Authors
1 Department of Mechanical Engineering, Shahrood University of Technology, Shahrood, Iran
2 Department of Mechanical Engineering of Biosystems, Shahrood University of Technology, Shahrood, Iran
Abstract
In this paper, the effect of stall delay on distribution of normal forces in different sections of rotor are studied by an enhanced version of the blade element momentum theory (BEM), based on the 3D correction Chaviaropoulos and Hansen mode. This model is computed at wind speed of 24m/s under the yaw angle 15◦. It is found that the BEM calculation on the outer (the radial distance more than 35% spanwies) spanwise is more trustable than inner spanwise. At 60, 82 and 92% spans, the 3D correction does not affect the output result and stall does not occur. Relative velocity rose dramatically at 25 and 35% spans, consequently angle of attack increased too particularly between azimuth angles from 270◦ up to 90◦. In this regions, stall phenomena are happened. Also it is found that the 3D correction has the maximum effect on 35 and 25% spans. The maximum improvement is 99.57% at 35% section and the azimuth angle 121◦.
Keywords
- Khanjari, A., Sarreshtehdari, A. & Mahmoodi, E.2016. Modeling of Energy and Exergy Efficiencies of a Wind Turbine Based on the Blade Element Momentum Theory Under Different Roughness Intensities. J. Energy Resour. Technol. 139, 022006.
- Mahmoodi, E. & Schaffarczyk, A. P. 2014. in 29–34 (Springer Berlin Heidelberg, 2014).
- Martinez, J., Bernabini, L., Probst, O. & Rodriguez, C. 2005. An improved BEM model for the power curve prediction of stall‐regulated wind turbines. Wind Energy.
- Vaz, J., Pinho, J. & Mesquita, A. 2011. An extension of BEM method applied to horizontal-axis wind turbine design. Renew. Energy (2011).
- Yang, H., Shen, W., Xu, H., Hong, Z. & Liu, C.2014. Prediction of the wind turbine performance by using BEM with airfoil data extracted from CFD. Renew. Energy 70, 107–115.
- Mahmoodi, E., Jafari, A. & Keyhani, A. 2015. Wind Turbine Rotor Simulation via CTO Based Actuator Disc Technique Compared to Detailed Measurement. Int. J. Renew. Energy Dev. 4, 205–210.
- Lanzafame, R., and M. M. 2012. How to take into account the radial flow inside of a 1-D numerical code. Renew. Energy 39 (1), 440–446 .
- Mahmoodi, E., Jafari, A., Peter Schaffarczyk, A., Keyhani, A. & Mahmoudi, J. 2013. A new correlation on the MEXICO experiment using a 3D enhanced blade element momentum technique. Int. J. Sustain. Energy 1–13
- Li, Q., Kamada, Y., Maeda, T., Murata, J. & Yusuke, N.2016. Effect of turbulence on power performance of a Horizontal Axis Wind Turbine in yawed and no-yawed flow conditions. Energy 109, 703–711.
- Bouatem, A. & Mers, A. Al. 2013. Validation of Chaviaro Poulos and Hansen Stall Delay Model in the Case of Horizontal Axis Wind Turbine Operating in Yaw Conditions. Energy Power Eng. 05, 18–25.
- Schepers, J. & Snel, H. 2007. Model experiments in controlled conditions. ECN Rep. ECN-E-07-042. at
- Schepers, J., Boorsma, K. & Snel, H. 2010. IEA Task 29 Mexnext: Analysis of wind tunnel measurements from the EU project Mexico. 3rd Torque 2010 Sci. Mak. Torque … 169–178 .
- Sørensen, J. 2011. Aerodynamic aspects of wind energy conversion. Annu. Rev. Fluid Mech. 427–448. 14. Glauert, H. Airplane propellers. Aerodyn. theory (1935).
- Hansen, A. & Butterfield, C. 1993. Aerodynamics of horizontal-axis wind turbines. Annu. Rev. Fluid Mech. 115–149.
- Rankine, W. 1865. On the mechanical principles of the action of propellers. 13–39.
- Froude, W. 1878. On the elementary relation between pitch, slip and propulsive efficiency. 47–57
- Froude, R. 1889. On the part played in propulsion by differences of fluid pressure. Trans. Inst. Nav. Archit. 390
- Hernandez, J. & Crespo, A. 1987. Aerodynamics calculation of the performance of horizontal axis wind turbines and comparison with experimental results. Wind Eng 177–187
- Moriarty, P. & Hansen, A. 2005. AeroDyn theory manual. at
- Wilson, R. 2009.Wind Turbine Aerodynamics Part A: Basic Principles. … Wind Turbine Eng. Second ….
- Martinez, J., Bernabini, L., Probst, O. & Rodriguez, C. 2005. An improved BEM model for the power curve prediction of stall‐regulated wind turbines. Wind Energy 385–402.
- Snel, H., Houwink, R. & Bosschers, J. 1993. Sectional prediction of 3-D effects for stalled flow on rotating blades and comparison with measurements. 395–399.
- P. K. Chaviaropoulos, Dr., 2000. Head of the Research and Development Department and M. O. L. Hansen, D. Investigating three-dimensional and rotational effects on wind turbine blades by means of a quasi-3D Navier-Stokes solver. J. Fluids Eng. 122.
- Breton, S. 2008. Study of the stall delay phenomenon and of wind turbine blade dynamics using numerical approaches and NREL’s wind tunnel tests. Dr. theses NTNU
- Schepers, J. G. et al. 2012. Final report of IEA Task 29, Mexnext (Phase 1): Analysis of Mexico wind tunnel measurements. 312.
- Schepers, J. 1998. An engineering model for yawed conditions, developed on the basis of wind tunnel measurements.
- Micallef, D., Van Bussel, G., Ferreira, C. S. & Sant, T. 2013. An investigation of radial velocities for a horizontal axis wind turbine in axial and yawed flows. Wind Energy 16.
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