M. Udayakumar

Investigations on emission characteristics of the pongamia biodiesel–diesel blend fuelled twin cylinder compression ignition direct injection engine using exhaust gas recirculation methodology and dimethyl carbonate as additive

Experiments were carried out on a twin cylinder direct injection compression ignition engine using pongamia biodiesel–diesel blend as fuel with exhaust gas recirculation (EGR) and dimethyl carbonate (DMC) as additive. The experimental results showed that pongamia biodiesel–diesel blend fuelled engine with EGR and DMC can simultaneously reduce smoke and nitric oxide (NOx) emission. The NOx emission was reduced by about 17.68% for 10% of EGR introduction and about 13.55% increase in smoke emission. When dimethyl carbonate was added with EGR, the engine emits lower smoke with lesser NOx emission, and it showed that the smoke reduction rate had a linear relationship with DMC percentage. The carbon monoxide (CO) and hydrocarbon (HC) emissions also decreased when DMC was added. However, the addition of DMC with EGR caused an increase in both BSEC and BTE.

An experimental investigation on the performance and emission characteristics of a twin cylinder DI compression ignition engine employing bio-diesel blend as fuel at different injection timings and injection pressures

In this study, the combined effect of injection timing and injection pressure on the performance, emission characteristics of a twin cylinder CIDI engine employing biodiesel blend of B40 as fuel was evaluated. The vegetable oil is extracted from the pongamia seeds which further underwent the transesterification process to get converted into biodiesel. The experiments were carried out at different injection timings of 18, 21, 24, 27 and 30° BTDC and at the injection pressures of 150, 175, 200, 225 and 250 bar. The best performance and lower CO, HC and smoke emissions were obtained at 225 bar and at 30° BTDC but NO x emission was higher. Considering lower NO x emission and better performance, the 225 bar of injection pressure and 21° BTDC of injection timing can be set as the optimum value for the specified twin cylinder diesel engine.