Turbulent burning velocity in combustion chamber of SI engine fueled with compressed biogas

Abstract

Turbulent buiTŨng veloáty is the most important parameter in analyzứìg pre- ưiixed combustion simulation of spark ignỉtion engines. It depends on the laminai biưn- ingveloátyandturbulenceintensity inthecooibustionchainber. TheBrsttenn canbepre- dicted if One knows fuel compositìon, phyãco Chemical properties of the fluid. The second term stTongly depends on the geometry of the combu^on chamber and ũuid movement during the cOTnbustion piocess- One cannot suggest a general eỉ^ressioT) for dì£ferent cases of engine- Thus, for accuracy modeling, one should detennine turbulent buining velodty m the combustion chamber of each case of engine individxially. ửi Ihis study, the tuibulent buming veloáty is deSned by â lĩnear hưiction of lamìnai buming velodty ử\ which the proportional constant is dehned as the tuibnient biưning velodty coeíâdent. This coelQcient was obtained by analyzing the numerical simidation results and experi- menlal data and this is applied to a concrete case of a Honda Wave motorcycle engĩne combiLstion chamber that hieied vvith compreíised biogas. The results showed that the turbulent bumìng velodty coeíhdent in tihis case is around 1.3 when the average engine levolutions is in the range of 3000 ipm to 6000 rpm wilh biogas conlaúúng 80% Methane. We can then pređict the eítects of diííerent parameters on the períonnance of the engine íueled with compressed bìogas by simulatiorL