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The use of WDEF (water-diesel-emulsified fuel) has been one of the effective methods used for NO x  (Nitrogen oxide) reduction without any modification on engine. In the present study, firstly, the potential of emulsified fuel on performance of engine parameters has been determined. In the experiments; pure diesel, 5%, 10% and 15% water content have been prepared and tested at rated power and torque conditions. As a result of experiments, a slight reduction of up to 5.22% in brake power is observed for maximum torque, also increase up to 7.42% in BSFC (Brake-specific fuel consumption) is attained while using emulsified fuel. However, a leading emission problem of diesel engine, the highest reduction in NO x  emissions is obtained as 16.84%. For maximum power, a slight reduction up to 5.46% in brake power has been observed, also increase up to 8.96% in BSFC is acquired comparing with pure diesel. The highest decrease in NO x  emissions has been achieved 10.8% by using WDEF. As a result of theoretical study, 10% emulsified fuel has been determined as the optimum fuel blend with the use of Fuzzy-AHP (Analytic hierarchy process) and CODAS (Combinative distance-based assessment) regarding experimental results of brake power, torque, brake specific fuel consumption and NO x  emissions. The effects of the optimized fuel on performance of engine parameters and NO x  emissions have been examined by one dimensional thermodynamic simulation, AVL Boost, and the results are compared with experimental data. The theoretical results have a good agreement with experimental data.

NO X based comparative analysis of a CI engine fueled with water in diesel emulsion