Thermodynamic Coupled Analysis of Horizontal LPG Tank under Jet Fire Based on Shannon Wavelet Finite Element Method

基於Shannon小波有限元法的噴射火災下臥式LPG儲罐的熱動力耦合分析

趙斌(Bin Zhao)

《中國機械工程學刊》 36卷5期 (2015/10) Pp. 413-420

摘要

噴射火災環境下LPG 儲罐將導致爆炸事故，因此，有必要對LPG 儲罐內的氣液相介質的熱動力耦合規律進行探究。首先，總結了相關研究成果。其次，利用狀態方程、VOF 模型以及不可壓縮湍流構建了氣液相LPG 的溫度壓力耦合模型。然後，構建了Shannon 小波有限單元，並且討論收斂準則和誤差步。最後，利用ANSYS 軟體和Shannon 小波有限元法進行了噴射火災環境下LPG 儲罐的熱動力仿真研究，獲得了儲罐內LPG 的溫度和壓力變化規律，並且得到了溫度壓力耦合機制。仿真結果表明Shannon 小波有限元法具有較高的計算精度和效率。

並列摘要

LPG tank under jet fire will cause explosion accident, it is important to study the thermodynamic coupled rules of the gas and liquid phase in LPG tank. Firstly, relating researches are summarized. Secondly, the temperature-pressure coupled model of gas phase and liquid LPG is established based on equation of state, VOF model, and Governing equation of incompressible turbulent. Thirdly, the Shannon wavelet finite element is constructed. Then the convergence criteria and choice of time step are discussed. Finally, thermodynamic coupled simulation analysis of the LPG tank under jet fire is carried out based on ANSYS software, Shannon wavelet finite element method, and test respectively, and the temperature and pressure changing rules of LPG in tank are obtained, the temperature-pressure coupled mechanism is obtained. Results show that the Shannon wavelet finite element method has higher computing precision and efficiency.

並列關鍵字

Thermodynamic coupled ； LPG tank ； wavelet finite element method ； jet fire.