Feature analysis of blade strain variation with crosswind angle

PDF(2107 KB)

Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (1) : 114-119.

MA Jianlong1,2, LI Peilin1, LU Wenchun1,3, BAI Yefei1,2, ZHANG Yanqi1, WANG Jianwen1,2#br# 

Author information +

History +

Abstract

The simultaneous monitoring system of blade surface strains and vibration accelerations of a generator, its tower and base was constructed by using a TST5925 device and a PULSE19 device. The strain values at the blade root and the pneumatic centerline of a 1.4 m diameter horizontal axis wind turbine were measured and analyzed under crosswind conditions. The results showed that there is the worst crosswind angle, at this angle the blades withstand the strongest crosswind exciting force and the centrifugal force is the primary cause leading to blades shift; the worst crosswind angles corresponding to different blade positions are not the same under fixed wind speed and blade rotating speed; at lower rotating speeds, the worst crosswind angles near the blade root are often smaller than those at the tip and middle of the blade, but their responding speeds variations with the centrifugal force are more sensitive than those at other locations; strain value changings with blade rotating speed are approximately linear while for away from the worst crosswind angles, the impact of the crosswind exciting force on the blade strain significantly increases and causes a strong pulsation of strain values while close to the worst crosswind angles.

Key words

blade strain / crosswind angle / simultaneous monitor / worst crosswind angle / crosswind exciting force

Cite this article

EndNote

Ris (Procite)

Bibtex

Download Citations

MA Jianlong1,2, LI Peilin1, LU Wenchun1,3, BAI Yefei1,2, ZHANG Yanqi1, WANG Jianwen1,2. Feature analysis of blade strain variation with crosswind angle[J]. Journal of Vibration and Shock, 2017, 36(1): 114-119

References

[1] Malcolm D J. Response of stall-controlled, teetered, gree-yaw downwind turbines[J]. Wind Energy, 1999, 2: 79-98.
[2] Stubkier S, Pedersen H C. Design, optimization and analysis of hydraulic soft yaw system for 5 MW wind turbine[J]. Wind Engineering, 2011, 35(5): 529-550.
[3] Watanabe F, Takahashi T, Tokuyama, H, et al. Modelling passive yawing motion of horizontal axis small wind turbine: derivation of new simplified equation for maximum yaw rate[J]. Wind Engineering, 2012, 36(4):433-442.
[4] Schreck S, Robinson M, Hand M, et al. HAWT dynamic stall response asymmetries under yawed flow conditions[J]. Wind Energy, 2000, 3: 215-232.
[5] Micallef D, Van Bussel G, Ferreira C S, et al. An investigation of radial velocities for a horizontal axis wind turbine in axial and yawed flows[J]. Wind Energy, 2013, 16(4): 529-544.
[6] Velazquez A, Swartz R A. Gyroscopic effects of horizontal axis wind turbines using stochastic aeroelasticity via spinning finite elements[C]. ASME 2012 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, 2012, 1: 823-831
[7] Velazquez A, Swartz R A. Damped gyroscopic effects and axial-flexural-torsional coupling using spinning finite elements for wind-turbine blades characterization[J]. Proceedings of SPIE - the International Society for Optical Engineering, 2013, 8692.
[8] Bassett K, Carriveau R, Ting D S K. Vibration response of a 2.3 MW wind turbine to yaw motion and shut down events[J]. Wind Energy, 2011, 14(8):939-952.
[9] Narayana M, Putrus G A, Leung P S, et al. Development of a model to investigate the yaw behaviour of small horizontal axis wind turbines[J]. Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 2012, 226(1): 86-97.
[10] Gharali K, Johnson D A. Effects of nonuniform incident velocity on a dynamic wind turbine airfoil[J]. Wind Energy, 2014, 18(2): 237-251.
[11] 柯世堂，王同光．偏航状态下风力机塔架－叶片耦合结构气弹响应分析[J]．振动与冲击，2015，34(18)：33-38
KE Shi-tang, WANG Tong-guang. Aero-elastic vibration analysis based on a tower-blade coupled model of wind turbine in yaw condition [J]. Journal of Vibration and Shock, 2015, 34(18): 33-38.
[12] 杨军，秦大同．偏侧风对风力机气动性能的影响[J]．太阳能学报，2011，32(4):537-542
YANG Jun, QIN Da-tong. Influence of side wind on aerodynamic performance of wind turbine[J]. Acta Energiae Solaris Sinica, 2011, 32(4): 537-542.
[13] 查顾兵，竺晓程，沈昕，等．水平轴风力机在偏航情况下动态失速模型分析[J]．太阳能学报，2009，30(9):1297-1300
CHA Gu-bing, ZHU Xiao-cheng, SHEN Xin, et al. Dynamic stall modelling of horizontal axis wind turbine in yaw condition[J]. Acta Energiae Solaris Sinica, 2009, 30(9): 1297-1300.