Srihari S. currently serves as Assistant Professor at Department of Mechanical Engineering, School of Engineering, Coimbatore Campus. His areas of research include IC Engines and Thermal Engineering.


Publication Type: Journal Article

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Srihari S., Dr. Thirumalini S., and Prashanth, K., “An experimental study on the performance and emission characteristics of PCCI-DI engine fuelled with diethyl ether-biodiesel-diesel blends”, Renewable Energy, vol. 107, pp. 440 - 447, 2017.[Abstract]

Abstract The possible depletion of fossil fuels has created the need for alternate fuels worldwide and engine developers are prompted to investigate the viability of such fuels. Further, stringent emission norms have created the need for low emission engines. The objective of this work is to evaluate the effect of diethyl ether in biodiesel-diesel blends on the performance and emission characteristics in a Premixed Charge Compression Ignition-Direct Injection (PCCI-DI) engine. Biodiesel obtained from cotton seed oil is used for this study. PCCI-DI engine is operated with main injection and pilot injections with varying percentages of \{DEE\} along with 20% biodiesel blended with neat diesel. The emission characteristics show a discernible reduction in emissions (NOx, \{CO\} and HC) vis-a-vis biodiesel-diesel blends. Benefits like reduction in the quantum of smoke produced and improvement in Brake thermal efficiency are also noticed in specific cases.

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D. Vignesh and Srihari S., “Investigation on performance and emission behaviour of a single cylinder diesel engine fuelled with mixture of cottonseed and sunflower biodiesel blends along with diesel”, International Journal of Applied Engineering Research, vol. 10, pp. 40265-40269, 2015.[Abstract]

Nowadays alternative fuels are gaining more importance because of depleting crude oil resources, high rise in fuel prices, and environmental degradation due to exhaust pollutants. Transesterification process is mostly preferred for conversion of vegetable oils into useable bio diesel fuel. In the present work, performance investigation and emission examination is done on single cylinder diesel engine by usage of mixture of methyl esters of cottonseed oil and sunflower oil without doing any modifications in the engine. Here cotton seed oil methyl ester addition was kept constant as 5% by volume. For the study, both oil methyl esters were mixed and were added to diesel fuel, by volume of 10%, 15%, 20%, 25% and 30%. The effect of blends on brake specific fuel consumption and brake thermal efficiency were compared with baseline pure diesel values. Emission tests were conducted for finding the effect of blends on unburnt hydrocarbons, carbon monoxide, nitrogen oxides and smoke. A slight increase in brake thermal efficiency was found for lower blends across various loading conditions. Smoke and exhaust emission decreases on usage of higher biodiesel blends. The results indicated that 20% biodiesel blend can be replaced without any major engine modifications as it gives better performance and emission characteristics. © Research India Publications.

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M. K. Lalith, Dinesh, A., Unnikrishnan, S., Radhakrishnan, A., Srihari S., and Dr. Ratna Kishore V., “Modeling of homogeneous mixture formation and combustion in GDI engine with negative valve overlap”, ISRN Mechanical Engineering, vol. 12, no. 1, 2013.[Abstract]

Mixture homogeneity plays a crucial role in HCCI engine. In the present study, the mixture homogeneity was analysed by three-dimensional engine model. Combustion was studied by zero-dimensional single zone model. The engine parameters studied include speed, injector location, valve lift, and mass of fuel injected. Valve lift and injector location had less impact on mixture formation and combustion phasing compared to other parameters. Engine speed had a noticeable effect on mixture homogeneity and combustion characteristics. © 2013 M. K. Lalith et al.

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Publication Type: Conference Paper

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M. S. Sabarish, Srihari S., Arunaa, T. S. Swathi, and Dr. Dhanesh G. Kurup, “Simulation and design of a chipless passive RFID Tag”, in International Conference on Advances in Electronics, Computers and Communications (ICAECC), 2014 , Bangalore, 2014.[Abstract]

RFID is an object identification and tracking technology worth several billion dollars today. Chipless technology doesn't require communication protocols and IC, making it cheaper. Passive RFID Tags use backscattering technique to send information to the Reader. In this paper, we present a passive RFID Tag based on Ultra-wide band technology. The chipless RFID tag modeled uses passive elements, namely antennas and transmission lines in different architectural orders by varying the lengths and the number of the transmission lines. The unique identities of the tags are characterized by the number and the lengths of the transmission lines and hence a large number of tags can be manufactured economically with a finite number of transmission lines. The technology involves transmission of nanosecond duration pulses which enables high precision time of arrival (TOA) estimation of signal. The software tool used to simulate this system is Linux based open source software development toolkit called GNURadio. It has a predefined set of signal processing blocks and has the provision to code user defined blocks and enables us to represent the RFID system using standard programming languages namely C++ and Python.

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