微小通道内流动沸腾压降特性实验研究  

Experimental Investigation of Pressure Drop Characteristics of Flow Boiling in Mini-channels

作　　者：王旭[1] 陈宏[1] 匡波[1] 帅剑云[2] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200030 [2]斯图加特大学核能与能量系统研究所,德国斯图加特70550

出　　处：《热能动力工程》2004年第1期4-9,共6页Journal of Engineering for Thermal Energy and Power

摘　　要：通过对矩形微小通道中流动沸腾的实验 ,讨论了通道压降的稳态与动态特征及稳定域判别方法 ;对不同实验工况下压降时序进行频域分析 ,提出微小通道压降振荡的产生主要源于汽泡产生、传输及微小通道与入口可压缩空间或柔性空间的耦合 ;此外 ,基于AR(自回归 )模型对系统实验段压降振荡进行实验建模 ,结果表明 ,较大流量时受限变形汽泡流与环状流出现时压降振荡相对较稳定 ;小流量时 ,压降不稳定性情况比较复杂 ,容易形成不稳定区域。In the wake of experimental tests of flow boiling in rectangular mini-channels, discussions are held concerning the steady and dynamic characteristics of pressure drop in the channels and a method for stable domain discrimination. After a frequency domain analysis of pressure-drop time series under various experimental operating conditions, it is found that the emergence of pressure drop oscillations in mini-channels can mainly be attributed to vapor generation, transmission and the coupling of mini-channels with inlet compressible or flexible space. Moreover, based on an autoregression model of time-series analysis, a model for testing pressure drop oscillations along a test section has been set up. The test results indicate that during a relatively great flow rate, the pressure drop oscillations in the presence of a restricted and deformed steam-bubble flow and an annular flow was found to be relatively stable. However, in the case of a small flow rate, the unstable condition of the pressure drop is rather complicated, tending to set up an unstable zone.

关 键 词：微小通道 流动沸腾 压降 压降振荡 

分 类 号：TK124[动力工程及工程热物理—工程热物理]