Figure 7

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Pressure fluctuations established by the CFD evaluated at four different points, considering a simulation time of 0.01352265 s, which corresponds to 20 turns. Evaluation points are located in the longitudinal axis of the inlet, and their position is defined by referring to the impeller hub. The evaluation points are located x/DW = 0.08 (), x/DW = 0.81 (), x/DW = 1.62 (), and x/DW = 2.42 () with DW as the duct diameter. For postprocessing, the signal was separated into five different blocks with 45% overlap and a Hamming window function was used. This results in a frequency resolution of about Δf ≈ 150 Hz.

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