Conference Papers
Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/28506
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Item Effect of Hydrogen Addition on Combustion and Emission Characteristics of High Speed Spark Ignition Engine- An Experimental Study(SAE International, 2015) Shivaprasad, K.V.; Chitragar, P.R.; Kumar, G.N.This article experimentally characterizes the combustion and emission parameters of a single cylinder high speed SI engine operating with different concentrations of hydrogen with gasoline fuel. For this purpose, the conventional carbureted high speed SI engine was modified into an electronically controllable engine, wherein ECU was used to control the injection timings and durations of gasoline. The experiments have been conducted for different engine speeds at various throttle positions. The experimental results demonstrated that engine brake power and brake thermal efficiency increased to certain extent and then decreases with the increase of hydrogen percentage in the fuel blend. The experimental results revealed that heat release and cylinder pressure increased with addition of hydrogen fraction till 20%. It also showed the reduction in HC and CO emissions in comparison with pure gasoline. The main drawback detected was higher NOx emissions due to the high combustion temperature. © © 2015 SAE International.Item Combustion Characteristics and Cyclic Variation of a LPG Fuelled MPFI Four Cylinder Gasoline Engine(Elsevier Ltd, 2016) Nayak, V.; Rashmi, G.S.; Chitragar, P.R.; Mohanan, P.Present study deals with to investigate the effect of dual mode of operation on combustion characteristics of engine and cyclic variation in a modified multi-cylinder SI engine. Experiments will be conducted with baseline gasoline and later with dual fuel mode of experiments i.e., gasoline with LPG with different ratios (25%, 50%, 75% and 100% of LPG by mass). Experiment will be carried out with varying speed from 2000 rpm to 4500 rpm in steps of 500 rpm at full load condition with factory set static ignition timing of 5 deg. bTDC to investigate combustion characteristics and cyclic variations. Results revealed that as the LPG percentage increases the peak pressure also increases and it is maximum for 100% LPG for all the speed. At 4500 rpm the percentage increase in peak pressure is 20% for 100% LPG, 9% for 25%LPG, 3% for 50%LPG, 1% for 75%LPG when compared to gasoline at full load. This increase in peak pressure will indicate the LPG will give better combustion properties compared to that of gasoline. Compared to peak pressure, the variation in cycle to cycle for IMEP is less.Net heart release rate shows that gasoline will give the more heat release compare to all other fuels, but LPG will release the heat little earlier than gasoline. Since peak pressure is near to TDC for LPG which results in NHRR to occur earlier than gasoline. Final outcome of the research is LPG will have better combustion properties compared to gasoline but cyclic fluctuations are more for LPG. © 2016 The Authors.Item An Experimental Study on Combustion and Emission Analysis of Four Cylinder 4-Stroke Gasoline Engine Using Pure Hydrogen and LPG at Idle Condition(Elsevier Ltd, 2016) Chitragar, P.R.; Shivaprasad, K.V.; Nayak, V.; Bedar, P.; Kumar, G.N.Fluctuation in oil prices and stricter exhaust emission norms were the main reasons wakening every researcher to search for suitable and feasible alternative fuels for automotive use. Among the available option gaseous fuels find their best position because of their compatible physical-chemical properties and ecofriendly nature than present fossil fuels. Hydrogen's combustion properties like high energy content, high heating value, wide range of flammability and low ignition energy with almost least toxic emissions are favorable to use in an IC engine as an alternative fuel. Liquid petroleum gas (LPG) has lower carbon content, higher calorific value, octane number and flame propagation speed will improve the emission results compared to gasoline fuel. This paper describes an experimental results carried out to evaluate the combustion and emission performance of a Maruti Suzuki make, spark ignited four cylinders, four stroke engines at idle condition by using pure hydrogen, LPG and gasoline. The engine was adjoined with Electronic Control Unit (ECU) assisting hydrogen and LPG injector system keeping gasoline line unchanged. Tests were carried out by using compressed hydrogen gas regulated by two stage pressure reduction from cylinder to atmospheric value and by using vaporizer pressure for LPG. For comparison engine was run first by gasoline and then by pure hydrogen and LPG. Study revealed that there was increment of 13% cylinder pressure for pure hydrogen and decrement of 4.5% cylinder pressure for LPG when compared to gasoline. The burn duration for pure hydrogen, LPG and gasoline were found to be increasing respectively which infers that hydrogen has very short combustion duration and gasoline higher. It was observed that toxic emissions like Carbon monoxide (CO), Hydrocarbons (HC) and Oxides of Nitrogen (NOx) were improved for pure hydrogen than LPG and gasoline. © 2016 The Authors.Item Investigation on performance, combustion and emission characteristics of 4-stroke four cylinder hydrogen fuelled SI engine(American Institute of Physics Inc., 2021) Chitragar, P.R.; Shivaprasad, K.V.; Gaikwad, M.S.; Kumar, G.N.In respect of depletion of fossil fuel and its harmful effect on the environment, research on alternative fuel engines has fascinated large attention from the engine society. Among the several options considered today, hydrogen conceivably the ideal fuel in view of its immeasurable clean-burning qualities, source availabilities and thus promises to be the greatest potential fuel. This article explores the investigation on combustion, performance and emission characteristics of four-cylinder, four-stroke spark ignition (SI) engine experimentally. Tests were carried out by using pure gasoline and pure hydrogen by different loads and speeds at static ignition timing of 5-degree crank angle before top dead center (deg. CA bTDC). The experimental study discovered the decrement in brake power along with volumetric efficiency and increment in brake thermal efficiency with hydrogen fuel engine operation compared to gasoline operation. In-cylinder pressure is notably increased with hydrogen and peak pressure was shifted towards TDC in comparison with gasoline engine operation. The net heat release rate is enhanced with neat hydrogen engine operation compared to gasoline. The emissions of carbon monoxide (CO), hydrocarbons (HC) were condensed and a nitrogen oxide (NOx) was amplified for hydrogen compared to gasoline engine operation. © 2021 Author(s).