发动机喷流对飞机阻力伞性能的影响
作者:
作者单位:

1.南京航空航天大学航空学院飞行器环境控制与生命保障工信部重点实验室,南京 210016;2.中国飞行试验研究院,西安 710089;3.南京航空航天大学民航学院,南京 211106;4.航空工业航宇救生装备有限公司航空防护救生技术航空科技重点实验室,襄阳 441003

作者简介:

通讯作者:

孙建红,男,教授,博士生导师,E-mail: jhsun@nuaa.edu.cn。

中图分类号:

V244.1;V211.3

基金项目:

航空科学基金(20172952031)资助项目;江苏高校优势学科建设工程资助项目;飞行器环境控制与生命保障工信部重点实验室开放基金(KLAECLS-E-201904)资助项目;江苏省博士后基金(2019K126)资助项目。


Effect of Engine Nozzle Flow on Performance of Aircraft Drag Parachute
Author:
Affiliation:

1.Key Laboratory of Aircraft Environment Control and Life Support, MIIT, College of Aerospace Engineering, Nanjing University of Aeronautics & Astronautics, Nanjing 210016, China;2.Chinese Flight Test Establishment, Xi’an 710089, China;3.College of Civil Aviation, Nanjing University of Aeronautics & Astronautics, Nanjing 211106, China;4.Aviation Key Laboratory of Science and Technology on Life-Support Technology, AVIC Aerospace-Life-Support Industries Ltd., Xiangyang 441003, China

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    摘要:

    飞机阻力伞工作过程中,往往飞机发动机仍未停机,高速发动机喷流会对阻力伞流场产生影响,进而影响阻力伞的工作性能。针对发动机喷流对阻力伞的影响,本文采用流固耦合方法对不同喷流速度下的阻力伞动态开伞过程进行数值仿真,分析了不同喷流速度对阻力伞阻力特性、阻力伞稳定性以及流场特性的影响。研究发现,发动机喷流会使阻力伞前的气流速度变大,从而导致阻力伞动载峰值变大,充满状态的稳态载荷变大,动载峰值出现时刻前移。在本文计算工况下,当发动机喷流速度为250 m/s时,阻力伞充满状态稳态载荷增加21%;当喷流速度为350 m/s时,阻力伞充满状态稳态载荷增加51%;当喷流速度为500 m/s时,阻力伞充满状态稳态载荷增加79%。同时,发动机喷流会使得伞衣内侧下方的压力偏大,导致伞衣压力分布不对称,从而使得阻力伞发生上下摆动,且喷流速度越大,阻力伞摆动振幅越大,阻力伞稳定性越差。

    Abstract:

    During the operation of the aircraft drag parachute, the aircraft engine is often not shut down. The high-speed engine nozzle flow will have a certain impact on the flow field of the drag parachute, thereby affecting the performance of the drag parachute. To study the influence of engine nozzle flow on the drag parachute, the fluid-structure coupling method is used to simulate the dynamic parachute opening process of the drag parachute under different nozzle velocities. And the effect of different nozzle velocities on the drag characteristics and stability of the drag parachute are analyzed. Research has found that the engine nozzle flow will increase the fluid velocity in front of the drag parachute, which causes the drag parachute’s opening shock peak time to move forward, the opening shock peak value increases, and the average value of the aerodynamic resistance increases. When the nozzle flow velocity is 250 m/s, the average aerodynamic resistance of the drag parachute in the full state is increased by 21%. When the nozzle flow velocity is 350 m/s, the average aerodynamic resistance of the drag parachute is increased by 51%. When the nozzle flow velocity is 500 m/s, the average aerodynamic resistance of the drag parachute is increased by 79%. At the same time, the engine nozzle flow will make the pressure under the inner side of the parachute higher. The asymmetrical pressure distribution of the inner side makes the drag parachute swing up and down. And the greater the nozzle velocity is, the greater the swing amplitude of the drag parachute will be. The nozzle velocity will make the stability of the drag parachute worse.

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孙智,冯传奇,孙建红,喻东明,许常悦,寇泽普.发动机喷流对飞机阻力伞性能的影响[J].南京航空航天大学学报,2021,53(2):202-210

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  • 收稿日期:2020-12-15
  • 最后修改日期:2021-02-20
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  • 在线发布日期: 2021-04-29
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