Faculty Publications

Permanent URI for this communityhttps://idr.nitk.ac.in/handle/123456789/18736

Publications by NITK Faculty

Browse

Author: search.filters.author.Mohanan, P.Subject: search.filters.subject.Combustion

Search Results

Now showing 1 - 5 of 5
  • No Thumbnail Available
    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.
  • No Thumbnail Available
    Item
    Effect of oxygen enrichment on the performance, combustion, and emission of single cylinder stationary CI engine fueled with cardanol diesel blends
    (Korean Society of Mechanical Engineers, 2014) Dinesha, P.; Nayak, V.; Mohanan, P.
    We investigated the effect of intake air enrichment on the performance, combustion, and emission characteristics of a single cylinder direct-injection stationary diesel engine fueled with non- edible alternative fuel, namely, cardanol - diesel - methanol blend (B20M10). The results were compared with baseline diesel operations under standard operating conditions. The bio-fuel blend B20M10 (20% cardanol, 10% Methanol, and 70% diesel) was used as fuel and the combustion, performance, and emission characteristics were investigated by oxygen enriching of intake air with 3, 5, and 7 percentage by weight. With the increase of intake air oxygen concentration, CO, HC, and smoke were found to be decreased. But BTE and NOx emission were considerably increased. The blended fuel B20M10 with 7% oxygen enrichment of intake air was compared with diesel operation. The results show a 0.5% lesser BTE, 28% more NOx emission at full load condition. There is not much variation of smoke emission to be noticed for this fuel combination compared to diesel. © 2014 The Korean Society of Mechanical Engineers and Springer-Verlag Berlin Heidelberg.
  • No Thumbnail Available
    Item
    A study of the effect of injection pressure on the combustion, performance, and emission characteristics of cardanol biofuel blend fuelled compression ignition engine
    (John Wiley and Sons Ltd Southern Gate Chichester, West Sussex PO19 8SQ, 2015) Dinesha, P.; Mohanan, P.
    The use of biodiesel along with other alternative fuel sources is expected to address the twin problems of pollution and energy security. This study investigates the effect of injection pressure (IP) on the performance, combustion, and emission characteristics of a four-stroke single cylinder direct injection diesel engine fuelled with a biofuel, namely cardanol-methanol-diesel blend (B20M10). The results are compared with baseline diesel operations under standard operating conditions. The biofuel blend B20M10 (20% cardanol, 10% methanol, and 70% diesel) is used as fuel, and the combustion, performance, and emission characteristics are investigated at IP levels of 180, 200, and 220 bar. The test results show that the optimum fuel IP is 220 bar with B20M10. At this optimized pressure, a reduction in CO, HC, and smoke emissions with an increase in the oxides of nitrogen (NOx) and brake thermal efficiency (BTE) are noticed compared with 180 and 200 bar B20M10 operations. When compared with diesel (180 bar IP), B20M10 blend at 220 bar IP gives marginally lower BTE and lower CO and HC emissions, but oxides of nitrogen and smoke are slightly more. © 2014 Curtin University of Technology and John Wiley & Sons, Ltd.
  • No Thumbnail Available
    Item
    Evaluation of combustion, performance and emissions of a diesel engine fueled with bio-fuel produced from cashew nut shell liquid
    (Taylor and Francis Ltd. michael.wagreich@univie.ac.at, 2015) Dinesha, P.; Mohanan, P.
    Presently, energy security and food security are two major problems of developing countries. The use of edible oils as an alternative fuel for internal combustion may lead to a food crisis. The non-edible plant-based alternative fuel not only results in energy security but also helps to keep the environment free from pollution. In this experimental investigation, a non-edible plant-based bio-fuel cardanol produced from cashew nut shell liquid (CNSL) is used to study the combustion, performance and emissions of a single-cylinder diesel engine. The test conditions of the engine are 200 bar injection pressure and 27.5 degree bTDC injection timing. The bio-fuel blends B10M10 (10% cardanol + 80% diesel + 10% methanol), B20M10, and B30M10 (30% cardanol + 60% diesel + 10% methanol) were tested at 25%, 50%, 75%, and full load conditions. The results were compared with baseline diesel operation. From the experimental work, it was observed that the brake thermal efficiency of B10M10 and B20M10 (20% cardanol + 70% diesel + 10% methanol) is comparatively similar to that of diesel. The lower emissions of CO, hydrocarbon, and smoke are encouraging to recognize B20M10 as an optimized fuel blend for a compression ignition engine at 200 bar injection pressure and 27.5 degree bTDC. The significant factors of cardanol bio-fuel include its low cost, non-edible, abundance, and it is a by-product of the cashew nut industries. © © 2015 Taylor & Francis.
  • No Thumbnail Available
    Item
    Cycle by cycle variations of LPG-gasoline dual fuel on a multi-cylinder MPFI gasoline engine
    (Taylor and Francis Ltd. michael.wagreich@univie.ac.at, 2018) Vighnesha, N.; Shankar, K.S.; Dinesha, P.; Mohanan, P.
    Combustion stability of a multipoint port fuel injection spark ignition engine working on liquefied petroleum gas (LPG)-gasoline dual fuel mode of operation was analysed. LPG-gasoline ratio was varied from 0 to 100% by controlling the injector signals at wide open throttle condition and 3000 RPM. Increasing LPG ratio will give higher peak pressure and higher indicated mean effective pressure (IMEP) because of the higher flame propagation speed of LPG. The experiment showed that maximum pressure will occur nearer to top dead centre when compared to gasoline. Fluctuation in maximum pressure is higher for LPG and is minimum for 50% LPG. Time return map showed that combustion instabilibity will be more for 100% LPG and is less for 50% LPG. Coefficient of variation of IMEP and maximum pressure for gasoline is higher than LPG. With 100% LPG, NOx emission is almost three times that of gasoline. Hence it can be concluded that 50% LPG will give the better combustion characteristics when compared to other fuel blends. © 2017, © 2017 Informa UK Limited, trading as Taylor & Francis Group.