High-viscous neat neem oil (NO) with low-viscous wintergreen oil (WGO) may be used in diesel engines without any engine modification. Based on the previous experimental results, equal-volume blending of NO and WGO was prepared based on the optimum performance. The main aim of this experimental research is to improve the performance of NO-WGO blend using lower- and higher-order alcohol in terms of performance, emission and combustion parameters of the engine. All the experiments were conducted in a single-cylinder CI engine producing 5.2 kW power at a constant speed of 1500 rpm at variable loads. This research aims to compare the outcome of injection and blending of alcohol with NO and WGO blend at various load conditions. Alcohols, namely methanol, ethanol, hexanol and octanol, were identified and were injected in the inlet manifold along with intake air and also blended with the test fuels volumetrically. Based on the previous experimental results conducted with various injection rates of all the alcohols with NO50-WGO50, the optimum injection rate of each alcohol was identified on a mass basis based on the engine performance. Methanol, ethanol, hexanol and octanol blend and injection ratio was fixed at 30%, 30%, 20% and 10% on a mass basis. According to engine combustion, performance and emissions results, the injection of hexanol and octanol had the result of improving brake thermal efficiency, brake specific energy consumption and exhaust gas temperatures compared to other blends. The maximum pressure and heat release rate for all the hexanol and octanol alcohol injection blends were higher at higher loads. The HC, CO and smoke emissions were lower with Hex20 and Oct10 with NO50-WGO50 blends injection. The decrease in emissions is a result of homogeneous mixture formation within preinjected alcohols as well as air and lower volume of base fuel injected within the mixture. Finally, the NOx emissions increased with alcohol injection in comparison with blending with tested fuels.
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