The Impact of Volute Aspect Ratio on the Performance of a Mixed Flow Turbine
Abstract
:1. Introduction
2. Turbine Design
3. Computational Approach
Computational Validation
4. Results and Discussion
4.1. Impact of Volute Ascpect Ratio on MFP
4.2. Aspect Ratio Effect with Constant MFP
4.3. Secondary Flow Structures
5. Conclusions
Acknowledgments
Author Contributions
Conflicts of Interest
Nomenclature
AR | Aspect Ratio |
A/r | Area Radius Ratio |
Dean Number | |
Absolute Velocity | |
CFD | Computational Fluid Dynamics |
d | Diameter |
LE | Leading Edge |
LES | Large Eddy Simulation |
MFP | Mass Flow Parameter |
Mass Flow | |
Mass Flow Pulsation Number | |
PR | Pressure Ratio |
PS | Pressure Surface |
Radius of Curvature | |
Reynolds Number Based on Diameter | |
SAS | Scaled Adaptive Simulation |
SST | Shear Stress Transport |
SS | Suction Surface |
TE | Trailing Edge |
Bulk Pipe Velocity | |
Blade Speed | |
Velocity Ratio | |
URANS | Unsteady Reynolds Averaged Navier Stokes |
Relative Velocity | |
Greek Letters | |
Relative Flow Angle | |
Blade Angle | |
Flow Cone Angle | |
Blade Cone Angle | |
Blade Camber Angle | |
Density | |
Dynamic Viscosity | |
Subscripts | |
T-T | Total to Total Pressure |
T-s | Total to Static Pressure |
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Frequency | Aspect Ratio | 0.5 | 1 | 2 |
---|---|---|---|---|
20 Hz | Eff Min U/cs | 99.02% | 99.94% | 100.00% |
Eff Max U/cs | 92.41% | 96.48% | 100.00% | |
Cycle AVG Rotor Eff | 98.96% | 99.75% | 100.00% | |
Cycle AVG Stage Eff | 98.53% | 99.57% | 100.00% | |
Volute Pt Loss Coefficient | 0.1231 | 0.1064 | 0.1061 | |
40 Hz | Eff Min U/cs | 99.12% | 100.00% | 99.99% |
Eff Max U/cs | 93.85% | 97.96% | 100.00% | |
Cycle AVG Rotor Eff | 99.00% | 99.77% | 100.00% | |
Cycle AVG Stage Eff | 98.59% | 99.61% | 100.00% | |
Volute Pt Loss Coefficient | 0.1221 | 0.1056 | 0.1057 | |
60 Hz | Eff Min U/cs | 98.83% | 99.71% | 100.00% |
Eff Max U/cs | 97.04% | 99.38% | 100.00% | |
Cycle AVG Rotor Eff | 99.01% | 99.73% | 100.00% | |
Cycle AVG Stage Eff | 98.60% | 99.59% | 100.00% | |
Volute Pt Loss Coefficient | 0.1195 | 0.1032 | 0.1035 |
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Lee, S.P.; Barrans, S.M.; Jupp, M.L.; Nickson, A.K. The Impact of Volute Aspect Ratio on the Performance of a Mixed Flow Turbine. Aerospace 2017, 4, 56. https://doi.org/10.3390/aerospace4040056
Lee SP, Barrans SM, Jupp ML, Nickson AK. The Impact of Volute Aspect Ratio on the Performance of a Mixed Flow Turbine. Aerospace. 2017; 4(4):56. https://doi.org/10.3390/aerospace4040056
Chicago/Turabian StyleLee, Samuel P., Simon M. Barrans, Martyn L. Jupp, and Ambrose K. Nickson. 2017. "The Impact of Volute Aspect Ratio on the Performance of a Mixed Flow Turbine" Aerospace 4, no. 4: 56. https://doi.org/10.3390/aerospace4040056