Optimization Design Of Automobile Sunroof Based On Flow Field Analysis In Cabin

The air circulation of the car’s internal environment is an important factor affecting the driver’s driving safety and the occupant’s experience.With the development of automotive technology,the sunroof has almost become the standard configuration of the car,has an important impact on the flow field in the cabin.The influence of different sunroof structures on the flow field in the cabin are mainly studied.By using SolidWorks software to model the BJ80,and then using the Flow Simulation plug-in to simulate the flow field in the cabin when the sunroof is fully open at a wind speed of 22 m / s.The trajectory map of the air flow in the car cabin and the air velocity and pressure at various positions are obtained by simulation.For the three rows of seats,one point was selected for each of the occupant’s face and feet to detect wind speed and air pressure,and the defects of the flow field in the cabin when the small sunroof was fully opened were analyzed.Then proposed three optimization design directions of the sunroof,including adding the deflector structure,increasing the size of the sunroof and changing the position of the sunroof.The three optimization directions were modeled separately,and simulations were performed under the same conditions.Comparing the results,the analysis shows that the vehicle with the small sunroof structure has the most internal flow field defects,and the vehicle with the double sunroof structure has the best internal flow field.The non-uniformity coefficient method was used to evaluate the occupant comfort of each model.The experimental results of small sunroof and structural models with deflectors were experimentally verified.