Numa Manson on Velocity Deficits and Detonation Stability – An Invited Memorial Lecture Presented at ICDERS 21


  1. Murray, S.B.
Corporate Authors
Defence R&D Canada - Suffield, Ralston ALTA (CAN)
This memorial paper pays tribute to Professor Numa Manson’s contributions to the understanding of detonation velocity deficits and wave stability. Manson and his colleague Guénoche postulated that a velocity deficit exists in a tube because the chemical reactions are inhibited in a thin layer adjacent to the tube walls. The hydrodynamic theory of detonationwas modified to account for this, and itwas shown that the deficit varies inversely with the tube diameter. Manson and his students measured detonation velocities in tubes of various diameter. An estimate of the detonation velocity for an infinite tube diameter was obtained by plotting the velocity against the reciprocal of the tube diameter, φ-1, and extrapolating the line through the data to φ-1 = 0. The relative contributions of tube geometry and surface roughness to the deficits were systematically studied. Manson was also one of the early investigators to shed light on the cellular structure of detonation by reporting “vibratory phenomena” seen as striations in streak schlieren photographs. An attemptwas made to relate this phenomenon to “dispersions” in the propagation velocity and hence the wave stability. The author has extended Manson’s work by investigating detonations in tubes with yielding walls. Whereas boundary layers were responsible for the gasdynamic expansion and deficits in Manson’s rigid tubes, it was the moving boundaries that caused similar effects in the au
Report Number
DRDC-SUFFIELD-SL-2007-221 — Scientific Literature
Date of publication
12 Feb 2008
Number of Pages
Electronic Document(PDF)

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