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RISS 인기검색어
- 검색키워드
- 저자 : T. G. Prasad (검색결과 2 건)
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T. Karthikeya Sharma,G. Amba Prasad Rao,K. Madhu Murthy 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.10
Better fuel economy and lower NOx and PM emissions are the two major issues perplexing the researchers as well as new engine developers. Of late a new combustion concept- HCCI has gained popularity in this direction. Low combustion chamber temperatures favorlow NOx emission formation. An attempt is made to study the effect of induction induced swirl in enhancing the rate of heat transfer toattain low in-cylinder temperatures favoring low NOx emissions formation. In this regard a computational study is undertaken in analyzingthe heat distribution to the engine parts in HCCI mode of combustion under four swirl ratios and operating parameters. Extensivenumerical study is carried out on a single cylinder 1.6 L, reentrant piston bowl CI engine. The analysis has been done using ECFM-3Zmodel of STAR-CD. Suitable modifications in the existing code are done to incorporate the HCCI mode of combustion. The ECFM -3Zmodel for HCCI mode of combustion is validated with the existing literature to make sure that the results obtained are accurate. The parameterslike compression ratio and boost pressure are varied under different swirl ratios to analyze the rate of heat transfer in the combustionchamber. The analysis resulted in achieving maximum increased heat transfer rates of 0.88% to the wall with swirl ratio 1,45.66% to the dome and 39.99% to the piston with swirl ratio 4; when the compression ratios are increase from 18 to 21. A maximumincrease in heat transfer rates of 15.82% to the wall, 26.41% to the dome and 27.46% to the piston with compression ratio 21; when theswirl ratio is increase from 1 to 4. Similarly a maximum increased heat transfer rates of 83.75% to the wall with swirl ratio 4, 88.04% tothe dome with swirl ratio 3 and 87.52% to the piston with swirl ratio 4; when the boost pressures are increase from 1 bar to 2 bar wereachieved. A maximum increase in heat transfer rates of 59.35% to the wall with boost pressure 1.5 bar, 81.32% to the dome and 76.34%to the piston with boost pressure 2 bar; when the swirl ratio is increase from 1 to 4 were obtained. The study revealed that apart fromadopting higher compression ratios and boost pressures adoption of high swirl ratios is observed to be contributing to a large extent inenhancing the rates of heat transfer which would lead to significant reduction in in-cylinder temperatures suitable for low NOx emissionformation in HCCI mode.
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Mahesh Patil,T. G. Prasad,S. V. Ramu,P. Jathish,Rohini Sreevathsa,P. Chandrashekar Reddy,M. Udayakumar 한국식물생명공학회 2014 Plant biotechnology reports Vol.8 No.2
Groundnut (Arachis hypogaea L.) is animportant oilseed crop grown in semi-arid tropics where itexperiences moisture stress at different stages of growthresulting in reduced growth and productivity. In this study,we report that the stress tolerance of groundnut can beimproved by overexpression of stress-specific transcriptionfactor through transgenic approach. In silico electronicnorthernanalysis of AtNAC2 showed increased expressionunder different abiotic stresses. The transcript levels of ahomolog of AtNAC2 gene were upregulated under differentdrought regimes in groundnut. Groundnut transgenicsoverexpressing AtNAC2 showed enhanced tolerance todrought and salinity with improved yield under waterlimitedconditions. The study demonstrates that AtNAC2 isa potential candidate gene to improve stress tolerance bytransgenic approach.
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