Abstract
The paper deals with the experimental and numerical examination of the flow field around throttle plates which are part of the suction side used in combustion engines. One important issue addresses the change of the flow behavior at different flap positions and transient effects. The interests are focused on the total pressure difference, the mass flux and turbulence characteristics. An existing test bench was adapted and instrumented to carry out the measurements. Experimental data are compared to numerical results, which are obtained from CFD calculations, involving several tools like FIRE and STAR-CD. The steps which lead from the geometry set-up and model design to the grid generation and finally to the CFD calculation are shown.
The grid generation is a very important point, because time for grid generation could be reduced dramatically using paramerized grid generation.
In this paper the conventional implementation is compared to the parametric implementation of grid generation.
With two design parameters of the throttle plate (diameter and plate angle), the whole grid can be produced. This parametric grid generation method changes the design parameters in Pro Engineer (CAD Tool) and generates the grid automatically.
In this context, parameter studies are presented which reflect the influences of model assumptions, numerical discretization schemes and grid refinement on the numerical results. Comparison is made between calculated results obtained from different CFD tools.