- Category Technical paper
- Related event International Congress : SIA Powertrain - Rouen 2014 - 21 & 22 May 2014
- Edition SIA
- Date 05/21/2014
- Author L. Postrioti, G. Buitoni - Università di Perugia | C. Ungaro - Loccioni Mobility | M. Mosser - Continental Automotive
- Language English
Type PDF file (1.02 Mo)
(Downloadable immediately on receipt of online payment)
- Number of pages 10
- Code R-2014-02-39
- Fee Free
In the present paper, the results of an experimental campaign aiming at the analysis of an urea-water solution (UWS) injection system are presented. UWS is used as reductant agent to control NOx emissions in the exhaust of automotive Diesel engines. In this research, a UWS dosing system was tested in a hot air flow tunnel, developed to investigate the spray behaviour in operating conditions similar to those present in Diesel exhaust systems, while allowing an adequate optical access for both spray imaging and Phase Doppler Anemometry (PDA) measurements.
The present research activity is divided into three parts. In the first one, PDA measurements were conducted in order to get reliable data about spray velocity and droplets sizing, varying the temperature of the air flow UWS is injected in. In the second part, an imaging technique was adopted to visualize the spray global characteristics, such as the spray spreading and the UWS mass distribution in the pipe. In the third part of this work, the same imaging technique was used to focus the attention on small portions of the spray, to achieve an indirect measurement of droplets diameter thanks to a non-commercial image post-processing software.