泄漏孔径对特高压GIL管SF_(6)泄漏影响的混合数值模拟

Hybrid Numerical Simulation of the Influence on SF_(6) Leakage of UHV GIL Pipe Under Different Leakage Pore Sizes

[目的]为了分析具有6 km跨度特高压GIL内SF_(6)泄漏气体的泄压过程及其扩散形态,提出了一种一、三维混合CFD计算方法。利用1D Flowmaster研究具有不同孔径的泄漏口对SF6泄压过程的影响。利用3D Fluent分析SF_(6)在管廊内的扩散形态、浓度分布。[方法]为了验证混合数值方法的准确性,对比了1D Flowmaster和3D Fluent对同一管廊结构SF_(6)泄压过程的计算结果。[结果]仿真对比结果表明,Flowmaster模拟泄压过程具有计算速度快、精度高的特点。[结论]结合通风设计要求,获得基于泄漏孔径区间的轻度、中度、重度泄漏事故分类及对应扩散形态、浓度分布等重要数据,可为实际应用设计、事故处理提供指导。

[Introduction]In order to analyze the pressure relief process and diffusion pattern of SF_(6) leakage gas in a 6 km span in the UHV GIL,a type of 1D and 3D hybrid CFD numerical method is proposed.1D Flowmaster was used to study the influence of different pore size of leakage port on SF6 pressure relief process.3D Fluent was used to analyze the concentration distribution and diffusion pattern of SF_(6) in the pipe gallery.[Method]In order to verify the accuracy of the hybrid numerical method,the calculation results of 1D Flowmaster and 3D fluent for SF_(6) pressure relief process of the same pipe gallery structure was compared.[Result]The compared simulation result showed that Flowmaster simulation of pressure relief process has the characteristic of fast calculation speed and high accuracy.[Conclusion]Combining with the requirement of ventilation design,the classification of light,medium and heavy leakage accidents based on the interval of leakage aperture,the corresponding diffusion form,concentration distribution and other important data are obtained,which can provide guidance for practical application design and accident handling.