Numerical Simulation Of Shock Wave Reduction Mechanism In Water And Powder Built In Cavity

According to accident statistics in recent years,gas explosion accidents account for a large proportion of coal mine safety production,and the damage caused by gas explosions is also very cruel.Therefore,studying the mechanism of gas explosion and the reduction method of shock wave energy are crucial to preventing the occurrence of coal mine gas explosion accidents.At present,the suppression method of gas explosion is mainly divided into active suppression and passive suppression.The active explosion suppression measures have the disadvantages of low sensitivity,poor stability and high maintenance cost,which makes it difficult to be widely used in coal mine safety production;Hence,this paper mainly discusses the principle of passive explosion suppression measures.The shock wave energy reduction with water and powder in the cavity is researched by numerical simulation.It not only provides a new theoretical basis for mitigating gas explosion damage,but also has extraordinary significance for the development of coal industry.In this paper,the mechanism of gas explosion shock wave reduction with water and powder is studied by theoretical,simulation and experimental research method.With numerical simulation of gas explosion in a straight pipe 500*500*200 single cavity,built-in water 500*500*200 single cavity,built-in powder 500*500*200 single cavity,500*500*200 and 300* 500*200 combined cavity,built-in water 500*500*200 and 300*500*200 combined cavity,built-in powder 500*500*200 and 300*500*200 combined cavity structure for numerical simulation,it is found that the combined cavity structure of 500*500*200 and 300*500*200 with built-in powder is relatively best for gas explosion suppression.The attenuation amplitude of the shock wave overpressure is about 56.7%;At the same time,this paper uses a large-scale gas explosion test system with a diameter of 200 mm and a length of 34 m to verify the numerical simulation.At the same time,it is equipped with a data acquisition system such as synchronous pressure.A series of gas explosion tests were carried out.It is concluded that the test results are the same as the numerical simulation results of the gas explosion in the single cavity structure and the combined cavity of the built-in ABC dry powder.The attenuation effects of the single cavity structure and the combined structure of the built-in ABC dry powder on the peak overpressure of the shock wave are 35.9% and 50.3%,respectively.The combined cavity with built-in ABC dry powder has better wave-eliminating effect.Numerical simulations and experimental data,as well as the conclusions of their regularity,can provide new ideas for the prevention and control of gas explosions.It is very valuable and meaningful for preventing gas explosion accidents.Figure 41 Table 7 References 101...