AI A A-90-0688 Multigrid Euler Calculations For Three-dimensional Cascades
نویسنده
چکیده
extension of the previous work, A fast and accurate numerical method for solving the three-dimensional Euler equations is applied to cascade calculation. Test cases of a VKI turbine cascade and a low pressure turbine cascade are presented. Results of isentropic Mach number distributions on blade surfaces show good agreements with experimental data a t design conditions, while discrepancy exists at off design conditions due to flow separation. With equal efficiency the method is also able to capture the basic features of secondary flow due to inlet side-wall boundary layers. Numerical results support the theory that the development of passage and horse-shoe vortices in cascades is, to a large extent, due to the inviscid convection of the inlet side-wall boundary layers.
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