Study on thermodynamic matching optimization of variable flow cooling system of diesel engine at high altitudes

作者：Chunhao Yang, Ruilin Liu, Yufei Jiao, Zhongjie Zhang, Guangmeng Zhou, Haojian Ding, Chenqi Lu · 发表于：Energy Sources Part A Recovery Utilization and Environmental Effects · 年份：2020 · DOI：10.1080/15567036.2020.1769777 · 被引用次数：6 · 研究领域：Advanced Thermodynamic Systems and Engines、Refrigeration and Air Conditioning Technologies、Aerodynamics and Fluid Dynamics Research

It is significant to matching optimize of variable flow cooling system for diesel engine at high altitudes, which is helpful to enhance the power and economy, improve the thermal efficiency, and control the heat load of the diesel engine. The experimental design based on the Latin hypercube sampling method was carried out, the collaborative optimization method of variable flow cooling system control parameters based on Genetic Algorithm (GA) was established and the map of cooling fan speed and cooling water pump speed under the condition of variable altitudes (0 m ~ 5500 m) was obtained, which were based on the coupled model of diesel engine and cooling system. Results indicated that as the increase of altitudes, the convective heat transfer coefficient of the air side of the radiator and the cooling fan head decreased, the fan head decreased by 7.24% on average for every 1000 m rise. After optimizing the control parameters of the cooling system at different altitudes, the temperature field of the heated parts was ranked from high to low, which was piston, cylinder head and cylinder liner, and the heat load of the three parts was not over the limit value. Compared with the original engine, after the application of variable flow cooling system, the power and torque of the diesel engine increased, and the higher the altitude was, the more obvious the increase effect was. In the low- and medium-speed region (n ≤ 1500 r/min), the increase effect of the power and torque of the die...