Papers by Dr. SUKANTA ROGA
i-manager's journal on mechanical engineering, 2018
This article is a review of the properties of boron carbide (B 4 C)-reinforced polymer composites... more This article is a review of the properties of boron carbide (B 4 C)-reinforced polymer composites. B 4 C have recently become attractive to researchers, engineers, and scientists as an alternative reinforcement for polymer composites due to its attractive physical and mechanical characteristics. The tensile strength of the B 4 C-reinforced epoxy was lower than the neat epoxy due to the poor bonding of the materials. Various surface treatments of the reinforcement were suggested in the literature to improve the bonding between the reinforcement and the matrix. B 4 C addition improved the elastic modulus of the epoxy. No clear trend was observed for the flexural behavior of the same. It was mainly dependent on the type of epoxy used and size and concentration of reinforcement. A higher B 4 C particulate addition in epoxy improved the hardness values of the composites. There was a marginal improvement in the shear strength of the B 4 C-reinforced composites. The commonly observed plasticization tendency of epoxy after moisture absorption was less severe when epoxy was reinforced with B 4 C particulates. Poor anchoring of B 4 C particulates in the resin hampered the wear resistance of the composite. The situation further worsens after moisture absorption. However, cavitation erosion behavior of the composite improved and limited to localized areas.
Energy Converters for Wind Turbines: Implementation of Control Methods
2022 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES)
Assessment of Sessional Solar Energy Using PVsyst and SAM
Studies in Infrastructure and Control, 2023
Economic Emission Dispatch with wind Farms using Opposition based Competitive Swarm Optimizer
2022 IEEE International Conference on Power Electronics, Drives and Energy Systems (PEDES)
Experimental analysis of hybrid VAWT and the effect of semi-cylindrical attachment to the trailing edge
Energy for Sustainable Development
Advanced Composite Materials, 2020
This article is a review of the properties of boron carbide (B 4 C)-reinforced polymer composites... more This article is a review of the properties of boron carbide (B 4 C)-reinforced polymer composites. B 4 C have recently become attractive to researchers, engineers, and scientists as an alternative reinforcement for polymer composites due to its attractive physical and mechanical characteristics. The tensile strength of the B 4 C-reinforced epoxy was lower than the neat epoxy due to the poor bonding of the materials. Various surface treatments of the reinforcement were suggested in the literature to improve the bonding between the reinforcement and the matrix. B 4 C addition improved the elastic modulus of the epoxy. No clear trend was observed for the flexural behavior of the same. It was mainly dependent on the type of epoxy used and size and concentration of reinforcement. A higher B 4 C particulate addition in epoxy improved the hardness values of the composites. There was a marginal improvement in the shear strength of the B 4 C-reinforced composites. The commonly observed plasticization tendency of epoxy after moisture absorption was less severe when epoxy was reinforced with B 4 C particulates. Poor anchoring of B 4 C particulates in the resin hampered the wear resistance of the composite. The situation further worsens after moisture absorption. However, cavitation erosion behavior of the composite improved and limited to localized areas.
EAI Endorsed Transactions on Energy Web, 2018
Vertical axis wind turbines received renewed attention for increasing offshore wind energy harves... more Vertical axis wind turbines received renewed attention for increasing offshore wind energy harvesting and in urban environments. This turbine reflects a specific type of technology that generates electricity from wind, which is renewable sources of energy. This research explores the effect of blade profile modifications on the VAWT aerofoil NACA0012 and NACA2415. Analysis of the lift/drag coefficient and calculation of the average torque/self-starting potential of NACA0012 and NACA2415 for NACA0012, as this is a significantly better measure of the power generated at different pitch angles and comparison of both profiles. The dataset is created using Computational Fluid Dynamics (CFD) simulations, which were performed in ANSYS-Fluent. Various parameters, such as the number, thickness, and angle of attack of the Reynolds no. were investigated. The aerodynamics of the wind turbine blade is shown to increase the optimized form of the modified aerofoil.
Computational Analysis of Scramjet Combustor using Wedge-Shaped Strut Injector for Energy Conversion at Mach 5
CompSciRN: Computational (Topic), 2018
This work address the computational analysis of scramet engine combustion chamber with strut inje... more This work address the computational analysis of scramet engine combustion chamber with strut injector at supersonic Mach 5. The fuel used by strut injectors is hydrogen, the fluid flow and the work is based on the species transport combustion model with standard k-ε turbulence model. It is implied for supersonic combustion that the ramjet engine is focused for operating high speed engines. The combustion chamber assists as an envelope to clutch the propellant for a satisfactory period to certify complete mixing as well as combustion. It is signified for scramjet combustor using with strut injector aimed to operate in the high velocity regime form energy conversion. As hydrogen is injected to the supersonic flow of air combustion takes place inside the scramjet combustor; thus heat energy started to produce. The maximum temperature of 2940K is produced at the recirculating zone whereas the combustion efficiency is found to be almost 87% for the present work. Further firmness method i...
