Heat Release Rate, Performance and Vibration Analysis of Diesel Engine Operating with Biodiesel -Triacetin Additive Blend Fuels

The diesel fuel experiments were conducted on diesel engine, with coconut oil methyl ester (COME)-Triacet in additive blends as alternative fuels. Reduction of CO 2, CO, HC, NO, and smoke emissions were achieved succes sfully with 10% Triacetin and 90% COME blend fuel. Three directio ns of engine cylinder and on the foundation were mea sured and analyzed for Vibration of engine, to elicit informat ion about the nature of combustion in the cylinder. The pressure signatures were tallied with the time wa ves, eliminating the time lag in between exciter and vibration of cylinder head. Triacetin, being an antiknock fuel wi th 10% blend, emanated as the best blend fuel with i ts contribution to reduce cylinder vibration in the vertical direction . Time wave resemblance with pure harmonics indicates smooth combustion with lesser engine detonation. By analyzin g the measured in-cylinder pressure data and releas ed heat rate, it is observed that the addition of Triacetin increase s the ignition delay and the amount of heat release in the premixed combustion duration, but shortens both the diffusiv e burning duration and the total combustion duratio n.