2007
DOI: 10.1016/j.expthermflusci.2007.04.008
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On the structure of turbulence in a low-speed axial fan with inlet guide vanes

Abstract: This paper analyzes the structure of turbulence in a single stage, low-speed axial fan with inlet guide vanes. Turbulence intensity values and integral length scales have been obtained using hot-wire anemometry for three different operating points and two different axial gaps between the stator and the rotor. These measurements were carried out in two transversal sectors, one between the rows and the other rotor downstream, covering the whole span of the stage for a complete stator pitch. Since total unsteadin… Show more

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Cited by 24 publications
(23 citation statements)
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“…In these studies, complemented also with numerical simulations [33][34][35], a multi-point traversing system was employed to obtain detailed distributions of the velocity field in several windows covering the passage span for a complete stator pitch. The data set obtained from this facility has been used to investigate many different flow phenomena including wake dispersion and wake transport [35][36], mean flow, turbulent structures and integral length scales [36][37], deterministic stresses [38] and secondary flows and tip vortex in similar fans [39][40]. At present day, as an alternative to the costly experimental campaigns, computational modelling has become an extended, well-mature discipline, especially useful in the design process.…”
Section: Introductionmentioning
confidence: 99%
“…In these studies, complemented also with numerical simulations [33][34][35], a multi-point traversing system was employed to obtain detailed distributions of the velocity field in several windows covering the passage span for a complete stator pitch. The data set obtained from this facility has been used to investigate many different flow phenomena including wake dispersion and wake transport [35][36], mean flow, turbulent structures and integral length scales [36][37], deterministic stresses [38] and secondary flows and tip vortex in similar fans [39][40]. At present day, as an alternative to the costly experimental campaigns, computational modelling has become an extended, well-mature discipline, especially useful in the design process.…”
Section: Introductionmentioning
confidence: 99%
“…It would be very interesting to better characterize these interactions with phase-locked time-resolved measurements such as described in Refs. [12,13]. The effect of the number of blades in each rotor may also be addressed in forthcoming experiments, with JW1 rotors of same blade cascade parameters but different blade numbers, and focusing on acoustical behaviour of the counter-rotating stages.…”
Section: Resultsmentioning
confidence: 99%
“…Strong unsteady interactions between the rotors may lead to large acoustic noise emission [11] and may affect the performances of the stage [12,13]. When designing a counter-rotating stage, some parameters such as the distribution of the total work between the two rotors or the ratio of the rotation rates have to be chosen, this choice being most often somehow arbitrary.…”
Section: Introductionmentioning
confidence: 99%
“…In [6] a Lagrangian method was used to find the flow characteristics of an airfoil. Many of today's compressors have guide vanes with variable stagger angles [7][8][9]. Variations in stagger angle of guide vane including geometrical variations of the stage would be resulted in variation of the stage's characteristic curves.…”
Section: Introductionmentioning
confidence: 99%