Estimates for Hydraulic Efficiency and Blade Characteristics for Preliminary Pumpjet Design Exercise.

摘要

A method is given for predicting hydraulic efficiency of a pumpjet as a function of ingested mass flow. This method is presented for a conventional pumpjet which has a stator aft of the rotor and a preswirl pumpjet which has a stator forward of the rotor. The approach uses mass averaged values of flow quantities to detemrine blade geometries and operating characteristics at a blade radius that is representative of the average energy input of the blade row. The space-to-chord ratio, lift coefficients, stage efficiency, and overall efficiency of the pumpjet is computed for a given vehicle as a function of advance ratio. (Author)