Instrumentation for recording transient performance of gas-turbine engines and control systems Page: 2 of 29
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NASA Technical i I
NACA RM E51D27 3 1176 01435 2331
NATIONTIONAL ADVISORY COMMITTEE FOR AERONAUTICS
INSTRUMENTATION FOR RECORDING TRANSIENT PERFORMANCE OF GAS-
TURBINE ENGINES AND CONTROL SYSTEMS
By Gene J. Delio and Glennon V. Schwent
Design features are presented for the instrumentation used in a
study of the transient performance of gas-turbine engines and control
systems. The dynamic characteristics of the instrumentation are
discussed and examples are given.of typical data on the acceleration
of a controlled and an uncontrolled engine.
The measurement and the recording of the transient behavior of
gas-turbine engines have become increasingly important in many fields
of research. Accurate measurement of engine transient performance is
especially important in the field of automatic-controls research in
order to provide the knowledge of engine dynamic characteristics
necessary for control synthesis. Accurate measurements are also
needed in the study of control-system behavior and in the determination
of such engine transient limitations as compressor stall and burner
blow-out. The engine transients encountered in this work can be
accurately recorded only with instruments possessing good dynamic
response. The technique of recording engine transient performance
with a photopanel and a motion-picture camera is inadequate because
of the poor response characteristics of the instruments and because
considerable labor is required to transcribe the data from the film
into the usable form. The data recorded on film are, furthermore,
not immediately available for study, a disadvantage that is important
in large test facilities, such as an altitude wind tunnel. Special
instrumentation and recording methods have accordingly been developed
at the NACA Lewis laboratory as a necessary part of control-systems
The problem of recording engine transients has several aspects:
First, a recording system is needed that is capable of inking wave
forms of transients directly on a moving paper chart and that possesses
linear phase shift together with flat frequency response; second,
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Delio, Gene J. & Schwent, Glennon V. Instrumentation for recording transient performance of gas-turbine engines and control systems, report, June 27, 1951; (digital.library.unt.edu/ark:/67531/metadc58827/m1/2/: accessed December 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.