Numerical Investigation of Compression and Expansion Process of Twin-Screw Machine Using R-134a
Abstract
:1. Introduction
2. Geometric Modeling and Meshing
3. Simulation Settings
3.1. Governing Equations and Boundary Conditions
3.2. Meshing of the Fluid Domains
3.3. Grid Independence Verification
4. Simulation Results
4.1. Twin-Screw Compressor
4.2. Twin-Screw Expander
5. Conclusions
- The wrap angle influenced the distribution of the sealing lines and altered the leakage flow, which affected the delivery rate and volumetric efficiency by up to 2%.
- The leakage flow could be determined from the predicted flow distribution, and the highest velocity was above 100 m·s−1 during the compression process as a result of the small gap clearance.
- The isentropic efficiency was not sensitive to the change in the wrap angle, and the difference was within 1%.
- An increase in the pressure ratio led to a decrease in the mass flow rate and volumetric efficiency because of the higher leakage flow rate. However, its influence on the isentropic efficiency was also unnoticeable.
- This screw expander was operated in underexpanded conditions, and the pressure contours demonstrated a minimum pressure level below the outlet pressure. Higher volumetric and isentropic efficiencies could be achieved if the expander was operated at a ratio that was close to the built-in expansion ratio.
Author Contributions
Funding
Conflicts of Interest
Nomenclature
Specific heat capacity | |
K | Thermal conductivity |
P | Pressure |
R | Gas constant |
Internal heat source and the viscous dissipation term | |
T | Temperature |
u, v, w | Velocity |
μ | Viscosity |
ρ | Density |
τ | Component of the viscous stress |
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Parameters | Value |
---|---|
Lobe combination | 5/6 |
Rotor length (mm) | 167 |
Inlet angle (°) | 280.52 |
Outlet angle (°) | 60.48 |
Male rotor head diameter (mm) | 138.54 |
Female rotor head diameter (mm) | 109.86 |
Center distance (mm) | 98 |
Wrap angle (male rotor) (°) | 280, 290, 300 |
Parameters | Value | |
---|---|---|
Compressor (R134a) | Wrap angle (degree) | 280, 290, 300 |
Inlet pressure (bar) | 2.55 | |
Inlet temperature (K) | 288.47 | |
Discharge pressure (bar) | 8.05, 10.24 | |
Discharge temperature (K) | 328.98, 337.45 | |
Rotational speed (rpm) | 3600 | |
Expander (R134a) | Inlet pressure (bar) | 3 |
Inlet temperature (K) | 350.15 | |
Discharge pressure (bar) | 1 | |
Discharge temperature (K) | 311.03 | |
Rotational speed (rpm) | 3600 |
Wrap Angle | Flow Rate (kg·s−1) | Power (kW) | Volumetric Efficiency (%) | Isentropic Efficiency (%) |
---|---|---|---|---|
280° | 0.742 | 35.6 | 74.5 | 54.6 |
290° | 0.732 | 35.2 | 73.85 | 54.5 |
300° | 0.719 | 34.83 | 72.9 | 54.1 |
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Tsao, C.-C.; Lin, W.-K.; Lai, K.-Y.; Yavuzkurt, S.; Liu, Y.-H. Numerical Investigation of Compression and Expansion Process of Twin-Screw Machine Using R-134a. Energies 2023, 16, 3599. https://doi.org/10.3390/en16083599
Tsao C-C, Lin W-K, Lai K-Y, Yavuzkurt S, Liu Y-H. Numerical Investigation of Compression and Expansion Process of Twin-Screw Machine Using R-134a. Energies. 2023; 16(8):3599. https://doi.org/10.3390/en16083599
Chicago/Turabian StyleTsao, Chia-Cheng, Wen-Kai Lin, Kai-Yuan Lai, Savas Yavuzkurt, and Yao-Hsien Liu. 2023. "Numerical Investigation of Compression and Expansion Process of Twin-Screw Machine Using R-134a" Energies 16, no. 8: 3599. https://doi.org/10.3390/en16083599
APA StyleTsao, C.-C., Lin, W.-K., Lai, K.-Y., Yavuzkurt, S., & Liu, Y.-H. (2023). Numerical Investigation of Compression and Expansion Process of Twin-Screw Machine Using R-134a. Energies, 16(8), 3599. https://doi.org/10.3390/en16083599