NDLI: Numa Manson on velocity deficits and detonation stability : An invited memorial lecture presented at ICDERS 21

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Numa Manson on velocity deficits and detonation stability : An invited memorial lecture presented at ICDERS 21

Content Provider	Springer Nature Link
Author	Murray, S. B.
Copyright Year	2008
Abstract	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 detonation was modified to account for this, and it was 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, $${\phi^{-1}}$$ , and extrapolating the line through the data to $${\phi^{-1}=0}$$ . 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 attempt was 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 author’s investigations. The author has repeated the “nozzle” analysis of Fay and Dabora using the detonation cell length as the relevant chemical kinetic length scale, and found reasonable agreement between his experimental results and the model. When the Poitiers data are reinterpreted in light of the modified model, the trends are described quite well. More recent studies have shown that the measured deficits for mixtures characterized by irregular cellular structures do not agree with the Fay–Dabora model. Possible reasons for the discrepancy are discussed.
Ending Page	268
Page Count	14
Starting Page	255
File Format	PDF
ISSN	09381287
e-ISSN	14322153
Journal	Shock Waves
Issue Number	4
Volume Number	18
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-05-10
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Thermodynamics Fluids Engineering Thermodynamics, Transport Phenomena Velocity deficits Condensed Matter Engineering Fluid Dynamics Gaseous detonation Detonation stability Acoustics Cellular structure
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Mechanical Engineering

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Numa Manson on velocity deficits and detonation stability : An invited memorial lecture presented at ICDERS 21

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Numa Manson on velocity deficits and detonation stability : An invited memorial lecture presented at ICDERS 21