Modification of Jindivik Air Intake Duct with an Auxiliary Intake - Static Aerodynamic Tests.

摘要

Results are presented for an R and D program to improve the take-off performance of the Jindivik target aircraft. The engine air intake duct of Jindivik is aerodynamically optimised for altitude and high subsonic cruise, and scope for its modification, for improved performance at take-off, was limited to the incorporation of an auxiliary intake system which is deployed only during take-off and is closed in flight. The auxiliary intake concept was explored experimentally with a 1/4 model scale of Jindivik air intake duct, and involved both static testing and tests with forward speeds in the wind tunnel. This report covers the aerodynamic aspects of the static phase of the program, at which conditions substantial improvements in pressure recovery with acceptable levels of flow distortion at the engine face have been demonstrated for simple intake modifications.