Investigation of the Internal Displacement Chamber Pressure of a Rotary Vane Pump

Abstract

Low noise emissions of vehicle components are today a quality feature in the automotive sector. In automatic transmissions in particular, the hydraulic pump often contributes significantly to noise, which motivates research to clarify the noise sources and transmission pathways in these components. The subject of the present investigation is the generation of noise by the inherently instationary flow in hydraulic pumps. In order to shed some light on these phenomena, a computational fluid dynamics (CFD) simulation model for flow investigations on rotary vane pumps was set up. In this work, first the influence of different simulation parameters on the numerical results is analyzed. Then the pressure in the internal displacement chambers of the pump is examined, as it can be assumed that this is the essential parameter for noise generation. Different operating conditions such as rotational speeds and delivery pressures are investigated. Furthermore, the simulation results are compared to pressure measurements for validation and are used to find optimization potentials.

A Combined CFD-FEM Approach to Predict Fluid-Borne Vibrations and Noise Radiation of a Rotary Vane Pump

“…In order to do so, the excitation signal of the pump has to be correct. Therefore, the pressure in a displacement chamber of the pump is monitored (compare [20]). The numerical and experimental results for 2000 rpm and 15 bar outlet pressure are displayed in Figure 18.…”

“…Additionally, the high frequency fluctuations visible in the measurement cannot be captured by the CFD simulations. Possible causes for these fluctuations are vibrations of the pump housing and pipes, which interact with the fluid in the pump [20]. Overall, the simulation and the The frequencies, which match the blade passing frequency of the pump and its harmonics, usually contribute with the highest amount to the pump's noise radiation.…”

“…In the present work, the model of [20] is used to perform the CFD simulations. This model uses a morphing mesh approach to discretize the moving parts.…”

“…For this purpose, in this work the flow in the pump is analyzed using a 3D-CFD simulation model build up in the commercial software STAR-CCM+. The results of this CFD model have been validated against displacement chamber pressure measurements in [20]. Based on these results, the present paper focuses on the data transfer between the simulations and the vibroacoustic analysis.…”