Research Of Heat Transfer Enhancement On The Bionic Nonsmooth Surface By Impinging Cooling

With the rapid development of science and technology, the usage rate of the energy efficiency has become a national symbol of industrial technology level. Gas turbine is a kind of high efficient power plant, the usage rate of energy efficiency is rising year by year. The cooling technology of high-temperature components has become the key to the initial temperature of gas turbine thermal efficiency and the leaf.In recent years, bionics is developing rapidly. Through the perspective of bionics structure, the thermal protection problem has become a new hotspot. The papers remains lack, which introduced the literature of the bionic structure about the heat transfer performance and the problem of material thermal fatigue on gas turbine transition piece model. Based on the above background and the structural characteristics of a transition piece, this study focus on the heat transfer on the target surface, referring to the surface of conch shell. The cooling augmentation about difference surfaces was achieved through the numerical simulation about a series of impingement cooling patterns.In this paper, we study on the convex hull, pits and rib bionic structure effect on the temperature of the target surface. The study was achieved through Realizable k-epsilon turbulence model in the Fluent software. Compared with the bionic nonsmooth target surface and the smooth surface, the paper will analysis the heat transfer effectiveness, temperature distribution on the target surface and flow flied characteristics in the coolant chamber. The Particle Swarm Optimization(PSO) was employed to research the impinging cooling performance of the bionic structure parameters, such as detached space and diameter ratio. All the simulation results under different conditions show that the bionic target surface has a good performance in enhancing cooling effectiveness and protecting high-temperature components.