双喷管超声速欠膨胀射流噪声特性研究  

Study on noise characteristics of supersonic under-expanded jets with twin-nozzle

作　　者：杨义 苟金澜 乐贵高[1] 邢成龙 YANG Yi;GOU Jinlan;LE Guigao;XING Chenglong(School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China;Wuhan Second Ship Design and Research Institute,Wuhan 430064,China;School of Electrical Engineering,Henan University of Technology,Zhengzhou 450001,China)

机构地区：[1]南京理工大学机械工程学院,南京210094 [2]武汉第二船舶设计研究所,武汉430064 [3]河南工业大学电气工程学院,郑州450001

出　　处：《航空动力学报》2025年第2期129-140,共12页Journal of Aerospace Power

摘　　要：为探索超声速欠膨胀射流在不同喷管间距条件下的流场特征和噪声传播机理,基于大涡模拟(LES)方法建立数值计算模型,对超声速欠膨胀射流的流场结构、射流近-远场的噪声声压分布规律进行计算。研究了喷管数量、喷管间距对声场的影响。利用Ffowcs Williams-Hawkings(FW-H)方程获取不同位置、不同角度的远场噪声特性;通过对近场信号接收点的时域压力脉动信号进行傅里叶变换获得近场噪声特性。研究发现:在两种喷管间距条件下,双射流呈现出对称和反对称的扑动模式(基频处),相较于单射流,不同的双射流扑动模式使得啸叫频率产生偏移。当喷管间距较小时,双射流近场压力脉动强度更大,近场噪声声压级幅值更大。射流远场声压级峰值频率随着观测角度的增大而升高,但在双射流平面内,两种工况下的噪声指向性变化趋势相同。In order to explore the flow field characteristics and noise propagation mechanism of an under-expanded supersonic jet under different nozzle spacing conditions,a numerical model was established based on the large eddy simulation(LES)method to calculate the flow field structure of underexpanded supersonic jet and the noise sound pressure distribution law of near-far field.The effects of the number of nozzles and the distance between nozzles on the sound field were studied.The far-field noise characteristics of different positions and angles were obtained based on the Ffowcs Williams-Hawkings(FW-H)equation;the near-field noise characteristics were obtained by performing Fourier transform on the time-domain pressure fluctuation signals of the near-field receivers.The results showed that under the condition of two kinds of nozzle spacing,the twin-jet presented symmetrical and anti-symmetrical flapping modes(at fundamental frequency);and compared with the single jet,the difference of the twin-jet flapping mode made the whistling frequency shift.When the distance between nozzles was small,the near-field pressure fluctuation intensity of twin-jet was greater,and the amplitude of near-field noise sound pressure level was larger.The peak frequency of the sound pressure level in the far field of the jet increased with the increase of the observation angle,but in the twin-jet plane,the change trend of noise directivity was the same under both working conditions.

关 键 词：欠膨胀射流 气动噪声 大涡模拟 喷管间距 Ffowcs Williams-Hawkings方程 

分 类 号：V211.3[航空宇航科学与技术—航空宇航推进理论与工程]