This paper presents a new and cost-effective design for automotive engine mufflers using the swirl phenomenon. The new design results have been compared with the commercial mufflers with and without a catalytic converter and have shown that the noise level is competitive at high rotational speeds, that there is a reduction in back pressure up to 60 per cent which ultimately reduces HC and CO, and that there is an improvement in combustion efficiency of up to 2.11 per cent.
SyredN.BeerJ. M.Combustion of swirling flows. Combust. Flow, 1974, 23, 143–187.
6.
O'DohertyT.BiffinM.SyredN.The use of tangential offtakes for energy savings in process industries. Proc. Instn Mech. Engrs, Part E: J. Process Mechanical Engineering, 1992, 206, 99–109.
7.
StockelM. W.StockelM. T.JohnsonC.Auto service and repair, 1998 (Goodheart-Willcox, Tinley Park, Illinois).
8.
Emission subsystems - catalytic converter, 2003 (Toyoto Motor Sales, USA, Torrance, California).
9.
FrickW.GriffithsJ.O'DohertyT.Visualisation of processing vortex core in an unconfined swirling flow. Opt. Diagnostics Engng, 1991, 2, 19–31.
