大型螺旋波纹管内流动与传热的数值模拟研究

The numerical simulation research for the heat transfer and flow of the large-scale helically corrugated pipe

利用流体仿真软件FLUENT对不同结构参数的某大型螺旋波纹管管内烟气的流动和传热进行了三维稳态数值模拟,比较和分析了螺旋波纹管和光滑管的换热性能,并通过控制变量法研究了螺纹高度、螺纹宽度和螺距等结构参数对螺旋波纹管综合换热性能的影响。研究表明,随着螺纹高度和螺距的增大,螺纹宽度的减小,螺旋波纹管的综合换热性能获得相应的提高。本文还依据模拟的结果,通过回归分析拟合出了努赛尔数、摩擦因数以及综合换热效率的相应关联式,并且通过优化给出了换热管综合换热效率最高时的结构参数,为螺旋波纹管的工业应用提供了理论支持和技术储备。

The FLUENT as a fluid simulation software is applied for the three-dimensional steady state numerical simulation to obtain the performance of the heat transfer and flow resistance of smoke in the large -scale helically corrugated pipes which have different structure parameters, and at the same time, the heat transfer performance between the helically corrugated pipe and the smooth pipe has been compared and analyzed. Using the method of controlling variable to research the influence of the helical corrugated height ,corrugated width, pitch of the helically corrugated pipes on comprehensive transfer performance .The study shows that the comprehensive heat transfer performance gets corresponding rise with the increment of corrugated height and pitch, or the decrement of corrugated width.. Finally, according to result of the simulation, the associated formulas for the Nusselt number, friction factor and comprehensive heat transfer efficiency of helically corrugated pipe are obtained by the means of regression analysis, and the optimal structural parameters are given when the helically corrugated pipe gets the highest comprehensive heat transfer efficiency through optimization method, which give the theoretical support and technical reserve for the industrial application of the helically corrugated pipe.