Study on affecting factors of temperature–pressure–stress-coupled field of lpg tank under fire based on Legendre wavelet finite element method

Abstract

In recent years, many explosion accidents of LPG (Liquefied Petroleum Gas) tank happen due to fires, temperature-pressure-stress coupled field parameters of LPG tank under fire change nonlinearly, which are affected by many factors, such as fire type and filling rate. In order to improve the computing efficiency, the Legendre wavelet function is combined with traditional finite element to construct the Legendre finite element, and the effect of every affecting factor on changing rule of coupled field of LPG tank under fire can be analyzed effectively. First, the basic property of Legendre wavelet is analyzed. Second, temperature–pressure–stress-coupled model of LPG under fire is constructed; the temperature-pressure-stress coupled Legendre wavelet finite element is established; and then the effect of every affecting factor on coupled field of LPG tank under fire is obtained. Results show that analysis precision based on Legendre wavelet finite element method can be improved effectively.