方形截面飞行器上仰机动对滚转特性影响的数值模拟

doi:10.7527/S1000-6893.2016.0150

Abstract

Abstract:

The vortex of the flow separation at the leeward site is varying momently as the vehicle pulls up to high angles of attack, which may induce strong unsteady effect of aerodynamics and additional lateral aerodynamics. The vehicle is pulled up rapidly from level-off to high angle of attack flight in the nose-up process, which may has prominent effect on the lateral aerodynamics and the rolling motion. To study the unsteady effect of aerodynamics and its influence to rolling characteristics, the loose couple technique of rigid body dynamic equations and Navier-Stockes equations was developed. The established loose couple technique was then validated by simulating the 6-degree of freedom trajectory of debris shedding from the space shuttle. Taking the square cross section vehicle as example, the steady rolling aerodynamic characteristics, free rolling characteristics and the effect of nose-up process at different speeds to rolling characteristics of the aircraft were studied. The results showed that there was a critical attack angle about 13° existing in the free rolling motion, when the attack angle was greater than the critical attack angle, the vehicle was in rapid rolling motion, and when the attack angle was lower than the critical attack angle, the rolling motion was stable. While in the nose-up process, the rolling characteristics were also affected by the pulling velocity, the vehicle could be in rapid rolling motion under the slow pulling speed even the final attack angle was greater than the critical attack angle.

Key words: 6-degree of freedom, loose couple, rapid nose-up, square cross section vehicle, rolling motion, unsteady numerical simulation

CLC Number:

V211.3

CHEN Jianqiang, CHEN Qi, YUAN Xianxu, XIE Yufei. Numerical simulation of rolling characteristics in nose-up process of square cross section vehicle[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016, 37(8): 2565-2573.

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Numerical simulation of rolling characteristics in nose-up process of square cross section vehicle

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