Introduction to Gasdynamics of Explosions: Course Held at by A. K. Oppenheim

By A. K. Oppenheim

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Extra info for Introduction to Gasdynamics of Explosions: Course Held at the Department of Hydro- and Gas-Dynamics, September 1970

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Ll. -~~ ~· •... . ' ........ ''), ' . ~ ,' . :. ~ : ~ : . . ' . ' . • ! \. _:,· • •" •. '·~I 10 9 Wave 11 Gasdynamics of Explosions 41 The flame starts first as a smooth-surfaced spheroid, Fig. 12a. As its front becomes wrinkled, it acceler ates, generating pressure waves that coalesce into a shock front as it can be seen at the bottom of Fig. 12b. Later, as shown on the subsequent sequence of photographs, Fig. 12c, the flame undergoes a transformation into a turbulent structure, while its surface acquires a characteristic caved-in, "tulip-shaped" form.

The regime labeled GASDYNAMICS OF EXPLOSIONS indicates the performance of propulsion systems which can be attained by the exploitation of this subject of study. It covers the range of operating conditions, overlapping both the CURRENT and ADVANCED technologies, and it should be, therefore, instrumental in bridging the gap between the two. I. 5. Future Prospects. In retrospect, we became acquainted with the physical nature of the life and birth of explosion processes, learned something about the manner in which they are studied, and had a glimpse at some of their fruitful yields, notably in propulsion devices, notwithstanding our realization of their so well known destructive power.

On that occur in a given system is then quite straightforward. c change in the overall size of the system, or. ty of energy deposition. This is illustrated by Fig. 1. 16 t see page 52 ) which displays the spectrum of power density deposited in the working substances of various prime-movers. Thus in a steam plant the power density of energy deposition into water is of an order of 1 kilowatt per liter ; in a cylinder of an internal combustion engine this can reach a level of 100 kilowatts per liter,while in a turbojet combustor it can be as high as 1 magawatt per liter.

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