Modeling and simulation of explosive decompression test for units and decompression time analysis

Abstract

In view of the demand for explosion decompression test of aviation and plateau electronic products and the immature test technology at home and abroad, the explosion decompression test technology is studied, and the test scheme of nesting low-pressure chamber and atmospheric chamber is put forward. Based on the experimental scheme, the theory of compressible gas isentropic flow and RNG-k-$\varepsilon$ The turbulence model establishes the transient mathematical model of explosion decompression, studies the influencing factors of decompression time, carries out explosion decompression simulation analysis based on ANSYS Workbench platform, and quantitatively analyzes the influencing factors. The simulation results show that reducing the initial pressure of the low-pressure chamber can effectively reduce the decompression time. When the initial pressure drops to 10kPa and below, the decompression time is about 70ms. The lag time of the pressure change at the monitoring point compared with the pressure change at the product placement point accounts for about 15% of the total decompression time. Combined with the simulation and test data, a scheme optimization method is proposed. The design pressure drop area falls within 90% of the total pressure drop area, which can make the decompression time meet the requirements of explosion decompression test.