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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

Simplified Theory for Dynamic Relation of Ramjet Pressures and Fuel Flow

Description: Memorandum presenting an analysis to determine, for control design purposes, the approximate response of pressures in the ramjet engine to changes in fuel flow. In the first part, the response after dead time is treated by the linearized lumped-parameter method. In the second, the dead time occurring between the change in fuel flow and the beginning of the pressure response is discussed.
Date: October 21, 1957
Creator: Hurrell, Herbert G.
Partner: UNT Libraries Government Documents Department