Optimization Of Vehicle Cabin Ventilation Model

The air-conditioned car accounts for a large proportion of people’s daily life,airtight room bring comfortable temperature in car, but also because the interior spaceof automobile is narrow and limited, its structure is complicated, the contaminationinside automobile may produce very big damage to human health. Staying inside poorenvironment of automobile for long time, it is especially easy for drivers to lead to beabsent-minded, that increases possibility of road accident. The upholstery material isthe main source of pollutants in the car. The typical decoration materials of car cabin,optimization of car ventilation mode, the carriage structure and the decorativematerials, as well as vibration research on the impact of the vehicle cabin VOCtransport are researched in this thesis.Through testing VOC disseminating from six typical adornment materials underthe static and the dynamic environment in a small cabin environment, experimentalresults show that the vibration has different effect on VOC disseminating from sixtypical adornment materials, and the amplitude and frequency are also different toVOC disseminating from six typical adornment materials. Vibration can promoteVOC disseminating from the leather, ABS and PP, and reduce the other three kinds ofmaterial. Large amplitude is restrain VOC disseminating from leather and charpie,and promote several other materials; Frequency is larger suppress VOC disseminatingfrom leather and ABS, less effect to artificial leather, and promote several othermaterial. Frequency to VOC disseminating from charpie has more influence thanamplitude, and other material is just opposite.Multi-component gas such as VOC and air as the research object is taken andthree-dimensional model of vehicle cabin which is set up with a simplified vehiclecompartment is researched in the thesis. The numerical simulation platform with CFDis used to simulate the different ventilation modes, car structures and decorationmaterials. The ventilation mode in vehicle cabin is compared and analyzedqualitatively and quantitative about different air supply parameters, such as supply air speeds, angles, and vent location parameters, about different car structure, adornmentmaterial. Results showed that: When supply air speed increases and air supply anglereduce, VOC concentration gradually reduces; Return air mouth is double,it haslower VOC concentration than single;When return air mouth is double, the two are inthe front have lower VOC concentration than the tandem;Air ports has more and airsupply is vertical direction with air ports, the most beneficial is to the VOC; Alongwith other factors, obtained the best mode is that supply air velocityfor4m/s, supplyair angle for30°to45°, return air inletsin front and more air inlets; The car cabinsimple structure, small vector distance of air inlet position and return air inletsposition, low material send out rate and high supply velocities, are beneficial to VOCtransportation of the cabin.After simulation and verification of influence of the vibration on VOCdisseminating from cabin typical materials, VOC transport inside vehicles issimulated and analyzed from different amplitude and frequency characteristics underdynamic environment, the operation state. Get conclusions: VOC concentration islow under dynamic environment relative to the static environment.That is meanvibration is beneficial to the spread of VOC;VOC concentration is lower inside cabinwhen amplitude is lesser and frequencies is higher, and amplitude has more effect onVOC transport than frequency.