Reduction of Unsteady Forcing in a Vaned, Contra-Rotating Transonic Turbine ConfigurationHPT blade unsteadiness in the presence of a downstream vane consistent with contra-rotation is characterized by strong interaction at the first harmonic of downstream vane passing. E An existing stage-and-one-half transonic turbine rig design was used as a baseline to investigate means of reducing such a blade-vane interaction. E Methods assessed included: Aerodynamic shaping of HPT blades 3D stacking of the downstream vane Steady pressure-side blowing E Of the methods assessed, a combination of vane bowing and steady pressure-side blowing produced the most favorable result. E Transonic turbine experiments are planned to assess predictive accuracy for the baseline turbine and any design improvements.
Clark, John (Air Force Research Lab. United States)
August 24, 2013
February 1, 2010
Publication: Minnowbrook VI: 2009 Workshop on Flow Physics and Control for Internal and External Aerodynamics