Numerical Simulation, Smooth And With The Spoiler Blade Internal Rectangular Straight Channel Cooling

The cooling technique of the blade inner passage plays a significant role in the design of blades for gas turbine. The decrease of the blade wall temperature is one of the important research aspects to improve the performance of gas turbine. Because of the complexity of the blade inner passage and the reality, the numerical research method can overcome some limits of the experimental research method. The flow and heat transfer in the blade inner passage is studied by the numerical simulation in the thesis.Based on the analysis of the simplified geometry of the passage and the flow in the passage, a three-dimensional incompressible turbulence model was built. In this thesis, the governing equations for convective heat transfer were discretized by the finite volume method and were solved by the SIMPLEST. The whole field discretion and whole field solution method is used for the convection-conduction conjugate problem.The flow and heat transfer process in the smooth rectangle straight passage, rectangle straight passage with the sequence rectangular fins, rectangle straight passage with staggered rectangular fins, rectangle straight passage with slant rectangular fins rotating 7(-7) and rectangle straight passage with slant rectangular fins rotating 15(-15) are simulated for Reynolds number in the range 1x105-4x105. The thesis provides the temperature field, pressure field, and velocity field for the passages under different Reynolds number by changing the inlet velocity of the liquid. By the comparison and analysis of different kinds of passage, it is found that the increase of the inlet Reynolds number and the addition of the fins both can achieve lower wall temperature. The performance of the passage with slant fins is much better. Under the same inlet Reynolds Number, the performance of the passage with slant fins is 2.6 times of that of the passage with staggered fins, and 6.6 times of that of the smooth rectangle straight passage. Based on the computational results, the correlation between the Nusselt number, friction factor and Reynolds number are also given.