航空学报 > 2024, Vol. 45 Issue (24): 630568-630568   doi: 10.7527/S1000-6893.2024.30568

首届空天前沿大会优秀论文专栏

液体火箭发动机喷焰多波段辐射信号高度律

孙一强1, 朱檀枭1, 牛青林2, 贺志宏1, 董士奎1()   

  1. 1.哈尔滨工业大学 空天热物理工信部重点实验室,哈尔滨 150001
    2.中北大学 机电工程学院,太原 030051
  • 收稿日期:2024-04-22 修回日期:2024-05-25 接受日期:2024-06-25 出版日期:2024-12-25 发布日期:2024-07-08
  • 通讯作者: 董士奎 E-mail:dongsk@hit.edu.cn
  • 基金资助:
    国家自然科学基金(U22B2045)

Altitude-scaling law for multi-band radiation signals from liquid-propellant rocket engine exhaust plumes

Yiqiang SUN1, Tanxiao ZHU1, Qinglin NIU2, Zhihong HE1, Shikui DONG1()   

  1. 1.Key Laboratory of Aerospace Thermophysics of Ministry of Industry and Information Technology,Harbin Institute of Technology,Harbin 150001,China
    2.College of Mechatronic Engineering,North University of China,Taiyuan 030051,China
  • Received:2024-04-22 Revised:2024-05-25 Accepted:2024-06-25 Online:2024-12-25 Published:2024-07-08
  • Contact: Shikui DONG E-mail:dongsk@hit.edu.cn
  • Supported by:
    National Natural Science Foundation of China(U22B2045)

摘要:

实际探测中火箭发动机喷焰单波段红外辐射强度与飞行高度之间往往是一种非单调关系,在反演高度时,会出现多值性问题。以典型液体火箭发动机尾喷焰为研究对象,基于计算流体力学(CFD)方法计算尾喷焰反应流场的温度、压力和组分信息,采用视在光线(LOS)法并结合NASA-SP-3080高温气体辐射物性数据库计算尾喷焰本征红外辐射信号,采用Modtran软件获取11~61 km俯视和水平观测时的大气透过率,进而计算得到火箭发动机尾喷焰表观辐射信号。从液体火箭发动机推进剂元素构成和气体辐射产生机理出发,提出基于多波段表观辐射强度构造无量纲特征参数,即所谓的相对二阶差(RSOD),作为尾喷焰红外辐射高度律的表征参数,分析获得了RSOD和飞行高度之间映射关系。研究发现,首先通过多波段辐射强度二次构造的辐射特征量,能够获得其与飞行高度的单调关联关系,且经过不同推力验证,具有一定普适性。然后,利用这种单调关系,能较好地反演发动机所在高度,在31~61 km范围内,反演结果更为准确。最后发现不同推进剂类型的RSOD区分度较好,推测利用RSOD信息作为特征量有利于区分不同的发动机类型。

关键词: 液体火箭喷焰, 表观红外辐射, 多波段, 相对二阶差(RSOD), 高度律

Abstract:

The relationship between the intensity of single-band infrared radiation from rocket motor plumes and flight altitude is often non-monotonic in actual detections. The issue of multivalence occurs in height inversion. This paper focuses on analyzing many typical liquid propellant rocket engine plumes. Computational Fluid Dynamics(CFD)is used to determine the temperature, pressure, and component information of the reactive flow field of the plume. The Light-on-Sight(LOS)method and the NASA-SP-3080 high-temperature gas radiative property database are employed to calculate the intrinsic infrared radiation signals of the plume. Additionally, the Modtran program is used to determine the atmospheric transmittance at altitudes ranging from 11 to 61 km in both top-down and horizontal observations. Subsequently, the apparent radiation signals of the rocket engine plume are computed. On the basis of the element composition of the liquid propellant and the mechanism of gas radiation generation, it is proposed to construct a dimensionless characteristic parameter based on the multi-band apparent radiance, the so-called Relative Second Order Difference(RSOD), as the characterization parameter of the altitude-scaling law of the plume infrared radiation. The monotonous mapping relationship between the RSOD and the flight altitude is obtained analytically. It is found that the monotonic correlation between the radiative signatures constructed through the quadratic construction of multi-band radiated signals and the flight altitude can be obtained, and it is verified by different thrusts that the relationship is universal to a certain extent. Then, using this monotonic relation, better inversion altitude results can be obtained, and the inversion accuracy is higher in the range of 31-61 km. Finally, it is found that the RSOD differentiation is better for different engine propellant types, and it is speculated that the use of RSOD information as a characteristic quantity can be beneficial to differentiating engine types.

Key words: liquid-propellant rocket engine exhaust plume, apparent infrared radiation, multi-band, Relative Second Order Difference (RSOD), altitude-scaling law

中图分类号: