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People have been working seriously in the search for best alternative fuels to safeguard the environment ever since the transportation and industrial fields started growing widely. Among such alternatives acetylene has proved to be a better fuel for internal combustion engines due to its low cost, simplicity in manufacturing and excellent combustion characteristics. Moreover it has less carbon content compared to other fuels, which plays a central role in environmental degradation. However the fuel must be safe and environmentally friendly and also readily usable in existing engines without any significant design modifications. Acetylene is produced in parallel to the engine operation taking proper care to avoid back firing. We propose in the present study that acetylene be the safe and appropriate fuel for a compression ignition engine. Diesel engine is selected with a subsidiary mixing box for a homogeneous mixture of air and acetylene. The experiments are conducted with fixed acetylene flow rates from 0.1Lit/min to 5Lit/min with an increase of 0.5Lit/min in every step. The engine is tested at various loads, keeping track of combustion performance to find out the optimum fuel flow rates and also to have reduced emissions. The results show that the performance of the Acetylene enriched engine is nearer to the pure diesel engine with reduced emissions. It is concluded that acetylene could be the better alternative fuel without compromising brake thermal efficiency and safe operation with a moderate increment of smoke and NOx.

The exponential growth in demand for energy and the non-availability of fossil energy and the immediate concern about environmental problems have intensified alternative fuels researchers' work. Aleurites Fordii (AF) biodiesel is a biomass-derived biofuel that can sequester carbon dioxide and release environmentally balancing O2 and is thought to blend in 5-15% range with conventional petro-diesel fuel. Further, these blends were tested with 5% and 10% of total energy with GH2 in a 4-stroke, 10 kW, water cooled, naturally aspirated, constant speed, in-direct injection compression ignition engine performance enhancement and reduction in emissions. All safety-related issues in handling and storage of GH2 were considered as per National Fire Protection Association recommended standards. 5% AF biodiesel blend with 5% GH2 (AFBD5H5) shown better performance with minimum emissions except NOx was identified and compared with 90C pre-heated AF Straight Vegetable Oil (AFSVO), pure AF biodiesel (AFBD), 5% hydrogen supplemented AF Biodiesel (AFBD5H) and conventional petro-diesel operations.

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