Study On The Damage And Radiation Influence Area Of Storage Tank Under The Action Of Internal Vapor Cloud Explosion

Tanks are more typical shell-structure containers that are typically used to store different types of flammable and explosive materials.Most of the medium stored in the tank will have a volatility in the space above the liquid level in the tank.When the concentration of flammable gas in the tank reaches the combustion and explosion conditions,it is easily ignited by accidental energy(such as static electricity,small sparks).Etc.)A fire explosion occurred.The tank structure will be destroyed under the action of transient overpressure,and the explosion shock wave will radiate outward,resulting in secondary accidents in adjacent tanks in the tank area.In this paper,the combustion and explosion of combustible gas in the storage tank under the action of unexpected energy is taken as the engineering background,and the scientific problems are extracted from the research.The numerical simulation method is used to analyze the damage of the tank under the implosion load and the radiation distance of the explosion shock wave..The specific research contents are as follows:(1)Calculation and analysis of fluid domain model in storage tankThe computational fluid dynamics(CFD)method was used to establish the numerical calculation model of the flammable gas explosion process inside the tank.The explosion process of the flammable gas inside the tank structure was simulated,and the implosion load distribution of the inner wall surface temperature and overpressure of the tank was obtained.According to the analysis results,when the half liquid level and the full liquid level have different detonation positions,the temperature and pressure of the central detonation are greater than one side,and when the empty liquid level is different from the detonation position,the temperature and pressure of one detonation are greater than the central detonation with the storage tank.As the volume increases,the position at which the temperature and pressure load is first transmitted to the tank does not change,but the value of the peak pressure at each point in the tank gradually increases,and as the volume of the tank increases,the time at which each point reaches the peak pressure increase.(2)Analysis of multi-field coupling calculation of tank implosionThe three-dimensional tank structure model is established,and it is bi-directional fluid-solid coupling with the fluid domain model in the tank.The damage areas under different implosion positions,different liquid level heights and different volume storage tanks are calculated respectively.Analyze the analysis.The damage area of different volume storage tanks under different implosion loads is different.The specific performance is that the storagearea of the storage tanks increases with the increase of the storage tank volume.(3)Calculation and analysis of the influence area of the flow field inside and outside the tankThe implosion radiation model of the tank considering the internal and external flow fields is established,and the conditions for determining the end of the explosion shock wave are given.The propagation distance of the explosion shock wave to different radiation conditions is calculated,and the implosion radiation of different volume storage tanks is compared and analyzed.The difference between the distances and the calculation shows that with the increase of the tank liquid level,the radius of influence of the implosion radiation of the tank gradually decreases.With the increase of the tank volume,the area affected by the implosion radiation of the tank gradually increases.(4)Multi-field coupling calculation analysis of the whole process of tank implosionA multi-field coupling model of tank implosion is established.The bidirectional fluid-solid coupling method is used to calculate the final failure mode of the tank under the implosion load,and the difference between the implosion damage areas of different volume tanks is analyzed and compared.According to the research results,the closer the detonation position is to the position of the break,the more likely the damage occurs.