Experimental Investigation on Velocity Fluctuation in a Vaned Diffuser Centrifugal Pump Measured by Laser Doppler Anemometry
Abstract
:1. Introduction
2. Experimental Setup of LDA Experiment
2.1. The Investigated Model Pump with a Vaned Diffuser
2.2. LDA Setup
3. Results and Discussions
3.1. Performance of the Model Pump
3.2. Velocity Fluctuations within the Model Pump
3.3. Reconstruction of Velocity Field
4. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
Nomenclature
Qd | Rated pump capacity, m3/h |
Hd | Rated pump head, m |
nd | Rated rotating speed, r/min |
ns | Specific speed |
ΦN | Flow coefficient |
ΨN | Head coefficient |
Zr | Impeller blade number |
Zs | Diffuser blade number |
η | Efficiency |
D1 | Impeller suction diameter, mm |
D2 | Impeller exit diameter, mm |
D3 | Diffuser outlet diameter |
D4 | Volute exit diameter, mm |
b2 | Impeller exit width, mm |
b3 | Diffuser inlet width, mm |
ϕ | Wrap angle, ° |
u2 | Speed at the impeller exit, m/s |
β2 | Blade exit angle, ° |
β4 | Diffuser outlet angle, ° |
ρ | Water density, m3/h |
fn | Rotating frequency of the shaft, Hz |
fBPF | Blade passing frequency of the rotor, Hz |
v | Velocity magnitude, m/s |
v* | Non-dimensional velocity |
Mean velocity magnitude, m/s | |
RMS | Root mean square of velocity, m/s |
RMS* | Non-dimensional RMS |
LE | Leading edge |
RSI | Rotor-stator interaction |
t | Measuring time, ms |
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Parameters | Value |
---|---|
Flow rate Qd | 55 m3/h |
Head Hd | 20 m |
Rotation speed nd | 1450 r/min |
Specific speed | 69 |
Blade number Zr | 6 |
Diffuser blade number Zs | 5 |
Impeller suction diameter D1 | 80 mm |
Impeller exit diameter D2 | 250 mm |
Volute exit diameter D4 | 100 mm |
Impeller exit angle β2 | 25° |
Impeller wrap angle ϕ | 125° |
Diffuser inlet width b3 | 21 mm |
Diffuser outlet diameter D3 | 320 mm |
Diffuser outlet angle β4 | 17° |
Speed at the impeller exit u2 | 18.9 m/s |
Rotating frequency fn | 24.2 Hz |
Blade passing frequency fBPF | 145 Hz |
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Zhang, N.; Li, D.; Jiang, J.; Gao, B.; Ni, D.; Alubokin, A.A.; Zhang, W. Experimental Investigation on Velocity Fluctuation in a Vaned Diffuser Centrifugal Pump Measured by Laser Doppler Anemometry. Energies 2023, 16, 3223. https://doi.org/10.3390/en16073223
Zhang N, Li D, Jiang J, Gao B, Ni D, Alubokin AA, Zhang W. Experimental Investigation on Velocity Fluctuation in a Vaned Diffuser Centrifugal Pump Measured by Laser Doppler Anemometry. Energies. 2023; 16(7):3223. https://doi.org/10.3390/en16073223
Chicago/Turabian StyleZhang, Ning, Delin Li, Junxian Jiang, Bo Gao, Dan Ni, Anthony Akurugo Alubokin, and Wenbin Zhang. 2023. "Experimental Investigation on Velocity Fluctuation in a Vaned Diffuser Centrifugal Pump Measured by Laser Doppler Anemometry" Energies 16, no. 7: 3223. https://doi.org/10.3390/en16073223