Study On Influence Of Geometric Parameters On Heat Transfer Performance Of Pillow-plate Type Intercooler

As the country's demand for infrastructure continues to increase,the efficiency and performance of construction vehicles need to be improved,so higher requirements are placed on the cooling system of engineering vehicles.The large amount of heat generated by the construction vehicle during its work is the main factor affecting its use.The heat exchange efficiency of the intercooler directly affects the working state of the engine.The uncooled charge air will significantly increase the engine fuel consumption and the harmful gas emissions will also increase.Therefore,research on the intercooler of construction vehicles contributes to environmental protection and improves vehicle performance.The new type of pillow-type intercooler has the advantages of simple manufacturing process,light weight and no clogging.In this paper,the simulation and experimental research on the new type of pillow-type intercooler are carried out to improve the performance of the excellent pillow plate type intercooler structure.Firstly,it introduces the analysis of the current status of heat sink research at home and abroad,gives the fluid calculation equations and related physical parameters and the evaluation criteria of the intercooler.According to the actual structure of the pillow plate heat exchanger,three kinds of convex heat dissipation unit models of elliptical,triangular and rectangular shapes of the pillow plate intercooler are constructed.The inflow direction angle and the flow gap height of the pillow plate type heat sink unit are given.Divide the grid,set boundary conditions and initial conditions for the heat sinks with different inflow direction angles and flow gap heights.Then,numerical simulations are carried out on three kinds of raised structure pillow-type heat dissipating units with different inflow direction angles and flow gap heights.The effects of different inflow direction angles and flow gap height on the resistance and heat transfer performance of the heat dissipating unit were analyzed,and the most suitable heat dissipating unit structure was selected according to the intercooler performance evaluation standard.The simulation results show that the triangular pillow plate type heat dissipating unit has excellent heat transfer performance when the inflow direction angle is 45° and flow gap height is 1 mm.Finally,according to the preferred bolster structure,the overall three-dimensional model of the slab-type intercooler is established,and the overall performance of the intercooler is simulated.Comparing the test and simulation data,the error is within 15%,indicating that the simulation results are usable.Compared with the different pressurized air flow rate and coolant flow rate,the heat exchange efficiency of the pillow plate type intercooler and the plate fin type intercooler is compared with the inlet and outlet pressure drop.It is known that the heat exchange efficiency of the pillow-type intercooler is higher than that of the plate-fin intercooler.Moreover,the unit mass heat exchange amount of the pillow plate type intercooler is also higher than that of the plate fin type intercooler unit mass.Rectangular projections are easier to manufacture than triangular projections,so rectangular raised pillow structures are preferred in terms of overall performance and manufacturing process.