高压及超临界压力下螺旋管内单相水摩擦压降特性实验研究

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基金项目:

国家自然科学基金会创新研究群体科学基金项目(50821064)

Experimental Investigation on Frictional Pressure Drop of Single-Phase Water in Helical Coils at High and Supercritical Pressure

1. State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, China;
2. College of Mechanical and Electrical Engineering, Hohai University, Changzhou, Jiangsu, 213022, China

摘要: 在较宽的参数范围内对高压及超临界压力下单相水流经立式螺旋管的摩擦压降特性进行实验研究。研究表明,对于高压工况,在高雷诺数Re条件下的水力粗糙区,管壁粗糙度对摩擦压降的影响要远大于二次流的影响,故单相水在螺旋管内的摩擦压降基本可直接采用直管的相关公式来预测;对于超临界压力工况,在物性变化剧烈的拟临界区内,采用高压工况计算公式所得的摩擦压降预测值要明显偏低于实验值。
- 螺旋管 /
- 摩擦压降 /
- 高雷诺数Re /
- 超临界
Abstract: The frictional pressure drop characteristics of single-phase water were experimentally studied in a vertically-oriented helically-coiled tube at high and supercritical pressure.Experiments were performed in wide ranges of Reynolds number.For the hydraulic roughness region with high Reynolds numbers at high pressure,the effect of surface roughness on frictional pressure drop is much higher than that of secondary flow.The frictional pressure drop of single-phase water in helical coils can be predicted by related equations just for straight tubes.For the pseudo-critical region with the great variation in the physical properties at supercritical pressures,the frictional pressure drop calculated by related equations for high pressure cases was obviously smaller than experimental data.
- Helical coils /
- Frictional pressure drop /
- High Reynolds number /
- Supercritical