航空学报 > 2010, Vol. 31 Issue (4): 709-714

流体力学、飞行力学与发动机

迎角动态变化对二元高超声速进气道气动特性的影响

刘凯礼, 张堃预   

  1. 南京航空航天大学 能源与动力学院
  • 收稿日期:2009-03-02 修回日期:2009-06-12 出版日期:2010-04-25 发布日期:2010-04-25
  • 通讯作者: 刘凯礼

Effect of Dynamic Angle of Attack on Unsteady Aerodynamic Characteristics of 2D Hypersonic Inlet

Liu Kaili, Zhang Kunyuan   

  1. College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics
  • Received:2009-03-02 Revised:2009-06-12 Online:2010-04-25 Published:2010-04-25
  • Contact: kaiser-win@163.com

摘要: 针对高超声速飞行器受到扰动后迎角可能会发生瞬时大幅度改变或振荡的问题,对来流马赫数为4.03、迎角动态变化的二元高超声速进气道流场进行了非定常数值模拟,分别在进气道等速上仰和按正弦波振荡条件下研究了迎角动态变化对进气道气动特性的影响。计算结果表明:迎角动态变化时,进气道流场特征和性能参数的变化规律和稳态时情况基本保持一致,但是存在明显的迟滞现象;二元高超声速进气道动态上仰的迎角速率越大,进气道发生不起动时的迎角值越大;在进气道下壁面附近的低速区,非定常效应的影响显著,受进气道固壁面运动的影响,低速区的产生、发展及消失影响进气道气动特性。

关键词: 高超声速进气道, 迎角, 非定常, 不起动, 数值模拟

Abstract: In order to study the characteristics of hypersonic inlet response to rapid periodic dynamic angle of attack, numerical simulations are performed on 2D hypersonic inlets with dynamic angles of attack. The effect of dynamic angle of attack on unsteady aerodynamic characteristics is analyzed at a Mach number of 4.03. Two cases of the angle of attack motion are considered. In the first case, the inlet moves upward at a constant angular velocity, while in the second case it repeats a cyclic motion. The investigation suggests that: For dynamic increase of the angle of attack, similar to the steady cases,the characteristics of the flow field and the performance of the inlet are significantly altered, while the unsteady flow field feature and performance lag behind the steady cases. In the first case, the value of the angle of attack at unstart tends to increase with the rising of the angular velocity. In the low flow-speed area near the bottom wall, the impact of the unsteady flow on the aerodynamic characteristics of the inlet is significant: the appearance, development and disappearance of the low flow-speed area caused by the movement of the solid wall would alter the aerodynamic characteristics of the 2D hypersonic inlet.

Key words: hypersonic inlet, angle of attack, unsteady, unstart, numerical simulation

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