이동변형격자 기법을 활용한 외부장착물 분리운동 해석

Abstract

A military aircraft generally includes external stores such as fuel tanks or external arming,depending on the purpose of the operation. When a store is dropped from a militaryaircraft at high subsonic, transonic, or supersonic speeds, the aerodynamic forces andmoments acting on the store can be sufficient to send the store back into contact with theaircraft. This can cause damage to the aircraft and endanger the life of the crew. In thisstudy, time accurate computational fluid dynamics (CFD) with dynamic moving grid(moving and deformable mesh, MDM) technique has been used to accurately calculate storetrajectories. For the verification of the present numerical approach, a wind tunnel test modelfor the wing-pylon-finned store configuration has been considered and analyzed. Thecomparison results for the ejected store trajectories between the present numerical analysisand the wind tunnel test data at the Mach number of 0.95 and 1.2 are presented. It is alsoimportantly shown that the numerical parameter of MDM technique gives significant effectfor the calculated store trajectory in the low-supersonic flow such as Mach 1.2.