Application of Semi Rigid Trailing to Ram Air Turbine Performance Calculating
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摘要: 与Goldstein假设一致的刚性尾涡是螺旋桨升力线(面)计算中的常用模型,适于轻负荷工况,但在较大负荷工况时则有一定的误差.与Theodorsen假设一致的半刚性尾涡将Goldstein尾涡推广至较大负荷工况.对Theodorsen尾涡模型应用于冲压空气涡轮升力线计算进行了探讨,对一个模型冲压空气涡轮作了计算,给出了涡距、诱导速度、环量及叶素风能利用系数,其分布趋势合理,风能利用系数与实验值符合的较好.Abstract: Rigid trailing vortex model consistent with Goldstein hypothesis is often employed in propelles lifting line (lift surface) calculation on the condition of light load,but presents certain errors on the condition of heavy load.Semi rigid trailing vortex model consistent with Theodorsen hypothesis extents Goldstein trailing vortex to heavy load condition.Application of Theodorsen trailing vortex model to ram air turbine lifting line calculation is discussed.A model ram air turbine has been employed to calculate.The results show reasonable distributions of trailing vortex pitch,induced velocities,circulations and blade element wind power utilization coefficient.Wind power utilization coefficient agrees well with experiments.
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Key words:
- ram air turbine /
- trailing vortex /
- lifting line
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1. 张剑锋,刘思永.冲压空气涡轮性能的局部改进的升力线算法,北京航空航天大学学报,1997,22(4):482~486 2. Sullivan J P.The effect of blade sweep on propeller performance.AIAA77 716,1977 3. Theodorsen J.Theory of propellers.New York:McGraw Hill,1948 4. Chiu Y D,Peters D A.Numerical solution of induced veocities by semi infinite tip vortex lines.J Aircr,1988,25(8):684~694 -
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