直翼推进器的理论研究

利用二维机翼理论对直翼推进器水动力性能进行探讨,研究中考虑了由于叶片的非定常运动引起的下泄涡之间,下泄涡与附着涡以及附着涡之间的相互干扰作用.对不同叶数、偏心率、进速系数时的直翼推进器的推力、扭矩进行了计算.计算结果表明在大进速比时与实验值吻合得很好;在和未考虑涡系干扰作用的三维机翼理论计算结果比较时,对于叶数较少的情况,两者计算精度相当,在叶数较多的情况,本理论计算精度有明显改善).

Theoretical Computational Method for Cycloidal Propellers

A theoretical analysis of cycloidal propeller was developed for the two-dimensional method (infinite blade aspect ratio),In this method the interference of wake with blades, the interference blades of with wake,and mutual interference of blades are considered, A com puter program has been developed to predict the thrust and torque of cycloidal propeller, Comparing calculating results with model propeller data,it is shown that the agreement between them is quite good with larger advance coefficients.Comparisons with three-dimensional method without considering vorticc interference indicate that good agreement is obtained with propellers of less blades.