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Flow over bodies or across edges of components in the gas stream can result in vortex shedding. These periodic disturbances in the flow pattern interact with the system acoustics to increase the levels of pulsation In the system. Because of the range of shapes and Reynolds numbers which can occur, Strouhal numbers can vary widely over the range 0.1 to 1.0. Each case should be assessed for the particular geometry, flow regime and possible acoustic modes. As a result this subject is outside the scope of these Guidelines and a separate assessment as to the potential for the occurrence of high pulsation levels should be made.
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