Abstract
This paper presents a method for predicting the in-cylinder gas flows during the intake stroke of four-stroke engines. A simplified engine model with a deep-bowl piston configuration, and a central intake valve was used. An inviscid two-dimensional axisymmetric flow was investigated. The model used a finite difference procedure with an expanding/contracting grid in axisymmetric representation. The major source of troubles for the convergence of the solution was the unsteady turbulent jet flow issuing from the intake valve which required very small time intervals for the solution compared with that during the compression stroke where there is no jet flow exists. Results show a complicated flow field during the intake stroke in engine like-geometries.
Highlights
The combust.ion ra Le > [uel-a iT' mi.-..;ing, ell~i ne DeI" f'orrn2lnr;e and f'ormat.ion of polluLant,s of an en~ine are all highly dependent, on t.he 1'10. 1'ield Lhat.. exist.s in t..he en~~ne cvlinder
E.B.Zedan and M.H.Awad combu~Lion process [2,3] IL is clear LhaL Lhe Clo~ during Lhe compression sLroke is sLrongly inCluenced by Lhe iniLjal condiLions aL Lhe beginning or compression sLroke. i,e., Lhe end or inLake sLroke
The ell~in€ospeed of roLaLion is so high during Lhe inLake process LhaL Lhe flo~ is modeled via a lar~e inviscid core plus a small Vl.SC:')lIS boundary l;jyer aL Lhe ~alls as convenLionally done in aerodynamics
Summary
The combust.ion ra Le > [uel-a iT' mi.-..;ing, ell~i ne DeI" f'orrn2lnr;e and f'ormat.ion of polluLant,s of an en~ine are all highly dependent, on t.he 1'10. 1'ield Lhat.. exist.s in t..he en~~ne cvlinder- Lhe compression st..roke where t.here lS no jet, rlo~ exist,s. Result..s show a r.omplicaLcd flo,," f"it!ld durln: t,he inLake sLroke
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
