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RISS 인기검색어
- 검색키워드
- 저자 : S. M. Mallikarjuna Swamy (검색결과 3 건)
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K. Gurukrishna,H. R. Nikhita,S. M. Mallikarjuna Swamy,Ashok Rao 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.8
A detailed investigation on the temperature dependent electrical properties of Cu2SnSe3system, synthesized via conventionalsolid-state reaction at different sintering temperatures are presented in this communication. All the samples exhibit degeneratesemiconducting nature at low temperatures. The existence of small polarons and hence electron–phonon interactionsare confirmed at temperatures below 400 K. A transition was observed from degenerate to non-degenerate semiconductingbehaviour at high temperatures (T > 400 K). The study confirms the unusual transition in electrical resistivity as well asthermopower at high temperatures in all the compounds, demonstrating the existence of minority carrier excitation alongwith temperature-triggered ionisation of the defects. The transport behaviour is further supported by an upward movementof Fermi level away from the valence band. Highest weighted mobility of 8.2 cm2V−1 s−1 at 673 K was obtained for thesample sintered at 1073 K. A considerable decrease in electrical resistivity with increase in temperature (T > 400 K) hasdriven the power factor to increase exponentially, thereby achieving highest value of 188 μV/mK2 (at 673 K) for the samplesintered at 673 K.
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Nathan, S. Swami,Mallikarjuna, J.M.,Ramesh, A. The Korean Society of Automotive Engineers 2007 International journal of automotive technology Vol.8 No.5
It is becoming increasingly difficult for engines using conventional fuels and combustion techniques to meet stringent emission norms. The homogeneous charge compression ignition(HCCI) concept is being evaluated on account of its potential to control both smoke and NOx emissions. However, HCCI engines face problems of combustion control. In this work, a single cylinder water-cooled diesel engine was operated in the HCCI mode. Diesel was injected during the suction stroke($0^{\circ}$ to $20^{\circ}$ degrees aTDC) using a special injection system in order to prepare a nearly homogeneous charge. The engine was able to develop a BMEP(brake mean effective pressure) in the range of 2.15 to 4.32 bar. Extremely low levels of NOx emissions were observed. Though the engine operation was steady, poor brake thermal efficiency(30% lower) and high HC, CO and smoke were problems. The heat release showed two distinct portions: cool flame followed by the main heat release. The low heat release rates were found to result in poor brake thermal efficiency at light loads. At high brake power outputs, improper combustion phasing was the problem. Fuel deposited on the walls was responsible for increased HC and smoke emissions. On the whole, proper combustion phasing and a need for a well- matched injection system were identified as the important needs.
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Dr. J. M. Mallikarjuna,Mr. S. Swami Nathan,Prof. A Ramesh 한국자동차공학회 2007 International journal of automotive technology Vol.8 No.5
.It is becoming increasingly difficult for engines using conventional fuels and combustion techniques to meet stringent emission norms. The homogeneous charge compression ignition (HCCI) concept is being evaluated on account of its potential to control both smoke and NOx emissions. However, HCCI engines face problems of combustion control. In this work, a single cylinder water-cooled diesel engine was operated in the HCCI mode. Diesel was injected during the suction stroke (0° to 20° degrees aTDC) using a special injection system in order to prepare a nearly homogeneous charge. The engine was able to develop a BMEP (brake mean effective pressure) in the range of 2.15 to 4.32 bar. Extremely low levels of NOx emissions were observed. Though the engine operation was steady, poor brake thermal efficiency (30% lower) and high HC, CO and smoke were problems. The heat release showed two distinct portions: cool flame followed by the main heat release. The low heat release rates were found to result in poor brake thermal efficiency at light loads. At high brake power outputs, improper combustion phasing was the problem. Fuel deposited on the walls was responsible for increased HC and smoke emissions. On the whole, proper combustion phasing and a need for a wellmatched injection system were identified as the important needs.
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