Performance of a gas turbine is mainly depends on the inlet air temperature. The power output of ... more Performance of a gas turbine is mainly depends on the inlet air temperature. The power output of a gas turbine depends on the flow of mass through it. This is precisely the reason why on hot days, when air is less dense, power output falls off. A rise of 1°C temperature of inlet air decreases the power output by 1%. The aim of this paper is to review up to date techniques that were developed to cool inlet air to gas turbine. The techniques including the mechanical chillers, media type evaporative coolers and absorption chillers have been reviewed. It is found that the power consumption of the cool inlet air is of considerable concern since it decreases the net power output of gas turbine. In addition, the mechanical chiller auxiliary power consumption is very high compared to media type evaporative coolers. Furthermore, the reviewed works revealed that the efficiency of evaporative cooler largely depends on moisture present in the air. The gas turbine power augmentation through inl...
International Journal of Research in Engineering and Technology, 2014
In recent decade, industry had started to use intensively 3D simulation in compressor flow path a... more In recent decade, industry had started to use intensively 3D simulation in compressor flow path and its components design. Designing an Axial Compressor is more an art than science, because one has to vary the parameters by his intuition. Slight variation in one parameter may lead to large variation in another parameter. There are several options to improve the design but it requires enormous time and effort, as each step of designing and analysis is pretty time consuming. Further this design can be optimized with several options available. This paper reports design and optimization of an axial flow compressor, using a uniform approach to solution on theoretical design problems. Preliminary design was carried out for a set of design parameters and tested for stall at different speed and mass flow rate for given pressure ratio. Modeling was performed using 1D and 2D simulations, as the loss parameters were in limits blade modeling was done using blade profiling and 2D analysis. 3D simulation both CFD and FEA were performed. The results of optimized design shown a close agreement with the theoretical design in terms of mass flow rate at given speed for rated pressure ratio with wide stall margin at low losses in less time for limited given input.
Diesel engines are very well known for their high torque and high initial thermal efficiency. But... more Diesel engines are very well known for their high torque and high initial thermal efficiency. But the increase in demand of energy rapid depletion of fossil fuels and meeting the stringent emission regulations, the researchers take interest to derive the alternative fuels from renewable sources. Due to the petroleum shortage the researchers take interest in finding the alternative fuels for internal combustion engine. There are various types of alternative fuels available for internal combustion engine but biodiesel is most important alternative to diesel engine. Biodiesel is popular due to its renewability, lower exhaust emissions, and biodegradability In a Shirpur region the mostly fast growing, very easily available and very cheap plant available is Cottonseed Plant. The cottonseed crop is a fast growing plant and that grows even on drought and poor soils. Cotton was the third biggest crops grown worldwide as measured by acreage: soybean which is 47%, occupying 75.4 million hecta...
Microprocessor has become the heart of home/office PC systems. The microprocessor device require ... more Microprocessor has become the heart of home/office PC systems. The microprocessor device require electrical energy for their work, the electrical energy is converted into heat energy this may affect the performance of a microprocessor. Heat sink was used to control the temperature of microprocessor in permissible limit. There are various parameters like heat sink material, fin thickness, number of fins, spacing between two fins, base plate thickness and fin shape etc. which affects the performance of heat sink. Material is one of the parameter that increase heat transfer rate. If copper is used in place of aluminium then heat transfer rate increases but at the same time cost also increases. The heat sink base plate thickness is parameter for improvement. When the base plate thickness was increased, the heat sink performed better. However, there are space limitations for every heat sink in a computer. Also the increase in number of fin was not a solution for improving heat transfer. ...
Of late, the rapid development in the technology and multimedia capability in digital cameras and... more Of late, the rapid development in the technology and multimedia capability in digital cameras and mobile devices has led to ever increasing number of images or multi-media data to the digital world. Particularly, in natural scene images, the text content provides explicit information to understand the semantics of images. Therefore, a system developed for extracting and recognizing texts accurately from natural scene images, in real-time, has significant relevance to numerous applications such as, assistive technology for people with vision impairment, tourist with language barrier, vehicle number plate detection, street signs, advertisement bill boards, robotics, etc. The extraction of the texts from natural scene images is a formidable task due to large variations in character fonts, styles, sizes, text orientations, presence of complex backgrounds and varying light conditions. The main focus of this research paper is to propose a novel hybrid approach for automatic detection, loc...
