Relation between spark-ignition engine knock, detonation waves, and autoignition as shown by high-speed photography /
Cearcy D. Miller.

Description

Main Author

Miller, Cearcy D.

Related Names

Branstetter, J. Robert.
Aircraft Engine Research Laboratory.
United States. National Advisory Committee for Aeronautics.

Language(s)

English

Published

Washington, D.C. : National Advisory Committee for Aeronautics, [1946]

Subjects

Schlieren photography.
Photography.
Detonation waves.
Combustion.
Schlieren photography.
Photography.
Detonation waves.
Combustion.

Summary

A critical review of literature bearing on the autoignition and detonation-wave theories of spark-ignition engine knock and on the nature of gas vibrations associated with combustion and knock results in the conclusion that neither the autoignition theory nor the detonation-wave theory is an adequate explanation of spark-ignition engine knock. A knock theory is proposed, combining the autoignition and detonation-wave theories, introducing the idea that the detonation wave develops in autoignited or afterburning gases, and ascribing comparatively low-pitched heavy knocks to autoignition but high-pitched pinging knocks to detonation waves with the possibility of combinations of the two types of knock.

Note

Prepared at the Aircraft Engine Research Laboratory, Cleveland, Ohio.
Originally issued as NACA as Advance Restricted Report E6C22 (April 1946).
NACA Wartime Report E-238.

Physical Description

52, [15] p. : ill. ; 27 cm.

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