Analysis And Optimization Of Grader Cooling System Based On1-D Simulation

With the accelerated pace of urbanization and vigorous development of nation-building, as an important engineering machinery, grader is more and more popular.In order to meet people’s needs and the regulations, cabin thermal management is paid more attention. Generally, the working environment of grader is severe and easily lead to inadequate cabin cooling, the variety of heat sources and heat sink in a small cabin layout exacerbate the situation. In this paper, for the problem of inadequate cooling at low speed and high load conditions, proceeding from the air flow of cabin and heat exchange of cooling package. GT-SUITE was applied to simulate the velocity, pressure, temperature field and air flow in cabin and analysis the effect of structure of cabin and the radiator’s layout to the cooling package’s radiating.Firstly, simplify the Pro/E model acquired from the enterprise. Not to simplify the key research area-cooling package and treat the exhaust system and oil tank as a simple organism. For the wheel and the chassis, because it has almost no effect on the flow of air inside the cabin and cooling, and therefore are not considered, for the internal of cabin, treat the area from oil tank to engine as closed due to its various components are arranged but the neighborhood of the cooling package should to be modeled according to its real structure. Establish a coordinate in the Pro/E model, measure all the coordinates of components needed to be considered in the cabin. Building the quasi-three-dimensional model of the cabin air side in COOL3D according to the measured coordinates, subsequently disperse it and generate a one-dimensional module. Input the one-dimensional model in the SubAssemblyExternal module and together the liquid-side module with SubAssemblyExternal module then generate air-side one-dimensional module the article needed.Then, set the boundary conditions with the model to calculate. Analyze the velocity, pressure, temperature field and air flow in cabin, especially the cooling package. According to the results of analysis, three advanced solutions was proposed:Firstly, research on if the increasing speed can bring the cooling package’s amount of radiating is increasing; Second, optimizing the cabin air intake grille’s location and size to increase the cooling air’s flow; Third, improving each radiator and condenser arrangement of the cooling package to make the cabin for optimal heat dissipation.Last, simulate the optimized solutions. By changing the air intake grille, gearbox oil cooler and the condenser’s location, adding the number of intake grille around the fan, adding to bulkhead and making match analysis of radiator, the cabin cooling package’s air to air intercooler, gearbox oil cooler, water tank radiator’s heat dissipating quantity are increased to29.60kW,23.12kW and121.85kW, which can meet the cooling requirement.