A New Experimental Method for Determining Port Generated Swirl Flow 2002-01-2846
A new optical-access steady-state test rig has been developed for the measurement of port generated swirl flow. A novel application of Particle Image Velocimetry allows non-intrusive / non-invasive flow visualization and full optical access of stationary in-cylinder flow. In the past, steady-state test rigs have provided Swirl numbers for the characterization of the flow. These traditional methods, however, do not provide any flow structure information. The new Swirl Optical Rig (SOR) provides instationary characterization of swirling motion including instantaneous and averaged flow images. A 2-valve swirl-port gasoline engine cylinder head was investigated to show the advantages of the new test rig. 3-D CFD simulations were also performed to better understand and validate the experimental results. Good correlation was obtained between the measured and simulated results for the case of well-established flow structures.