Figure 2
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Influence of air in the system on the PSD of the measured wall pressure fluctuations at 
and 10 for the thick β = 20% orifice plate with 0.1 width upstream and downstream chamfers (20–0.5–0.05–0.05). The PSD and the frequencies are normalised with respect to dynamic pressure in the orifice 
, the average flow velocity within the orifice Uo and the orifice diameter Do.
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