Numerical Simulation Of Heat Pipe Turbine Blade Cooling Technology

Due to the continuous development of aerospace technology,the performance required by turbine engines is getting higher and higher,which requires the engine to continuously increase its own output power,and the output power of the turbine engine is closely related to the temperature of its intake port.Therefore,the inlet temperature of the turbine engine is gradually increased every year as required.In order to ensure that the first-stage stationary blades of the turbine engine are in a safe and reliable working environment and prevent creep,fracture,etc.,the blades need to be cooled,and the technology of blade cooling has become particularly important.In this paper,a blade cooling method with built-in heat pipe is proposed.The feasibility and working principle of the blade cooling technology with built-in heat pipe are studied by numerical simulation.The expected effects are analyzed theoretically.The relevant research contents of this paper are as follows:(1)Calculated the numerical value of each heat transfer limit in the liquid metal sodium heat pipe,and found that the capillary limit is the most important factor affecting heat transfer,and the working temperature,fiber diameter and porosity of the heat pipe are the main factors affecting the capillary limit And calculated the maximum capillary limit and the value of the heat pipe structure size parameter at this time.(2)A two-dimensional simplified model of the heat pipe cooling blade was constructed,and its working process was numerically simulated and analyzed to more accurately simulate the capillary force and phase change process inside the wick,verifying the feasibility of the model and being the follow-up work Progress is paving the way.(3)Establish the equivalent heat transfer model of the three-dimensional blade dredging structure,conduct overall thermal resistance calculation and theoretical analysis,verify the reliability of the theoretical model of its working process,and design the fins at the bottom of the blade that can achieve good performance heat exchange The structure greatly reduces the overall temperature inside the blade.A single increase in inlet speed and temperature will increase the overall temperature of the blade,but it will remain stable and conform to the average temperature characteristics of the heat pipe.