Accession Number : ADA292801

Title :   Terminal-Shock and Restart Control of a Mach 2.5, Mixed-Compression Inlet Coupled to a Turbofan Engine.

Descriptive Note : Technical memo,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CEN TER

Personal Author(s) : Baumbick, Robert J. ; Batterton, Peter G. ; Daniele, Carl J.

PDF Url : ADA292801

Report Date : AUG 1974

Pagination or Media Count : 19

Abstract : Results of an experimental program conducted on a mixed-compression inlet coupled to a turbofan engine are presented. Open-loop frequency response data are presented that show the response of shock position (as measured by an average inlet static pressure) to sinusoidal airflow disturbances produced at the compressor face station. Also presented are results showing the effect of different passive terminations (a choke plate or a long duct) on the characteristics of the inlet. Transfer functions obtained by using experimental data are presented and compared to the experimental data. Closed-loop frequency response of shock position (with a proportional-plus-integral controller) is presented. In addition, transient data are presented that show the unstart-restart characteristics of the inlet.

Descriptors :   *TURBOFAN ENGINES, *INLETS, CONTROL, STATIONS, TRANSIENTS, POSITION(LOCATION), EXPERIMENTAL DATA, TRANSFER FUNCTIONS, PASSIVE SYSTEMS, RESPONSE, SHOCK, DUCTS, RESTARTING, OPEN LOOP SYSTEMS, STATIC PRESSURE, FREQUENCY RESPONSE, CLOSED LOOP SYSTEMS, FACINGS.

Subject Categories : Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE