Deflagration experimental method and device for gas cloud with concentration gradient in open space

Abstract

The invention discloses a deflagration experimental method and a deflagration experimental device for gas cloud with concentration gradient in an open space, which are used by the gas deflagration test technology. The deflagration experimental method comprises the following steps: covering over two layers of hemispherical films on a circular gradient plate from inside to outside; removing air between each layer of film; injecting pre-mixed gas cloud with different concentrations between the gradient plate and the films and between every two layers of films; igniting in a pre-mixed gas cloud concentration area with any concentration; simultaneously acquiring an electrical signal of a pressure transmitter to transmit to a computer for comparison and obtain a deflagrating pressure variation curve. The invention also provides an experimental device according to the method. The deflagration experimental method and the deflagration experimental device can simulate the characteristics of the gas cloud with the concentration gradient in the open space, acquire results of overpressure values of the deflagration generated by ignition in areas with different concentrations, and simulate a real deflagration result.

Description

technical field [0001] The invention relates to an industrial field gas deflagration test technology, and relates to an experimental device and a use method for gas cloud deflagration with concentration gradients in an open space. Background technique [0002] Gas cloud deflagration is a common phenomenon in industrial sites. So far, scholars and experts at home and abroad have conducted a lot of research on gas cloud deflagration, and have achieved certain results in both gas deflagration mechanism and experimental research. In terms of experimental research on unconfined gas cloud deflagration in open space, foreign scholars David C Bull, Hunghes K J, etc. conducted spherical, hemispherical, and disc-shaped gas cloud deflagration experiments. In 2003, Yang Guogang conducted an experimental study on the effect of fuel concentration on gas cloud explosion in open space. The vapor clouds in the above-mentioned deflagration experiments are all ideal shapes, such as spherical...

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Problems solved by technology

[0003] Under open space conditions, such as natural gas pipeline leakage, blowout out of control, the gas cloud formed by a large amount of natural gas ejected from the wellhead is not uniformly mixed, and the deflagration effect is closely related to the concentration area where the ignition is located, so the gas cloud in the above experiment The cloud device does not conform to the shape of the flammable gas cloud in the open space, and cannot truly reflect the deflagration effect under the concentration gradient in the open space, and there are large errors in the experimental results

At present, there is no experimental device and method dedicated to deflagration with concentration gradients in open spaces.

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