Design And Optimization Of Cooling System For DT Heavy-duty Truck

As the car ownership is growing rapidly, the energy and environmental problems become more and more serious. Now automotive technology is developing in the direction of the intelligent. As the part that ensures the automobile engine to work, cooling system has direct influence on engine emissions, fuel consumption, and durability of technology parameters. While the current technology of the cooling system of heavy duty truck is still not advanced, which can not adjust the heat dissipating capacity according to the actual demand and causes the waste of energy. In order to meet the increasingly stringent fuel consumption and emissions regulations, enhance the competitiveness of the products and achieve the purpose of energy-saving and emission-reduction, this paper, which takes DT type heavy duty truck as the prototype, conducts a research on the basic model of cooling system by the method of numerical simulation and bench test, optimizes the engine cabin and the flow field in the cooling system structure and carries out the following work.1) The CATIA model of the DT type heavy duty truck is established and processed by ICEM. The FLUENT is used to deal with the former, and the 3D model of CFD is obtained. In addition, by using the GT-SUITE series software, the one-dimensional model of six cylinder turbocharged and one dimensional model of the cooling system are established according to the test data. Through the calculation of data transmission, a three-dimensional coupled model is obtained, which offers the support of model for the research of cooling system.2) The flow field in the engine room is obtained by using the one / three dimensional coupling model, and the improved plans is put forward according to the flow field in the engine room. The two plans are changing the structure of fan and installing the wind deflector. The two improvement measures are analyzed and compared with each other on the influence of the inner flow field. The conclusion is drawn that the air intake efficiency of the integrated fan is increased by 3.08% compared with that of the ordinary fan. After the installation of the wind screen, and the flow air through the radiator increased by 6.36%. 125 mm shroud can obtain maximum air. Flow through the radiator of the mass flow rate increase by 3.68% by means of adding baffle flow plate.3) The engine test platform research is carried out and the car engine test bench is set up. The test platform not only can be used in the experimental study of the energy distribution of the engine, but also can be directly used to carry out the research on the optimization of the vehicle cooling system. The cooling capacity of the engine is measured, which provides the experimental basis for the experimental study of the subsequent cooling system and expands the methods and means of the engine thermal management bench test research.