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The present work investigates the performance and emission characteristics of   pongamia oil and diesel fuelled direct injection compression ignition (DICI)   and homogeneous charge compression ignition (HCCI) engine. The primary   objective of the work is to investigate the feasibility of application of   unmodified pongamia oil in Diesel engine and to estimate the maximum fraction   of diesel fuel replaced by the neat pongamia oil. This investigation also   deals with the HCCI operation using unmodified pongamia oil. In DICI mode the   neat pongamia oil is admitted into the engine in the form of pongamia oil and   diesel blends. The blend that offers highest diesel replacement is considered   as the test blend and it is tested further to find its maximum possible brake   thermal efficiency by changing the engine operating parameters. The selected   maximum blend is then tested in the new setting of the engine to determine   the maximum possible performance and emission characteristics. The   conventional emissions of DICI engine such as NO and smoke are disappeared in   the homogeneous charge compression ignition mode of operation. The HCCI   engine tested in the present work is fuelled by 40% neat pongamia oil and 60%   diesel fuel through direct injection and vapour induction, respectively. The   ignition or combustion phasing of the HCCI operation is carried out by the   exhaust gas recirculation method. The amount of exhaust gas re-circulation   governs the timing of combustion. The results of the experiments show that   the neat pongamia oil performed well in HCCI mode and offered approximately   ten times lower NO and smoke emission. Finally, the results of the DICI mode   and HCCI mode are compared with each other to reveal the truths of neat   pongamia oil in heterogeneous and homogeneous combustion

Performance and emission study on DICI and HCCI engine using raw pongamia oil and diesel