旋翼诱发砂尘环境及其对直升机的危害

 用直升机模型进行试验研究,制造了“直升机”在地面附近不同高度悬停及不同桨盘载荷下诱发砂尘环境,考察了旋翼诱发砂尘对直升机的实际危害,测定了某些指定部位的砂尘浓度与作用力及砂尘粒度分布情况。理论分析,计算了机身周围旋翼诱导流场,并经实验检验了直升机旋翼诱发砂尘浓度、粒度分布规律及作用力的近似估算方法。

A STUDY ON ROTOR INDUCED SAND AND DUST ENVIRONMENT AND ITS HARMFULNESS TO HELICOPTER

An experimental study and theoretical analysis on rotor induced sand and dust environment and its harmfulness to helicopter are briefly described in this paper. The experimental study has been made by using a helicopter model which consists of rotor and fuselage models. The induced sand and dust environment is established around the helicopter model hovering at different height near the ground and having different rotor disc loading. The real harm of sand and dust generated by rotor downwash to helicopter was observed and studied. The sand and dust concentration, forces and particle size distribution are measured at some designated locations on (or near) the helicopter. The flow field of the rotor downwash around the helicopter is theoretically analyzed and its velocity is calculated and tested. The law of induced sand and dust concentration, particle size distribution, arid the method of estimating the forces are given from the research results.