Effect of Two- and Three-Dimensionally Designed Guide Vanes with Different Camber Length on Static Pressure Recovery of a Wall-Mounted Axial Fan
Abstract
:1. Introduction
2. Axial Fan and Guide Vanes
2.1. Wall-Mounted Axial Fan Unit
2.2. Guide Vanes
2.3. Inlet Motor Effect
3. Numerical Setup
3.1. Computational Domain and Grid System
3.2. Governing Equation and Turbulence Model
3.3. Boundary Condition
3.4. Solver Information
4. Experimental Validation
5. Results and Discussion
5.1. Two- and Three-Dimensional Designs
5.2. Further Design
6. Conclusions
- At design and some low flow rate points, the 2D design contained the most favorable performance when the meridional length (linear) was 30% based on total length, and was the worst for 70%. Here, ‘linear’ means the vane angle of zero (0) degrees, parallel to the axis with a plate shape.
- The 3D design method applied in this study did not outperform the 2D design. In terms of mass production, it is appropriate to consider the 2D design.
- If the meridional length of a guide vane is insufficient (short), separation and recirculation can be present near the vane surface, which inhibits the static pressure recovery.
- The following solutions can be suggested to achieve better performance with a guide vane: vaneless duct exhibiting length of 0.25 from the vane outlet; and guide vanes with extended meridional length.
- In the 2D design concept, averaging the flow angle for the entire span at the design flow rate can ensure a better pressure rise over a more comprehensive flow rate range than weighting the flow angle for a specific span.
- The influence of turbulence models between the SST standard and reattachment modification did not have a significant difference in prediction near the design flow rate point.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Specification | Value | Unit |
---|---|---|
Specific speed () | 3.9 | (-) |
Flow coefficient () | 0.19 | (-) |
Pressure coefficient () | 0.24 | (-) |
Rotational speed () | 880 | (rpm) |
Hub ratio () | 0.41 | (-) |
Parameter | Value | Unit |
---|---|---|
Chord length | 192.3 (hub), 178.3 (shroud) | (mm) |
Meridional length | 138.8 (hub), 50.6 (shroud) | (mm) |
Max. thickness (airfoil) | 12.9 (hub), 9.3 (shroud) | (mm) |
Setting angle 1 | 46.2 (hub), 16.4 (shroud) | (degrees) |
No. of blades () | 10 | (-) |
Parameter | Normalized Value (Unit) 1 | Actual Value (Unit) |
---|---|---|
Meridional length (total) | 0.15 (-) | 150 (mm) |
Meridional length (linear) | 0.1, 0.3, 0.5, 0.7 (-) 2 | - |
Axial gap 3 | 0.05 (-) | 50 (mm) |
Vane thickness | 0.0045 (-) | 4.5 (mm) |
No. of vanes () | - | 11 (-) |
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Kim, Y.-I.; Choi, Y.-U.; Jeong, C.-Y.; Lee, K.-Y.; Choi, Y.-S. Effect of Two- and Three-Dimensionally Designed Guide Vanes with Different Camber Length on Static Pressure Recovery of a Wall-Mounted Axial Fan. Processes 2021, 9, 1595. https://doi.org/10.3390/pr9091595
Kim Y-I, Choi Y-U, Jeong C-Y, Lee K-Y, Choi Y-S. Effect of Two- and Three-Dimensionally Designed Guide Vanes with Different Camber Length on Static Pressure Recovery of a Wall-Mounted Axial Fan. Processes. 2021; 9(9):1595. https://doi.org/10.3390/pr9091595
Chicago/Turabian StyleKim, Yong-In, Yong-Uk Choi, Cherl-Young Jeong, Kyoung-Yong Lee, and Young-Seok Choi. 2021. "Effect of Two- and Three-Dimensionally Designed Guide Vanes with Different Camber Length on Static Pressure Recovery of a Wall-Mounted Axial Fan" Processes 9, no. 9: 1595. https://doi.org/10.3390/pr9091595