Experimental investigation on the effect of pulsations on turbulent flow through a 90 degrees pipe bend

Authors: Kalpakli Vester, A., Örlü, R., Tillmark, N.T., Alfredsson, P.H.
Document Type: Conference
Pubstate: Published
Journal: 3rd Int. Conf. on Jets, Wakes and Separated Flows, Sept 27-30, 2010, Cincinnati, Ohio, USA
Volume:    1-6
Year: 2010


Pulsatile turbulent flows in curved pipes at high Dean numbers are prevalent in various components of internal combustion engines, particularly the intake of exhaust manifolds. Despite their technological importance, there is a clear lack of experimental data. The present paper provides preliminary, albeit unique, data from an experimental investigation, thereby addressing this gap and depicts impressions of the phase evolution of the complex flow including a back flow region. It is also shown, that due to the scale separation of the pulsations and the turbulence, the pulsatile flow can statistically be decomposed into its large-scale pulsations and the steady case.