Research On Characteristics And Application Of Wave Fin Radiator In Engineering Vehicle

With the increasing intension of the traditional energy and the stringency of thevehicle emission regulations, designing a vehicles radiator，offering high efficiency, lowenergy consumption and small size, has gradually become an important approach fordesigners to save energy and reduce cost. Therefore, some performances of commonly usedwave fin radiator in engineering vehicle are analyzed by CFD technology in this paper,including the heat transfer performance and resistance performance of wave fin，theperformance prediction of radiator overall, parameterdesign and the application of radiator.Firstly, this paper studies the heat transfer performance and resistance performance ofwave fin radiator by using FLUENT software. The wave fin of radiator is simplified to themicro channel unite, and then the enhanced heat transfer mechanism of wave fin isdescribed by analyzing the inner temperature field and pressure field of the micro channelunite. In addition, heat transfer performance and resistance characteristic of corrugated fins,including triangle profile fin，triangle rounded corner profile fin and sinusoidal profile fin,are studied. At the same time, comprehensive performanceis analyzed comparatively bymeans of integrated evaluation factors JF and field synergy angle.The conclusion is drewas follows：the sinusoidal profile fin has the best working performance and the triangleprofile fin is the worst when the air speed is range from2m/s to16m/s.Secondly, combined with the orthogonal test method and Taguchi method, this paperstudies the fin performance based on different fin pitch, fin height, fin thickness, fin profileangle, fin corrugated angle and fin length under the same boundary conditions. Meanwhile,the sensitivity of the above geometric parameters to fin comprehensive performance isanalyzed. The conclusion is that the fin comprehensive performance is affected most by finlength and fin profile angle has little effect on it. The sensitivity order of other parameters,from high to low, is fin corrugated angle, fin pitch, fin height and fin thickness.Thirdly， based on the effectiveness-NTU method， this paper established the performance prediction mathematical model of the wave fin radiator and parametric designmathematical model, in which the heat exchanger radio and the resistance in air side aretreated as the design object and the multi-objective genetic algorithm is adopted.Additionally, the effectiveness of the mathematical models is verified through simulation onthe wave fin radiator of a certain type of loader. The conclusions of the study are as follows.：when heat exchanger radio is approximately constant, the air pressure loss of radiatorreduces by12.77%, while the air pressure loss is approximately constant，heat exchangerradio increases by7.53%.Finally，adopting engine compartment of a certain type loader as research object andreplacing entity radiator with heat exchanger model, this paper studies the flow fielddistribution of engine compartment and heat transfer effect of radiator in enginecompartment. Simultaneously，based on improving air resistance characteristics of importand export in engine compartment and optimizing air side resistance of radiator，twoimprovement schemes are proposed and the improvement effect is conspicuous.In conclusion，the research contents in this paper have some reference value for wavefin design and the research method can be applied to the research of other fin. Besides，theperformance prediction mathematical model and optimization mathematical model can beextended to other kinds of radiators. Finally，the improvement ideas of heat transfercharacteristics in engine compartment can be referenced in the design process of vehicleengine compartment.