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Research Papers

Internal Flow and Noise Investigations About the Cross-Flow Fan With Different Blade Angles

[+] Author and Article Information
Hua Ouyang

Jie Tian1

You Li

 School of Mechanical Engineering,  Shanghai Jiao Tong University, 800 Dongchuan Road, Minhang District, Shanghai 200240, ChinaLee_U1980@sjtu.edu.cn

Zhiming Zheng

 Daikin Air-Conditioning and Environmental Laboratory, Ltd., 1304 Kanaoka-cho, kita-ku, Sakai-shi, Osaka 591-8511, Japanzhiming.zheng@daikin.co.jp

Zhaohui Du

 School of Mechanical Engineering,  Shanghai Jiao Tong University, 800 Dongchuan RD. Minhang District, Shanghai 200240, Chinazhdu@sjtu.edu.cn

1

Corresponding author

J. Turbomach 134(5), 051023 (May 11, 2012) (9 pages) doi:10.1115/1.4004485 History: Received April 11, 2011; Revised June 22, 2011; Published May 11, 2012; Online May 11, 2012

The experimental and numerical studies have been carried out to investigate the flow and the noise characteristics of the three impellers with different blade angles in a cross-flow fan (CFF). First, the aerodynamic performances of the fan with these impellers are obtained experimentally, and the averaged flow patterns inside the impellers are measured by the three-hole probe. Second, the far-field noise generated by CFF with different impellers has been measured in a semianechoic chamber under different throttling conditions. Third, the two-dimensional unsteady CFD simulations have been performed by commercial software. The internal flow patterns influenced by the different blade angles have been summarized through the computational results. The accuracy of the calculations is validated by the corresponding experimental ones. The detail analysis has been carried out on the unsteady vortex flow properties of the three impellers, which is considered to be the main factor that influences the aerodynamic and aeroacoustic performance of the CFF. Finally, the relative far field noise generated by different impellers are evaluated by an empirical formula based on the assumption that the total sound pressure levels are proportional to the sixth power law of the relative velocity on the outer and inner circumferences of the impeller. The circumferential distributions of relative velocity are provided from the numerical solutions. The varying trends of predicted results agree well with the actual relative noise of the CFF with three different impellers.

Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Sectional view about CFF. The four regions include inflow region (IF), discharged flow region (DF), reversed flow region around tongue (RFT), and reversed flow region around casing (RFC).

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Figure 2

Geometric parameters about three impellers

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Figure 3

The sketch of aerodynamic performance test rig

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Figure 4

Dimensionless experimental and calculated curve about flow rate and static pressure (p0p1 )

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Figure 5

Static efficiency curve with flow coefficient. Operating condition selected for base is φ = 0.472.

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Figure 6

The settings about the test of three-hole probe

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Figure 7

The measurement grid (261 nodes) inside the impeller at half of the axial length of one block

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Figure 8

The scene about aeroacoustic measurement

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Figure 9

The measured total SPL about three impellers with flow coefficients

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Figure 11

Grid sensitivity test results. Top: averaged results of torque coefficient with grid number. Bottom: monitored unsteady results of mesh 1, 2, and 3 during the last five blade passages’ time.

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Figure 12

Sketch about the integral surface for noise prediction

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Figure 13

Static pressure distribution within the impeller

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Figure 14

Total pressure distributions within the impeller

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Figure 15

Velocity magnitude and vector distributions within the impeller

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Figure 16

Variables distributions on the circumference of R = 25 mm

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Figure 17

Calculated vorticity magnitude distributions at φ = 0.472

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Figure 18

Circumferential attack angles about inflow region

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Figure 19

Torque coefficient distributions about one blade on different circumferential positions

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Figure 20

Dimensionless velocity distributions on inner and outer circumferences about impellers

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Figure 21

Dimensionless relative velocity distributions on inner and outer circumferences about impellers

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Figure 22

Sketch of velocity triangular of impellers

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Figure 23

Velocity magnitude distributions at φ = 0.472

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Figure 24

CFD averaged results about dimensionless relative velocities and its six power law on outer (wo ) and inner (wi ) circumferences

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Figure 25

Comparisons about relative noise between experiment and prediction

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