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DESIGNING AND DETAILING OF BUILDING SYSTEMS. MECHANICS IN CIVIL ENGINEERING

AERODYNAMICS OF SWIRLING FLOWS IN GAS OUTLET PIPES OF HEAT GENERATING PLANTS

Vestnik MGSU 2/2012
  • Vadim Kajumovich Ahmetov - Moscow State University of Civil Engineering (MSUCE) Doctor of Technical Sciences, Professor, Department of Informatics and Applied Mathematics, Moscow State University of Civil Engineering (MSUCE), 26 Jaroslavskoe shosse, Moscow, 129337, Russia; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 41 - 46

The intermixing of hot turbulent gases in an axisymmetric channel with lateral surfaces of arbitrary shape and a pre-swirled flow is considered in the paper. This problem is relevant in connection with the development of new high-tech designs of natural fuel combustion facilities. Any designs are to comply with specific requirements. The temperature of the flue gas must not fall below a certain limit to prevent promotion of condensation that facilitates pipe corrosion. The gas outlet velocity must exceed 4 m/s to prevent the downdraft. The concentration of pollutants released into the atmosphere must fall within permissible limits. The mathematical model is based on parabolized Navier-Stokes equations that restrict its applicability to continuous flows. However, in view of the mechanical nature of the problem considered, continuous flows are of particular interest. The method of equal flow-rate surfaces is used as a numerical solution. The system of equations is based on streamlines. The net of lines is not available beforehand; therefore, it is constructed alongside with the problem solution. The system of equations is completed by an algebraic turbulence model. The proposed method makes it possible to check for the optimal flow regimes inside high-rise stack structures to assure that pollutant-containing smokes and gases, emitted into the atmosphere, produce the minimal damage onto the environment.

DOI: 10.22227/1997-0935.2012.2.41 - 46

References
  1. Ahmetov V.K., Shkadov V.Ja. Chislennoe modelirovanie vjazkih vihrevyh techenij dlja tehnicheskih prilozhenij [Numerical Modelling of Viscous Vortcity Flows for Technological Applications], a monograph, Moscow, ASV, 2009,176 p.
  2. Tan B.T., Liow K.S., Mununga L., Thompson M.C., Hourigan K. Simulation of the Control of Vortex Breakdown in a Closed Cylinder Using a Small Rotating Disk, Physics of Fluids, 2009, Issue # 21, pp. 024104-8.
  3. Sreenivasan B., Davidson P.A. On the Formation of Cyclones and Anticyclones in a Rotating Fluid, Phys. Fluids, 2008, Issue # 20, 085104-11.
  4. Samarskij A.A., Nikolaev E.S. Metody reshenija setochnyh uravnenij [Methods of Solving Finite-Difference Equations], Moscow, Nauka, 1978, 592 p.
  5. Leonard B.P. A Stable and Accurate Convective Modeling Procedure Based on Quadratic Upstream Interpolation, Comp. Meth. Appl. Mech and Eng, 1979, Issue # 1, pp. 59—98.
  6. Lopez J.M. Rotating and Modulated Rotating Waves in Transitions of an Enclosed Swirling Flow, Journal of Fluid Mechanics,2006, Issue # 553, pp. 323—346.
  7. Gelfgat A. Yu., Bar-Yoseph P.Z. Multiple Solutions and Stability of Confined Convective and Swirling Flows – a Continuing Challenge, International Journal of Numerical Methods for Heat & Fluid Flow, 2004, Issue # 14, pp. 213-241.
  8. Sponh A., Mory M., Hopfinger E.J. Experiments on Vortex Breakdown in a Confined Flow Generated by a Rotating Disc, J. Fluid Mech, 1998, Issue # 370, pp. 73—99.

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AERODYNAMICS OF SWIRLING FLOWS IN GAS OUTLET PIPES OF HEAT GENERATING PLANTS

Vestnik MGSU 3/2012
  • Akhmetov Vadim Kayumovich - Moscow State University of Civil Engineering (MSUCE) Doctor of Technical Sciences, Professor, Department of Informatics and Applied Mathematics 8 (499) 183-59-94, Moscow State University of Civil Engineering (MSUCE), 26 Yaroslavskoe shosse, Moscow, 129337, Russia; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 30 - 34

The intermixing of hot turbulent gases in an axisymmetric channel with lateral surfaces of arbitrary shape and a pre-swirled flow is considered in the paper. This problem is relevant in connection with the development of new high-tech designs of natural fuel combustion facilities. Any designs are to comply with specific requirements. The temperature of the flue gas must not fall below a certain limit to prevent promotion of condensation that facilitates pipe corrosion. The gas outlet velocity must exceed 4 m/s to prevent the downdraft. The concentration of pollutants released into the atmosphere must fall within permissible limits. The mathematical model is based on parabolized Navier-Stokes equations that restrict its applicability to continuous flows. However, in view of the mechanical nature of the problem considered, continuous flows are of particular interest. The method of equal flow-rate surfaces is used as a numerical solution. The system of equations is based on streamlines. The net of lines is not available beforehand; therefore, it is constructed alongside with the problem solution. The system of equations is completed by an algebraic turbulence model. The proposed method makes it possible to check for the optimal flow regimes inside high-rise stack structures to assure that pollutant-containing smokes and gases, emitted into the atmosphere, produce minimal damage onto the environment.

DOI: 10.22227/1997-0935.2012.3.30 - 34

References
  1. Volkov E.P., Gavrilov E.I., Duzhikh F.P. Gazootvodyashchie truby TES i AES [Gas-Flue Pipes of Thermal and Nuclear Power Plants]. Moscow, Energoatomizdat, 1987, 278 p.
  2. Farouk T., Farouk B., Gutsol A. Simulation of Gas Species and Temperature Separation in the Counter Flow Ranque-Hilsch Vortex Tube Using the Large Simulation Technique. International Journal of Heat and Mass Transfer, 2009, V. 52, no. 13—14, pp. 3320—3333.
  3. Huang Y., Yang V. Dynamics and Stability of Lean-premixed Swirl Stabilized Combustion. Progress in Energy and Combustion Science, 2009, Volume 35, no. 4, pp. 293—364.
  4. Shkadov V.Ya. Nekotorye metody i zadachi teorii gidrodinamicheskoy ustoychivosti [Some Methods and Problems of Hydrodynamic Stability]. Moscow, In-t mekhaniki MGU [Institute of Mechanics of Moscow State University], Academic Works, no. 25, 1973,160 p.
  5. Akhmetov V.K., Shkadov V.Ya. Chislennoe issledovanie retsirkulyatsionnykh zon v vikhrevoy kamere [Numerical Research of Recirculation Zones of the Vortex Chamber]. Aeromekhanika i gazovaya dinamika [Air Mechanics and Dynamics of Gases]. 2003, no. 3, pp. 39—45.

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