高浓漂白塔底稀释区旋转喷射管数值模拟

Numerical Simulation of Rotating Spray Tube with Low Speed

关键词:  Realizable κ-ε湍流  喷射  PIV  漂白塔

Key Words:Realizable κ-ε  spray  PIV

摘要:通过Fluent的Realizable κ-ε湍流模型以及多重旋转坐标系（MRF）技巧,对高浓漂白塔底稀释区旋转的直形和纺锤形两种喷射管进行了正反向几种转速的数值模拟，并对其各个出口的核心速度进行了采集和分析，然后利用粒子图像测速仪（PIV）对该模型进行了验证。结果表明，直形喷射管反向旋转转速10 r/min左右时，其各个出口的速度差值较小；纺锤形喷射管在正向旋转转速50 r/min下，其各个出口的速度差值最小；低转速的旋转喷射管在这两种条件下均可以视为等速喷射。用Realizable κ-ε湍流模型以及MRF技巧对旋转喷射水管进行数值计算和分析是可靠的。

Abstract:Based on Realizable κ-ε turbulent model and MRF technique in Fluent, the two kinds of rotary spray tube such as straight and spindle ones were simulated under different forward and reverse rotating velocities, and the core velocities of each outlet were collected and analyzed. Then PIV system was used to validate the model. The results showed that the outflow velocity difference of the straight-type spray line is the smallest when the angular velocity is about 10 r/min with the reverse rotation. While for the spindle spray line, the outflow velocity difference is smallest when the angular velocity is about 50 r/min with the forward rotation. The sprays of rotary spray tube under low rotation speed can be considered as the constant velocity sprays in these two conditions. The numerical simulation results agreed with the PIV experiment data. So both Realizable κ-ε turbulent model and MRF technique are reliable and the calculated results are correct.