Combined with parameters of potassium nitrate cooling crystallization in practical production,a new steam-jet supercharger that could improve the productivity,increase the operating cycle of the evaporator,and decrease the consumption of energy was designed to match the practical production by means of strict theoretical computation. By using the computational fluid dynamics approach Fluent,a numerical simulation was conducted on the working process of steam-jet supercharger for potassium nitrate cooling crystallization,and the influences of different values X (the distance between the outlet of the nozzle and the inlet of the absorbing chamber) on flow field were comparatively analyzed. Computational results showed that the parameter X had a closed relation to flow field of the steam-jet supercharger on the condition that operating parameters keep unchanged. Calculated by numerical simulation, when X =0. 01 m,the designed supercharger effectively cut down the wastage of total pressure due to shock waves and reduced the rate sudden changing of jet airflow,at the same time,and good application had been made in practical production.%结合硝酸钾冷却结晶实际生产的各项参数,通过严格的理论计算,设计出与生产相匹配的蒸汽喷射增压器,以提高蒸发器的产能和运转周期,降低能耗.并采用流体动力学计算软件Fluent对硝酸钾冷却结晶的蒸汽喷射增压器的工作过程进行数值模拟.比较分析了不同的X(喷嘴出口到吸收室入口的距离)值对流场的影响.结果表明,在一定的工况参数下,蒸汽喷射增压器的流场与X值有着密切的联系.通过数值模拟计算得到,当X=0.01 m时,设计的增压器有效降低了激波引起总压的耗损和减小喷射气流速度的突变,同时在实际生产中得到了良好的应用.
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