1 research outputs found
Definition of wind blowers for vehicles testing at chassis-dyno facilities using a CFD approach
[EN] The need to increase measurement accuracy of fuel consumption and pollutant emissions
in vehicles is forcing the market to develop chassis-dyno test cells that reproduce on-road
conditions realistically.
Air-cooling is key to vehicle performance. It is therefore critical that the design of a test
cell guarantees realistic cooling of all vehicle components, as important errors in fuel consumption
and emissions measurements may otherwise arise. In a test-room, a blower
placed in front of the vehicle supplies the cooling air. While there are some guidelines in
the literature for the selection of fans required for emissions measurements for standard
driving cycles, the information for designing the air supply system for specific tests in other
areas is scarce.
New Real Driving Emissions (RDE) legislation will force manufacturers to perform onroad
measurements of pollutants. This represents a significant challenge due to the variability
of conditions coming from non-controlled parameters. In order to optimize vehicles,
different tests are performed in cells equipped with a chassis-dyno where the on-road flow
field around the vehicle is reproduced as closely as possible.
This work provides some guidelines for the definition of the airflow supply system of
chassis-dyno facilities for vehicle optimization tests, based on a CFD analysis of the flow
characteristics around the vehicle. By comparison with the solution obtained for a vehicle
in real road driving conditions, the exit section of the blower and the distance between the
blower exit and the car that best reproduce realistic on-road flow conditions in a test room
are determined.
2017 Elsevier Ltd. All rights reserved.Broatch, A.; Margot, X.; Gil, A.; Galindo, E.; Soler, R. (2017). Definition of wind blowers for vehicles testing at chassis-dyno facilities using a CFD approach. Transportation Research Part D Transport and Environment. 55:99-112. doi:10.1016/j.trd.2017.06.029S991125