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.
Highlights
Rotary vane pumps are suitable for multiple applications due to their advantages of compactness, lightweight, low cost and low bearing forces [1,2,3,4,5]
One main application for rotary vane pumps is the usage as oil pump for automatic transmissions [6,7]
A higher pressure gradient leads to higher volumetric flow rates flow rates through the radial and axial gaps as well as through the groove. These effects result in a through the radial and axial gaps as well as through the groove. These effects result in a pressure rise pressure rise of the internal displacement chamber pressure before connecting to the delivery port
Summary
Rotary vane pumps are suitable for multiple applications due to their advantages of compactness, lightweight, low cost and low bearing forces [1,2,3,4,5]. At the gaps at the top and bottom of the rotor and vanes Overall, this working principle causes flow and delivery ports, the displacement chamber volume decreases and subsequently, the fluid is pushed out. One approach is to start the reduction in the chamber volume and compression of the oil in (lubrication film between vane and cam ring) and the axial gaps at the top and bottom of the rotor advance of the connection to the delivery port (precompression). Housing, approach is to start the reduction thecompressibility chamber volume andoil, compression of the oil in DueOne to the high pressure gradients and thein low of the small changes in the groove shapeofand in conjunction with the precompression have aTherefore, big impactthe on the resulting advance theposition connection to the delivery port (precompression). Pressure curveofofthe a displacement are related flow phenomena of other displacement chambers and to the angular position of the vanes in the pump geometry by means of the simulation
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