Visual test device for accurately testing effect of flammable gas unsteady detonation flame arrester

Abstract

The invention discloses a visual test device and method for accurately testing the effect of a flammable gas unsteady detonation flame arrester. The visual test device comprises a vacuum system, an automatic gas distribution system, a schlieren camera system, an unsteady detonation blocking test combustion pipeline, a test and data acquisition system and a high-pressure ignition and synchronous control system. According to the invention, a method combining a high-speed camera shooting technology and a schlieren optical technology is adopted to shoot and record a deflagration-to-detonation conversion process and a flame arrester flame arresting process in a pipeline, so that visualization of the whole process of unsteady detonation generation and blocking is realized, and a dynamic change rule of shapes and positions of flames and detonation waves along with time is accurately and visually presented. A pressure sensor is used for measuring the dynamic rising characteristic of the pressure in the pipeline, and the mutual relation between the pressure in the pipeline and the flame and detonation wave characteristics can be analyzed in combination with high-speed schlieren images. Light intensity changes in the pipeline are detected through a photodiode, so that position changes of initial flames and later detonation waves are obtained, and the propagation speeds of the flames andthe detonation waves at all moments can be obtained through analysis and calculation in combination with the high-speed schlieren images.

Description

technical field [0001] The invention belongs to the field of safety technology, and in particular relates to a visual test device and method for accurately testing the effect of an unsteady detonation flame arrester of combustible gas and air or oxygen premixed gas. Background technique [0002] Combustible gases (such as hydrogen, methane, and ethylene, etc.) are widely used in the fields of petroleum, electric power, mining, metallurgy, transportation, chemical industry, and gas supply due to their advantages of cleanliness, high efficiency, and wide range of sources. But on the other hand, due to the dangerous characteristics of combustible gas itself, such as flammability, explosion, leakage and low ignition energy, the safety issues in the production, transportation, storage and application process need special attention. If the combustible gas is improperly controlled or used, so that combustion-supporting gas such as air or oxygen enters the confined space containing ...

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Problems solved by technology

Therefore, it is impossible to ensure the blocking effect of the flame arrester on the more powerful overdriven detonation wave. If these traditional test devices with large uncertainties are applied to industrial processes, there will be great safety risks

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