| 赵坤1，刁志成2，何立明1 ，曾昊1，杜宏亮3，刘圣平1.连续超声速射流对撞的试验研究[J].航空发动机,2018,44(1):69-74 |
| 连续超声速射流对撞的试验研究 |
| Experimental Investigation on Continuous Supersonic Jet Collision |
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| DOI： |
| 中文关键词: 超声速射流 对撞 阴影 动态压力 辐射噪声 航空发动机 |
| 英文关键词:supersonic jet collision shadow dynamic pressure radiation noise aeroengine |
| 基金项目:国家自然科学基金（91541109和51406234）资助 |
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| 中文摘要: |
| 为研究2级脉冲爆震发动机中射流对撞的机理，开展了自由空间内连续超声速射流对撞的试验，通过分析流场阴影、动
态压力和辐射噪声揭示连续超声速射流对撞的机理。结果表明：自由空间内连续超声速射流对撞后产生的激波出现3 种运动模态：
拉锯脉动模态、左右摇摆模态和弓型旋拧模态。激波的拉锯脉动模态导致的压力脉动幅值较大，具有周期性；左右摇摆模态和弓型
旋拧模态导致的压力脉动幅值较小，具有随机性；射流对撞产生的啸叫频率低于声源的压力脉动频率 |
| 英文摘要: |
| In order to investigate the mechanism of continuous supersonic jet collision for 2-stage Pulse Detonation Engine, the
experiment on continuous supersonic jet collision in free space was performed, the mechanism of continuous supersonic jet collision was
uncovered through the analysis of flow field in the shadow, dynamic pressure and radiation noise. The results indicate that the see-saw
pulsation mode, the swing mode and the arch twist mode occur when the continuous supersonic jet collides in free space. The pressure
amplitude is bigger and periodic caused by see-saw pulsation mode while the pressure amplitude is smaller and random caused by swing
mode and arch twist mode. The noise frequency caused by supersonic jet collision is lower than the pressure pulsation frequency of sound
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