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基于求解三维Reynolds-averaged Navier-Stokes方程,数值模拟了着陆襟翼打开状态下抓斗式反推装置工作时流场分布特性.网格采用非结构化四面体与六面体混合分区生成技术,湍流模型选用Spal-art-Allmaras模型.结果表明,在计算滑跑速度范围内,反向排气流不会被进气道重新吸入;高温反向排气流会冲击到飞机吊挂及部分机翼,需引起注意;随着滑跑速度的降低,反向排气流侧向影响范围急剧增大,若机翼后掠角较大,则反向排气流容易被相邻发动机再次吸入,引起进气畸变;当滑跑速度降低到34 m/s时,反向流开始吹向地面,可能会卷起地面颗粒物并且被进气道吸入;随着滑跑速度的降低,反推力减小.
Based on solving the three-dimensional Reynolds-averaged Navier-Stokes equations, the numerical simulation of the flow field distribution during the operation of the grab type thrust reverser with the landing flaps open is presented. The grid uses unstructured tetrahedron and hexahedron mixed-partition generation techniques, turbulence model The Spal-art-Allmaras model is selected.The results show that the reverse exhaust flow will not be re-inhaled by the intake passage within the range of calculating the run-off speed.High temperature reverse exhaust flow will impact the aircraft suspension and some of the wings, It is necessary to pay attention to it. With the decrease of the running speed, the lateral influence range of the reverse exhaust flow increases sharply. If the sweep angle of the airfoil is larger, the reverse exhaust flow is easily inhaled by the adjacent engine again, Gas distortion. When the run-down speed is reduced to 34 m / s, the reverse flow begins to blow to the ground, which may roll up the ground particles and be sucked into the air intake. As the run-down speed decreases, the thrust force decreases.