Vaneless Counter-Rotating Turbine (VCRT) is taken as an important component technique to greatly improve the performance of aircraft engine. However design problems involved in a practicable VCRT is far from being resolved. Based on previous studies, the design process of a VCRT for cold-air test is presented. The design target is for practical use. The design is based on iterations between airfoil blading and numerical analysis of 3D steady viscous flow. Results indicate the performance of VCRT might be proper for practical use. To investigate the control problem in engines that use this type of VCRT, variable vane is tested numerically. Off-design operations are also simulated. The engine with the VCRT shows severe control problems. Variable vane and changing exhaust nozzle area may be two selectable ways.

This content is only available via PDF.
You do not currently have access to this content.