Accession Number : ADA326995
Title : Sonic Nozzles for Mass Flow Measurement and Reference Nozzles for Thrust Verification (Les Tuyeres Soniques Pour le Controle du Debit Massiquie et les Tuyeres de Reference Pour la Verification de la Poussee).
Corporate Author : ADVISORY GROUP FOR AEROSPACE RESEARCH AND DEVELOPMENT NEUILLY-SUR-SEINE (FRAN CE)
PDF Url : ADA326995
Report Date : JUN 1997
Pagination or Media Count : 86
Abstract : Accurate measurement of massflow and thrust is essential to the success of windtunnel tests supporting engine-airframe aerodynamic integration studies. Among other benefits, optimising engine integration results into reductions of the cruise drag of an aircraft by at least several percent. Hence, mastering this technique at an early stage of a project allows, within a given set of specification (e.g. the range), to save on the mass of the aircraft and consequently on its cost - more generally it contributes to reducing technical/economical risk. Refinement of experimental techniques contributing to cruise drag prediction, and possibilities offered by small scale engine simulators are today somewhat limited by the accuracy of massflow and thrust measurements on reference nozzles, which have to be used at various stages of the experiments. Indeed, determining thrust-drag balance with an accuracy better than one percent often requires subtracting large quantities which need to be known individually within a few thousandths. This is today still difficult to do, even in the simple case of reference nozzles. Moreover, within cooperative programmes, systematic interfacility bias resulting from slight differences in test methodology can raise complex issues for the partners.
Descriptors : *MEASUREMENT, *VERIFICATION, *MASS FLOW, *NOZZLES, *THRUST, SIMULATORS, NATO, AIRCRAFT, RISK, PREDICTIONS, AIRCRAFT ENGINES, SPECIFICATIONS, TEST METHODS, COSTS, INTEGRATION, AIRFRAMES, ENGINES, ACOUSTICS, CALIBRATION, FLUID DYNAMICS, DRAG, REFINING, VISCOSITY, WIND TUNNELS, NOZZLE THROATS, AERODYNAMICS, VENTURI TUBES.
Subject Categories : Aerodynamics
Distribution Statement : APPROVED FOR PUBLIC RELEASE