Optimization of airfoil shape using evolutionary algorithms is becoming a trend in design of blad... more Optimization of airfoil shape using evolutionary algorithms is becoming a trend in design of blades for turbomachines and aircraft. Evolutionary algorithms work with parameterization of airfoil shape, i.e. representation of airfoil with the help of some parameters which control its shape. Thus, one of the challenges in this field is to describe the airfoil with suitable parameters and explicit or implicit mathematical functions. This paper discusses various parameterization techniques being used to parameterize the airfoil.
International Journal of Fluid Machinery and Systems
This paper deals with the Design and Analysis of a Controlled Diffusion Aerofoil (CDA) Blade Sect... more This paper deals with the Design and Analysis of a Controlled Diffusion Aerofoil (CDA) Blade Section for an Axial Compressor Stator and Effect of incidence angle and Mach No. on Performance of CDA. CD blade section has been designed at Axial Flow Compressor Research Lab, Propulsion Division of National Aerospace Laboratories (NAL), Bangalore, as per geometric procedure specified in the U.S. patent (4). The CFD analysis has been performed by a 2-D Euler code (Denton's code), which gives surface Mach No. distribution on the profiles. Boundary layer computations were performed by a 2-D boundary layer code (NALSOF0801) available in the SOFFTS library of NAL. The effect of variation of Mach no. was performed using fluent. The surface Mach no. distribution on the CD profile clearly indicates lower peak Mach no. than MCA profile. Further, boundary layer parameters on CD aerofoil at respective incidences have lower values than corresponding MCA blade profile. Total pressure loss on CD aerofoil for the same incidence range is lower than MCA blade profile.
Performance of a gas turbine is mainly depends on the inlet air temperature. The power output of ... more Performance of a gas turbine is mainly depends on the inlet air temperature. The power output of a gas turbine depends on the flow of mass through it. This is precisely the reason why on hot days, when air is less dense, power output falls off. A rise of 1°C temperature of inlet air decreases the power output by 1%. The aim of this paper is to review up to date techniques that were developed to cool inlet air to gas turbine. The techniques including the mechanical chillers, media type evaporative coolers and absorption chillers have been reviewed. It is found that the power consumption of the cool inlet air is of considerable concern since it decreases the net power output of gas turbine. In addition, the mechanical chiller auxiliary power consumption is very high compared to media type evaporative coolers. Furthermore, the reviewed works revealed that the efficiency of evaporative cooler largely depends on moisture present in the air. The gas turbine power augmentation through inl...
International Journal of Research in Engineering and Technology, 2014
In recent decade, industry had started to use intensively 3D simulation in compressor flow path a... more In recent decade, industry had started to use intensively 3D simulation in compressor flow path and its components design. Designing an Axial Compressor is more an art than science, because one has to vary the parameters by his intuition. Slight variation in one parameter may lead to large variation in another parameter. There are several options to improve the design but it requires enormous time and effort, as each step of designing and analysis is pretty time consuming. Further this design can be optimized with several options available. This paper reports design and optimization of an axial flow compressor, using a uniform approach to solution on theoretical design problems. Preliminary design was carried out for a set of design parameters and tested for stall at different speed and mass flow rate for given pressure ratio. Modeling was performed using 1D and 2D simulations, as the loss parameters were in limits blade modeling was done using blade profiling and 2D analysis. 3D simulation both CFD and FEA were performed. The results of optimized design shown a close agreement with the theoretical design in terms of mass flow rate at given speed for rated pressure ratio with wide stall margin at low losses in less time for limited given input.
