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Acta Aeronautica et Astronautica Sinica ›› 2025, Vol. 46 ›› Issue (8): 630778.doi: 10.7527/S1000-6893.2024.30778

• special column • Previous Articles    

Calculation method for hypersonic plume infrared radiation based on a fast line-by-line calculation model

Jianyu XU1, Li ZHOU1,2(), Zhanxue WANG1,2, Jie SHI1, Hao SHI1   

  1. 1.School of Power and Energy,Northwestern Polytechnical University,Xi’an 710129,China
    2.Collaborative Innovation Center for Advanced Aero-Engine,Beijing 100191,China
  • Received:2024-06-03 Revised:2024-06-27 Accepted:2024-08-12 Online:2024-08-26 Published:2024-08-20
  • 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 (J2019-?Ⅱ?-0015-0036);Science Center for Gas Turbine Project (P2022-B-I-002-001, P2022-B-?Ⅱ?-010-001);the Fundamental Research Funds for the Central Universities(501XTCX2023146001)

Abstract:

To investigate the infrared radiation characteristics of plumes of hypersonic vehicles in near space, a computational methodology for the flow field of the near space plume infrared radiation was developed. Initially, the numerical simulation of the plume flow field is carried out by using the nonlinear coupling constitutive relationship model, and the accuracy of the flow field calculation model is verified. Subsequently, a comprehensive dataset consisting of 46 200 sets of flow field characteristic parameters and absorption coefficients was generated using a line-by-line calculation physical model, informed by a full-factorial experimental design. This dataset was employed to train an accelerated line-by-line calculation model based on a BP neural network. The trained model demonstrated a maximum mean absolute error of 0.003 65 and an R2 value of 0.999 4, achieving computational speeds four times faster than the traditional line-by-line calculation physical model. Finally, combined with the Backward Monte Carlo method as the infrared radiation transmission method, the infrared radiation calculation method of the hypersonic vehicles plume flow field is established. The infrared radiation characteristics of the plume under the cruising state of X-51A aircraft were studied by using the established flow field and infrared radiation calculation methods. The findings indicate that hypersonic plumes in near space exhibit a phenomenon where external heat flow envelops a cooler internal flow. Furthermore, the infrared radiation is stronger in the stagnation region at the plume’s periphery, resulting in a “scissors” pattern in infrared imaging. Variations in the shear layer significantly influence the infrared imaging characteristics of the plume.

Key words: hypersonic plume, nonlinear coupled constitutive relations, line by line method, deep learning, backward Monte Carlo method, infrared radiation

CLC Number: