The influence of spill-line geometry on a spray generated by a pressure-swirl atomizer

Milan Malý, Lada Janáčková, Jan Jedelský, Miroslav Jícha, P. Dančová, M. Veselý
2016 EPJ Web of Conferences  
An experimental investigation of characteristics of spray generated by a pressure-swirl atomizer (spill-return type) was performed using shadowgraphy and Phase-Doppler Anemometry (PDA). Several different geometries of the spill-return orifice were tested in terms of a spray stability and quality on a cold test bench. PDA measurement yields a drop-size distribution and velocity data while the shadowgraphy unveils a break-up process in detail. Performed measurements reveal significant differences
more » ... ificant differences in spray characteristics as well as differences in spray stability. The results suggest that the air core, formed inside the swirl chamber, passes through the spill orifice, which causes instability of the inner flow. These instabilities lead to a chaotic state of sheet breakup resulting in shortening of breakup distance. Obtained findings are used to propose possible changes in the atomizer design for improvement of its performance. This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits distribution, and reproduction in any medium, provided the original work is properly cited. XQUHVWULFWHG XVH
doi:10.1051/epjconf/201611402070 fatcat:gaqu5tpvbzgd5dlppoqmjz74ze