Accession Number : AD0733738

Title :   Nacelle Cowling of High Bypass Ratio Turbofan Engines,

Corporate Author : BOEING CO RENTON WASH AIRPLANE DIV

Personal Author(s) : Lawrence,Robert L.

Report Date : 1971

Pagination or Media Count : 39

Abstract : Consideration of mission factors for subsonic transports has led to selection of high bypass turbofan engines. The proper integration of these engines with the airframe requires knowledge of the propulsive force supplied to the aircraft by the engines. The propulsive force may be determined by experimentally evaluating the thrust or drag of the various parts of the engine cowling, and synthesizing the nacelle drag by adding together the component drags. Accurate experimental results are difficult to obtain. The synthesis of component drags ignores interactions between components. Consequently analytical tools are being developed to calculate the drag and thrust. Suggested analysis techniques include incompressible and compressible inviscid and boundary layer flows. Advances in calculation techniques are needed for compressible flows, separated flows, and interference effects. (Author)

Descriptors :   (*TURBOFAN ENGINES, PERFORMANCE(ENGINEERING)), (*JET ENGINE NACELLES, TURBOFAN ENGINES), THRUST, AIRFRAMES, DRAG, BOUNDARY LAYER, INCOMPRESSIBLE FLOW, COMPRESSIBLE FLOW

Subject Categories : Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE