Abstract:
The investigation was carried out in a two cylinder four stroke cycle diesel
engine (17,65 kW) with a rated speed of 1500 rev/min. The gaseoUs inixture of
alternative fuel (Natural gas) and COl of different compositions were used in the
engine to predict the performance of the engine running with the biogas of same
composition. The proportion of natural gas and COl were varied in the gaseoUs
mixture by two methods. namely: fixed COl percentage method and varied COl
percentage method.
Gaseous mixture of 10 per cent and 20 per cent COl were used to run the
engine at full load and speed (1500 rev/min). These percentages were inaintained
constant throughout the experiment u~ing fixed COl percentage method. Rere-in the
brake specific fuel consumption (Bsfc) of the engihe was examihed. Brake specific
fuel consumption was considered as the ratio of the total fUel flow rate (diesel
flow rate + diesel equIvalent gaseous mixture flow rate) to brake power. Bsfc
increased by 14 per cent from full diesel operation to 56 per cent substitution
of diesel by gaseous mixture of 10 per cent COl' Similar increase in Bsfc was found.
in case of 51 per cent substitution of diesel by gaseous mixture of 20 percent COl
where it increased by 20 per cent from full diesel operation .
