Prediction of gas state properties and flow parameters during high-pressure gas leakage

Abstract

The accurate assessment of combustible gases leaking from high-pressure storage facilities is fundamental to disaster prevention and accident rescue. The current computing methods of gas leakage commonly fail to account for the actual behavior of high-pressure gases and gas leakage resistance, leading to inaccuracies in predicting high-pressure gas leakage. This study established a gas leakage process model based on the Peng-Robinson equation of state, considering the effects of the molecular volume and intermolecular forces on the properties of high-pressure gas. Factors affecting the resistance correction coefficient of the leakage model were investigated in conjunction with the CFD simulation results to provide a formula of gas leakage resistance coefficient. The proposed model is compared with existing models and validated using experimental data. It was found that the proposed model was able to obtain more satisfactory results. The margin of error of modified leakage model remains below 12%, providing robust support for accurately evaluating the consequences of high-pressure gas leakage accidents. The current findings are of significance for the design of high-pressure gas storage and transportation systems in future.