INVESTIGATIONS TOWARD THE DEVELOPMENT OF AN AERODYNAMIC STRIP ANALYSIS FOR SINGLE ROTATION PROPELLERS OPERATING AT LOW AIRSPEEDS AND/OR LOW ADVANCE RATIOS

摘要

The current interest in VTOL and STOL aircraft has placed renewed emphasis on the development of accurate methods for the prediction of propeller blade loading and performance at low airspeeds and/or low advance ratios. This report describes investigations made toward development of a single rotation aerodynamic strip analysis for use with propellers or "rotor propellers" operating under these conditions. A double iterative flow field treatment was developed, from Theodorsen's basic work, which accounts for both wake displacement velocity and wake slipstream contraction and the analysis programmed for solution on a high speed digital computer. Fornsimplification flight is considered under conditions of axial flow normal to the actuator disc.