Abstract
Experimental and analytical studies have been conducted to understand the characteristics of centrifugal compressor noise and to examine the influence of design parameters on the noise level [1,2]. The results reveal that BPF noise in relation to the impeller rotation plays an important role, which is found in the aeroacoustic study of noise generation through blade–tongue interaction and the effects of modifying the tongue and impeller geometries [3,4]. It is widely known that BPF noise components come from the circumferential flow distortions upstream and downstream of the impeller [5]. Present study focuses on the numerical investigation of this discrete noise. BEM solver coupled with Euler equations is introduced. The indirect variational BEM in the frequency domain is used to predict the inner and the outer noise propagation of the centrifugal compressor impeller. The method of flow analysis will be discussed in the next section, followed by discussions on boundary element method (BEM), calculation results, and conclusions.
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