关键词: 涡轮喷气发动机;收敛喷管;发动机性能参数;发动机试验

Abstract: A preliminary research on characteristics of two-dimensional convergent nozzles is conducted. The exhaust pipe of Jet-Engine WP-6 is employed in the research comparing with the axisymmetric nozzle with fixed exit area,a engine fitted with the 2-D convergent nozzle whose exit area can be adjusted within a certain range is tested. The result shows that ① the exit area of the exhaust sensitively effect the thrust,and the decrease in the thrust doesn’t exceed 1. 0% generated by the engine fitted with the 2-D nozzle which has the same exit area as the axisymmetric one,but the fuel-consumption rate increases by 0. 7% at the maximum engine rpm;② the ability for the fluid to pass through the transition duct and convergent rectangular pipe has to some extent been strengthened by the axial vortex generated by the turbine. Therefore, the 2-D nozzle has technical potentiality and application prospect of designing advanced fighters.

Key words: Turbojet engine;Convergent nozzle;Motor performance parameter;Engine test