The Theoretical And Experimental Research Of Steam-water Separator With Corrugated Plates

The high quality steam is important to the safety and economical work of nuclear-powered equipments. Due to the high separating efficiency, steam-water separator with corrugated plates is used to nuclear-powered equipments widely as the last stage of the steam separation system. At the same time, the steam-water separating process relating to breake of film and splash of droplets is a universal phenomenon in the two-phase flow, and the field of Engineering Thermophysics. So an improved understanding of the behavior of steam-water separation could benefit the design and optimization of steam separation system and is significant in the incorporated design of steam generator in nuclear submarine.The complicatedl turbulent two-phase flow in corrugated plates which comes into being the two–phase and three-flow-field caused major difficulties in modeling and experimentally simulating their internal flows. In this thesis, the separating mechanism of steam-water separator with corrugated plates is researched under the different work status including cold state and actual state. The mathematic equations describing the flow process are founded and the flow field and disperse are numerically simulated by FLUENT software. Then, the test-beds of cold and actual state are manufactured by indoor and 105 graduate school respectively. The tests are complished and the results are compared with the numerical value of the simulation. The research benefits to the understanding of the mechanism of separating process and increasing greatly the system efficiency, which is the base to optimize the structure.The main characteristics of the research in the thesis are as follows: A wide range of documentations about the steam-water separator with corrugated plates are reviewed worldwidely and the separating mechanism is introduced. The formation process of injected droplet is analysed and the diameter distribution resulted from different mechanisms are obtained. The mechanism of second droplets generation is analyzied; The two–phase and three-flow-field mathmatics model of separation process in corrugated plates considering about secondary droplets is built up by using the experiential correlations attained in annular two phase flow experiment; The separation process in the condition of cold and actual operation state of steam-water separator with corrugated plates is simulatd by the FLUENT computation code, the turbulent effect on the droplet trajectories is discussed expecailly due to its importance to separated the fine droplets. The pressure drop and separation efficiency, which varies with the geometric parameters and flow parameters in theseparator, are discussed. It could be concluded that the 2h type corrugated plate outperform the 1h type in the actual operation condition. The experiments under the cold and actual operation state of steam-water separator with corrugated plates are performed, and the experiment results agreed well with the numerical results.The bringouts in this thesis are very helpful to spreading and optimizing the application of steam-water separator with corrugated plates.