The Role of Blade Sinusoidal Tubercle Trailing Edge in a Centrifugal Pump with Low Specific Speed
Abstract
:1. Introduction
2. Test Model Pump and Setup
2.1. Test Model Pump
2.2. Impeller Blade Trailing Edge
2.3. Experimental Setup
3. Numerical Investigation
3.1. Numerical Method
3.2. Computational Mesh
3.3. Monitoring Points Arrangement
4. Results and Analysis
4.1. Performance Analysis of Two Test Pumps
4.2. Pressure Pulsations for the Two Pumps
4.3. Flow Structures of Two Model Pumps
5. Conclusions
Author Contributions
Funding
Conflicts of Interest
Nomenclature
D1 | Impeller entrance diameter [mm] |
D2 | Impeller exit diameter [mm] |
D3 | volute base circle diameter [mm] |
Q | Nominal flow rate [m3/h] |
H | Nominal head [m] |
B1 | Impeller inlet width [mm] |
B2 | peller exit width [mm] |
N | Nominal rotating speed [rpm] |
Z | Impeller blades number |
Cp | Pressure coefficient [= (pi-)/(0.5 u22)] |
u2 | circumferential speed at the impeller exit . |
Ns | Specific speed |
ρ | Fluid density [kg/m3] |
Mean pressure coefficient | |
φ | Flow coefficient [Q/(u2R22)] |
ψ | Head coefficient [Hg/u22] |
η | Efficiency [%] |
pi | Monitoring point pressure value [Hg/u22] |
BTE | blade trailing edge |
STTE | sinusoidal tubercle trailing edge |
β1 | Blade inlet angle [°] |
β2 | Blade outlet angle [°] |
φN | Nominal flow rate coefficient |
ψN | Nominal head coefficient |
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Main Parameters | Signs | Values |
---|---|---|
Nominal rotating speed (rpm) | n | 3000 |
Nominal flow rate (m3/h) | QN | 10 |
Nominal head (m) | H | 35 |
Specific speed | Ns | 40.1 |
Impeller blades number | Z | 5 |
Impeller inlet diameter (mm) | D1 | 50 |
Impeller exit diameter (mm) | D2 | 160 |
Impeller exit width (mm) | B2 | 10 |
Impeller inlet width (mm) | B1 | 19 |
volute base circle diameter(mm) | D3 | 165 |
volute exit diameter (mm) | D4 | 40 |
Blade inlet angle | β1 | 23 |
Blade outlet angle | β2 | 23 |
Nominal flow rate coefficient | φN | 0.017 |
Nominal head coefficient | ψN | 0.622 |
Roughness in impeller passage(μm) | Ra1 | 0.4 |
Roughness in volute(μm) | Ra2 | 1.6 |
Inlet Reynolds number | Re | 70396 |
Components | Impeller | Volute | Back Chamber | Front Chamber | Inlet Extension | Outlet Extension |
---|---|---|---|---|---|---|
Number | 7,636,570 | 932,106 | 391,136 | 390,150 | 365,792 | 228,096 |
Monitoring Points | Cp of OTE Profile | Cp of STTE Profile | Reduction (%) |
---|---|---|---|
T1 | 0.0316 | 0.028 | 10.4 |
T2 | 0.0281 | 0.0266 | 5.3 |
T3 | 0.081 | 0.0745 | 8.2 |
T4 | 0.0577 | 0.0558 | 3.3 |
T5 | 0.065 | 0.0623 | 5.5 |
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Li, B.; Li, X.; Jia, X.; Chen, F.; Fang, H. The Role of Blade Sinusoidal Tubercle Trailing Edge in a Centrifugal Pump with Low Specific Speed. Processes 2019, 7, 625. https://doi.org/10.3390/pr7090625
Li B, Li X, Jia X, Chen F, Fang H. The Role of Blade Sinusoidal Tubercle Trailing Edge in a Centrifugal Pump with Low Specific Speed. Processes. 2019; 7(9):625. https://doi.org/10.3390/pr7090625
Chicago/Turabian StyleLi, Bowen, Xiaojun Li, Xiaoqi Jia, Feng Chen, and Hua Fang. 2019. "The Role of Blade Sinusoidal Tubercle Trailing Edge in a Centrifugal Pump with Low Specific Speed" Processes 7, no. 9: 625. https://doi.org/10.3390/pr7090625