取向硅钢常化冷却段空气雾化喷嘴内流场数值模拟

Numerical Simulation of the Flow Field Inside the Air Atomization Nozzle in the Normalized Cooling Section of Oriented Silicon Steel

为改善取向硅钢常化过程带钢的冷却效果,对空气雾化喷嘴内气液两相流动过程进行三维数值模拟研究,分析空气压力和水流量对喷嘴内流场速度和液相体积分数的影响。数值计算值与实验测试值吻合良好且最大误差小于10%。结果表明:当水流量一定时,随着空气压力的逐渐增大,喷嘴内速度增大、液相体积分数减小,喷嘴出口处速度分布均匀性变差,液相体积分数分布更均匀;当空气压力一定时,随着水流量的逐渐增大,喷嘴内速度逐渐减小、液相体积分数增大,喷嘴出口处速度分布更均匀,液相体积分数分布均匀性变差;喷嘴气水压力比为1.1时冷却均匀性较好,冷却均匀性最佳的工况为空气压力0.2 MPa、水流量180 L/h。

In order to improve the cooling effect of the oriented silicon steel constant annealing process,a three-dimensional numerical simulation of the air-liquid two-phase flow inside the air atomization nozzle was conducted.The computational fluid dynamics method was used to analyze the effects of air pressure and liquid flow rate on the velocity and liquid phase volume fraction of the flow field inside the nozzle.The numerical results are in good agreement with the experimental test values,and the maximum error is less than 10%.The results show that when the water flow rate is constant,with the increase of air pressure,the velocity inside the nozzle gradually increases,and the liquid phase volume fraction decreases.The velocity distribution at the nozzle outlet became less uniform,while the liquid phase volume fraction distribution become more uniform.When the air pressure is constant,with the increase of water flow rate,the velocity inside the nozzle gradually decreases,and the liquid phase volume fraction increases.The velocity distribution at the nozzle outlet become more uniform,while the liquid phase volume fraction distribution become less uniform.When the air water pressure ratio is 1.1,the nozzle cooling uniformity is better,and the optimal working conditions for nozzle cooling uniformity are air pressure of 0.2 MPa and water flow rate of 180 L/h.