Numerical study of condensing flow based on the modified model

作者：Zhang, Guojie; Zhang, Sen; Zhou, Zhongning; Li, Yimin^*; Wang, Liang; Liu, Cong

来源：Applied Thermal Engineering, 2017, 127: 1206-1214.

DOI：10.1016/j.applthermaleng.2017.08.133

• Condensing flow
• Modified model
• Wilson point
• CFD

Condensation phenomenon is very common, whether in the steam turbine or refrigeration cycle. This paper firstly numerically studies the Moses and Stein nozzle focusing on condensing flow. Both the modified model and the original model are calculated, besides the results are compared with experimental data to verify the correctness of the numerical simulation based on the error analysis. The results show that the modified model is more accurate than the original model in predicting the Wilson point position and its thermal parameters. Additionally, the pressure will rise due to the release of latent heat in the condensation process, and the nucleation will only occur when the vapor supercooling reaches a certain level, about 18 K. The nucleation rate will reach its maximum when the vapor supercooling reaches maximum, which is defined as Wilson point. In two-dimensional Dykas cascade, the modified model can more accurately predicted the blade surface pressure distribution and flow field characteristic than the original model. Finally, the modified model is applied in three-dimensional steam turbine cascade, and the parameters of flow passage centerline along the spanwise direction are investigated in detail.

• 出版日期2017-12-25
• 单位中国矿业大学（北京）