International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 09 Issue: 09 | Sep 2022
p-ISSN: 2395-0072
www.irjet.net
Wind Load Analysis on High Rise Chimney using Computational Fluid Dynamics Sarvesh Kumar 1, Dr. Sunil Kumar2 1Research
Scholar, Department of Civil Engineering, HBTU Kanpur Department of Civil Engineering, HBTU Kanpur ---------------------------------------------------------------------***--------------------------------------------------------------------2. LITERATURE REVIEW Abstract - The industrial chimneys are tall structures 2Professor,
used to remove gases and fumes boilers. These structures are used in power plants, chemical plants. The objective of this research is to investigate the effect of fluid flow across chimney. Different chimney designs and materials are investigated using CFD technique. The CAD modelling and CFD simulation is conducted using ANSYS CFX software. The critical regions of chimney which are susceptible to high stresses are determined. From the CFD analysis it is evident that the chimney mid-section region is weakest part as compared to base and top. The use of chamfered edges can significantly reduce induced pressure on chimney and is thus beneficial.
YOGANATHAM et. al. [1] have conducted research on RCC chimney using FEM simulation software. The research findings have shown that geometric parameter ratio has significant effect on deformation, natural frequency. SREERATH S et. al. [2] have conducted research on design and analysis of high rise structure using IS code. The structure is also analysed under earthquake and wind loads. The lateral forces have significant effect on structure deformation and base shear. It was found that “the investigation along and across wind behaviors of the structure is needed for slenderness of the structure” [2].
Key Words: Aerodynamics, chimney design, Drag force
LEONARDO et. al. [3] have conducted research on 9 different chimneys located at Chile. The simplified analytical method is prosed by the researcher to determine the natural frequency, lateral deformation and shear force. The chimneys were analysed by considering three effects flex ion, shear and rotational inertia. The research findings have shown that number of elements no longer influences the estimated responses.
1.INTRODUCTION Industrial chimneys are vertical constructions created to reduce the impact of greenhouse gases and other industry substances on its immediate surroundings. This stonework (brick), concrete, or steel structures are used to eject gases generated by industries after completing their production processes. The objective is to reduce the impact these sub-products have on the environment and on humans. Some reduce levels of pollutants while others reduce gas the temperature of the gas. A chimney is a tall, slender structure through which waste gases are discharged into the external atmosphere at a sufficiently high height through the chimney effect. Chimneys are typically vertical or as close to vertical as possible to ensure that the gases flow smoothly, under the influence of what is known as the stack effect or stack effect. The space inside the chimney is called the flue. The height of the chimney significantly affects its ability to remove flue gases to the outside environment through the chimney effect. The function of a chimney is to convey and discharge combustion or flue gases away from the operating area of the industry as well as the human occupancy. The cross section of the chimney is generally hollow circular, from aerodynamic considerations, and tapered, from considerations of structural economy and aesthetics. The chimney is subject to gust buffeting in the along-wind direction due to drag forces, and also to possible vortex shedding in the across-wind direction.
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K. ANIL et. al. [4] have conducted research on industrial chimney under seismic and dynamic loading conditions. The loading conditions included wind speed of 55m/s i.e. for zone II and zone III conditions. M.G. SHAIKH et. al. [5] have conducted research on reinforced tall chimney made of concrete material. The wind load analysis is conducted on chimney by “peak factor” method and “gust factor” method along with random response method. The method used for seismic analysis is response spectrum. At the end the maximum value obtained in wind analysis and seismic analyses are then compared. And the designing value is decided. The effect of “wind forces is quite significant as compared to earthquake forces over 220m height RCC chimney. The geometry of chimney deflection of chimney at the top is within permissible limits” [5]. M. SHIVAJI et. al. [6] have conducted research on RCC chimney using MSC/Nastran software. The response spectrum analysis is conducted on chimney to investigate the base soil structure interaction. The structure soil
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