Experimental and numerical investigation of interior flow-induced noise in pump as turbine
Experimental and numerical investigation of interior flow-induced noise in pump as turbine
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DOI：
10.21595/jve.2016.17096
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发表时间：
2016-08
影响因子：
1
通讯作者：
L. Dong;Cui Dai;Hou-lin Liu;F. Kong
中科院分区：
文献类型：
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作者：
L. Dong;Cui Dai;Hou-lin Liu;F. Kong
泵涡轮机中的流致内部噪声（PAT）由流载噪声和来自偶极源的流致结构噪声组成。如果不能准确区分车内主要噪声，就无法指导噪声控制和管理。对转子和机壳进行了流致内部噪声和自由模态实验，验证了数值方法的准确性。建立了考虑内部声场结构的流致噪声和流载噪声的计算模型。在此基础上，区分了各个噪声源的频谱特征及其对总噪声的贡献。研究发现，在内部噪声中，流致结构噪声的辐射能量小于偶极源产生的流传噪声的辐射能量。与实验相比，考虑套管声源结构的流传噪声能够更准确地反映多声源的共同作用。特别是在较大流量条件下，叶片通过频率 (BPF) 及其谐波的最大误差仅为 5.9%。
The flow-induced interior noise in pump as turbine (PAT) consists of flow-borne noise and flow-induced structure noise from dipole source. Without accurate distinguishing of main interior noise, the noise control and management cannot be guided. The experiments of flow-induced interior noise and free modals for rotor and casing were performed to validate the accuracy of numerical methods. The computational models for flow-induced noise and flow-borne noise considering structure in interior acoustic field were developed. On the basis of this, the spectrum characteristics of each noise source and their contribution to the total noise were distinguished. It is found that within interior noise, the radiated energy of flow-induced structure noise is less than that of flow-borne noise generated by dipole source. Compared with the experiment, the flow-borne noise considering structure due to casing source can more precisely reflect joint action of multiple sources. Especially in larger flow conditions, the maximum error is only 5.9 % at Blade-Passing Frequency (BPF) and its harmonics.