一维喷管中湿蒸汽非均质凝结流动的研究  

STUDY ON HETEROGENEOUS CONDENSING FLOW IN A 1D NOZZLE

作　　者：陈红梅[1] 李亮[1] 丰镇平[1] 李国君[1] 

机构地区：[1]西安交通大学能源与动力工程学院,陕西西安710049

出　　处：《工程热物理学报》2004年第3期395-398,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金(No.50176035)

摘　　要：本文研究了湿蒸汽流中的非均质凝结流动现象,建立了自发凝结流动和非均质凝结流动统一的数值模型,并对一维喷管中的非均质凝结流动进行了数值分析。结果表明,蒸汽中杂质微粒浓度是影响非均质凝结流动的主要因素,在微粒浓度达到 10^(13)～10^(14)/kg 后杂质开始对凝结流动产生明显影响;在微粒浓度约为 10^(14)～10^(16)/kg 的范围内,外来凝结核并没有抑制流动热力学不平衡的发展,反而使其程度加深;在微粒浓度大于 10^(17)～10^(18)/kg 的情况下,足够多的外来凝结核充分抑制了非平衡条件下的自发凝结,整个流动过程中蒸汽始终处于平衡态附近。此外,微粒半径等因素对非均质凝结流动也有影响。The heterogeneous condensing flow in wet steam was investigated. A unified numerical model of homogeneous/heterogeneous condensation was established. With this model, the heteroge- neous condensing flow in a one-dimensional (1D) nozzle was studied. The numerical results showed that the concentration of heterogeneous particles in steam is the main factor affecting the flow characteris- tics. A remarkable change of condensing flow is observed when the concentration of particles reaches 10^(13)～10^(14)/kg; when the concentration ranges between 10^(14)～10^(16)/kg, the thermodynamic nonequi- librium state of steam is not degraded but reaches a higher level; When the concentration reaches 10^(17)～10^(18)/kg, the number of heterogeneous particles is enough to effectively weaken the nonequi- librium spontaneous condensation, the steam is keeping thermodynamic equilibrium in the flow. In addition, other parameters such as the radius of particles also have influence on the heterogeneous condensing flow.

关 键 词：湿蒸汽 非均质凝结 

分 类 号：O354[理学—流体力学]