Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Department of Automotive Engineering

This paper presents a comprehensive study on using MO (Mahua oil) as fuel effectively in a diesel engine by adopting emulsification and TBC (Thermal Barrier Coating) techniques. A mono cylinder diesel engine was used for the study. Initially trials were made on the engine using neat diesel (ND), Neat Mahua oil (NMO) as fuels. In the second phase, NMO was converted into its stable emulsion (called as MOE) and tested in the engine. Finally thermal barrier coating of 0.2 mm was made on the piston, valves and cylinder head of the engine using the ceramic power of Al2O3 and the engine was tested using NMO and MOE as fuels in the TBC engine. Results indicated improvement in BTE (brake thermal efficiency) with MOE as compared to NMO mainly at high power outputs in the unmodified engine. The maximum BTE was found as 31.5% with ND, 27.2% with NMO and 30.4% with MOE at the peak power output. Reduced smoke, HC (hydrocarbon), CO (carbon monoxide) and NOx (oxides of nitrogen) emissions were found with MOE mainly at high power outputs. Engine with TBC mode significantly increased the performance and reduced all the emissions (except NOx) at all power outputs with both NMO and MOE. Combustion parameters indicated shorter ignition delay and combustion duration with both NMO and MOE under TBC mode. It was concluded that combining emulsification and TBC techniques could improve the performance of a diesel engine significantly using MO as fuel at all power outputs. Copyright © 2017 SAE International.

School of Mechanical Engineering

Vellore Campus

SAE Technical Papers

A Comprehensive Assessment on Combined Effect of Thermal Barrier Coating and Emulsification Techniques on Engine Behavior of a Mahua Oil Based Diesel Engine

A single cylinder CI engine was modified to operate as a LPG fuelled lean burn SI engine. The engine was tested at 1500 rpm and 20% throttle opening at compression ratios 9:1, 10:1, 10.5:1 and 11:1 by varying equivalence ratios. The influence of compression ratio and 15% hydrogen substitution on energy basis at the optimal compression ratio of 10.5:1 on performance, emission and combustion behavior were studied and compared. The brake thermal efficiency and brake power output increases with rise in compression ratio, and above a critical value of 10.5:1 the improvement was small when compared to the increase in emissions. The advantage of brake thermal efficiency from higher compression ratio is narrow under low load conditions. The ever increasing load due to the auxiliaries which are likely to grow more require better low load performance and emissions. Wide flammable limits of hydrogen enable ultra-lean combustion and its anti-knock enhancement makes it advantageous compared to increasing the compression ratio at part throttle condition. Hydrogen addition enhanced the combustion rate and heat release rate, reduced cyclic variations, and extended the lean limit of operation. There was perceptible improvement in brake thermal efficiency, brake power and considerable reductions in hydrocarbon, carbon monoxide and carbon dioxide levels. Due to retarded ignition timing the NOx emission increase was not significant. © 2017 Elsevier Ltd

VIT Unitversity

Department of Electrical Engineering

School of Electrical Engineering

Fuel

Effect of compression ratio and hydrogen addition on part throttle performance of a LPG fuelled lean burn spark ignition engine

Al doped ZnO (AZO) thin films for different compositions were deposited by using solgel technique. Thin film preparation, structural, optical and electrical properties have been studied. Investigations on the effect of structural, optical and electrical properties revealed the relationship that exists between these properties and the film lattice defect distribution. XRD studies showed that AZO thin films a preferred orientation (002) direction, and decrease in the lattice distance indicating a less defected structure. The electrical and optical properties of AZO films have reached a good level. Films with electrical resistivity as low as 1.84 × 10−3 Ω cm and 90 % optical transmittance in the visible region, which is suitable for gas sensing applications. It is found that electrical resistivity was due to increase in concentration of donor atoms. (Received July 8, 2017; Accepted December 20, 2017) © 2017, Virtual Institute of Physics of the Foundation Horia Hulubei. All rights reserved.

World University root node

Journal of Ovonic Research

Synthesis and electrical characterization of aluminium doped zinc oxide thin films

This paper presents a comprehensive study on the influence of different high octane fuels (such as eucalyptus oil, ethanol and methanol) on combustion behaviour of a Mahua oil based dual fuel engine. A single cylinder diesel engine developing a power output of 3.7 kW at 1500 rpm was modified and tested under dual fuel mode of operation. Initially the engine was run using neat diesel (ND), neat Mahua oil (NMO) as fuels. In the second phase, the engine was operated in dual fuel mode by using a specially designed variable jet carburettor to supply the high octane fuels. Engine trials were made at 100% and 40% loads (power outputs) with varying amounts of high octane fuels up to the maximum possible limit. Results indicated significant improvement in combustion pressure and maximum rate of pressure rise in dual fuel operation with all the inducted fuels mainly at 100% load. The ignition delay was found to be higher for all the inducted fuels as compared to single fuel operation for both loads. The combustion duration reduced in dual fuel operation as compared to NMO operation at 100% load but increased at 40% load. Significant improvement in heat release rate was observed in the premixed combustion phase in dual fuel operation as compared to single fuel mode of operation. The optimal energy share for the best combustion behaviour was found to be 44.6%, 27.3% and 23.2% respectively for eucalyptus oil, ethanol and methanol at 100% load. Eucalyptus oil showed the best among the inducted fuels in raising the cylinder peak pressure and heat release rate with reduced ignition delay and combustion duration. In general, dual fuel operation showed inferior combustion behaviour at 40% load for all the inducted fuels. © 2017

