Similarity Calculation of Propeller under Medium Speed Flight Condition

Abstract

Because of higher Mach number on cruise stage, compressibility effect has a large influence on induced losses. Thus, at this point, various vortexes behind the rotor plane may strongly altered induced velocity field on the blade which is quite different from low-speed propeller and cannot be neglected. Meanwhile, under similar conditions, this paper makes full analysis on the impact that how tip induced losses gives a change on the thrust and available power on the two couple similar propellers. Then, we can get the prediction of real cruise state on the proportion of induced losses in the research of propeller. The results showed that the propeller tip induced loss characteristics was not only related to the actual geometric distribution, but also had the correlation with the specific operational conditions, especially advanced ratio and pitch angle, which had the most obvious impact on this loss characteristics. Finally, this study illustrates that this manner adopted can be used for the design, experiment and theoretical analysis of actual propeller under certain conditions.