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International Journal of Engineering Research and Technology (IJERT), 2013
https://www.ijert.org/computational-fluid-dynamics-simulation-and-optimization-of-a-gas-turbine-inlet-duct https://www.ijert.org/research/computational-fluid-dynamics-simulation-and-optimization-of-a-gas-turbine-inlet-duct-IJERTV2IS90292.pdf The overall aim of this paper is to identify the best inlet for gas turbine, which will have the minimum pressure loss and well guided flow profile. The experimental and computational studies are carried out on sharp edge inlet, convergent inlet at various semi angles and bell mouth inlet at various bend radiuses. The experimental method is carried out to find the velocities of various Inlet Duct models by using hot wire anemometer in order to identify its Total Pressure Losses (∆P). In this project work, 3D Finite Volume Models and Computational Fluid Dynamics (CFD) analyses of inlet ducts are used to determine the Total Pressure loss (∆P). A progressively refined tetrahedral finite element mesh is created using Pre-processing procedure in ANSYS software. ANSYS CFX-Pre-processor is employed to define the properties of flow and simulation can be obtained from ANSYS CFX-Postprocessor. From the Experimental and CFD results, we can conclude that bell mouth inlet produces a minimum pressure loss and uniform flow compared to Sharp edge and Converging Inlets. The present work on inlet ducts is useful in engine test cells, intake runner of reciprocating engine and on engines installed in helicopters.
Air intake system of a 160 MW gas turbine cycle has been modeled and analyzed using numerical simulation in a full 3D perspective. Analysis was carried out using the commercial numerical simulation software, FLUENT 6.3. Inputs and Boundary condition gathered from the design working condition of a Siemens V94.2 gas turbine, installed in the Khoramshahr power plant. This paper deals with flow pattern simulation in order to improve the pressure loss and flow characteristic of the gas turbine compressor inlet. The understanding developed with reference to recirculation flows and non-uniform flow over the whole air intake system, provides valuable insights to designers for optimization of components for better efficiency.
IRJET, 2020
SUPRA SAE is the formula student racing event, organized by SAE India, where students from all over India participate in event and apply their engineering knowledge to make the best formula-style racing car. The primary function of the intake manifold is to draw the air from the atmosphere and distribute it evenly to each cylinder and enhance the volumetric efficiency and power output of the engine. In this paper, we have reviewed the design, calculation, material selection, manufacturing process and optimization of intake manifold and restrictor. According to the rule of the competition, a 20mm diameter restrictor should be placed at the start of the intake manifold and all the air should pass through it. As restrictor restricts the mass flow rate going to the engine which results in reducing the volumetric efficiency, torque and power output of the engine, causing reduction in the overall performance of the engine. So, it becomes a challenging task for a student to design the intake manifold with an optimized restrictor which can allow maximum air to flow through it with minimum pressure losses and improved volumetric efficiency, torque, and power output. The overall design of intake manifold & restrictor is done using the solid works. The description of simulation of the intake manifold and restrictor is done using Ricardo software, WAVE for 1D simulation and VECTIS for 3D simulation and CFD using Ansys is also reviewed in this paper for the selection of better geometry of intake manifold.
International journal of physical sciences
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 inle...
IRJET, 2021
Gas turbines have an important role in electric power generation and are used in a variety of configurations. Turbine rotor blades are the most important components in a gas turbine power plant and are mainly affected due to static loads. Use of rib turbulators is an effective technique to enhance the rate of heat transfer to gas flow in the gas turbine blades which enhances its cooling by creating turbulence over the boundary of the wall. The heat transfer in turbulent boundary layer will be more when compared to the laminar boundary layer. In this work, Analysis Sharp ribs of sizes 3mm, 6mm & 9mm in rectangular channels are used, and the flow analysis is determined with the help of ANSYS15 .In this research the Reynolds number of the range of 10000 and 15000 are analyzed for various parameters like temperature and velocity. It is predicted that the ribs of different sizes will enhance the heat transfer rate and pressure drop in the rectangular channel section. Also the Temperature variations, Wall Heat Transfer Coefficient, Average Heat Transfer Coefficient, Friction factor, Velocity, Pressure drop of developed turbulent flow in rectangular channel of cross section 100*80*300mm are compared.
In the recent era, energy is more preferred to be produced from renewable energy resources rather than from non-renewable resources. Both non-renewable and renewable energy resources have their own limitations such as the set up cost for renewable is high whereas pollution from non-renewable is high. Based on the limitations, researchers focused on the emission control in automobiles rather than using non-renewable sources. This forms the major objective for the engine designers to achieve lowest possible emission level with efficient combustion. Studies on emission level reduction shows that the flow harnessing in the intake manifold of IC engine can yield improvement in engine torque up to 10% along with a nominal decrease in emission level. The researches reveal that the optimization of an intake manifold plays an important role in manifold design to maximize the mass of air inducted into the cylinder for efficient combustion. Traditional manufacturing of intake manifolds and the trial and error method to select an optimized manifold is time-consuming and cost-effective. This work focuses on the design of an intake manifold with the different configuration such as normal, convergent and venture types and the study of the airflow through each designed manifolds has been performed using CFD. On comparison of the analysis results, an optimized intake manifold which allows maximum air flow inside the cylinder has been selected for efficient combustion.
International Journal of Engineering Research and Technology (IJERT), 2019
https://www.ijert.org/design-and-analysis-of-a-combustion-chamber-in-a-gas-turbine https://www.ijert.org/research/design-and-analysis-of-a-combustion-chamber-in-a-gas-turbine-IJERTCONV7IS11010.pdf Gas turbines are preferred over new crucial movers for power generation due to its low specific fuel consumption. The gas turbine power plants and steam turbine bottoming cycle are used as co-generation technique for refining overall efficiency of the plant. Hence combustion chamber of gas turbine should provide obligatory chemical kinetics and species generation with effective cooling of flame tube. The paper deals with the design of a combustion chamber in a gas turbine engine and it has to be designed based on the constant pressure, enthalpy process. The approach deals with the computation of the initial design parameters of the combustion chamber. New computational analysis method are continuously developed in order to rectify the problems occur in gas turbine and the various analytical configuration of the combustor has to be calculated based on different realistic formulas. The air-fuel mixture, combustion turbulence, thermal and cooling analysis is carried out. The computational analysis of combustion chamber performed at various scenarios and compared by using k-€ Turbulence tool in ANSYS CFX software.
The turbine blades are responsible for extracting energy from the high temperature gas produced by the combustor. Operating the gas turbine blade at high temperatures would provide better efficiency and maximum work output. These turbine blades are required to withstand large centrifugal forces, elevated temperatures and are operated in aggressive environments. To survive in this difficult environment, turbine blades often made from exotic materials. A key limiting factor in gas turbine engines is the performance of the materials available for the hot section of the engine especially the gas turbine blades. Gas turbine is an important functional part of many applications. Cooling of blades has been a major concern since they are in a high temperature environment. Various techniques have been proposed for the cooling of blades and one such technique is to have axial holes along the blade span. Finite element analysis is used to analyse thermal and structural performance due to the loading condition, with four different material like ZiCr5 Zirconium Chromite (existing material), mullet, AlSi Aluminum Silicate, Titanium Alloy.Two different models with different number of holes perforated 4 and 6 were analysed in this paper to find out the optimum number of holes for good performance. Using ANSYS, Equivalent stress, deflection, temperature distribution for 4 and 6 number of perforated holes are analysed. It is found that when the numbers of holes are increased in the blade, the temperature distribution falls down.
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