期刊名称：International Journal of Innovative Research in Science, Engineering and Technology
印刷版ISSN：2347-6710
电子版ISSN：2319-8753
出版年度：2015
卷号：4
期号：2
页码：442
DOI：10.15680/IJIRSET.2015.0402031
出版社：S&S Publications
摘要：Propulsive efficiencies of Micro Air Vehicle propellers over operating range is playing very importantrole in enhancing the endurance of the MAVs. These propellers are powered by brushless mini motors whoseefficiencies are low in comparison to bigger size motors and are varying over a range of operation. Generallypropulsive efficiencies are evaluated by measuring the input power of drive motor and its efficiencies from commercialcatalogue. Uncertainty in propulsive efficiency estimation results from the uncertainty in motor efficiencies which varywith load, speed; local heating of the miniature motors, and also compounded by uncertainty in low velocity air flowmeasurements. To alleviate this, novel method of simultaneous measurement of propellers shaft torque, thrust androtational speed is configured by CSIR-NAL and procured from M/s MAGTROL SA, Switzerland along with thecomputer controlled data acquisition system. Wind tunnel testing in uninstalled condition, measurement techniques anddata analysis method adapted has yielded realistic assessment of propulsive efficiencies of mini propellers used inmicro air vehicles. Maximum propulsive efficiencies of 70% are measured at advance ratio of 0.65 in comparison to58% from earlier method for 6inch 3bladed mini propeller and computed values of 3D steady state CFD analysis usingANSYS FLUENT are closer to measured values.
