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Optimal Design of a Ljungström Turbine for ORC Power Plants: From a 2D model to a 3D CFD Validation
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| Zeitschriftentitel: | International Journal of Turbomachinery, Propulsion and Power |
|---|---|
| Personen und Körperschaften: | , |
| In: | International Journal of Turbomachinery, Propulsion and Power, 5, 2020, 3, S. 19 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
MDPI AG
|
| Schlagwörter: |
| author_facet |
Coronetta, Umberto Sciubba, Enrico Coronetta, Umberto Sciubba, Enrico |
|---|---|
| author |
Coronetta, Umberto Sciubba, Enrico |
| spellingShingle |
Coronetta, Umberto Sciubba, Enrico International Journal of Turbomachinery, Propulsion and Power Optimal Design of a Ljungström Turbine for ORC Power Plants: From a 2D model to a 3D CFD Validation Mechanical Engineering Energy Engineering and Power Technology Aerospace Engineering |
| author_sort |
coronetta, umberto |
| spelling |
Coronetta, Umberto Sciubba, Enrico 2504-186X MDPI AG Mechanical Engineering Energy Engineering and Power Technology Aerospace Engineering http://dx.doi.org/10.3390/ijtpp5030019 <jats:p>In the last few years, waste-energy recovery systems based on the Organic Rankine Cycle (ORC) have gained increased attention in the global energy market as a versatile and sustainable technology for thermo-electric energy conversion from low-to-medium temperature sources, up to 350 °C. For a long time, water has been the only working fluid commercially adopted in powerplants: axial and, for smaller machines, radial inflow turbines have been the preferred expanders since their gulp capacity matches the ρ-T curve of water steam. The density of most organic compounds displays extremely large variations during the expansion (and the volume flow rate correspondingly increases along the machine channels), so that Radial Outflow Turbines (ROTs) have been recently considered instead of traditional solutions. This work proposes a two-dimensional inviscid model for the stage optimization of a counter-rotating ROT, known as the Ljungström turbine. The study starts by considering five different working fluids that satisfy both the gulp requirements of the turbine and the hot source characteristics. On the basis of a limited number of geometric assumptions and for a fixed set of operating conditions, different kinematic parameters are optimized to obtain the most efficient cascade configuration. Moreover, as shown in the conclusions, the most efficient blade profile leads to higher friction losses, making further investigation regarding the best configuration necessary.</jats:p> Optimal Design of a Ljungström Turbine for ORC Power Plants: From a 2D model to a 3D CFD Validation International Journal of Turbomachinery, Propulsion and Power |
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| title |
Optimal Design of a Ljungström Turbine for ORC Power Plants: From a 2D model to a 3D CFD Validation |
| title_unstemmed |
Optimal Design of a Ljungström Turbine for ORC Power Plants: From a 2D model to a 3D CFD Validation |
| title_full |
Optimal Design of a Ljungström Turbine for ORC Power Plants: From a 2D model to a 3D CFD Validation |
| title_fullStr |
Optimal Design of a Ljungström Turbine for ORC Power Plants: From a 2D model to a 3D CFD Validation |
| title_full_unstemmed |
Optimal Design of a Ljungström Turbine for ORC Power Plants: From a 2D model to a 3D CFD Validation |
| title_short |
Optimal Design of a Ljungström Turbine for ORC Power Plants: From a 2D model to a 3D CFD Validation |
| title_sort |
optimal design of a ljungström turbine for orc power plants: from a 2d model to a 3d cfd validation |
| topic |
Mechanical Engineering Energy Engineering and Power Technology Aerospace Engineering |
| url |
http://dx.doi.org/10.3390/ijtpp5030019 |
| publishDate |
2020 |
| physical |
19 |
| description |
<jats:p>In the last few years, waste-energy recovery systems based on the Organic Rankine Cycle (ORC) have gained increased attention in the global energy market as a versatile and sustainable technology for thermo-electric energy conversion from low-to-medium temperature sources, up to 350 °C. For a long time, water has been the only working fluid commercially adopted in powerplants: axial and, for smaller machines, radial inflow turbines have been the preferred expanders since their gulp capacity matches the ρ-T curve of water steam. The density of most organic compounds displays extremely large variations during the expansion (and the volume flow rate correspondingly increases along the machine channels), so that Radial Outflow Turbines (ROTs) have been recently considered instead of traditional solutions. This work proposes a two-dimensional inviscid model for the stage optimization of a counter-rotating ROT, known as the Ljungström turbine. The study starts by considering five different working fluids that satisfy both the gulp requirements of the turbine and the hot source characteristics. On the basis of a limited number of geometric assumptions and for a fixed set of operating conditions, different kinematic parameters are optimized to obtain the most efficient cascade configuration. Moreover, as shown in the conclusions, the most efficient blade profile leads to higher friction losses, making further investigation regarding the best configuration necessary.</jats:p> |
