Numerical Simulations of Sinusoidal Test Apparatus's Flow-Field Uniformity Affect to the Metrical Results

摘要

In order to study the sinusoidal test apparatus's (STA's) flow-field uniformity affect to the metrical results, this paper use computational fluid dynamics (CFD) numerical simulation method and divisional mesh technique to investigate the inner flow-field of a STA. Control-volume-based technique and Gauss-Seidel method are used to get the result of governing equation, and contours of all flow-field pressure and static pressure are given. The governing equations of flow are unsteady 2-dimensions Reynolds Averaged Navier-Stokes equations. The model of turbulence is Realizable k-epsilon model, and Two-layer zonal model is used near the wall. Use multilayer mesh technique to quicken convergence. Numerical simulation results show that the inner flow-field configurations of STA are very complex, which contain vortex, flow separation, shock etc. It also can be conclude that at the same inlet condition, the flow character of the pressure chamber mainly depends on the exhaust port acreage, and the flow-field uniformity affect the metrical results is not very obviously, These conclusions can be used in the over all design of STA, and it is also useful for the selection of structure and pneumatic parameters of pressure chamber.