旋流型汽水混合加热器的数值模拟

摘要

设计了一种蒸汽入口中心线与轴有偏移量的旋流型汽水混合加热器.应用CFD软件FLUENT和VOF多相流模型模拟了汽水混合加热器内的两相流动,模拟结果与实验结果基本吻合.模拟结果表明:旋流型汽水混合加热器使蒸汽在蒸汽室内形成了旋流状态,偏移量越大旋流越好,汽永混合加热器内的温差越小,质量传递系数越大.%A new cyclone steam-water heater was designed which has offset between steam inlet centerline and axis. The CFD's FLUENT software and the VOF multiphase flow model were adopted to simulate steam-water flow in the heater. The simulation result which agrees with experimental result shows that this heater can make steam become rotational flow in steam room, and with the increasing of offset, the rotational effect becomes better together with small temperature difference and big mass transfer coefficients.