Study Of Performance Analysis And Structural Parameter Improvement On Automotive Intercooler Based On CFD

At present,China’s automobile industry is in a stage of rapid development.Under the current pressure of energy conservation and emission reduction,engine fuel economy performance and emission performance have become important design indicators for automobiles.The supercharged intercooling technology improves the engine’s power,economy and exhaust gas purification,and has a positive impact on the current development of the automotive industry and environmental improvement.In this paper,the CFD method is used to carry out comprehensive numerical simulation analysis on the cooling flat tubes,cooling fins and cooling cores of key components affecting the performance of automotive intercooler,and the distribution of flow field and the variation of multiple performance parameters are obtained to analyze the influence of structural parameters on heat transfer performance and flow resistance performance.Then multiple structural parameters of the cooling core are improved to enhance its overall performance.(1)The performance comparison analysis was carried out for the cooling flat tubes with four different structural parameters.Firstly,the geometric model of the flat tube is built in the software SolidWorks,and simplified processing is carried out;then it is imported into the pre-processing software ANSA to complete the mesh division and establish the three-dimensional finite element model;then the numerical simulation of the finite element model is carried out in the software ANSYS Fluent,and the calculation results are post-processed.The pressure field,velocity field and temperature field distribution of the four cooling flat tubes are compared and analyzed.And their heat transfer performance and flow resistance were investigated by heat dissipation and pressure drop.Finally,their comprehensive performance was evaluated by dimensionless factors(j/f)1/3.(2)The performance comparison of the straight fins of seven different sinusoidal cross-section structures with different wave height,wave pitch and thickness was carried out.Firstly,seven fin finite element models were established and simulated.Then,the effects of fin structure parameters on heat transfer performance and flow resistance performance were studied under seven working conditions.The performance parameters examined included:cold air side Heat transfer coefficient,heat flux density,heat dissipation and pressure drop;finally,the sensitivity of each structure parameter to performance is further analyzed.(3)The performance comparison analysis and improvement of the cooling core of the intercooler are carried out from three aspects:tracheal diameter,gas chamber structure and cooling flat tube.and the effectiveness of the improvement scheme was verified under multiple air intake conditions.On the whole,through the improvement of the structural parameters of the cooling core,the heat transfer performance and flow resistance performance of that are improved to a large extent compared with the original cooling core.The research methods of solid modeling,simulation analysis and structural improvement can significantly shorten the cycle and cost of intercooler development.These results provide an important theoretical basis for the improvement of intercooler performance,and have certain guiding significance and reference value in practical engineering applications.