标题：STUDY ON THE EFFECT OF TURBULENCE MODEL ON THE FLOW AND HEAT TRANSFER IN THE MEANDERING CHANNEL BASED ON THE PRINCIPLE OF HIGH EFFICIENCY AND ENERGY SAVING
摘要：The selection of turbulence model and wall function is very important to solve the flow and heat transfer. By studying the flow and heat transfer characteristics in the winding path of turbine blades by different turbulence models, the mechanisms of the effect of different turbulence models and wall functions on the calculation were revealed. The research results show that the turbulence model has a great influence on the calculation results of flow and heat transfer under the same boundary conditions, but the turbulence model has little effect on the static pressure coefficient. In CFX, the heat transfer results calculated by the Scalable Wall Functions are higher than the results from the Automatic Wall Functions. Compared with the experimental results, the meandering channel heat transfer results from the Realizable k — s turbulence model and Scalable Wall Functions are ideal, while the SST turbulence model is better than other turbulence models. Choosing the reasonable dissipative equation and estimating the accurate turbulent kinetic energy near the wall can affect the calculation results of the turbulence model.
关键词：Meandering channel;turbulence model;flow field;heat transfer;wall function;high efficiency and energy saving
