切向流条件下融合阻抗模型的声阻抗与管内流速同步提取方法  

Simultaneous eduction of acoustic impedance and in-duct flow velocity for the fused impedance model under the grazing flow condition

作　　者：景秋岚 肖友洪[1] 余亮 JING Qiulan;XIAO Youhong;YU Liang(College of Power and Energy Engineering,Harbin Engineering University,Harbin 150001;School of Civil Aviation,Northwestern Polytechnical University,Xi’an 710072;State Key Laboratory of Airliner Integration Technology and Flight Simulation,Shanghai 200126)

机构地区：[1]哈尔滨工程大学动力与能源工程学院,哈尔滨150001 [2]西北工业大学民航学院,西安710072 [3]大型客机集成技术与模拟飞行全国重点实验室,上海200126

出　　处：《声学学报》2025年第2期287-298,共12页Acta Acustica

基　　金：国家自然科学基金项目(12074254,12474464)资助。

摘　　要：为解决声衬阻抗逆向提取方法中因流管内流/声场测量误差导致某些频率处声阻抗发生突变的问题,提出了一种改进的声阻抗提取方法,以实现切向流管内声衬阻抗及管内流速的同步准确提取。首先,引入频域声阻抗模型至模态匹配法中,建立切向流条件下的管道声场正向预测模型;然后,结合理论预测声场和流管测试声场构建包含声阻抗模型参数及管内流速等未知变量的全频段目标误差函数;最后采用内点法对待求变量进行优化求解。NASA的CT57型声衬切向流管试验标准数据集验证结果表明,该方法能够在保证计算效率的同时实现声衬阻抗及管内流速的同步提取。优化后的声阻抗曲线可保持良好的连续性,且在Ma<0.3工况下管内流速优化误差保持在10%以内。For solving the problem of abrupt changes of the acoustic liner impedance at certain frequencies due to the measurement errors in the flow/acoustic field of the grazing flow tube in the acoustic liner impedance inverse eduction method,an improved acoustic impedance eduction method is proposed to synchronize and accurately extract the acoustic liner impedance and flow velocity inside the flow tube.Firstly,the frequency domain acoustic impedance model is introduced into the mode matching method to establish the forward prediction model of the duct acoustic field under the grazing flow condition.Then,a full-band objective error function containing the unknown parameters of the acoustic impedance model and the in-duct flow velocity is constructed by combining the theoretically predicted acoustic field with the measured acoustic field inside the duct.Finally,the interior point method is utilized to optimize the variables to be solved.The validation results of the NASA baseline dataset of the grazing flow tube test with the CT57 acoustic liner show that the proposed method can realize the simultaneous eduction of the acoustic impedance and the flow velocity inside the flow duct while guaranteeing the computational efficiency.The optimized acoustic impedance curve maintains good continuity,and the optimization error of the flow velocity is kept within 10%under the condition of Ma<0.3.

关 键 词：切向流 声衬 声阻抗 模态匹配 阻抗提取 

分 类 号：V231.3[航空宇航科学与技术—航空宇航推进理论与工程]