Fluid–Structure Interaction for Biomimetic Design of an Innovative Lightweight Turboexpander
Abstract
:1. Introduction
Biomimetic Design of Turboexpanders
2. Numerical Simulations
2.1. CFD Simulations
2.1.1. Geometry
2.1.2. Mesh for Fluid Analysis
2.1.3. CFD Model Setup
2.2. FEA Simulations
2.2.1. Mesh for Structural Analysis
2.2.2. Turbine Composite Materials
2.2.3. Fluid–Structure Interaction Model Setup
3. Results and Discussion
3.1. Validation of the CFD Model
3.2. Static Structural Results
3.3. Blade Weight
4. Conclusions
- The fiber orientation angle has a significant effect on the deformation of the rotor blades and the minimum deflection value was observed with 30° fiber orientation which is consistent with the barb angle at the tip leading of the flight feather. A little change in the fiber orientation has a greater effect on the deformation; the deformation was increased by 219.3% by using 60° fiber orientation compared with the deflection observed at 30° fiber orientation.
- The composite rotor blades weighed 0.0237 kg instead of 0.1234 kg, which means a weight reduction of 80%, and was proven to be structurally robust. This weight reduction can contribute to increasing the turbine rotational speed, which will increase the specific work without increasing the centrifugal stresses on the turbine.
Funding
Conflicts of Interest
References
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Cases | Inlet Turbine Pressure (kPa) | Inlet Turbine Temperature (K) | Outlet Turbine Pressure (kPa) | Rotational Turbine Speed (RPM) |
---|---|---|---|---|
Air | 413.6 | 477.6 | 72.4 | 71700 |
R600a | 1872 | 370 | 395 | 40219 |
Material | Density (kg/m3) | Ex (MPa) | Ey = Ez (MPa) | Gyz (MPa) | Gxy = Gxz (MPa) | Xt (MPa) | Yt = Zt (MPa) | νxy = νxz | νyz |
---|---|---|---|---|---|---|---|---|---|
Epoxy carbon UD prepreg | 1490 | 121000 | 8600 | 3100 | 4700 | 2231 | 29 | 0.27 | 0.4 |
Stainless steel | 7750 | 193000 | 193000 | 73664 | 73664 | 207 | 207 | 0.31 | 0.31 |
Case | Mass Flow Tate (kg/s) | Total-to-Static Efficiency (%) | ||
---|---|---|---|---|
CFD | Error (%) | CFD | Error (%) | |
Jones [15] | 0.339 | 2.7 | 87.6 | 1.4 |
Case | Maximum von Mises Stress (Mpa) | Maximum Deflection on the Presure Side (mm) | Percentage of Deflection from 30° Fiber Orientation (%) |
---|---|---|---|
Stainless steel | 1277 | 0.0045 | −96.09 |
20° fiber orientation | 2486.3 | 0.1351 | 17.17 |
30° fiber orientation | 2387.9 | 0.1153 | - |
40° fiber orientation | 2327.8 | 0.1625 | 40.93 |
50° fiber orientation | 2280.6 | 0.2504 | 117.1 |
60° fiber orientation | 2238.2 | 0.3682 | 219.3 |
Case | Weight (kg) | Percentage in Reduction of Blades Weight Using Composite Material (%) |
---|---|---|
Stainless teel rotor blades | 0.1234 | - |
Composite rotor blades | 0.0237 | 80.0 |
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Gad-el-Hak, I. Fluid–Structure Interaction for Biomimetic Design of an Innovative Lightweight Turboexpander. Biomimetics 2019, 4, 27. https://doi.org/10.3390/biomimetics4010027
Gad-el-Hak I. Fluid–Structure Interaction for Biomimetic Design of an Innovative Lightweight Turboexpander. Biomimetics. 2019; 4(1):27. https://doi.org/10.3390/biomimetics4010027
Chicago/Turabian StyleGad-el-Hak, Ibrahim. 2019. "Fluid–Structure Interaction for Biomimetic Design of an Innovative Lightweight Turboexpander" Biomimetics 4, no. 1: 27. https://doi.org/10.3390/biomimetics4010027