分段扰流子的实验研究

Experimental Invenstigation of the Segment-Turbulator

为了降低扰流子的阻力 ,提高其综合性能 ,将扰流子分成几段用钢丝联结构成一种新型的分段扰流子。以水为实验介质 ,在雷诺数小于 40 0 0的范围对不同长度的整段扰流子和分段扰流子的传热性能和阻力性能进行了对比实验。结果表明 ,不论整段还是分段扰流子 ,随着扰流子长度的增加 ,其阻力和传热系数均增加 ;在相同长度下 ,不论整段还是分段扰流子 ,随着流量的增加 ,其阻力和传热系数均增加 ;在实验范围 ,当扰流子长度相同时 ,分段扰流子和整段扰流子相比 ,其传热系数K的降幅在 1 .7%～ 3 .7%之间 ,而阻力的降幅在 1 2 %～ 2 9%之间 ,显然分段扰流子阻力的降幅远高于传热系数的降幅 ,说明分段扰流子优于整段扰流子的综合性能。

In order to reduce the resistance and improve the comprehensive performance of the turbulator, the whole turbulator was cut into several segments connected with steel wire to form a new type of turbulator called as segment-turbulator. Using water as a experimental medium, with Re being less 4 000, the comparative experiment was made for the whole furbulator and segment turbulator. The result shows that the resistance and heat transfer coefficient increase with the increasing of the length and the rate of flow of the whole turbulator or the segment turbulator. When the length of the two type of turbulator is the same, the resistance and heat transfer coefficient increase with the increasing of rate of flow, but the heat transfer coefficient of the segment-turbulator is 1.7%～3.7% less than that of the whole turbulator and the resistance of the segment turbulator is 12%～29% less than that of the whole turbulator. Performance of the segment-turbulator is superior to the whole turbulator.