Abstract
Discussion of numerical flow field prediction with two rotor-stator interface models is presented in the paper. The mixing plane and harmonic models are applied to contra rotating fan. Both models confirmed good performance and high power density leading to compact configuration of the contra rotating fan compared to centrifugal fan. The harmonic model provides realistic wake and potential effect propagation through the rotor-rotor interface. In addition, it provides user with static pressure frequency and amplitude inputs for aerodynamic noise assessment.
Highlights
Fan performance and air flow rate have notable effect on overall performance of drying cycle
There are several, usually contradicting, requirements a fan must fulfil in drying process in terms of flow rate, pressure rise, noise and installation space
The Contra rotating axial fan (CRF) configuration is known form long time and its advantages have been confirmed by many studies [1,2,3]
Summary
Fan performance and air flow rate have notable effect on overall performance of drying cycle. There are several, usually contradicting, requirements a fan must fulfil in drying process in terms of flow rate, pressure rise, noise and installation space. Absolute velocity (m/s) Contra Rotating Fan specific internal energy (J/kg) imaginary unit harmonic number mixing plane number of harmonics angular speed of blade passing frequency reference pressure (Pa) Cartesian spatial vector Reynolds Averaged NavierStokes density (kg/m3). High performance and compact fan designs are required for today domestic air-drying applications. Contra rotating axial fan (CRF) represents very compact, yet powerful. The accurate numerical performance prediction, making use of mixing plane and harmonic method, and flow structure of a CRF is the subject of the investigation described in the paper
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