Experimental Study to Investigate Effect of Pitch Ratio and Number of Blades on Hydrodynamic Performance of Surface Piercing Propellers

A. Yousefi, R. Shafaghat, M. Beykani, A. Aghajani Afghan, S. T. Seyyed Mostafa
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Abstract

Surface piercing propellers are special supercavitation propellers operating at free surface. These propellers are designed to have the best performance at the highest speed. The geometric parameters of the number of blades and the pitch ratio will significantly impact the critical advance coefficient range, ventilation and consequently the hydrodynamic performance of the propeller. Therefore, in this paper, the effect of two crucial parameters of pitch ratio and number of blades were experimentally studied in free surface water tunnel. After calibration and evaluation of uncertainty, two 5-bladed propellers with same section profile and pitch ratio of 1.5 and 1.4 used to investigate effect of pitch ratio. The results of two 5-blade and 6-blade propellers with same section profile and pitch ratio of 1.4 were compared. The immersion ratio was 40%, and the shaft inclination angle was zero. Results showed that increasing the pitch ratio increased the thrust and torque coefficients by 30%; while increasing the critical advance coefficient. Consequently led to the development of a full ventilation range and improved hydrodynamic performance of the propeller. the number of blades, values greater than the critical advance coefficient, the thrust and torque coefficients were increased by 10%. the critical advanced coefficient changes were negligible. Comparing the results in the three-dimensional contours showed that with the change in the number of blades, by increasing the pitch ratio, the critical advance coefficient increased; which led to a further increase in efficiency.
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桨距比和桨叶数对面穿刺螺旋桨水动力性能影响的实验研究
表面穿洞螺旋桨是一种在自由表面工作的特殊超空泡螺旋桨。这些螺旋桨被设计成在最高速度下具有最佳性能。桨叶数和桨距比等几何参数对螺旋桨的临界推进系数范围、通风量以及水动力性能有重要影响。因此,本文在自由地表水隧道中,对桨距比和叶片数这两个关键参数的影响进行了实验研究。在标定和不确定度评定后,采用相同截面型、节距比分别为1.5和1.4的两种5叶螺旋桨,研究节距比的影响。比较了相同截面型线、节距比为1.4的5叶和6叶两种螺旋桨的效果。浸没比为40%,轴倾角为零。结果表明:增大节距比可使发动机的推力和扭矩系数提高30%;同时增加临界超前系数。从而导致了全通风范围的发展和螺旋桨的水动力性能的提高。叶片数大于临界推进系数时,推力和扭矩系数提高了10%。临界超前系数变化可以忽略不计。在三维轮廓线上对比结果表明,随着叶片数的变化,增大桨距比,临界推进系数增大;这进一步提高了效率。
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