The Effect of Obstacle Arrays on the Combustion of Large Premixed Gas/Air Clouds

A. J. Harrison; J. A. Eyre

doi:10.1080/00102208708952572

The Effect of Obstacle Arrays on the Combustion of Large Premixed Gas/Air Clouds

A. J. Harrison, J. A. Eyre

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Abstract

A series of large-scale combustion tests has been conducted in which - 4000 m³of premixed natural gas/air and propane/air was ignited in a wedge-shaped enclosure representing a segment of a large pancake-shaped cloud. Whereas an unobstructed natural gas/air cloud produced only a few millibars overpressure when ignited by a low-energy ignition source an obstacle array consisting of six grids of horizontal pipes, representing a segment of industrial plant, accelerated the flame to a speed in excess of 100m/s and produced an overpressure of ~200mbars. A number of different obstacle configurations were investigated to demonstrate the effects of changing the obstacle parameters (height, blockage and grid spacing) on the flame speed and overpressure. The results of these tests clearly show that obstacle arrays typical of those encountered in industrial plant can lead to the production of damaging overpressures.

Original language	English
Pages (from-to)	121-137
Number of pages	17
Journal	Combustion Science and Technology
Volume	52
Issue number	1-3
DOIs	https://doi.org/10.1080/00102208708952572
Publication status	Published - 1 Mar 1987
Externally published	Yes

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10.1080/00102208708952572

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The Effect of Obstacle Arrays on the Combustion of Large Premixed Gas/Air Clouds

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