The entity models with different structural parameters is established by using Pro/E using multi-start spiral pipe as the research object and water as heat transfer medium. The heat transfer process of spiral pipe is simulated through the FLOTRAN CFD in ANSYS. Orthogonal experiment is performed to study the effect of the main structural parameters on the heat transfer enhancement process. The comprehensive evaluation index(PEC-1) of heat transfer performance improves significantly with increasing coil head number. PEC-1 value decreases sharply with helix angle at forty-five degrees or larger. The groove depth has relatively small effect on the value of PEC-1. The structural parameters of the multi-start spiral pipe is optimized by analyzing the variances of orthogonal experiment results.% 以多头螺旋管为研究对象,以水为传热介质,利用Pro/E建立不同结构参数的螺旋管实体模型,通过ANSYS中的流体传热分析模块FLOTRAN CFD对螺旋管对流换热过程进行三维数值模拟,研究采用正交实验的方法,探究了换热过程中螺旋管各主要结构参数对其传热性能的影响。结果表明：对于综合换热性能评价指标PEC-1,随螺旋管头数的增加,其值有明显的提升,当螺旋角超过45°时,PEC-1的值急剧下降,而槽深的变化对其作用相对较小。通过对正交实验结果的直观及方差分析,完成了对多头螺旋管结构的优化。
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