Abstract—
The poor mixing in gaseous injection mixers is
one of the culprits for unsatisfactory engine performance and
lethal exhaust emissions. Thus, effect of injection frequency on
the mixing in Throttle Body Injection Mixer (TBIM) for a CNG
motorcycle was studied in this work through Computational
Fluid Dynamics (CFD) simulation. Injection frequencies of 1,
2, 4, 5 and 7 injections per engine cycle had been investigated
using the RNG k-ε turbulent model. CFD results revealed a
significant effect of various injection frequencies on the
hydrodynamics of air and fuel in TBIM. It was found that the
injection frequency of 4 injections per engine cycle was the
most optimum one throughout the case studies.