Optimization of the thermal and fluid dynamic behaviour of air curtains: analysis of the plenum by means of LES
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Tipus de documentText en actes de congrés
Data publicació2012
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Abstract
The improvement procedure of an air curtain unit (ACU) is described in the present study. The procedure is based on Large Eddy Simulations (LES) and Hot Wire Anemometry (HWA) measurements. Initially, the flow provided by the air curtain is evaluated experimentally according to the AMCA standard [1] and employing HWA technology. The initial measurements indicate an undesired behavior of the device: the velocity at the discharge exhibits a non homogeneous distribution. According to the literature, the efficiency of air curtains is closely related to its capacity to provide an homogeneous jet with high enough velocity and with low turbulence levels [2]. On this study, the criteria for optimization applied to the plenum chamber consist in finding out what design increases both the homogeneity and the mean velocity values produced at the discharge. An air curtain producing a jet with these features will minimize the air interchange between outdoor and indoor spaces. Alternative plenums are evaluated by means of fully 3D LES. Previous works indicate that a fully three-dimensional treatment is required in the simulations of ACUs [3], due to its no-bidimensional behaviour. The results of the simulations indicate that a more smooth plenum is required to avoid recirculations. The prototype of the designs with the best behavior, according to the simulations, are constructed and its flow are characterized with HWA measurements. The measurements show consistent results with LES. It is concluded that the proposed plenum geometry improves the initial design both in homogeneity and in mean velocity values at the discharge. The downstream jet evolution is characterised with semianalytical and experimental approaches. The code TermoFluids[4] has been used for the simulations of the plenum.
CitacióGiraldez, H. [et al.]. Optimization of the thermal and fluid dynamic behaviour of air curtains: analysis of the plenum by means of LES. A: Conference on Modelling Fluid Flow. "Proceedings of Conference on Modelling fluid flow CMFF'12 (edited by J. Vad), September 4-7, 2012, Budapest , ISBN/ISSN: 978-963-08-4588-5". 2012, p. 176-182. ISBN 978-963-08-4588-5.
ISBN978-963-08-4588-5
Versió de l'editorhttp://cataleg.upc.edu/record=b1419227~S1*cat
Col·leccions
- CTTC - Centre Tecnològic de la Transferència de Calor - Ponències/Comunicacions de congressos [278]
- Departament de Màquines i Motors Tèrmics - Ponències/Comunicacions de congressos [492]
- TUAREG - Turbulence and Aerodynamics in Mechanical and Aerospace Engineering Research Group - Ponències/Comunicacions de congressos [74]
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