基于直升机安全起降条件的城区建筑流场分析

Analysis Simulation of Urban Building Flow-field based on the Safety Conditions of Helicopter Taking Off and Landing

采用数值模拟方法得到了典型城区建筑模型附近的流场,结合直升机安全起降条件,分析了不同风速条件和建筑尺寸对建筑附近流场以及直升机城区起降的影响。结果表明,影响直升机起降的建筑附近流场危险紊流区范围与来流速度、建筑尺寸等参数成正比,直升机在城区选择起降地点时应尽量规避建筑顶部及尾流区的局部危险紊流区。最后,根据城区建筑附近流场的特点为直升机在城区安全起降及飞行提出了建议。

The flow-field of typical urban building area was obtained by numerical simulation method. Helicopter taking off and landing conditions were concerned to analyze the influence of different weather factor（ wind velocity） and the size of building on the urban helicopter taking off and landing. Results showed that the dangerous range of turbulent flow area near the urban building,which had influence on helicopter taking off and landing,was basically direct ratio to the wind speed and building size. We should avoid the dangerous range of turbulent flow in the top and wake region of building when helicopter choose landing location in urban area. Finally,according to the flow feature near the urban building,some suggestion were given to the select of flight trace.