Sridhar G - Academia.edu (original) (raw)
Papers by Sridhar G
cgpl.iisc.ernet.in
This paper reviews the use of biomass for power generation using IC engines or fuel cells. The di... more This paper reviews the use of biomass for power generation using IC engines or fuel cells. The different types of biomass and common features among them are examined. Their use in power generation is reviewed and gasification has been identified as a ...
Bamboo is a fast growing fibrous plant grown in abundance in India. As a consequence to bamboo fl... more Bamboo is a fast growing fibrous plant grown in abundance in India. As a consequence to bamboo flowering, it becomes imperative to find additional ways and means of using bamboo within a short span of time. If not put to immediate use the one other way is to extend the shelf life of the bamboo. The current practices of bamboo usage can only consume a part of the excess bamboo generated thereby opening possibility for other usages. Torrefaction of bamboo is seen as one such possibility that apart from energy densification makes the product resistant to fungal attack. Under one of funded project, torrefaction of bamboo has been successfully attempted on a kiln of 1 ton/day input capacity. Prior to conceiving the design of the kiln, basic studies have been conducted between 180 and 350 °C temperature. Furthermore torrefied bamboo has been characterized for calorific value and elemental balance. Based on the analysis it is found that there is an enhancement in energy density by 20% agai...
Fuel Processing Technology, 2014
ABSTRACT
1 . India an oil -importing country, with nearly 70% of its population living in half million vil... more 1 . India an oil -importing country, with nearly 70% of its population living in half million villages and hamlets across the country and rich in bio -resources is ideally suited for biomass-based technologies. The Ministry of Non - conventional Energy Sources (MNES) has taken the initi- ative to develop research groups within India for techno - logy and manpower
Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 2006
A zero-dimensional modelling study has been conducted using wrinkled flame theory for flame propa... more A zero-dimensional modelling study has been conducted using wrinkled flame theory for flame propagation to understand the in-cylinder pressure behaviour with time in a reciprocating internal combustion engine. These are compared with experiments conducted on the engine operated on biomass derived from producer gas and air mixture. The required inputs on the laminar burning velocity and turbulence parameters are obtained from separate studies. The data related to laminar burning velocity for producer gas and air mixture at thermodynamic conditions typical of unburned mixture in an engine cylinder were obtained from one-dimensional flame calculations. The turbulence parameters were obtained by conducting a three-dimensional computational fluid dynamics study on a bowl-in-piston geometry to simulate motored or non-firing conditions. The above mentioned data were used in the zero-dimensional model to make pressure-time (p-θ) computation over the complete engine cycle, for a range of tes...
Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 2005
This paper discusses computational results concerning the laminar burning velocity of a biomass-d... more This paper discusses computational results concerning the laminar burning velocity of a biomass-derived producer gas and air mixture at pressures and temperatures typical of the unburned mixture in a reciprocating engine. The computations are based on solving conservation equations describing laminar one-dimensional, multicomponent, chemically reacting, and ideal gas mixtures that have been formulated by earlier researchers. Based on a number of calculations at varying initial pressures and temperatures, and equivalence ratios, an expression for estimating the laminar burning velocity with the recycled gas mass fraction has been obtained. Also, the effect of varying amounts of recycled gas on the burning velocity has been determined. These data on laminar burning velocities will be useful in predicting the burnrate in a spark ignition (SI) engine fuelled with a producer gas and air mixture.
Energy for Sustainable Development, 1996
… http://cgpl. iisc. ernet. in/site …, 2006
15th European …, 2007
ABSTRACT: Gas turbine operations with liquid and gaseous fossil fuels are an established route fo... more ABSTRACT: Gas turbine operations with liquid and gaseous fossil fuels are an established route for power generation. Use of low calorific value fuel like producer gas in gas turbine is not well established and currently there are no Gas turbines designed for this fuel. This ...
Proceedings of 15th …, 2007
Biomass and Bioenergy, 2003
Biomass and Bioenergy, 2001
A 20 kW reciprocating engine is operated using producer gas derived from a modern open top downdr... more A 20 kW reciprocating engine is operated using producer gas derived from a modern open top downdraft re-burn biomass gasifier that has been evaluated by rigorous laboratory performance testing over several hundred hours. The engine is operated at varying compression ratio (CR) from 11.5 to 17.0 and ignition timings from 30 to 6° before Top Centre (TC). The engine – alternator system is characterised for its performance by the simultaneous measurement of gas and airflow rates, gas composition (on-line), emission levels and power delivered. It is also instrumented to obtain the in-cylinder behaviour in the form of pressure-crank angle (p – θ) diagram to assess the thermodynamic behaviour of the engine. Three-dimensional (3-D) simulation of the flow field in the combustion chamber (involving piston-bowl arrangement) through the cycle up to the start of the combustion is used to obtain inputs on the turbulence intensity (u′) and length scale (l T ) for the modelling of the flame propaga...
Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 2004
cgpl.iisc.ernet.in
This paper reviews the use of biomass for power generation using IC engines or fuel cells. The di... more This paper reviews the use of biomass for power generation using IC engines or fuel cells. The different types of biomass and common features among them are examined. Their use in power generation is reviewed and gasification has been identified as a ...
Bamboo is a fast growing fibrous plant grown in abundance in India. As a consequence to bamboo fl... more Bamboo is a fast growing fibrous plant grown in abundance in India. As a consequence to bamboo flowering, it becomes imperative to find additional ways and means of using bamboo within a short span of time. If not put to immediate use the one other way is to extend the shelf life of the bamboo. The current practices of bamboo usage can only consume a part of the excess bamboo generated thereby opening possibility for other usages. Torrefaction of bamboo is seen as one such possibility that apart from energy densification makes the product resistant to fungal attack. Under one of funded project, torrefaction of bamboo has been successfully attempted on a kiln of 1 ton/day input capacity. Prior to conceiving the design of the kiln, basic studies have been conducted between 180 and 350 °C temperature. Furthermore torrefied bamboo has been characterized for calorific value and elemental balance. Based on the analysis it is found that there is an enhancement in energy density by 20% agai...
Fuel Processing Technology, 2014
ABSTRACT
1 . India an oil -importing country, with nearly 70% of its population living in half million vil... more 1 . India an oil -importing country, with nearly 70% of its population living in half million villages and hamlets across the country and rich in bio -resources is ideally suited for biomass-based technologies. The Ministry of Non - conventional Energy Sources (MNES) has taken the initi- ative to develop research groups within India for techno - logy and manpower
Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 2006
A zero-dimensional modelling study has been conducted using wrinkled flame theory for flame propa... more A zero-dimensional modelling study has been conducted using wrinkled flame theory for flame propagation to understand the in-cylinder pressure behaviour with time in a reciprocating internal combustion engine. These are compared with experiments conducted on the engine operated on biomass derived from producer gas and air mixture. The required inputs on the laminar burning velocity and turbulence parameters are obtained from separate studies. The data related to laminar burning velocity for producer gas and air mixture at thermodynamic conditions typical of unburned mixture in an engine cylinder were obtained from one-dimensional flame calculations. The turbulence parameters were obtained by conducting a three-dimensional computational fluid dynamics study on a bowl-in-piston geometry to simulate motored or non-firing conditions. The above mentioned data were used in the zero-dimensional model to make pressure-time (p-θ) computation over the complete engine cycle, for a range of tes...
Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 2005
This paper discusses computational results concerning the laminar burning velocity of a biomass-d... more This paper discusses computational results concerning the laminar burning velocity of a biomass-derived producer gas and air mixture at pressures and temperatures typical of the unburned mixture in a reciprocating engine. The computations are based on solving conservation equations describing laminar one-dimensional, multicomponent, chemically reacting, and ideal gas mixtures that have been formulated by earlier researchers. Based on a number of calculations at varying initial pressures and temperatures, and equivalence ratios, an expression for estimating the laminar burning velocity with the recycled gas mass fraction has been obtained. Also, the effect of varying amounts of recycled gas on the burning velocity has been determined. These data on laminar burning velocities will be useful in predicting the burnrate in a spark ignition (SI) engine fuelled with a producer gas and air mixture.
Energy for Sustainable Development, 1996
… http://cgpl. iisc. ernet. in/site …, 2006
15th European …, 2007
ABSTRACT: Gas turbine operations with liquid and gaseous fossil fuels are an established route fo... more ABSTRACT: Gas turbine operations with liquid and gaseous fossil fuels are an established route for power generation. Use of low calorific value fuel like producer gas in gas turbine is not well established and currently there are no Gas turbines designed for this fuel. This ...
Proceedings of 15th …, 2007
Biomass and Bioenergy, 2003
Biomass and Bioenergy, 2001
A 20 kW reciprocating engine is operated using producer gas derived from a modern open top downdr... more A 20 kW reciprocating engine is operated using producer gas derived from a modern open top downdraft re-burn biomass gasifier that has been evaluated by rigorous laboratory performance testing over several hundred hours. The engine is operated at varying compression ratio (CR) from 11.5 to 17.0 and ignition timings from 30 to 6° before Top Centre (TC). The engine – alternator system is characterised for its performance by the simultaneous measurement of gas and airflow rates, gas composition (on-line), emission levels and power delivered. It is also instrumented to obtain the in-cylinder behaviour in the form of pressure-crank angle (p – θ) diagram to assess the thermodynamic behaviour of the engine. Three-dimensional (3-D) simulation of the flow field in the combustion chamber (involving piston-bowl arrangement) through the cycle up to the start of the combustion is used to obtain inputs on the turbulence intensity (u′) and length scale (l T ) for the modelling of the flame propaga...
Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 2004