• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Aircraft >Eulerian Simulation of the Fluid Dynamics of Helicopter Brownout
【24h】

Eulerian Simulation of the Fluid Dynamics of Helicopter Brownout

机译：直升机停电的流体动力学的欧拉模拟

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A computational model is presented for simulating the development of the dust cloud that can be entrained into the air when a helicopter is operated close to the ground in dusty conditions. The physics of this problem and the associated condition known as brownout, where the pilots lose situational awareness as a result of their vision being occluded by dust suspended in the flow around the helicopter, are very complex. The approach advocated here involves an approximation of the full dynamics of the coupled particulate-air system. Away from the ground, the model assumes that the suspended particles remain in near equilibrium under the action of aerodynamic forces. Close to the ground, this model is replaced by an algebraic sublayer model for the saltation and entrainment process. The model is used to analyze the differences in the geometry and extent of the dust clouds that are produced by single main rotor and tandem-rotor configurations as they decelerate to land and shows that the location of the ground vortex and the size of any regions of recirculatory flow, should they exist, play a primary role in governing the extent of the dust cloud that is created by the helicopter.
机译：提出了一种计算模型，用于模拟当尘土飞扬的直升机在接近地面的情况下可带入空中的尘埃云的发展。这个问题的物理现象和相关的状况称为停电，由于飞行员的视力被直升机周围气流中悬浮的灰尘所遮挡，飞行员失去了态势感知，这是非常复杂的。这里提倡的方法涉及耦合的颗粒空气系统的全部动力学的近似值。远离地面，该模型假设悬浮颗粒在空气动力的作用下保持接近平衡。在地面附近，此模型被代入盐分和夹带过程的代数子层模型替代。该模型用于分析单个主旋翼和串联旋翼构型减速降落时产生的尘埃云的几何形状和范围的差异，并显示出地面涡旋的位置以及尘埃云的任何区域的大小再循环流（如果存在）在控制直升机产生的尘埃云的范围方面起主要作用。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号