Feature Based Automated Detection of COVID-19 from Chest X-Ray Images
Emerging Technologies During the Era of COVID-19 Pandemic, 2021
Nowadays the biggest challenge for health care is controlling the pandemic of Coronavirus disease... more Nowadays the biggest challenge for health care is controlling the pandemic of Coronavirus disease 2019 (COVID-19). Radiological investigation combining with machine learning can serve as a standardized methodology for detecting COVID-19. Chest X-ray imaging is the most feasible radiological test for COVID-19. Machine learning-based automated classification of COVID-19 from chest X-ray images can act as an assistive method to the medical experts for accurate diagnosis of disease. Aiming at this, the study focused on developing a simplified method of X-ray image based computerized COVID-19 detection through conventional feature extraction and classification approach. The method of X-ray image based COVID-19 detection consists of only two main steps: feature extraction, and classification. In feature extraction, a total of 55 X-ray image texture features is extracted from seven different groups. Classification of COVID-19 has been performed using those extracted features through four d...
Edge Feature Based Classification of Breast Thermogram for Abnormality Detection
Nowadays, breast cancer is the most commonly occurring cancer among women. Early diagnosis of suc... more Nowadays, breast cancer is the most commonly occurring cancer among women. Early diagnosis of such disease improves the survival rate. Mammography is considered as the gold standard for the diagnosis of breast disease. But a frequent examination of the breast through mammography increases the chance of cancer occurrence due to radiation effect. However, taking advantage of non-radiating nature of thermography, it can be used for regular screening of breast region temperature distribution noninvasively. The presence of an inflammatory region in a breast thermogram is a signal of abnormality. In a thermogram, the inflammation is represented with higher gray level pixels. Observing this, in this study we aim to classify sick and healthy breast thermograms by comparing the edge features of the images. For the elimination of unwanted edges, the anisotropic diffusion is used as the filtering process of thermograms before edge detection. The outcome of the Artificial Neural Network-based c...
Air Pollution Monitoring Using Blue Channel Texture Features of Image
Journal of Physics: Conference Series, 2019
The present work address the CFD analysis for scramjet combustor with diamond-shaped strut inject... more The present work address the CFD analysis for scramjet combustor with diamond-shaped strut injectors at supersonic Mach 4.5 and it’s based on species transport combustor which is standard k-epsilon turbulence model. It is implied for supersonic combustion that the ramjet engine is focused for operating high speed engines. The combustion chamber assists as an envelope to clutch the propellant for a satisfactory period to certify complete mixing as well as combustion. The diamond-shaped strut injector gives the maximum temperature and pressure of 3517 K and 1.487 MPa respectively whereas the combustion efficiency is found to be 87.2%. The shear layers losses are extremely minimize the performance of the engine, thus interpreting trade-off programmes in a very difficult way to achieve maximum combustion efficiency. Further firmness by machines is essential for achieving higher combustion efficiency.
Numerical Analysis of Supersonic Combustion Using Strut Injector with Turbulent Non-Premixed Combustion Model
ABSTRACT
International Journal of Advanced Trends in Computer Science and Engineering
This work presents the supersonic combustion of hydrogen using ramp injector along with two-dimen... more This work presents the supersonic combustion of hydrogen using ramp injector along with two-dimensional turbulent non-premixed combustion model. The work is based on the standard k-ω which has been used for modeling the turbulence and single step finite rate chemistry. As the combustion of hydrogen fuel is injected from the strut injector, it is successfully used to model the turbulent reacting flow field. It is observed from the present work that, the maximum temperature occurred in the recirculation areas which is produced due to shock wave-expansion and the fuel jet losses concentration and after passing successively through such areas, temperature decreased slightly along the axis. From the maximum mass fraction of OH, it is observed that there is very little amount of OH around 0.019 were found out after combustion. By providing strut injector, expansion wave is created which cause the proper mixing between the fuels and air which results in complete combustion.
