本文采用紊态扩散模型分析了蒸汽浸没射流凝结过程,通过假设紊流区为单相水轴对称流动,利用自由紊动射流理论得到了紊流区轴向温度的计算公式。根据先前给出的温度特性半宽的实验关联式,得到蒸汽浸没射流引起的紊流区单相水射流的虚源,从而给出了计算紊流区轴向温度的半经验公式。本文中利用无量纲穿透长度确定了紊流区的起点位置,在此紊流区范围内,轴向温度的计算值和实验值吻合得较好,相对误差基本在±5%以内。
The steam jet condensation in water was analyzed using turbulent diffusion model by assuming the axisymmetric single-phase flow in the turbulent jet region,and the calculation equation was obtained by using the free turbulent jet.Based on the experimental correlation of jet half-width, the jet virtual source was calculated,and the semi-empirical correlation for predicting the axial temperature distribution was obtained.In this paper,the dimensionless jet penetration length was adopted to determine the turbulent region,where the predicted axial temperature agreed well with the experiments,and the discrepancies were within±5%.
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