Simulation aided thermal analysis of gap flows in an axial piston pump to improve its lubrication and leakage behavior
Research Task/Objectives
Distribution of 26 thermocouples and 5 gap height sensors in the valve plate
The gap flows as well as their interaction with the surrounding components for the cylinder block/valve plate gap are measured, calculated and analyzed. The temperature distribution in this sealing gap stands in the main focus of this approach, since it has a direct impact on the fluid viscosity and thus on friction and leakage.
Furthermore, a FSI-model based on commercially available software is developed to derive constructive and operational strategic measures to manipulate the temperature field and thus the viscosity in the gap.
Approach
Dependence of the temperature fields on the pressure and the speed
The analysis of all measured pressures and speeds at the current states of the project showed that the tilt angle has a negligibly small influence on the temperature fields in the gap, however, the measured temperature distribution depends strongly on the speed and the pressure. The experimental measurement results will be subsequently used to validate the evoloving FSI models.
The project 18975 BR/1 was financed and supervised by the Research Association Mechanical Engineering – FKM, Lyoner Straße 18, 60528 Frankfurt am Main. In the scope of the Programme to promote Industrial Collective Research it was funded by the German Federation of Industrial Research Associations (AiF) with means of the Federal Ministry of Economic Affairs and Energy (BMWi) on the basis of a decision by the German Bundestag.