Numerical Simulation Of Fuel Dispersion In 20L Explosion Tank

Fuel is widely used in industrial and agricultural production and people's life.It is very difficult to study the characteristics of explosion and the safety of explosions in the field of safety.The fuel dispersion process involves complex scientific problems such as multiphase and turbulence.In this paper,the research on the dispersion process of liquid fuel,solid fuel and solid-liquid fuel in 20 L spherical explosion tank with secondary pulsation device is carried out.The following results are obtained:1.According to the structure and size of the 20 L spherical explosive can with secondary pulsation device,this paper established the real physical model,including the spherical explosive can and the nozzle structure,divided the mesh into the established physical model,and then selected A mathematical model and calculation method are established,and a numerical simulation method of fuel dispersion in a 20 L spherical explosion tank with secondary pulsation device is established.The curves of the concentration of fuel in a specific monitoring point with time are obtained.The results of numerical simulation of solid-liquid mixed fuel with the experimental results under the same conditions show that the average relative error of monitoring point concentration is 9.8%.The numerical simulation results have good accuracy.2.In this paper,the criterion of fuel mixture uniformity is first proposed,then the dispersion process of liquid fuel(ether)in 20 L explosion tank under different concentrations and different aerodynamic pressures is studied.The results showed that when the concentration of ether was 100g/m3,the aerodynamic pressure was 0.3Mpa and the aerodynamic time was 50 ms,the maximum and minimum concentration deviation of monitoring point was 27.2%,the dead angle was 11.1%,the excess ratio was 11.1% and the mixing degree was 0.54.and the mixing uniformity is the best.3.In this paper,the same research methods and conditions were used to study the dispersion process of solid fuel(aluminum powder)in 20 L explosion tank under different concentrations and different aerodynamic pressures.The results showed that the maximum and minimum concentration deviation of monitoring point was31.8%,the dead angle rate was 0,the excess rate was 0,the mixing degree was 0.64 when the aluminum powder concentration was 900g/m3,the pneumatic pressure was0.5Mpa and the pneumatic duration was 50 ms.and the mixing uniformity is the best.4.This paper further studies the solid-liquid mixed fuel(ether-aluminum powder)dispersion process.The results showed that the maximum and minimum concentration deviation of monitoring point was 30.2% and the dead angle was 22.2%when the aerosol pressure was 0.4Mpa and the aerodynamic time was 50 ms when the concentration of diethyl ether-aluminum mixed fuel(1: 1)was 300g/m3.The excess ratio is 0,the mixing degree is 0.65,and the mixing uniformity is the best.In this paper,the dispersion process of liquid fuel,solid fuel and solid-liquid mixed fuel in a 20-L spherical explosion can was obtained.The uniformity of the fuel-air mixture was further analyzed,which laid the foundation for the study of the properties and safety.