Hydraulic Excavator Engine Cooling System Performance And Operating Parameters Match

Engine cooling system is the key of guaranteeing the hydraulic excavator's normal operation and highly active working. This paper aimed at some common problems existing in the design process of hydraulic excavator's cooling system and researched the combination property of engine cooling system systematically, combined with the national program 863 and enterprise's key scientific research program. In this paper, MATLAB/GUI toolbox has been used to compile the engine cooling system's analysis software. It has provided theoretical guidance for the designers to improve the cooling system. This paper's main work is as follows:Firstly, the research development status and tendency of national and international engine cooling systems have been summarized. Radiator type for common use has been introduced, and plate-fin radiator's heat-transfer mechanism has been revealed.Secondly, the numerical mode of louvered fin-and-tube radiator's thermal characteristics has been established. The relationship between some performance parameters, such as radiator's heat transfer coefficients, temperature of cooling water, heat dissipation, windage resistance, water resistance, power dissipation and the size of radiator and velocity of fluid has been analyzed. Some experiments based on the SWE50 hydraulic excavator's cooling system have been used to prove the mode. Meanwhile, the engine cooling system's analysis software has been compiled by using the MATLAB/GUI toolbox, and then users could get relevant performance curves and performance parameters by using GUI interface to input cooling system's corresponding size-parameter and working parameter and do some calculations though analysis software.Thirdly, engine cooling system's wind channel has been cut up and simplified, an optimized scheme of shutter type wind channel has been put forward, which is based on the common scheme of round hole wind channel. The two types of schemes have been analyzed by using FLUENT numerical simulation software. Meanwhile we got the changing discipline between wind speed and wind resistance by calculate the round hole air outlet channel's grid mode. At last, the cooling system's optimize and match numerical mode has been built based on the SWE50 hydraulic excavator's cooling system. The radiator's size parameter, water discharge parameter and wind speed has been matched by using the MATLAB genetic algorithm toolbox.