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Evaluation of three methods for determining dynamic characteristics of a turbojet engine

Description: Report presenting transient data from approximate step and sinusoidal disturbances of fuel flow on a turbojet engine operated at one constant simulated altitude and flight condition. Results regarding coefficients of differential equations, Fourier representation, frequency response, transient analysis, and a comparison of the various analytical methods are provided.
Date: February 1952
Creator: Delio, Gene J.
Partner: UNT Libraries Government Documents Department

Experimental investigation of a surge control on a turbojet engine

Description: The action of a surge control that reduced fuel flow after receiving an indication of surge initiation was investigated. The control system could successfully limit surge to only 1 cycle but could not completely eliminate surge. Inability to interrupt a surge cycle before its completion was attributed to the conclusion that a surge cycle is irreversible.
Date: November 18, 1955
Creator: Novik, David; Heppler, Herbert & Stiglic, Paul M.
Partner: UNT Libraries Government Documents Department

Experimental investigation of an overriding control to effect recovery from surge and stall in a turbojet engine

Description: The override was designed to automatically recover the engine from stall and surge by reducing fuel flow and then increasing fuel flow in a manner to avoid repeated stalls and surges and successfully complete the acceleration. One of two parameters was used to operate the override, tailpipe temperature, or the derivative of compressor-discharge pressure. The override operating with tailpipe temperature recovered the engine from stall and surge. Operating on compressor-discharge-pressure derivative, the override recovered the engine from surge, but failed when stall was encountered.
Date: October 29, 1956
Creator: Stiglic, Paul M. & Heppler, Herbert
Partner: UNT Libraries Government Documents Department