EFFECT OF ROTATION OF AN NACA 1-SERIES E-TYPE COWLING ON THE INTERNAL FLOW AND FORCE CHARACTERISTICS OF THE COWLING AT MACH NUMBERS UP TO 0. 84 AND AT AN ANGLE OF ATTACK OF 0°

摘要

An investigation has been conducted to determine the effect of rotation on the internal flow and force characteristics of an NACA 1-series E-type cowl, designed to operate with a four-blade singlerotation propeller. Pressure recovery, internal flow angle, cowl-gap and duct flow, thrust, and torque were measured for the cowling without a propeller at Mach numbers from 0.20 to 0.84, inlet velocity ratios from 0ol9 to 0.93， and advance ratios (based on a model propeller diameter of k- feet, equivalent to a ratio of cowl diameter to propeller diameter of 0»29) from 0.75 to 5.06 Included are results of surveys of the local velocity distribution in the propeller plane. All tests were conducted with the model, without a propeller, at an angle of attack of 0° and at a Reynolds number of 1.72 million, based on the maximum diameter of the cowl。