Heat Balance Of Small Hydraulic Excavators Power System

As the core of the power system of Mini-Hydraulic Excavator, theperformance of the engine will affect its work directly. Aiming at theproblem in current domestic Mini-Hydraulic Excavator, which is thewater inlet temperature of the engine is too high, using computersimulation technology and interrelated theory, the heat balance of thepower system of Mini-Hydraulic Excavator is studied.First, the heat balance theory is analyzed, and the engine heatbalance model is proposed. Through testing the parameters of the model,the theoretical basis of designing rational cooling system in engineeringapplication is proposed. By this, the matched cooling system is designed.Then, through experiments, the main factors which affecting heat balanceare analyzed. Basing on this, and using the FLUNET software, the heattransfer of complicated flow in water radiator is simulated and analyzed,and the water radiator cell element model is founded, and the fluidtemperature field is studied. The simulation result and the experimentresult have matched basically, verified the rationality of the model. Then,through simulating heat transfer in different ambient temperature byusing the model, a calculated formula of the ambient temperature andtotal heat dissipating capacity is proposed. And it has important guidancesignificance in researching heat balance of the power system ofMini-Hydraulic Excavator.Finally, under the condition that the parts such as radiator areunchangeable, through measuring the air speed of survey point, theinfluence of disposal of structure on heat balance is observed, and theimproved design of the radiating system is proposed. It has importantsignification in the design of the cooling system.