Methods for in-cylinder EGR stratification and its effects on combustion and emission characteristics in a diesel engine

Effects of EGR rate on performance and emissions of a diesel power generator fueled by B7

“…Figure 10 shows that NO X -specific emissions are reduced with increasing EGR rate for all engine load range investigated. This behaviour is justified by the reduction of oxygen availability due to the displacement of some of the oxygen in the fresh intake air charge by the recirculated exhaust gas [30,[43][44][45][46][47][48]. This causes a reduction in the local flame temperature because of the spatial broadening of the flame due to the reduction in the oxygen molar fraction [24].…”

Development and validation of double and single Wiebe function for multi-injection mode Diesel engine combustion modelling for hardware-in-the-loop applications

“…inside the cylinder. Despite their accuracy, these models with high CPU time are inadequate for real time simulations and are usually used for parts definition: combustion chamber form [14], in-cylinder charge distribution [2][3][4]15] fuel jet-air interaction [16]. In fact, reduced modelling approaches with low computational efforts are very useful for real time simulations.…”

Numerical Investigation on Effects of Assigned EGR Stratification on a Heavy Duty Diesel Engine with Two-Stage Fuel Injection

“…However, it causes high in-cylinder temperature and less fresh charge due to hot EGR [28]. Therefore, EGR stratification is more inclined to be organized by supplying external EGR asymmetrically to intake ports [29]. In this way, a radial stratification of EGR forms in the piston cavity [30] and can be maintained until late timings corresponding to the combustion event [31], and obvious reduction of NO x and soot emissions have been obtained.…”