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Sr = Strouhal Number V = Velocity
L = Characteristic Length f = Frequency
The Strouhal number is a similarity criterion introduced when discussing physical similarity and modeling in fluid mechanics. Commonly used similar criteria include Reynolds number, Mach number, Froude number, Prandtl number, Eckert number and Nusselt number. The Strouhal number is used when considering circular motion with characteristic frequencies. For example, in the experiment of the model injection noise spectrum, we obtain the Strehal number of the frequency fp of the spectrum peak in the spectrum as St = =0.2 where: D is the diameter of the model nozzle; US is the injection speed. According to the similarity and modeling, the Strouhal number is a constant, then for the actual injection, the peak frequency of the injection noise is fp=0.2 where: UJ and D are the velocity and diameter of the actual injection .