Meandering of turbine wake flow induced by atmospheric eddies

Xuerui Mao*, Daniel Cabezon, Bofu Wang

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review

Abstract

A novel algorithm is developed to calculate the nonlinear optimal boundary perturbations in three-dimensional incompressible flow. An optimal step length in the optimisation loop is calculated without any extra calls of the governing PDEs. This algorithm is further applied to compute the optimal inflow eddies that induce wake oscillations in flow around a turbine blade, which is modelled as an actuator disc. Over the parameters considered, the most energetic inflow perturbation occurs at frequency ω = 1 ∼ 2 and is mainly in the form of an azimuthal Fourier wave with wavenumber 1. The development of the inflow perturbation induces significant oscillations of the wake flow. At 10 turbine radii downstream of the disc, the centre velocity oscillates at a magnitude over half of the free-stream velocity, when the maximum inflow noise is 6% of the free-stream wind speed.

Original languageEnglish
Publication statusPublished - 2019
Externally publishedYes
Event16th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery, ISROMAC 2016 - Honolulu, United States
Duration: 10 Apr 201615 Apr 2016

Conference

Conference16th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery, ISROMAC 2016
Country/TerritoryUnited States
CityHonolulu
Period10/04/1615/04/16

Keywords

  • Atmospheric eddy
  • Optimal boundary perturbation
  • Wake meandering

Fingerprint

Dive into the research topics of 'Meandering of turbine wake flow induced by atmospheric eddies'. Together they form a unique fingerprint.

Cite this

Mao, X., Cabezon, D., & Wang, B. (2019). Meandering of turbine wake flow induced by atmospheric eddies. Paper presented at 16th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery, ISROMAC 2016, Honolulu, United States.