Unsteady Flow Pattern Characteristics Downstream of a Forward-Curved Blades Centrifugal Fan

Velarde-Suáréz, Sandra; Ballesteros-Tajadura, Rafael; Santolaria-Morros, Carlos; González-Pérez, José

doi:10.1115/1.1351175

Cited by 35 publications

(19 citation statements)

References 12 publications

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“…And most of them focus their attentions on the FC multi-blade, BC blades and radial blades centrifugal fans. With respect to the noise generation mechanism of centrifugal fans, Velarde-Suárez et al [4,5], Younsi et al [6] and Lin et al [7] studied the unsteady flow and aerodynamic tonal noise of FC multi-blade centrifugal fans. In the other paper, Sasaki [8] explored the influence of Karman Vortex Street on the broadband noise generated from an FC multi-blade fan.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the noise reduction of an industrial forward-curved blades centrifugal fan

Mao

Liu

et al. 2009

Applied Acoustics

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Section: Introductionmentioning

confidence: 99%

Experimental study on the noise reduction of an industrial forward-curved blades centrifugal fan

Mao

Liu

et al. 2009

Applied Acoustics

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“…Both POD and SDP techniques are used to complement previous efforts of the research group, according to different previous publications. [19][20][21][22] It can be considered in the frame of previous works by the same working team, see for instance, Velarde-Sua´rez et al, 9 Ballesteros-Tajadura et al 11,19 Gonza´lez et al 20,21 and Delgado et al 22 Regarding the SDP method, interesting recent contributions are those by Bianchi et al 18 and Wu et al, 23 for slightly different machines and Shibata et al 17 for a generic rotating machine.…”

Section: And Cui and Craigheadmentioning

confidence: 99%

Experimental study of the unsteady vibration signature for a Sirocco fan unit

González

Delgado

Velarde-Suáréz

et al. 2019

Journal of Low Frequency Noise, Vibration and Active Control

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The small forward-curved blades known as Sirocco fan units are very common and widespread solution for air conditioning used in public transportation applications, as buses or trains. The users quietness and comfort have become a main concerns in the automotive industry. For such kind of turbomachinery flow , the patterns becomes always highly 3D and unsteady, compromising the referred comfort, and setting the focus on the working flow variables. A mathematically exact solution for that flow, which would provide any required information on pressure or forces, is out of scope at the current engineering design processes. Nevertheless, some flow features and mechanical data are needed to progress in the frame of a modern industrial environment, involving maintenance protocols with important temporal and economic constraints for different design procedures. The correctness of a given maintenance protocol relies on its feasibility to handle a set of machine working parameters or variables, including a number of them as wide as possible. Doing so, a set of not-dangerous ranges for them can be established. Such ranges are often defined promoting a series of failures similar to real ones, when the machine is in its operative lifetime. In this paper and in order to establish proper working ranges for maintenance purposes, a series of failures have been experimentally tested for a Sirocco fan unit. Initially, real data from industry have been required and a list of main failures was made, including (1) impeller or rotor unbalance, (2) impeller channel obstruction and (3) blocked inlet. The failures are studied using a purified orbit diagram (POD) technique and a symmetrized dot pattern (SDP) technique. All four working conditions are studied for at least three different flow rates and, therefore, a deeper insight into the fan working parameters and options are made feasible. In the frame of the maintenance protocol, a full set of ranges for the considered failures has been obtained. Therefore, the present paper shows a novel possibility to enhance existing maintenance protocol using two advanced frequency-based techniques.

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“…A purified orbit diagram (POD) technique is used to complement previous efforts of the research group, according to different previous publications. 9,10,11,[20][21][22][23] It can be considered in the frame of previous works by the same working team, see, for instance, Velarde-Sua´rez et al, 9 Ballesteros-Tajadura et al, 11,20 Gonza´lez et al 21 and Delgado et al 22,23 Experimental set-up and measurements For the particular application, a squirrel cage fan unit to be studied is built with a pair of twin impellers' unit, arranged as shown in Figure 1 (left sketch). The two impellers are placed on both sides of the electrical motor and supported by the two sides of the shaft in cantilever, from its central position.…”

Section: Introductionmentioning

confidence: 99%

Purified orbit diagram and numerical study for a failure analysis of a Sirocco fan

González

Delgado

Oro

et al. 2017

Advances in Mechanical Engineering

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Sirocco fan units are very common and widespread solution for air conditioning used in public transportation applications (buses or trains). The users' comfort and tranquillity are main concerns in the automotive industry. Inside such turbomachines, the flow structure always becomes highly three dimensional and unsteady, compromising the referred comfort, and sets the focus on the working flow variables. A mathematically exact solution for that flow, which would provide any required information on pressure or forces, is out of scope at the current engineering design processes. Nevertheless, some flow features and mechanical data are needed to progress in the frame of a modern industrial environment, which each time more strongly, besides the different design procedures, involves maintenance protocols. The correctness of a given maintenance protocol relies on its feasibility to handle a set of machine working parameters or variables, including a number of them as wide as possible. Doing so, a set of non-dangerous ranges for them can be established. Such ranges are often defined promoting a series of failures similar to real ones, when the machine is in its usable lifetime. In what refers to the flow analysis, a reasonably good tool has been developed using a computational fluid dynamics technique and, from the experiments, a better understanding of the fan operating conditions is accomplished. For a Sirocco fan unit and to establish proper working ranges for maintenance purposes, a series of failures have been experimentally and numerically tested. Initially, real data from industry have been required and a list of main failures was made. It included impeller or rotor unbalance, impeller channel obstruction and blocked inlet. The first two failures are studied using a purified orbit diagram technique and the last one is numerically analysed. All four working conditions are studied for at least three different flow rates and, therefore, a deeper insight into the fan working parameters and options is made feasible. In the frame of the maintenance protocol, a full set of ranges for the considered failures have been obtained.

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Unsteady Flow Pattern Characteristics Downstream of a Forward-Curved Blades Centrifugal Fan

Cited by 35 publications

References 12 publications

Experimental study on the noise reduction of an industrial forward-curved blades centrifugal fan

Experimental study on the noise reduction of an industrial forward-curved blades centrifugal fan

Experimental study of the unsteady vibration signature for a Sirocco fan unit

Purified orbit diagram and numerical study for a failure analysis of a Sirocco fan

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