The CFD Based Estimation of Pressure Pulsation Damping Parameters for the Manifold Element

Vibrations and noise caused by the pressure pulsations in the volumetric compressor manifolds have a high impact on the compression power requirement and the reliability of manifold operation. For the pressure pulsations attenuation, different types of mufflers are applied using a design based on the Helmholtz resonator model approach. This is particularly effective for the constant revolution speed compressors. For the widely introduced variable revolution speed compressors, other pressure pulsation attenuation methods are required. One of the possibilities to attenuate the pressure pulsations over a wide range of frequencies is the introduction of specially shaped nozzles in the gas duct flow. The CFD impulse flow simulations can be used as a tool for the estimation of the nozzle influence on the pressure pulsations damping. The direct 3D or 2D CFD simulation results are difficult to apply for this estimation. A new method has been worked out to obtain the damping coefficient for the diverse nozzle type, using the numerical simulation results of the impulse flow propagation. In this paper the application of the Levenberg-Marquardt method for damping parameter estimation is shown. This method allows fitting the attenuation curves described by damped equations to obtain damped oscillation functions from CFD results. In this paper the CFD based estimation method of pressure pulsation damping parameters is illustrated with an example of its application for a nozzle.