Research On Flow And Heat Transfer Mechanism Of Latticework Cooling Geometry In Turbine Blades

As an important industrial equipment,gas turbines have been widely used in industrial fields including aviation, marine, locomotive, energy, etc. Bearing extremely important task to protect people's lives and safety. As the supply of traditional fossil energy sources increasingly tense, efficiency and economy of energy power plant gradually become the focus of scientific research and engineering personnel concerned. For the gas turbine, the turbine inlet temperature which increases the overall thermal efficiency has a very important significance. As a key technology to improve hot end of the rotor inlet temperature, blade cooling become a hot area of research. Through the study of latticework channel, heat transfer characteristics at different Reynolds number conditions and different inlet angle conditions have been acquired. By using the large eddy simulation and other research methods, its internal flow field characteristics of working conditions has been obtained in order to acquire a more accurate analysis of the heat transfer characteristics. By studying the latticework model with different inlet angles, it's showed that inlet angle has little influence to heat transfer characteristics of imported geometry. For certain imports geometry model,when the Reynolds number is increased,its Nu value increases with Reynolds number. Using large eddy simulation (LES) method to calculate the case of flow and heat transfer characteristic under Re = 30,000 working conditions. Through the flow line analysis,cross-sectional analysis of the velocity vector,and the use of eddy identification methods,the results found in staggered Passage, along the sub-channel direction there were extensive longitudinal eddy.The unique folding feature of the subchannel is the main reason these groups generated nest.In addition, the sub-channel interdigitated flow characteristics also has a significant impact on the development of these eddy groups. Furthermore, a laser-based measurement technology Particle image velocimetry velocimetry (PIV) experiment station has been built, in order to acquire the sub-channel feature information of the internal flow field of enlarged the physical model geometric of cross rib.