可爆性气体泄漏扩散时均湍流场的数值模拟

NUMERICAL SIMULATION OF HOMO-TURBULENT FIELD OF EXPLOSIBLE GAS DISPERSION

本文介绍了一种基于κ-ε湍流模型的研究可爆性气体泄漏扩散的三维数值模拟方法。文中对乙炔气体扩散试验的风场和质量浓度场进行了数值模拟 ,并将质量浓度场的数值模拟结果与风洞试验数据进行了比较。模拟结果与试验数据吻合得很好 。

This paper presents an attempt to evaluate the explosible gas distribution by solving the concentration equation based on the previously simulated wind flow field. Since the explosible gas dispersion is often the cause leading to some serious accidents all over the world, it is generally regarded as a dangerous factor to be minimized. A numerical simulation happens to be for the time an ideal method to dissolve the concentration equation. In this paper, the author has tried a turbulence model, known as κ ε turbulence model. The author also made a comparison of the simulated numerical results with the available experimental data, which shows that the results prove to comply with the experimental data with the mean error being about 20.0%. Thus, the numerical method proves to be well validated. Furthermore, the numerical simulation results can also be used to describe and test the conditions of the wind flow field and the explosible gas distribution in the tunnel. The numerical model in this paper is, however, only applies to the explosible gas dispersion under the conditions of neutral atmospheric stratification.