A comprehensive assessment on the effect of high octane fuels induction on engine's combustion behaviour of a Mahua oil based dual fuel engine

Supporting Public Protection and Disaster Relief (PPDR) services are mandatory in modern wireless access networks. The sub-1GHz band is particularly suited to provide PPDR services due to the better propagation characteristics and attendant increase in link budget. In this work, we describe a novel transmit mode under a multi-operator non-orthogonal spectrum sharing framework, which can provide robust PPDR waveforms. This Ultra-Reliable Broadcast (URB) solution is based on the Licensed Shared Simultaneous Access (LSSA) broadband wireless access system which has been designed earlier by our group to provide much higher sum-rates in each cell when compared to a single-operator network, by enabling synchronization and different levels of co-operation across multiple TDD operators simultaneously using the same air-interface technology in the same spectrum. Using 19-cell system simulation with appropriate fractional frequency reuse scenarios, we compare the post-processing SINR CDFs of the 4 operator LSSA network and a single operator network, when both of these broadcast a single network-wide PPDR message. Their performances are also compared under disaster conditions where with a probability p, any of the eNodeBs can suddenly fail. We develop and use a simple 3-D stochastic path-loss model to account for users in multi-storey buildings, where depending on the user location the mean value of the shadow loss is varied. Our simulation results in the UHF band (500MHz carrier frequency) indicate that at the 10th percentile of the CDF, under normal operating conditions, the proposed URB solution with four LSSA operators can provide more than 10dB gain in SINR, and for p=0.5, this gain increases to 14dB, when compared to the single operator system. © 2017 IEEE.

GENERAL

Electronics

School of Electronics Engineering

Chennai Campus

2017 IEEE International Conference on Communications Workshops, ICC Workshops 2017

Ultra-Reliable PPDR Broadcast using Licensed Simultaneously Shared Access networks

Advances in Intelligent Systems and Computing Artificial Intelligence and Evolutionary Computations in Engineering Systems

Prediction of Mechanical Soil Properties Based on Experimental and Computational Model of a Rocker Bogie Rover

2017 International Conference on Nascent Technologies in Engineering (ICNTE)

A review and a comparison of Dugoff and modified Dugoff formula with Magic formula

Computer Science

School of Computer Science and Engineering

International Journal of Surface Science and Engineering

Effect of initial roughness and oxidation on the running-in wear of machined surfaces under dry sliding

A Scramjet engine (Supersonic Combusting Ramjet) entails combustion at supersonic flow by generating high pressure through recompression (oblique) shock train. Shock Boundary Layer Interaction (SBLI) is an undesirable phenomenon that occurs inside the scramjet intake which has a detrimental effect on its performance. Due to adverse pressure gradient created by SBLI, the flow might be decelerated to subsonic speeds via normal shock. This leads to unstarting of the engine including other undesirable phenomena such as high drag and increased localized heating. The effect of cowl angle is studied on the performance of the scramjet engine in this study. A scramjet inlet prototype is designed in Solid Works followed by CFD analysis using ANSYS tool. The effects of cowl angle, static pressure rise, total pressure recovery and Flow Distortion are brought out. © IAEME Publication.

Department of Thermal and Energy Engineering

International Journal of Mechanical Engineering and Technology

Effect of cowl angle in the performance of scramjet air intakes

As a plausible source for the next generation heat transfer applications, Nanofluids have attracted many researchers. It became very prominent field in the past decade due to its major change in the physical and thermal properties in microscopic level compared to the same material in macroscopic level. Many experimental research and theoretical investigations have been carried out to study the thermal and physical properties of Nanofluids. Radiators are heat exchangers and used as cooling system in the internal combustion engines. To analyse the cooling performance of the car radiator an experimental setup has been devised. In this experimental study the mixture of ethylene glycol and water combination (40:60) with TiO2 Nanoparticles is used. The volume Concentration of 0.2 % is prepared by mixing TiO2 Nanoparticles with magnetic stirrer. Results of Thermal conductivity, heat transfer is obtained in the temperature range of 50°C to 80°C. Heat transfer is enhanced for the study with Nanofluids compared with the base fluid. © IAEME Publication.

Experimental investigation of radiator performance using tio2 nanofluid