Assessment of combustion performance and emission characteristics of biodiesel with natural additive in a low heat rejection engine

Abstract

Compression-Ignition (CI) engines are employed in automobiles newlinedue to their higher pulling strength, reliability, and lower fuel usage than newlineSpark Ignition (SI) engines. Petroleum-based oils are used in both CI and SI newlineengines, resulting in environmental pollution such as acid rain, ozone newlinedepletion, and climate change. Because of demographic increase and the newlinedevelopment of manufacturing industries, petroleum-based fuel consumption newlineis rising day by day. This forces scientists to substitute diesel fuel for CI newlineengines, to meet the current fuel demand. newlineBiodiesel is the available fuel to meet demand in all aspects and has newlinethe almost same properties of diesel. The biodiesel-operated CI engines newlineproduce lower hydrocarbom (HC), carbon monoxide (CO), and smoke than newlineconventional diesel engines. The poor performance and higher Oxides of newlinenitrogen (NOx) emission makes restriction of biodiesel usage in the CI engine. newlineThe conversion of CI into low heat rejection (LHR) engine and minimum newlineamount of natural antioxidant additive with biodiesel will remove these newlineproblems. newlineLHR engine, with a combustion chamber insulated by Partially newlineStabilized Zirconia (PSZ) as primary coating and Nickel-chromiumaluminum- newlineyttrium (NiCrAlY) as bond coat will improve efficiency. Engine newlinecylinder head, liner, piston, inlet, and exhaust valves, are coated with PSZ and newlinebond coat using NiCrAlY through plasma spray method. The tests are carried newlinein a four-stroke single-cylinder CI engine, and the compression ratio of 17.5:1 newlineis maintained throughout the experiments. newline