平椭圆弯管冲蚀磨损数值模拟

为了研究天然气运输过程中含砂气体对弯管的冲蚀磨损特性并提高弯管的耐磨性,在充分分析圆管流体冲蚀特性的基础上提出了平椭圆管道。利用气固两相流冲蚀方程对平椭圆管道弯头进行冲蚀磨损分析,研究了不同长宽比的平椭圆管道的冲蚀速率和冲蚀区域形状,从中优选出合适的长宽比,并分析了不同质量流量、不同粒子直径及不同气体流速等工况下粒子对管道冲蚀的影响。分析结果表明:相比于普通圆管,平椭圆管能明显降低最大冲蚀速率,随着平椭圆管长宽比的增大,最大冲蚀速率逐渐下降;当长宽比达到1.4后,最大冲蚀速率下降的速度明显降低,因此认为平椭圆管最适宜的长宽比为1.4,此时最大冲蚀速率下降了21.9%;当粒子直径增大时,平椭圆管弯头处的最大冲蚀速率先升高、后降低、再升高,冲蚀区域基本保持不变。所得结论可为平椭圆弯管抗冲蚀措施的制定提供参考。

Numerical Simulation on Erosion Wear of Flat Oval Elbow

In order to study the erosion wear characteristics of sand-containing gas on elbow during natural gas transportation and improve the wear resistance of the elbow, on the basis of fully analyzing the fluid erosion characteristics of circular pipe, a flat oval pipe was proposed. The gas-solid two-phase flow erosion equation was used to analyze the erosion wear of the elbow of flat oval pipe, and study the erosion rate and erosion area shape of the flat oval pipe with different length-width ratios;then, appropriate length-width ratio was selected, and the effects of particles on pipeline erosion under working conditions such as different mass flow rates, different particle diameters and different gas flow rates were analyzed. The analysis results show that compared with ordinary circular pipe, the flat oval pipe can obviously reduce the maximum erosion rate, and as the length-width ratio of flat oval pipe increases, the maximum erosion rate decreases gradually;when the length-width ratio reaches 1.4, the decreasing speed of the maximum erosion rate decreases significantly, so it is believed that the most optimal length-width ratio of flat oval pipe is 1.4, at this time, the maximum erosion rate decreases by 21.9%;when the particle diameter increases, the maximum erosion rate at elbow of the flat oval pipe increases first, then decreases, and then increases. The conclusions provide reference for the formulation of erosion resistance measures of flat oval elbow.