Abstract
In the current experimentation, combustion assessment was performed in a 4-stroke compression ignition dual-fuel engine using a blend of Karanja biodiesel (10% by volume with diesel) with variation in engine loading. Producer gas (PG) is used in the dual-fuel engine along with diethyl ether (DEE) as a cetane enhancer to improve the combustion trend of dual-fuel operation. The combustion characteristics of a dual-fuel run indicate that the apex point of net heat release rate and cylinder pressure curve moved marginally away from the top dead centre. The highest peak cylinder pressure was recorded for Diesel-5DEE-PG (6.68 MPa) at 15° after top dead centre (aTDC) compared to 6.11 MPa at 9° after TDC for the base result (diesel alone run). Highest peak value of net heat release rate was observed for diesel alone run 53.23 J deg−1 at 1° aTDC followed by Diesel + PG (50.27 J deg−1 at 8° aTDC), Diesel + 5DEE + PG (49.75 J deg−1 at 6° aTDC), B10 + 5DEE + PG (49.36 J deg−1 at 8° aTDC), B10 + PG (48.03 J deg−1 at 8° aTDC). The slope of the left limb of mean combustion temperature slightly fell throughout the dual fuel run indicating the delayed combustion process with PG induction. The inclusion of DEE as a cetane enhancer with pilot fuels have improved the combustion trend during dual fuel run.
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