Computational Analysis of Hydrogen-Fueled Scramjet Combustor Using Cavities in Tandem Flame Holder
Applied Mechanics and Materials, 2015
This work presents the computational analysis of scramjet combustor using cavities in tandem flam... more This work presents the computational analysis of scramjet combustor using cavities in tandem flame holder by means of 3D. The fuel used by scramjet combustor with cavities in tandem flame holder is hydrogen, the fluid flow and the work is based on the species transport combustion with standard k-ε viscous model. The Mach number at inlet is 2.47 and stagnation temperature and static pressure for vitiated air are 1000K and 100kPa respectively. These computational analysis is mainly aimed to study the flow structure and combustion efficiency. The computational results are compared qualitatively and quantitatively with experimental results and these are agreed as well. Due to the combustion, the recirculation region behind the cavity injector becomes larger as compared to mixing case which acts as a flame holder. From the analysis, the maximum Mach number of 2.33 is observed in the recirculation areas.
Computational Analysis of Hypersonic Combustor Using Strut Injector at Flight Mach 7
Combustion Science and Technology, 2015
Numerical analysis of the hypersonic combustion and flow structure through a scramjet engine at a... more Numerical analysis of the hypersonic combustion and flow structure through a scramjet engine at a flight Mach 7 with parallel fuel injection at different angles of attack, α = (−5°), 0°, and 5° have been studied in the present research article. The scramjet configuration incorporates an inlet angle of 8° compression ramp followed by an insulator and a divergent combustor for parallel injection. The shape of the strut is chosen such that it produces strong stream- wise vorticity and thus enhances the air/fuel mixing. These numerical simulations were aimed to study the flow structure, supersonic mixing, and combustion efficiency. For parallel injection investigation, the influence of the strut injector and the variation of angle of attack on the flow behavior in reacting cases have been studied. The shock structure and combustion phenomenon are affected by the combustor geometry, flight Mach number, and by the trajectory.
Wall static pressure variation in sudden expansion in cylindrical ducts with supersonic flow: A fuzzy logic approach
2010 Second International Conference on Machine Learning and Computing, 2010
In this paper the analysis of wall static pressure variation has been done with fuzzy logic appro... more In this paper the analysis of wall static pressure variation has been done with fuzzy logic approach to have smooth flow in the duct. Here there are three area ratio chosen for the enlarged duct, 2.89, 6.00 and 10.00. The primary pressure ratio is taken as 2.65 and cavity aspect ratio is taken as 1 and 2. The study is
CFD Analysis of Hypersonic Combustion of H2-Fueled Scramjet Combustor with Cavity Based Fuel Injector at Flight Mach 6
Applied Mechanics and Materials, 2014
This paper presents a numerical analysis of the inlet-combustor interaction and flow structure th... more This paper presents a numerical analysis of the inlet-combustor interaction and flow structure through a scramjet engine at a flight Mach 6 with cavity based injection. Fuel is injected at supersonic speed of Mach 2 through a cavity based injector. These numerical simulations are aimed to study the flow structure, supersonic mixing and combustion for cavity based injection. For the reacting cases, the shock wave pattern is modified which is due to the strong heat release during combustion process. The shock structure and combustion phenomenon are not only affected by the geometry but also by the flight Mach number and the trajectory. The inlet-combustor interaction is studied with a fix location of cavity based injection. Cavity is of interest because recirculation flow in cavity would provide a stable flame holding while enhancing the rate of mixing or combustion. The cavity effect is discussed from a view point of mixing and combustion efficiency.
Computational Analysis of Supersonic Combustion Using Wedge-Shaped Strut Injector with Turbulent Non-Premixed Combustion Model
International Journal of Soft Computing
... No.:+91 -9401926567, (e-mail: [email protected] ... P.Manna & D.Chakraborty et al.[1... more ... No.:+91 -9401926567, (e-mail: [email protected] ... P.Manna & D.Chakraborty et al.[18] shows that, the reacting/low field of hydrogen-air combustion behind a backward fating step in a constant area combustor which is simulated numerically by solving three-dimensional ...
CFD Analysis of Scramjet Combustor with Non-Premixed Turbulence Model Using Ramp Injector
Applied Mechanics and Materials, 2014
This paper presents the supersonic combustion of hydrogen using strut injector along with two-dim... more This paper presents the supersonic combustion of hydrogen using strut injector along with two-dimensional turbulent non-premixed combustion model with air inlet temperature of 750 0k and vitiated Mach number of 2. In this process, a PDF approach is created and this method needs solution to a high dimensional PDF transport equation. As the combustion of hydrogen fuel is injected from the strut injector, it is successfully used to model the turbulent reacting flow field. It is observed from the present work that, the maximum temperature of 2096 0k occurred in the recirculation area which is produced due to shock wave-expansion and the fuel jet losses concentration and after passing successively through such areas, temperature decreased slightly along the axis. From the maximum mass fraction of OH, it is observed that there is very little amount of OH around 0.0017 were found out after combustion. By providing strut injector, expansion wave is created which causes the proper mixing bet...
Uploads
Papers by Dr. SUKANTA ROGA