High speed PIV measurement of impinging flow on a horizontal axis wind turbine

J. Stephen Hu, Jian Sheng, Michele Guala, Leonardo Chamorro

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The focus of this paper is to characterize the upstream wake of a three bladed Horizontal Axis Wind Turbine (HAWT) and its interaction with the native structures within a turbulent boundary layer (TBL). The overarching question is the most prevailing length and time scales of coherent structures that would interact with a HAWT and how they would be affected. The implications include wall flow and structure interaction and flow induced noise generation in large scale turbo machineries. The experiments are performed on a turbine that has a 0.128 m rotor diameter, a hub height of 0.104 m and a tip speed ratio of 4. The HAWT model is placed in a large scale wind tunnel in a boundary layer with a thickness δ of ∼0.6 m. The boundary layer is generated by a 60 mm picket fence trip and developed over a smooth wall under thermally neutral conditions. Measurements are performed under ReD of 4 × 10 5 and 6 × 105. Both turbine geometries and flow conditions are scaled from operating conditions in the field. High speed Particle Image Velocimetry (PIV), turbine voltage output, and angular velocity measurements are conducted simultaneously, by which one could relate the upwind flow structures with the power output of the turbine. High speed PIV offer details in spatial and temporal characteristics of the impinging flow structures, whilst the voltage anemometer and tachometer provide instantaneous measurement of angular velocity of the turbine. PIV measurements are taken at a rate of 1500 image pairs per second with a 100 μs delay between laser pulses. Each sample area is 0.15 × 0.15 cm. Two locations up to two rotor diameters upwind are measured. Instantaneous voltage is taken at a sampling rate of 30 kHz and a sampling time of 60s to ensure sufficient temporal resolution and coverage. Ongoing analysis using conditional averaging based on extreme power output events will provide insights in assessing a HAWT performance in unsteady flow conditions.

Original languageEnglish (US)
Title of host publicationASME 2012 Fluids Engineering Division Summer Meeting Collocated with the ASME 2012 Heat Transfer Summer Conf. and the ASME 2012 10th Int. Conf. on Nanochannels, Microchannels, and M, FEDSM 2012
Pages1515-1522
Number of pages8
EditionPARTS A AND B
DOIs
StatePublished - Dec 1 2012
Externally publishedYes
EventASME 2012 Fluids Engineering Division Summer Meeting, FEDSM 2012 Collocated with the ASME 2012 Heat Transfer Summer Conf. and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and M, FEDSM 2012 - Rio Grande, Puerto Rico
Duration: Jul 8 2012Jul 12 2012

Publication series

NameAmerican Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM
NumberPARTS A AND B
Volume1
ISSN (Print)0888-8116

Other

OtherASME 2012 Fluids Engineering Division Summer Meeting, FEDSM 2012 Collocated with the ASME 2012 Heat Transfer Summer Conf. and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and M, FEDSM 2012
CountryPuerto Rico
CityRio Grande
Period7/8/127/12/12

ASJC Scopus subject areas

  • Mechanical Engineering

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  • Cite this

    Hu, J. S., Sheng, J., Guala, M., & Chamorro, L. (2012). High speed PIV measurement of impinging flow on a horizontal axis wind turbine. In ASME 2012 Fluids Engineering Division Summer Meeting Collocated with the ASME 2012 Heat Transfer Summer Conf. and the ASME 2012 10th Int. Conf. on Nanochannels, Microchannels, and M, FEDSM 2012 (PARTS A AND B ed., pp. 1515-1522). (American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM; Vol. 1, No. PARTS A AND B). https://doi.org/10.1115/FEDSM2012-72346