Gasdruckschwingungsverteilung im Meridianschnitt von Seitenkanalverdichtern

The blade pass and the turbulent eddy flow in unsteady pressure field of the side channel cause heavy gas pressure oscillation in the side channel with negative concomitant phenomenons, mechanical vibration stimulus of the compressors casing and noise emission from the compressor. The gas pressure oscillation isn´t homogeneous distributed in the side channel, but it shows a topology with considerable gradients in profile of the side channel at α_K = constant with more intense dependence in circumferential direction. Gas pressure oscillation can be characterized by RMS, peak value of gas pressure oscillation and amplitude value of gas pressure oscillation at blade rotation frequency as main stimulating frequency. In this report experimental results of gas pressure oscillation of a side channel compressor are presented.