Vortex Shedding Behind a Blunt Trailing Edge Turbine Blade

Abstract

By computational and experimental means, this work investigates unsteady mixing processes of the wake behind a blunt trailing edge turbine blade. Numerical solutions of the Reynolds averaged Navier Stokes equations have been earned out employing state-of-the-art algorithms in a fully conservative structured multi-block approach.Predicted aerodynamic performance profile and unsteady flow field features compare favorably with a set of measurements carried out on a large scale nozzle guide vane.

Energy Separation in High Subsonic Turbine Cascade

“…The numerical nonuniform pressure distribution along the trailing edge surface confirms the experimental data 17) and is different from the uniform pressure distribution observed experimentally by Cicatelli and Sieverding 14) and confirmed numerically by Sondak and Dorney 15) and Cicalelli et al 16) at low Mach number. El-Gendi et al 21) showed that this non-uniform pressure distribution results from highly unsteady pressure fluctuations caused by vortex formation close to the trailing edge at this high Mach number, M 2is ¼ 0:79.…”

“…Regarding this issue, Desse 13) conducted an experiment for flat plates, and Cicatelli and Sieverding 14) considered a turbine cascade with M 2,is ¼ 0:4. Sondak and Dorney 15) and Cicalelli et al 16) investigated this problem numerically using the same cascade and flow conditions as Cicatelli and Sieverding.…”

“…[14][15][16]18) This study conducted numerical simulation of trailing edge vortex shedding from a turbine cascade at high subsonic Mach number. Previously, most flow modeling has been limited to the low Mach number case of M 2,is ¼ 0:4.…”

Elliptic Trailing Edge for a Turbine Blade: Aerodynamic and Aerothermal Effects

“…Ó 2013 The Japan Society for Aeronautical and Space Sciences Cicatelli and Sieverding 6) found a uniform pressure distribution at the TE of a turbine cascade at M 2;is ¼ 0:4. Sondak and Dorney 7) and Manna et al 8) numerically confirmed this distribution using the same cascade and flow conditions as Cicatelli and Sieverding. 6) Sieverding et al 9) conducted experiments at M 2;is ¼ 0:79 on a cascade with half the scale of that used in other research.…”

“…6) Sieverding et al 9) conducted experiments at M 2;is ¼ 0:79 on a cascade with half the scale of that used in other research. [6][7][8] They noticed that the TE pressure distribution is non-uniform. This non-uniformity decreases the average value of the base pressure and hence increases the TE loss.…”