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Tourret, J., et al. (1991) Hydraulic Noise Generation Studies in Centrifugal Turbomachine through Visualization of the Non Stationary Pressure Field in the Volute and in the Impeller. ASME/Reprinted from FED, Vol. 128, Experimental and Numerical Flow Visualization, In: Khalighi, B., et al., Eds., Book No. 1991, 239-246.

has been cited by the following article:

• TITLE: Numerical Studies of BPF Pressure Pulsation in Centrifugal Ventilators

  AUTHORS: Sergey Timushev

  KEYWORDS: Centrifugal Fan, Pump, Pulsations, Noise Spectra, BPF, Acoustic-Vortex Equation

  JOURNAL NAME: Journal of Applied Mathematics and Physics, Vol.7 No.12, December 26, 2019

  ABSTRACT: There is a link between pressure pulsations in the centrifugal ventilator working cavity and its noise level on blade passing frequencies (BPF). They result from non-stationary hydrodynamic interaction between the impeller flow and volute casing. Pressure pulsations depend on quality of hydraulic profiling of ventilator. The amplification of pressure pulsations can happen due to matching of frequencies of oscillations with acoustic resonance frequencies. In ventilators the length of acoustic waves can be comparable to the size of the casing. Therefore, the variation of rotation speed, number of rotor blades, the fan installation in the ventilation system can substantially modify amplitudes of pressure pulsations due to the resonance inside the ventilator cavity. Various numerical studies of BPF pressure pulsation in ventilators are undertaken using the method and software package based on a representation of non-stationary motion of a compressible medium as a superposition of acoustic and vortex modes. In this case non-linear equations for unsteady vortex motion of an incompressible liquid are solved with a bigger time step. Wave equation relative to the pressure pulsations considering acoustic impedances on the borders of computational domain is solved by an explicit method. As a result, the whole processor time for both modes of oscillations is reduced and accuracy of prediction for the acoustical mode is improved.