【摘要】 本文采用三维稳态的欧拉双流体模型,以自定义函数的形式在Ansys中嵌入基于热平衡的相变模型对超音速蒸汽在过冷水中稳定射流凝结的过程进行了数值模拟,对比模拟结果与实验结果的汽羽形状,发现二者吻合良好。当蒸汽入口压力为300 kPa,过冷水的温度为20℃,喷嘴喉部直径为8 mm,通过改变喷嘴出口直径为8.8、9.6、10.4、11.2以及12.0 mm.研究了喷嘴的压比对于超音速蒸汽射流凝结过程的汽羽形状影响,并且揭示了超音速蒸汽射流汽羽内部的流动过程。更多还原

【Abstract】 Three-dimensional steady method was employed to simulate the condensation process of supersonic steam condensed into subcooled water pool by embedding the phase change model based on thermal equilibrium into Ansys platform. By comparing the shape of steam plume between numerical and experimental results, good agreements were observed. When steam pressure, water temperature and the diameter of nozzle throat were 300 kPa, 20℃ and 8 mm. the diameters of nozzle exit were set as 8.8, 9.6, 10.4 11.2 and 12.0 mm, respectively. The effect of nozzle pressure ratio on the shape of steam plume and the internal flow process was revealed.更多还原