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在分析西北地区中部航空器飞行实例的大尺度环流背景基础上,对一个颠簸物理量场特征模型的适用性进行了研究验证和分析,结果表明,飞机颠簸产生在气压梯度相对较大且存在气旋性切变的环境中,颠簸区恰是正负垂直速度的转换区,梯度密集区吻合飞机实际发生颠簸的区域,也即垂直P速度由均匀场变换为非均匀场,与共性特征研究结果一致。颠簸出现在冷性和暖性平流交汇且靠近暖性平流侧。不稳定的冷暖平流垂直配置及正涡度平流输送造成局地性涡度增加,使上升运动加强,局部垂直环流发展,加剧颠簸程度。飞机发生颠簸的区域出现流场的间断线,同时间断线处上升气流与下沉气流共存是造成飞机难以操控的主要原因。流线分布状况的辨析为飞机颠簸的分析和预警服务带来新思路。
Based on the analysis of the large-scale circulation background of aircraft flight cases in the central Northwest China, the applicability of a jounce physical field feature model is verified and analyzed. The results show that the aircraft bumpy occurs when the pressure gradient is relatively large and the cyclone In the changing environment, the bumpy zone is just the transition area of positive and negative vertical velocities, and the gradient-intensive areas are consistent with the actual bumpy areas of the aircraft. That is, the vertical P velocity changes from the uniform field to the non-uniform field, which is consistent with the common features. Bumps appear at cold and warm advections and close to warm advection. Unstable vertical distribution of cold and warm advection and positive vorticity advection caused by local vorticity increase, so that the rising movement, the development of local vertical circulation, exacerbating the degree of turbulence. The intermittent flow field appeared in the bumpy area of the aircraft and the coexistence of ascending air and downdraft air at the time of disconnection was the main reason that made the aircraft difficult to control. The analysis of streamline distribution brings new ideas to the analysis and warning services of aircraft bumps.