换热管内置螺旋形扭带的阻力与转动特性实验研究

Experimental Studies on Resistance and Rotational Characteristics of Heat Transfer Tube with Helically Twisted Tape

为了研究螺旋形扭带阻力与转动特性,选取了不同宽度(6,7和8 mm)的三种扭率(2.0,3.0,4.0)及3种螺距比(1.5,2.0,2.5)的参数组合下共27根螺旋形扭带插入换热管内进行实验。实验结果表明,插入螺旋形扭带后换热管内流动阻力和转动性能都有明显提高,并且分析了其带宽、扭率和螺距比等参数对压降和转速的影响。通过对实验数据的多元线性回归分析,建立了相应的压力降关联式和转速关联式。通过与光滑扭带实验数据对比,证明了实验研究的扭带具有良好的转动性能。

An experimental study on resistance and rotational characteristics in a heat transfer tube was carried out, which equipped with 27 helically twisted tapes consisting of different width （6, 7 and 8 mm）, three twist ratios （2.0, 3.0, 4.0） and three helical pitch ratios （ 1.5,2.0, 2.5 ）. The experimental results show that the friction resistance and rotational characteristics have a marked improvement after adding helically twisted tape. And the influence of width, twist ratios, helical pitch ratios and other parameters on pressure drop and rotational speed were analyzed. The pressure drop equation and rotational speed equation were established by analyzing the experimental data with Multiple Linear Regression Analysis. Compared with the experimental data of the smooth twisted tape, it indicates that the rotational characteristics of the helically twisted tape are good.