### 不同冲击距离下斜板开槽对超声速射流冲击噪声的影响

1. 1. 中国空气动力研究与发展中心 空气动力学国家重点实验室, 绵阳 621000;
2. 中国空气动力研究与发展中心 气动噪声控制重点实验室, 绵阳 621000;
3. 湖南科技大学 机械设备健康维护湖南省重点实验室, 湘潭 411201
• 收稿日期:2021-04-23 修回日期:2021-06-03 出版日期:2022-08-15 发布日期:2021-05-26
• 通讯作者: 赵鲲,E-mail:zhaokun@cardc.cn E-mail:zhaokun@cardc.cn
• 基金资助:
空气动力学国家重点实验室研究基金(SKLA201920101);气动噪声控制重点实验室研究基金(ANCL20200306)

### Influence of slotting on inclined plate at different impact distances on impact noise of supersonic jet

QI Longzhou1,2,3, ZHAO Kun1,2, FENG Heying3, ZHANG Junlong1, QIN Chen1

1. 1. State Key Laboratory of Aerodynamics, China Aerodynamics Research and Development Center, Mianyang 621000, China;
2. Key Laboratory of Aerodynamic Noise Control, China Aerodynamics Research and Development Center, Mianyang 621000, China;
3. Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment, Hunan University of Science and Technology, Xiangtan 411201, China
• Received:2021-04-23 Revised:2021-06-03 Online:2022-08-15 Published:2021-05-26
• Supported by:
Open Funding from State Key Laboratory of Aerodynamics (SKLA201920101);Open Funding from Key Laboratory of Aerodynamic Noise Control (ANCL20200306)

Abstract: The noise radiation of the aircraft carrier seriously threatens the physical and mental health of the ground personality and the safety of the precision instruments on the aircraft carrier, and this problem can be simplified as a supersonic jet impact inclined plate problem. This paper studies the influence of the surface groove structure on the impact noise characteristics with high frequency Particle Image Velocimetry (PIV) and far field noise measurement to explore the noise reduction mechanism of the groove structure and determine the nozzle-deflector impact distance. The results show that the slotted surface of the inclined plate can effectively reduce the impact jet noise, and the noise reduction effect is closely related to the impact distance. If the impact distance is 3-5 times the nozzle diameter (L/d=3-5), the noise reduction effect of the slotted inclined plate is the best at L/d=3.8. The slotted inclined plate can effectively reduce the noise of supersonic impinging jet mainly because of its good inhibitory effect on the screech tone. When the Mach number is 1.12, the main sound source area of the screech tone is located at the rear edge of the fourth shock cells for a circular nozzle with an outlet diameter of d=56 mm, which is consistent with the current general knowledge. With a proper impact distance, the groove structure can affect the shock cells, thereby effectively suppressing the screech tone.