CAJ | 학술논문

应用有限体积方法求解三维可压缩雷诺平均N-S方程,对76° 后掠角三角翼作大迎角俯仰运动时的动态气动力系数进行计算,研究三角翼以不同频率进行大迎角俯仰振动和在不同迎角范围内进行俯仰振动的非定常气动力系数变化特征,对减缩频率和振动所在的迎角范围对三角翼动态非定常气动力迟滞特性的影响进行分析.计算结果表明,在三角翼作大迎角俯仰谐振荡过程中,升力、阻力和俯仰力矩系数曲线都形成明显的滞环,且随着减缩频率增加,所产生的迟滞特性明显增强;在同一减缩频率下,三角翼在较大迎角范围内作周期振动时,所表现的迟滞特性明显不同.
응용유한체적방법구해삼유가압축뢰낙평균N-S방정,대76° 후략각삼각익작대영각부앙운동시적동태기동력계수진행계산,연구삼각익이불동빈솔진행대영각부앙진동화재불동영각범위내진행부앙진동적비정상기동력계수변화특정,대감축빈솔화진동소재적영각범위대삼각익동태비정상기동력지체특성적영향진행분석.계산결과표명,재삼각익작대영각부앙해진탕과정중,승력、조력화부앙력구계수곡선도형성명현적체배,차수착감축빈솔증가,소산생적지체특성명현증강;재동일감축빈솔하,삼각익재교대영각범위내작주기진동시,소표현적지체특성명현불동.
Three-dimensional Reynolds averaged Navier-Strokes numerical simulations were carried out to predict the flow field characteristics of a 76° swept delta wing undergoing a pitch motion at high angle of attack. The Baldwin-Lomax eddy viscosity model with the modifications suggested by Degani and Schiff was used here. Three cases were considered to investigate the frequency effect on the aerodynamic loads for the delta wing. And the unsteady aerodynamic loads for the delta wing which oscillate at different range of angle of attack are also shown in the paper. It is concluded that the aerodynamic loads show a hysteresis circle when the delta wing oscillates in pitching, and the hysteresis phenomenon is more distinct when the frequency becomes faster. The hysteresis circles are changed clearly when the delta wing oscillates at large range of angle of attack.