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应用CFD软件对直角三角形螺旋流道内层流流体的流动特性进行了数值模拟,得到了充分发展条件下流体的速度场,分析了无量纲曲率δ、无量纲挠率λ对二次流强度和流体流动阻力的影响.结果表明,当δ=0.021～0.083且Re=200～1000时,流体流过该螺旋流道产生的二次涡为稳定的两涡结构;随Re及δ增大,二次流强度增强,流体阻力系数也相应增大;在研究范围内,λ对二次流强度及流体流动阻力的影响不大;当结构参数及Re取值相同时,三角形螺旋流道的阻力比半圆形螺旋流道小,且随Re增大,二者的差值增大,在所计算的Re范围内三角形螺旋流道的阻力系数为半圆管螺旋流道的84.1%～99.5%.
The CFD software was used to simulate the flow characteristics of the laminar fluid in a right-angle triangular spiral flow channel. The velocity field of the fluid was obtained under fully developed conditions. The influences of the dimensionless curvature δ, The results show that when δ = 0.021-0.083 and Re = 200-1000, the secondary vortex generated by the fluid flowing through the spiral flow channel is a stable two-vortex structure. With the increase of Re and δ, the secondary In the research area, λ has little effect on the strength of the secondary flow and the fluid flow resistance. When the structural parameters and the values of Re are the same, the resistance of the triangular spiral flow channel is less than half The circular spiral flow channel is small, and with the increase of Re, the difference between them increases. The drag coefficient of the triangular spiral flow channel is 84.1% -99.5% of that of the semicircular pipe in the calculated Re range.