Influence of Blade Row Distance on Performance and Flow Condition of Contra-Rotating Small-Sized Axial Fan

Shigemitsu, Toru; Fukutomi, Junichiro; Shimizu, Hiroki

doi:10.5293/ijfms.2012.5.4.161

Cited by 7 publications

(5 citation statements)

References 4 publications

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“…They eventually observe that the blockage effect of the rear rotor on the flow field close to the front rotor blades trailing edges seems stronger than the effects of the front rotor wake on the rear rotor. The effect of the axial distance between the counter-rotating rotors of an axial-flow fan is studied by Shigemitsu et al [19]. They conclude that the influence of this distance on static pressure rise is stronger at partial flow rate than at design flow rate.…”

Section: Introductionmentioning

confidence: 99%

Flow behavior in a contra-rotating transonic axial compressor

Abbasi

alizadeh

2021

JMES

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This study investigated a three-dimensional flow analysis on a two-stage contra-rotating axial compressor using the Navier–Stokes, continuity, and energy equations with Ansys CFX commercial software. In order to validate the obtained results, the absolute and relative flow angles curves for each rotor in radial direction were extracted and compared with the other investigation results, indicating good agreement. The compressor efficiency curve also was extracted by varying the compressor pressure ratio and compressor efficiency against mass flow rate. The flow results revealed that further distortion of the flow structure in the second rotor imposed a greater increase in the amount of entropy, especially at near-stall conditions. The increase of entropy in the second rotor is due to the interference of the tip leakage flow with the main flow which consequently caused more drops in the second rotor, suggesting that more efficacy of flow control methods occurred in the second rotor than in the first rotor.

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Section: Introductionmentioning

confidence: 99%

Flow behavior in a contra-rotating transonic axial compressor

Abbasi

alizadeh

2021

JMES

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“…Counter-rotating axial turbomachines such as propellers, axial-flow pumps and low-speed fans are used in various industrial domains [1][2][3][4][5][6][7]. In a counter-rotating stage (CRS), the front rotor (FR) and the rear rotor (RR) rotate in opposite directions (see Fig.…”

Section: Introductionmentioning

confidence: 99%

“…The effect of the axial distance between the counterrotating rotors of an axial-flow fan is studied by Shigemitsu et al [5]. They conclude that the influence of this distance on static pressure rise is stronger at partial flow rate than at design flow rate.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on the effect of load distribution on the performances of a counter-rotating axial-flow fan

Ravelet

Bakir

Sarraf

et al. 2018

Experimental Thermal and Fluid Science

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In the design procedure of a counter-rotating axial-flow stage, parameters such as the angular velocity ratio and the repartition of the work performed by each rotors are to be chosen. In the present Article, three counter-rotating stages are designed to meet the same working point. These stages have different repartitions of load between the front and rear rotor, different angular velocity ratios or mean stagger angles of the blades of the front rotors. The stage global characteristics and the unsteady features of the flow between the counter-rotating rotors are measured and compared. The three systems all have satisfying overall performances at the design point. Strong differences are observed in the flow field at partial flow rates, the rear rotor reducing the hub recirculation. The behaviour at partial flow rates is thus triggered by the rear rotor characteristics. The best compromise is obtained with a repartition of the loading of 60% for the front rotor and 40% for the rear rotor, with almost equal angular velocities.

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“…Zhang et al [9] found it was meaningless to lengthen the axial gap when it was over 80% of the chord and the optimal axial gap was about 70%. Shigemitsu et al [10] discussed the influences on the performance and the noise of axial distance. They showed the interaction between the front and the rear rotors.…”

Section: Introductionmentioning

confidence: 99%

The Acoustical Behavior of Contra-Rotating Fan

Kou

Liu

2018

Mathematical Problems in Engineering

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The noise produced by a contra-rotating ventilator can cause injury to humans. Therefore, it is important to reduce noise caused by ventilators. In this study, the Ffowcs Williams and Hawkings (FW-H) model was used to simulate the acoustics of four different axial impeller spacing points based on the unsteady flow field through a FBD No. 8.0 contra-rotating ventilator. Experiments were conducted to verify the correctness of the numerical model. Meanwhile, the Variable Frequency Drive (VFD) drives the two motors of 55 kW to give the impellers different speeds to distinguish different conditions. The results showed that the main noise source of the ventilator was the two rotating impellers and the area between them. For the same axial space, the noise decreased with the increase of flow rate and then decreased. And the amplitude of the discrete pulse increased gradually. It can be concluded that the vortex acoustics decreased gradually with the increase of flow rate and the rotating acoustics were the major contributor. With the axial distance increasing, the noise caused by the two impellers was weak, and the frequencies of sound pressure level moved toward medium-and low-frequency bands gradually. The suitable axial space could reduce noise and improve the working environment.

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Influence of Blade Row Distance on Performance and Flow Condition of Contra-Rotating Small-Sized Axial Fan

Cited by 7 publications

References 4 publications

Flow behavior in a contra-rotating transonic axial compressor

Flow behavior in a contra-rotating transonic axial compressor

Experimental investigation on the effect of load distribution on the performances of a counter-rotating axial-flow fan

The Acoustical Behavior of Contra-Rotating Fan

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