Vortex Flow Structure in Ultra-Highly Loaded Axial Turbine Linear Cascade

Abstract

In this study, the compressible turbulent flow in the ultra-highly loaded axial turbine linear cascade (UHLTC) was numerically analyzed by using the commercial CFD code in order to clarify the characteristic vortex flow structure in the cascade passage in detail. The computed results suggested that the passage vortex was not generated because of the rapid and strong separation of the pressure side leg of horseshoe vortex from the endwall. As a result, the effective loss reduction technique for UHLTC was considered to be the leading edge filet which had the ability to reduce the leading edge horseshoe vortex.