Abstract
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.
Highlights
Among the internal combustion engines, compression ignition (CI) engines are widely used
Peak pressure The in cylinder pressure and its variation along the engine combustion process is a matter of greater importance to really understand the nature of the engine
It was noticed that the pressure is declined when compared to the baseline diesel engine in the same way at regular intervals even gradually at a rate of 4% to 3% at 110 g/h and 180 g/h of charge flow into the chamber respectively and brought the diesel efficiency at 240 g/h of charge flow
Summary
Among the internal combustion engines, compression ignition (CI) engines are widely used. In the search of alternative fuels for diesel engines many fuels were experimented and successfully replaced, but at the sake of performance and emissions. Emergent industrialization, limited reserves of fossil fuels and alarming environmental pollution necessitated to search for some more alternatives of conventional fuels. This resulted in fuels like CNG, LPG, Acetylene, ethanol, methanol, biodiesel, some vegetable oils and other such biomass resources. Good quality fuel should fulfill environmental and energy needs without compromising the performance of the engine Acetylene has many such qualities to be a good fuel among other alternative fuels because of its calorific value and combustion efficiency. We have worked out a system with which the acetylene can be used as an automobile fuel with better performance on par with Diesel engine
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