero-dimensional engine models cannot accurately assess the aerodynamic performance impact of the serpentine nozzle on the overall engine. In this paper, a high-fidelity performance prediction model for serpentine nozzles is established using the back propagation (BP) neural network, and is coupled with a zero-dimensional turbofan engine model. This integrated approach is employed to investigate the influence of the baseline serpentine nozzle on engine speed, altitude characteristics, and component behaviors, as well as the differences in nozzle and engine performance with various geometric parameters. The results indicate that compared to axisymmetric nozzles, the engine equipped with the serpentine nozzle experiences a decline in performance. Specifically, at sea-level static conditions, the engine’s thrust decreases by 4.50%, while the fuel consumption increases by 4.75%; the fan bypass ratio decreases by a maximum of 0.33% at sea level, accompanied by a reduction in surge margin. Conversely, at an altitude of 12 km, the fan bypass ratio increases by a maximum of 0.28%, and the surge margin increases. These variation trends in fan operating characteristics can be attributed to the differences in throttling effects of the serpentine nozzle on the core and bypass of mixing chamber at different altitudes. Additionally, increasing the length-to-diameter ratio of the serpentine nozzle from 2.2 to 3.0 enhances its performance, resulting in an 8.0% increase in thrust coefficient and a 4.8% increase in discharge coefficient. The multi-dimensional coupling model between serpentine nozzle and engine established in this study can effectively evaluate the changes in engine performance and component characteristics following the installation of serpentine nozzles of varying geometric parameters.

Key words: numerical zooming, serpentine nozzle, turbofan engine, multi-dimensional coupling, neural network, geometric parameter

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