Experimental Investigation of Gasoline Fumigation in a Turbocharged IDI Diesel Engine

Abstract

In the present study the effects of gasoline fumigation (GF) in a turbocharged indirect injection (IDI) diesel engine have been investigated experimentally. Here an elementary carburetor which main jet opening (MJO) can be adjusted by a fine threaded screw has been installed on the inlet pipe of diesel engine. Thus gasoline at low amounts can be injected in the inlet air ant it evaporates during intake and compression processes. The engine operates at diesel principles and it is thought that instantaneous burning of fumigated gasoline will enhance the combustion and performance of diesel engine. Here the experiments have been performed for 2000, 3000 and 4000 rpm, at different fuel delivery rates (FDR). FDRs have been taken as (29, 33, 50, 67 and 75) % for 2000 rpm, (42, 50, 67, 75 and 83) % for 3000 rpm and (50, 67, 75, 83 and 100) for 4000 rpm. Also, experiments have been performed at 5 and 6 different carburetor MJOs for (2000, 3000) rpm and 4000 rpm respectively. By evaluating of experimental results, it is determined that effective power generally reduces at all of the engine speeds, whereas at some instances it takes values close to the neat diesel fuel (NDF). It is observed that the decrease ratio of effective power increases especially at low fumigation ratios, but it reduces for higher gasoline ratios. On the other hand, it is determined that brake specific fuel consumption (BSFC) reduces and thus effective efficiency increases. Similarly the BSFC reduction and effective efficiency increment take higher values for high gasoline ratios. Finally it has been seen that, BSFC reduces approximately at the levels of 5%. Also NOx concentration decreases approximately at the levels of 10%. Cylinder gas pressure becomes higher than NDF at the beginning of the combustion process, it reduces through to the end of the combustion and it again takes higher values at the end of expansion and during exhaust processes. Here the effect of the GF on the smoke formation has also been investigated. It is determined that, smoke index K reduces for up to (6–8) % GF and it begins to increase after 8% gasoline ratio. Its maximum reduction ratio is 20% and it is obtained at 8% GF for 2500 rpm.

Effects of gasoline fumigation on exhaust emission and performance characteristics of a diesel engine with mechanically‐controlled fuel injection pump

“…Other researchers on ethanol and ethanol fumigation have reported 30 and 50% reductions in smoke emissions, respectively . Sahin et al indicated that 10% gasoline fumigation decrease smoke opacity for about 33% at 3500 rpm.…”

“…Zhang et al [28] indicated the combined use of fumigation methanol and diesel oxidation catalyst leads to a reduction of HC, CO, NO x , particulate mass and particulate number concentrations at medium to high engine loads. Sahin et al [25,29] recommended that gasoline fumigation can be effectively employed in existing diesel engine to improve engine performance and to reduce NO emission. Sahin et al [30] investigated theoretically the effects of light fuel fumigation, such as ethanol and gasoline, on a DI diesel engine performance characteristics and exhaust emissions.…”

Prediction of performance and exhaust emissions of diesel engine fuelled with adulterated diesel: An artificial neural network assisted fuzzy-based topology optimization

“…In cold region, diesel engine starting is a major problem 7 and utilization of kerosene with diesel is a good option in order to overcome such problem as it has superior cold flow characteristics. 7 Adulterated diesel fuel is mainly used in off-road applications in which IDI engines are widely employed [26][27][28][29] and a meagre number of research works have been done on adulteration. Moreover, prediction by ANN model on the performance and exhaust emission characteristics of an IDI engine associated with the adulteration of diesel fuel with kerosene along with fuzzy-based optimization in IDI engine is uncharted.…”

“… where,. MOS = maximum observed value during sampling for the measured pollutant. MIS = minimum observed value during sampling for the measured pollutant. ASU = uncertainty of measurement of the respective pollutant by the analyser. 28–32 …”

Improving of diesel combustion-pollution-fuel economy and performance by gasoline fumigation

“…Thus, EF experiments were performed on turbocharged version of this engine. The EF results for turbocharged engine version were presented in references (Sahin et al 2010, Sahin et al 2015.…”