【摘要】 以水为介质，通过数值模拟对湍流条件下截面圆心角α在90°～180°范围内、螺旋直径在1 000～4 500 mm之间的大型弓形截面螺旋管中流体流动与传热性能进行模拟研究。结果表明，在一定的体积流量下，截面圆心角小于180°的弓形截面管相比半圆形截面管具有更好的综合换热和经济性能。α为90°时的PEC可达180°时的1.18倍。当交换相同的热量时，α为90°的弓形截面管比半圆管所需材料可减少约71.6%。在大量数值模拟结果基础上，通过引入截面圆心角变量α,拟合得到了弓形截面螺旋管中流体流动与传热准数Nu和f关联式。数值验算表明，关联式精度较高，可用于大型弓形截面管夹套的工艺计算。更多还原

【Abstract】 Using water as the medium, the fluid flow and heat transfer performance in large arcuate helical pipes with the central angles of 90°～180° of the cross-sections and the helical diameter of 1 000～4 500 mm were numerically studied under turbulent flow conditions.The results show that under a certain volume flow rate, the arcuate sectional pipe with the central angles of less than 180° of the section has better comprehensive heat transfer performance and economy than the half-round sectional pipe.When α is 90°,the PEC can reach 1.18 times that of 180°.If the same amount of heat is exchanged, the material consumption of the arcuate helical-pipe with a center angle of 90° can be reduced by about 71.6% compared with the half-round sectional pipe.Based on large quantity of numerical simulation results, correlation formulas of Nu and f for large arcuate helical pipes were obtained by introducing the central angle α of the cross-sections and by fitting.Numerical verifications show that the correlation formulas are accurate enough and can be used in engineering for process calculations of large arcuate helical-pipe jackets.更多还原