Numerical analysis of heat transfer and fluid flow in rotary regenerative air pre-heaters
Alagić, Sandira (Author), Stošić, Nikola (Author), Kovačević, Ahmed (Author), Buljubašić, Indira (Author)

URLURL - Presentation file, Visit http://www.dlib.si/details/URN:NBN:SI:doc-M5MZJMK4 This link opens in a new window

The Ljungström rotary air pre-heater is a regenerative heat exchanger used for preheating the combustion air, mainly in steam boiler plant. The hot gas and cold air ducts are arranged to allow both the flue gas and the inlet air to flow simultaneously through the machine. The hot flue gas heats the rotor material and as the rotor rotates, the hot rotor section moves into the flow of the cold air and preheats it. Existing simulations of regenerative air pre-heaters are mainly based on empirical approximations where some of the effects of the process are neglected. Although this usually gives reasonably acceptable results, it was thought that CCM analysis of such devices, which stands for Computational Continuum Mechanics, would result in a better understanding of the process features, such as the fluid-solid interaction. A grid interface was developed to transfer the geometry of such a Ljungström airpre-heater to a finite volume numerical mesh which is later used for the calculation of unsteady fluid-solid interactions. Results were obtained by useof the commercial CCM solver ĆCometĆ of Star CD. In this paper the results are presented in the form of diagrams of the velocity and temperature fields as functions of time and space. The results of both the one- and three-dimensional calculations and field measurements are compared and good agreement was achieved. The result of this study is the development of an effective procedure for computer calculation of processes in a Ljungström air pre-heater to optimise its parameters, which can be used either for research and development or in everyday engineering practice.

Keywords:prenos toplote, tok fluida, numerične analize, zračni predgrelniki, regeneratorji toplote, energijske bilance, simuliranje 3D, heat transfer, fluid flow, numerical analysis, air pre-heaters, rotary generators, energy balance, 3D simulations
Work type:Not categorized (r6)
Tipology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Publisher:Association of Mechanical Engineers and Technicians of Slovenia et al.
Number of pages:Str. 411-417
Numbering:Letn. 51, št. 7/8
ISSN on article:0039-2480
COBISS.SI-ID:8623899 Link is opened in a new window
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Record is a part of a journal

Title:Strojniški vestnik
Shortened title:Stroj. vestn.
Publisher:Zveza strojnih inženirjev in tehnikov Slovenije [et al.], = Association of Mechanical Engineers and Technicians of Slovenia [et al.]
COBISS.SI-ID:762116 This link opens in a new window

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