Numerical Investigation of the Cooling Flow Downstream of a Turbine Guide Vane Trailing Edge Slot

In order to investigate the flow characteristics of cooling flow downstream of a turbine guide vane trailing edge slot,numerical methods of RNG k-ε turbulent model were solved.Two-dimensional model for numerical study was established and boundary conditions were set based on operation conditions.The results show a reversed-flow region is formed at the tip of the pressure side due to the influence of the outside hot combustion gas and the pressure side tip thickness.The pressure gradient makes the coolant flow exit from the trailing edge slot first separates from the trailing edge cut-back,and then affected by the expansion wave,the coolant gas re-attaches the cut-back of the trailing edge after passing a certain distance.This article discusses the influencing factors on the flow of pressure side tip thickness,pressure side angle and the geometric shape of pressure side tip.This article also makes a comparison between considering the combustion gas outside and the case that the flow of combustion gas is not taken into account.