对S/d0=2.0，S/d0=2.5和S/d0=3.0的同轴环形通道螺旋管换热器分别进行了流动特性及阻力特性的实验研究，并和圆形管道的理论值进行比较。得出流体流速、压力、流量及同轴环形通道的几何参数等对同轴环形通道流动特性的影响。结果表明：在环隙宽度S和螺旋管外径d0相同的条件下，随着雷诺数Re的增加，环形通道的进口阻力系数ξin、出口阻力系数ξout和总阻力系数ξz逐渐减小并逐渐趋于一定值；外圈环形通道的ξin、ξout、ξz均比中圈和内圈环形通道的大，但中圈和内圈环形通道的ξin、ξout、ξz相等；相同雷诺数条件下，S越小，流体在环形通道流动时，流体的进出口压力降ΔP就越大。

The coaxial annular channels’ experimental platform is built to study its flow characteristics when S/d0=2.0, S/d0=2.5, S/d0=3.0, and it is compared with circular pipe’s theoretical value. The purpose is to study the influence of flow rate, pressure, flux, heat transfer temperature and geometric parameters on the coaxial annular channels’ flow characteristics of spiral tube heat exchanger. The results show that for the same annulus width and outside diameter of spiral tube, annular channels’ import, export and total resistance coefficients are decreasing and tend to constants gradually as Reynolds number increases; all the resistance coefficients of annular channel’s outer ring are bigger than those of annular channel’s middle ring and inner ring. But the resistance coefficients of annular channel’s middle ring and inner ring are equal; under the same Reynolds number, the smaller the annulus width is, the bigger pressure drop of annular channel is.

国家863高技术基金项目(2007AA05Z265)