Abstract
The combustion performance of a conventional rail diesel engine was investigated by measuring the exhaust gas with the respect to the number of injector holes, fuel type, and the use of exhaust gas recirculation (EGR), to provide a detailed reduction of environmental pollutants. It was found that a six- or seven-hole injector was more effective than a five-hole injector for reducing the exhaust gas. In addition, the mixing of 20% biodiesel oil with diesel most effectively reduced the HC and NOx contents. The technology generally reduced the NOx and CO contents of the exhaust, but had no significant effect on the HC and CO2 contents.
Highlights
The conventional diesel engine, which was invented by Rudolf Christian Karl Diesel in 1897 [1], used oil or heavy oil as its fuel
Common rail diesel engine considered in this study included a fuel tank, low-pressure pump, control common rail diesel engine considered in this study included a fuel tank, low‐pressure pump, fuel filter, high-pressure pump, fuel pressure regulator, pressure sensor, injector, electronic control unit, fuel high‐pressure pump, pressure pressureofsensor, injector, electronic control andfilter, sensors and actuators
HC concentrations in the exhaust were 117.7, 42.4 and 35.4 ppm for the five, six, and seven-hole injectors, respectively. This indicated reductions of 63.4% and 69.8% when the number of injector holes was increased to six and seven, compared to the use of five holes. These results show that the HC emission is significantly reduced by using six and seven injector holes, compared to using five holes
Summary
The conventional diesel engine, which was invented by Rudolf Christian Karl Diesel in 1897 [1], used oil or heavy oil as its fuel. Dong et al [8] conducted a study on the effect of ethanol/diesel dual fuel operation on combustion and exhaust gas depending on the number of nozzle holes. Concerning previous studies on the application of biodiesel fuel, Kim et al [10] experimented to determine the spray characteristics of a common high-pressure rail fuel-injection engine, by measuring temperature and pressure at the front and rear of the filter, the spray angle, and the spray travel distance compared to that of pure diesel. Jaliiantabar et al [24] investigated the effects of pilot injection timing and the EGR system as a general method of reducing engine emissions in consideration of engine combustion, emissions, and performance while various types of biodiesel used. EGR were concerning the present study, theofcomponents exhaust when gas produced usinginvestigated an EGR were investigated number of injector holes, the biodiesel oil ratio, and the rpm of the engine.
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