论文部分内容阅读
在较宽的实验参数范围内(系统压力P=8～15 MPa,质量流速G=800～1800 kg·m~(-2)·s~(-1),壁面热流密度q_w=200～950 kW·m~(-2))对一立式螺旋管内(管内径为10 mm,螺旋直径为300 mm,节距为50 mm)汽水两相流动沸腾干涸特性进行了实验研究。通过研究,获得了干涸发生时螺旋管圈壁温的分布特征以及压力、质量流速和壁面热流密度这三个参数对临界干度的影响规律。同时在实验数据的基础上,提出了一个适用于计算螺旋管内高压高含汽率工况下汽水两相流临界干度的经验关系式。
In the wide range of experimental parameters (system pressure P = 8-15 MPa, mass flow rate G = 800-1800 kg · m -2 · s -1, wall heat flux qw = 200-950 kW · M ~ (-2)) Experiments were conducted on the boiling and drying characteristics of two-phase flow in a vertical spiral tube (tube diameter 10 mm, spiral diameter 300 mm, pitch 50 mm). Through the research, the distribution characteristics of the wall temperature of the spiral coil when the drying occurs and the influence laws of the three parameters of the pressure, the mass flow rate and the wall heat flux on the critical dryness are obtained. At the same time, based on the experimental data, an empirical relation between the critical dryness of two-phase flow of soda and water in a spiral pipe under high pressure and high steam content is proposed.