Propeller-Induced Velocity Field due to Thickness and Loading Effects.

摘要

Blade thickness palys a dual role,contributing to the lifting characteristics of the blade because of its nonplanar form as well as to its non-lifting characteristics due to the generation of a symmetrical flow disturbance. However,since the so-called 'nonplanar thickness'has been shown to have little effect on the flade pressure distribution and thus presumably to have a negligible effect on the velocity and pressure field around an operating propeller,the present investigation is limited to the so-called 'symmetrical flow disturbance thickness'. The effect of this thickness on the vibratory velocity field around the propeller is studied by means of the 'thin body'approach,where the blade section is represented by a source-sink distribution of strength proportional to the slope of the blade thickness distribution. (Modified author abstract)