Simulation And Experimental Study On Temperature Field Of Vehicle Cabin

With the coming of technological era, vehicle comfort becomes more and more important. Automotive air-conditioning could keep the temperature, humidity, cleanliness of cabin air in a reasonable range to improve the comfort of vehicle thermal environment. Therefore, the air conditioning control and flow field analysis has always been a hotspot in vehicle study.Firstly, this paper describes the current status of how CFD is applied to numerical simulation of cabin temperature field in homeland and abroad. It also introduces the simulation methods and mathematical models of cabin flow field and temperature field. Secondly, taking cabin cooling performance as the research object, this paper uses Fluent simulating cabin flow field and temperature field, then designs an experiment to test the cooling performance at the central vent and driver head. The paper verifies the validity of the model according to the comparison of simulation results and experimental results. According to the distribution of cabin flow field and temperature field, it proposes an improvement project and makes simulation analysis.Through experimental studies and model simulation, it can be concluded that: First, the method of semi-structured mesh model is feasible. Second, through the comparative analysis of cabin temperature field experiment, the simulation model is accurate and reliable. Third, optimizing the structure parameter can improve the cooling performance of the air conditioning.(1) Increasing the outlet area can improve the distribution of flow and temperature fields. The outlet area increases from 70 mm * 90 mm to 100 mm * 100 mm, which can reduce the temperature of 30 K.(2) Increasing the number of outlet can effectively reduce the temperature of the cabin. When outlets increases from 3 to 5, the front part can cool up by 35 K while the rear part 25 K.(3) Changing the outlet location can also improve the cooling effect of the cabin. Setting outlets in the B-pillar, the front cabin can cool up by 30 K while the rear 25 K.(4) In terms of cooling performance, three structural parameters all make a significant improvement. Increasing the outlet number is the best, increasing the outlet area is the second, and changing the outlet position comes last.