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The effects of methanol and oleic acid blended diesel fuel on the performance and emissions of the diesel engine are evaluated numerically by commercial software Diesel-RK to simulate a single cylinder, naturally aspirated, direct injection, four-stroke diesel engine. The present study also resolves the problem of the immiscibility of methanol in diesel fuel, as to avoid immiscible nature an optimum percentage of oleic acid and n-butanol is added to make blends stable. The methanol blended diesel fuels are 7%, 12%, and 17% methanol in volume basis (D85M7NB1O7, D75M12NB1O12, and D65M17NB1O17). A drastic reduction in NOx emission is observed due to low combustion temperature however the PM emissions increases which can be controlled by using exhaust after-treatment techniques. The results indicate that: the brake specific fuel consumption increases and brake thermal efficiency decreases with an increase of methanol, oleic acid and n-butanol contents in the blended fuel whereas maximum heat release rate increases and exhaust temperature decreases.

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Due to upcoming Bharat Stage-VI emission norms, emission control has to become mandatory for every vehicle in India. Bharat Stage-VI are the stringent emission norms to be introduced by the Indian government for controlling the vehicle exhaust emissions. Diesel powered vehicles are more popular because of its high thermal efficiency, lower fuel consumption, and lower CO2 emission compared to the petrol engine. Although, diesel-powered vehicles produce more oxides of nitrogen and particulate matter. Diesel particulate filter (DPF) is the new technology to abate the particulate matter. In this paper, a DPF was installed into the exhaust of a single cylinder direct injection diesel engine. In order to investigate the filtration efficiency of DPF and its effect on fuel economy, indicated power and emission characteristics, experiments were conducted on a single cylinder diesel engine test rig. Results showed that after installing the DPF on the engine exhaust there was more than 90% reduction in particulate matter, while specific fuel consumption was increased by about 4% and indicated power was decreased by approximate 2KW.

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