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Vinayak Kulkarni

Bio: Vinayak Kulkarni is an academic researcher from Indian Institute of Technology Guwahati. The author has contributed to research in topics: Hypersonic speed & Drag. The author has an hindex of 16, co-authored 96 publications receiving 789 citations. Previous affiliations of Vinayak Kulkarni include Indian Institute of Technology Bombay & University of Rennes.


Papers
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Journal ArticleDOI
TL;DR: In this article, the performance of the Savonius hydrokinetic turbine (SHT) has been evaluated through simulation and experimental and computational fluid dynamics (CFD) analysis.

98 citations

Journal ArticleDOI
TL;DR: In this paper, the effectiveness of honeycomb and honeycomb-screen combinations, in reducing swirl and turbulence level in the test section, is studied by simulating the flowfield using commercial computational fluid dynamics (CFD) package ANSYS-CFX.

69 citations

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TL;DR: In this article, a two dimensional finite volume based CFD solver has been developed and implemented successfully to study the shock-wave boundary layer interaction and associated changes in wall properties for ramp induced flow breakdown.

55 citations

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TL;DR: In this article, the effect of film cooling on the aerodynamic characteristics of a large angle blunt cone flying at hypersonic Mach number was investigated by measuring surface heat-transfer rates and aerodynamic drag coefficient simultaneously.
Abstract: Effectiveness of film cooling technique to reduce convective heating rates for a large angle blunt cone flying at hypersonic Mach number and its effect on the aerodynamic characteristics is investigated experimentally by measuring surface heat-transfer rates and aerodynamic drag coefficient simultaneously. The test model is a 60° apex-angle blunt cone with an internally mounted accelerometer balance system for measuring aerodynamic drag and an array of surface mounted platinum thin film gauges for measuring heat-transfer rates. The coolant gas (air, carbon dioxide, and/or helium) is injected into the hypersonic flow at the nose of the test model. The experiments are performed at a flow free stream Mach number of 5.75 and 0° angle of attack for stagnation enthalpies of 1.16 MJ/kg and 1.6 MJ/kg with and without gas injection. About 30%–45% overall reduction in heat-transfer rates is observed with helium as coolant gas except at stagnation regions. With all other coolants, the reduction in surface heat-transfer rate is between 10%–25%. The aerodynamic drag coefficient is found to increase by 12% with helium injection whereas with other gases this increase is about 27%.

54 citations

Journal ArticleDOI
TL;DR: In this paper, the effect of various operating parameters on the performance, combustion and emission characteristics have been reviewed and a discussion on the implementation of such technologies in various rural localities of India considering the biomass potential of the country was addressed.
Abstract: Compression Ignition (CI) engine is used to generate power for various stationary applications in remote places due to the non-availability of centralised grid connectivity. The burning diesel in CI engine leads to fossil fuel depletion and environmental degradation. Hence, there is a huge demand of generating remote electricity by utilizing available renewable resources with the help of existing CI engines. In this paper biogas (BG) and producer gas (PG) based CI engine technology for remote electricity generation in India has been reviewed. The study is organised in two sections. The first section focused on conceptualizing the influence of these gaseous fuels in CI engine as secondary fuel under dual fuel (DF) mode with diesel/biodiesel as pilot fuel. The effect of various operating parameters on the performance, combustion and emission characteristics have been reviewed. It is evident from the study that induction of gaseous fuel declines the engine performance to some extent, however emission characteristics reported to be enhanced. However, changes in the operating conditions bring with immense scope in the improvement of the engine performance. The study develops a clear understanding on the possibilities of these gases to be used as a primary source for generating rural electricity. In the second section, a discussion on the implementation of such technologies in various rural localities of India considering the biomass potential of the country has been addressed. An exhaustive review is also carried out on various electricity generating units in India powered by BG and PG individually. The literature on use of combined BG and PG units for energy generation are limited and no suitable economic model has been developed considering these gases for rural power generation. This study provides a complete insight to every pros and cons associated with such power generating units and its socio-economic impacts on rural livelihood.

45 citations


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01 Jan 2014
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Abstract: If you have an eBook, video tutorials, or other books that can help others, KnowFree is the right platform to share and exchange the eBooks freely. While you can help each other with these eBooks for educational needs, it also helps for self-practice. Better known for free eBooks in the category of information technology research, case studies, eBooks, Magazines and white papers, there is a lot more that you can explore on this site.

402 citations

Journal ArticleDOI
TL;DR: In this paper, the authors examined the diesel engine characteristics for various fractions of diethyl ether (DEE) as an oxygenated fuel additive in cottonseed oil biodiesel-diesel fuel blends.

154 citations

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TL;DR: In this article, the authors present a survey of the use of spikes for reducing both the drag and the aeroheating by modifying the flowfield ahead of the vehicle's nose.

150 citations

Journal ArticleDOI
TL;DR: In this paper, the authors present a comprehensive literature review on three active cooling methods, i.e., regenerative cooling, film cooling, and transpiration cooling, including the fluids flow, heat transfer, and thermal cracking characteristics of different hydrocarbon fuels.

148 citations

Journal ArticleDOI
TL;DR: It was demonstrated from the review that most of the research yield favourable results of engine modelling prediction for both of the methods, and a high degree of determination coefficient indicating that the model could predict the model efficiency with reasonable accuracy.
Abstract: Alternative fuel is one of the widely used fuel substitutions for both petrol and diesel in the field of internal combustion engine. The increase in the demand for alternative fuel is currently driven by the requirement of decreasing engine fuel consumption and fulfilling the stringent engine exhaust emissions pollutant regulations. In order to effectively tackle the aforementioned concerns, it appears that through engine experimental analysis alone for both engine performance and exhaust emissions is insufficient. Recently, the need for engine modelling based on statistical and machine learning methodologies through response surface and artificial neural network technique, respectively, are non-trivial to provide a better decision support analysis. Therefore, the present study reviews the extent to which the application of these methods in various alternative fuel in both spark and compression ignition engine to investigate their viability. The paper also describes herein the ways to determine the accuracy and the significance of model fitting for both methodologies. It was demonstrated from the review that most of the research yield favourable results of engine modelling prediction for both of the methods. It can be concluded the comparison between predicted and experimental results provided a high degree of determination coefficient indicating that the model could predict the model efficiency with reasonable accuracy.

128 citations