Research On Heat Dissipation Performance Of Water-cooled Intercooler In Construction Machinery Dual-cycle Cooling System

The engine power is large,the fuel consumption is large,and the heat generation is large during the construction machinery operation.In order to improve the combustion efficiency of the engine and provide more power,it is necessary to equip with turbocharging.In order to solve the adverse effect of the significant increase in the charge air temperature caused by turbocharging,it is necessary to cool the high-temperature air.Install an intercooler between the turbocharger and the engine intake manifold.The main role of the intercooler is to cool the pressurized air that is about to enter the engine.After the intercooler is equipped,the air intake efficiency is improved,so that the engine burns more fully,while the engine power is increased,and the pollution caused by exhaust emissions is reduced.First,a brief introduction is made to the intercooler,including the equations used in the simulation calculation of the engineering software fluent,the evaluation method used to analyze the simulation results,the physical property parameters of the cold and hot side fluid required for the simulation,and the network The influence of the number of grids on the simulation results was analyzed with grid independence.The pre-processing of the cold and hot side unit body simulation is introduced,including three-dimensional modeling,model meshing,setting fluid inlet and outlet and wall boundary conditions.Then,starting from the internal structure of the water-cooled intercooler,the effect of the fin structure on the cold and hot side of the intercooler on the overall performance of the water-cooled intercooler is studied.The fin structure parameters of the hot side unit body are mainly the fin tilt angle,the ripple pitch,Fin height,fin thickness,and fin amplitude.The structural parameters of the cold-side unit body are mainly fin height,ripple pitch,fin staggered tooth length,and fin staggered tooth thickness.The single variable method was used to study the influence of the changes of various parameters on the heat transfer performance and resistance performance of the unit body.The temperature cloud diagram,pressure cloud diagram and velocity cloud diagram in the simulation results were observed and compared in three aspects,and finally through a comprehensive evaluation factor The effect of changing the value of each parameter by j / f on the comprehensive performance of the unit body is compared to obtain a better fin parameter value.Finally,the overall structure of the intercooler is studied from the aspect of internal fin structure.The porous medium method is used to simplify the intercooler with complex internal structure,which can save computer resources.The secondary cross-flow intercooler is compared with the primary cross-flow and tertiary cross-flow.Through the observation and comparison of the temperature cloud,velocity cloud and pressure cloud,the heat dissipation from the heat dissipation,pressure drop,Q / ΔP,unit volume After comprehensive comparison of the quantity and heat dissipation rate,the comprehensive performance of the secondary cross flow is better.In the same way,after comparing the intercooler with a long flow path on the gas side and the intercooler with a short flow path on the gas side,the overall performance of the intercooler with a long flow path on the gas side is better.Then,the water-cooled intercooler is compared with the traditional air-cooled intercooler of a construction machinery enterprise,and the evaluation and analysis are mainly from the aspects of heat dissipation and pressure drop.The overall performance is better.Finally,the simulation results are compared with the test data.The comparison between the two sets of data shows that the difference between the simulation results and the test data is small,which verifies the feasibility of the computer simulation method for the design of the intercooler model structure.