COLD-AIR PERFORMANCE OF FREE POWER TURBINE DESIGNED FOR 112-KILOWATT AUTOMOTIVE GAS-TURBINE ENGINE Ⅱ - EFFECTS OF VARIABLE STATOR-VANE-CHORD SETTING ANGLE ON TURBINE PERFORMANCE

摘要

The cold-air performance of an axial-flow power turbine with a variable stator designed for a 112-kW automotive gas-turbine engine was determined at speeds from 30 to 110 percent of design and at pressure ratios from 1.11 to 2.67. Performance is presented in terms of equivalent mass flow, torque, power, and efficiency for stator-vane-chord setting angles of 26 , 30 , 35 (design), 40°, 45°, and 50°. Turbine braking performance at a nominal stator setting angle of 107° is also presented. Turbine efficiency increased with increasing stator setting angle. A 10-point efficiency increase was obtained by opening the stator from the design setting angle of 35° to a setting angle of 45.