摘要
压力管道和容器发生贯穿泄漏会引发严重的事故,合理估算贯穿泄漏量具有重要的工程意义。以矩形狭缝通道模拟贯穿裂纹,开展了高压氩气-水贯穿模拟裂纹的高速流动可视化试验研究,狭缝长度为20 mm,间隙宽度为80~180μm。狭缝进口压力大于5 MPa,液体的表观速度为0.05~58.62 m/s,气体表观速度为1.71~34.27 m/s,采用两侧进水中间进气的特殊入口方式,研究了非均匀混合流体通过狭缝通道的流动特性。研究表明:入口压力越大出口位置压降的加速效应越明显;气体在并行双入口下,流体入口存在明显不对称流动现象,狭缝内高速气液流两相滑速比差异较小。依据的试验数据对两相摩擦压降的计算模型进行了验证和评价,得出采用Sun-Mishima关系式时对泄漏流量的估算效果最好,均相模型也具有较好的计算精度;当狭缝宽度为80μm时,现有关系式估算泄漏量偏小。
The penetrating leakage of pressure pipes and vessels can cause serious accidents,and the estimation of penetrating leakage has important engineering significance.A visualized experimental study was carried out about high speed flow of high-pressure argon-water in a rectangular slit channel as simulated penetrating crack.The length of the slit is 20 mm and the width was 80-180μm.The experimental inlet pressure was as high as 5 MPa,the apparent velocity range of liquid was 0.05-58.62 m/s,and the apparent velocity range of gas was 1.71-34.27 m/s.The flow characteristics of non-uniform mixed fluid through a narrow channel were studied by using a special inlet mode of water inlet on both sides and air inlet in the middle.The main conclusions are as follows:The larger the inlet pressure,the more obvious the acceleration effect of the pressure drop at the outlet;Under the condition of parallel double inlets,the asymmetric flow appears at the fluid inlet;Based on the experimental data,the two-phase friction pressure drop prediction model was verified and evaluated,and it shows that the Sun-Mishima relationship is the most accurate estimation of the leakage flow,and the homogeneous model also has better calculation accuracy.When the slit width is 0.08 mm,the leakage flow estimated by the existing relationship is a little small.
作者
杨振东
孙佳翔
曹亚龙
张巧玲
施苏齐
李国栋
YANG Zhendong;SUN Jiaxiang;CAO Yalong;ZHANG Qiaoling;SHI Suqi;LI Guodong(State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China,Xi′an University of Technology,Xi'an 710048,China)
出处
《热科学与技术》
CAS
CSCD
北大核心
2021年第6期563-571,共9页
Journal of Thermal Science and Technology
基金
国家自然科学基金资助项目(51706180)。
