Effect of helically coil diameter on thermal-hydraulic inhomogeneity in helically coiled tube

doi:10.3969/j.issn.0438-1157.2014.z2.022

Abstract

Abstract:

A three-dimensional "unit pipe" physical model of helically coiled steam generator is established based on the similarity theory, two fluid model considering mass, momentum and energy transfer is used, and describe the process of two fluid phase through the bulk boiling model. Numerical investigation on the flow and phase change in the helically coil tubes with the helically coiled diameter 200 mm, 500 mm and 1718 mm is thereby carried out. Simulation results show that the obvious secondary flow is formed due to the centrifugal force, and the smaller the helically coiled diameter and the greater the velocity is, the more obvious the secondary flow is. In two-phase flow area, the helically coiled diameter has great influence on the distribution of two-phase flow. In addition, the smaller the helically coiled diameter is, the larger the temperature difference is due to the effects of vapor-liquid separation and the secondary flow. The temperature difference of circumferential wall temperature on the single-phase flow area is dramatically larger than that of two-phase flow area.

Key words: helically coiled steam generator, helically coil diameter, thermal-hydraulic, vapor-liquid two-phase flow, numerical simulation

摘要：

基于相似理论建立螺旋管式蒸汽发生器的"单元管"三维物理模型,采用考虑相间质量、动量、能量传递的两流体模型,结合描述两流体间相变过程的"bulk boiling"热相变模型,对3种螺旋直径(200 mm、500 mm、1718 mm)的螺旋管内的流动与相变过程进行数值模拟研究。模拟结果表明,流体在离心力的作用下将产生明显的二次流,且螺旋直径越小、流速越高,二次流越明显。在沸腾换热区,螺旋直径对两相流体的相分布有着较大的影响。另外,由于气液分离和二次流的影响,螺旋直径越小,螺旋管截面周向壁温温差越大,且在单相对流换热区截面周向壁温温差显著高于沸腾换热区。

关键词: 螺旋管蒸汽发生器, 螺旋直径, 热工水力, 气液两相流, 数值模拟

CLC Number:

TL33

LIU Shanghua, SUN Baozhi, SHI Jianxin, HAN Wenjing, ZHANG Guolei, GAN Yiran. Effect of helically coil diameter on thermal-hydraulic inhomogeneity in helically coiled tube[J]. CIESC Journal, 2014, 65(z2): 148-154.

刘尚华, 孙宝芝, 史建新, 韩文静, 张国磊, 干依燃. 螺旋直径对螺旋管热工水力不均匀性的影响[J]. 化工学报, 2014, 65(z2): 148-154.

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