The paper investigates flow through a representative tall solar chimney with internal bracing wheels. It presents experimental data measured in a 0.63-m-dia model chimney with and without seven bracing wheels. The bracing wheels each had a rim protruding into the chimney and 12 spokes, each spoke consisting of a pair of rectangular section bars. The investigation determined coefficients of wall friction, bracing wheel loss, and exit kinetic energy in a model chimney, for both ideal non-swirling uniform flow and for swirling distorted flow. A fan at one end of the chimney model either sucked or blew the flow through it. The flow entering the chimney through the fan and its diffuser simulated the flow leaving the turbine at the bottom of the chimney. The swirling distorted flow increased the total pressure drop by about 28%, representing 4.7% of the turbine pressure drop. The pressure drop across the bracing wheels exceeded the frictional pressure drop by far. Designers of tall, thin-walled chimneys should take care to minimize the number of bracing wheels, reduce their rim width as much as possible, and investigate the feasibility of streamlining their spoke sections. If at all structurally possible, the top bracing wheel should be far enough from the chimney exit to allow the spoke wakes to decay and the separated flow to re-attach to the chimney wall downstream of the rims before the flow leaves the chimney, to reduce the exit kinetic energy loss.
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Pressure Drop in Solar Power Plant Chimneys
Theodor W. von Backstro¨m,
Theodor W. von Backstro¨m
Department of Mechanical Engineering, University of Stellenbosch, Private Bag X1, Matieland 7602, South Africa
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Andreas Bernhardt,
Andreas Bernhardt
Department of Mechanical Engineering, University of Stellenbosch, Private Bag X1, Matieland 7602, South Africa
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Anthony J. Gannon
Anthony J. Gannon
Department of Mechanical Engineering, University of Stellenbosch, Private Bag X1, Matieland 7602, South Africa
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Theodor W. von Backstro¨m
Department of Mechanical Engineering, University of Stellenbosch, Private Bag X1, Matieland 7602, South Africa
Andreas Bernhardt
Department of Mechanical Engineering, University of Stellenbosch, Private Bag X1, Matieland 7602, South Africa
Anthony J. Gannon
Department of Mechanical Engineering, University of Stellenbosch, Private Bag X1, Matieland 7602, South Africa
Contributed by the Solar Energy Division of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL OF SOLAR ENERGY ENGINEERING. Manuscript received by the ASME Solar Energy Division, March 2002; final revision, October 2002. Associate Editor: R. Pitz-Paal.
J. Sol. Energy Eng. May 2003, 125(2): 165-169 (5 pages)
Published Online: May 8, 2003
Article history
Received:
March 1, 2002
Revised:
October 1, 2002
Online:
May 8, 2003
Citation
von Backstro¨m , T. W., Bernhardt , A., and Gannon, A. J. (May 8, 2003). "Pressure Drop in Solar Power Plant Chimneys ." ASME. J. Sol. Energy Eng. May 2003; 125(2): 165–169. https://doi.org/10.1115/1.1564077
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