摘要
基于叶素理论和儒可夫斯基涡流理论,通过求解螺旋桨合成速度、速度环量及诱导速度的非线性方程组,分析了高度为20 km的临近空间中桨叶数目、桨径长度、旋转速度及前进速度对螺旋桨气动性能的影响。结果显示:诱导速度、拉力、扭矩沿桨径的分布规律都是先增大后减小;螺旋桨拉力随桨径长度、旋转速度的增大而增大,随前进速度的增大先增大后减小且峰值在0.45 Ma左右;螺旋桨效率随桨叶数、桨径长度和旋转速度的增大而减小,随前进速度的增大先增大后减小且峰值在0.1 Ma左右。
The effect of screw numbers,screw length,screw rotate speed and fly velocity to the propeller aerodynamics characteristic in the near space at 20 km altitude was studied by solve the non-linear equations of compound speed and velocity vortex and induced flow velocity based on the blade element theory and vortex theory.The result showed that,as the radius extend,the distributing of the induced flow velocity was increased first and then decreased,the thrust of the propeller and the torque of the propeller has the same distributing.The thrust of the whole propeller would increase as the screw length and screw rotate speed increased,the thrust of the whole propeller would increase first and then decrease as the fly velocity increased and there was a peak value at 0.45 Ma.The propeller efficiency would decrease as the screw numbers and screw length and screw rotate speed increased,the propeller efficiency would increase first and then decrease as the fly velocity increased and there was a peak value at 0.1 Ma.
出处
《直升机技术》
2011年第3期8-13,共6页
Helicopter Technique