Diesel engines are very well known for their high torque and high initial thermal efficiency. But... more Diesel engines are very well known for their high torque and high initial thermal efficiency. But the increase in demand of energy rapid depletion of fossil fuels and meeting the stringent emission regulations, the researchers take interest to derive the alternative fuels from renewable sources. Due to the petroleum shortage the researchers take interest in finding the alternative fuels for internal combustion engine. There are various types of alternative fuels available for internal combustion engine but biodiesel is most important alternative to diesel engine. Biodiesel is popular due to its renewability, lower exhaust emissions, and biodegradability In a Shirpur region the mostly fast growing, very easily available and very cheap plant available is Cottonseed Plant. The cottonseed crop is a fast growing plant and that grows even on drought and poor soils. Cotton was the third biggest crops grown worldwide as measured by acreage: soybean which is 47%, occupying 75.4 million hecta...
Microprocessor has become the heart of home/office PC systems. The microprocessor device require ... more Microprocessor has become the heart of home/office PC systems. The microprocessor device require electrical energy for their work, the electrical energy is converted into heat energy this may affect the performance of a microprocessor. Heat sink was used to control the temperature of microprocessor in permissible limit. There are various parameters like heat sink material, fin thickness, number of fins, spacing between two fins, base plate thickness and fin shape etc. which affects the performance of heat sink. Material is one of the parameter that increase heat transfer rate. If copper is used in place of aluminium then heat transfer rate increases but at the same time cost also increases. The heat sink base plate thickness is parameter for improvement. When the base plate thickness was increased, the heat sink performed better. However, there are space limitations for every heat sink in a computer. Also the increase in number of fin was not a solution for improving heat transfer. ...
Of late, the rapid development in the technology and multimedia capability in digital cameras and... more Of late, the rapid development in the technology and multimedia capability in digital cameras and mobile devices has led to ever increasing number of images or multi-media data to the digital world. Particularly, in natural scene images, the text content provides explicit information to understand the semantics of images. Therefore, a system developed for extracting and recognizing texts accurately from natural scene images, in real-time, has significant relevance to numerous applications such as, assistive technology for people with vision impairment, tourist with language barrier, vehicle number plate detection, street signs, advertisement bill boards, robotics, etc. The extraction of the texts from natural scene images is a formidable task due to large variations in character fonts, styles, sizes, text orientations, presence of complex backgrounds and varying light conditions. The main focus of this research paper is to propose a novel hybrid approach for automatic detection, loc...
Optimization of airfoil shape using evolutionary algorithms is becoming a trend in design of blad... more Optimization of airfoil shape using evolutionary algorithms is becoming a trend in design of blades for turbomachines and aircraft. Evolutionary algorithms work with parameterization of airfoil shape, i.e. representation of airfoil with the help of some parameters which control its shape. Thus, one of the challenges in this field is to describe the airfoil with suitable parameters and explicit or implicit mathematical functions. This paper discusses various parameterization techniques being used to parameterize the airfoil.
International Journal of Fluid Machinery and Systems
This paper deals with the Design and Analysis of a Controlled Diffusion Aerofoil (CDA) Blade Sect... more This paper deals with the Design and Analysis of a Controlled Diffusion Aerofoil (CDA) Blade Section for an Axial Compressor Stator and Effect of incidence angle and Mach No. on Performance of CDA. CD blade section has been designed at Axial Flow Compressor Research Lab, Propulsion Division of National Aerospace Laboratories (NAL), Bangalore, as per geometric procedure specified in the U.S. patent (4). The CFD analysis has been performed by a 2-D Euler code (Denton's code), which gives surface Mach No. distribution on the profiles. Boundary layer computations were performed by a 2-D boundary layer code (NALSOF0801) available in the SOFFTS library of NAL. The effect of variation of Mach no. was performed using fluent. The surface Mach no. distribution on the CD profile clearly indicates lower peak Mach no. than MCA profile. Further, boundary layer parameters on CD aerofoil at respective incidences have lower values than corresponding MCA blade profile. Total pressure loss on CD aerofoil for the same incidence range is lower than MCA blade profile.
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Papers by Nilesh Salunke