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| author | Coronetta, Umberto, Sciubba, Enrico |
| author_facet | Coronetta, Umberto, Sciubba, Enrico, Coronetta, Umberto, Sciubba, Enrico |
| author_sort | coronetta, umberto |
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| description | <jats:p>In the last few years, waste-energy recovery systems based on the Organic Rankine Cycle (ORC) have gained increased attention in the global energy market as a versatile and sustainable technology for thermo-electric energy conversion from low-to-medium temperature sources, up to 350 °C. For a long time, water has been the only working fluid commercially adopted in powerplants: axial and, for smaller machines, radial inflow turbines have been the preferred expanders since their gulp capacity matches the ρ-T curve of water steam. The density of most organic compounds displays extremely large variations during the expansion (and the volume flow rate correspondingly increases along the machine channels), so that Radial Outflow Turbines (ROTs) have been recently considered instead of traditional solutions. This work proposes a two-dimensional inviscid model for the stage optimization of a counter-rotating ROT, known as the Ljungström turbine. The study starts by considering five different working fluids that satisfy both the gulp requirements of the turbine and the hot source characteristics. On the basis of a limited number of geometric assumptions and for a fixed set of operating conditions, different kinematic parameters are optimized to obtain the most efficient cascade configuration. Moreover, as shown in the conclusions, the most efficient blade profile leads to higher friction losses, making further investigation regarding the best configuration necessary.</jats:p> |
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| spelling | Coronetta, Umberto Sciubba, Enrico 2504-186X MDPI AG Mechanical Engineering Energy Engineering and Power Technology Aerospace Engineering http://dx.doi.org/10.3390/ijtpp5030019 <jats:p>In the last few years, waste-energy recovery systems based on the Organic Rankine Cycle (ORC) have gained increased attention in the global energy market as a versatile and sustainable technology for thermo-electric energy conversion from low-to-medium temperature sources, up to 350 °C. For a long time, water has been the only working fluid commercially adopted in powerplants: axial and, for smaller machines, radial inflow turbines have been the preferred expanders since their gulp capacity matches the ρ-T curve of water steam. The density of most organic compounds displays extremely large variations during the expansion (and the volume flow rate correspondingly increases along the machine channels), so that Radial Outflow Turbines (ROTs) have been recently considered instead of traditional solutions. This work proposes a two-dimensional inviscid model for the stage optimization of a counter-rotating ROT, known as the Ljungström turbine. The study starts by considering five different working fluids that satisfy both the gulp requirements of the turbine and the hot source characteristics. On the basis of a limited number of geometric assumptions and for a fixed set of operating conditions, different kinematic parameters are optimized to obtain the most efficient cascade configuration. Moreover, as shown in the conclusions, the most efficient blade profile leads to higher friction losses, making further investigation regarding the best configuration necessary.</jats:p> Optimal Design of a Ljungström Turbine for ORC Power Plants: From a 2D model to a 3D CFD Validation International Journal of Turbomachinery, Propulsion and Power |
| spellingShingle | Coronetta, Umberto, Sciubba, Enrico, International Journal of Turbomachinery, Propulsion and Power, Optimal Design of a Ljungström Turbine for ORC Power Plants: From a 2D model to a 3D CFD Validation, Mechanical Engineering, Energy Engineering and Power Technology, Aerospace Engineering |
| title | Optimal Design of a Ljungström Turbine for ORC Power Plants: From a 2D model to a 3D CFD Validation |
| title_full | Optimal Design of a Ljungström Turbine for ORC Power Plants: From a 2D model to a 3D CFD Validation |
| title_fullStr | Optimal Design of a Ljungström Turbine for ORC Power Plants: From a 2D model to a 3D CFD Validation |
| title_full_unstemmed | Optimal Design of a Ljungström Turbine for ORC Power Plants: From a 2D model to a 3D CFD Validation |
| title_short | Optimal Design of a Ljungström Turbine for ORC Power Plants: From a 2D model to a 3D CFD Validation |
| title_sort | optimal design of a ljungström turbine for orc power plants: from a 2d model to a 3d cfd validation |
| title_unstemmed | Optimal Design of a Ljungström Turbine for ORC Power Plants: From a 2D model to a 3D CFD Validation |
| topic | Mechanical Engineering, Energy Engineering and Power Technology, Aerospace Engineering |
| url | http://dx.doi.org/10.3390/ijtpp5030019 |