Analysis of the impact of motorcycle radiator shield structure on its inlet air volume
To protect the radiator from soil contamination,a radiator shield is needed at the inlet of the radiator.However,the addition of radiator shield exerts a huge impact on the inlet air volume of the radiator.To obtain an optimal design of the radiator shield structure,the CFD analysis method is employed to build a computational domain model for the external flow field of the motorcycle.The impacts of different radiator shield structures on their inlet air volume are analyzed and a suitable radiator shield scheme is selected for vehicle experimental verification.Our results show with an angle of 130° on the guide plate of the radiator shield and a gap of 1 mm between the radiator shield and the core,the inlet air volume of the radiator is 281.7 g/s,which is equivalent to the inlet air volume without a shield.As the gap between the shield and the core body increases the inlet air volume of the radiator,it should be controlled at 1～2.5 mm.The inclination of the hole on radiator shield and the opening of the guide plate are not conducive to increasing the air volume.Our comparative tests show the engine water outlet temperature stays basically the same before and after adding a radiator shield under idle conditions,maximum speed conditions,and maximum torque conditions.Properly reducing the windproof area of the fan cover further increases the inlet air volume of the radiator.After adding a shield to the radiator,no hot air is found between the motorcyclist's thighs.Our research may provide some valuable references for the design and optimization of the radiator cover structures of motorcycles.
motorcyclesradiatorshieldengine water outlet temperatureinlet air volume
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