Wind Turbulence Characteristics Under Typhoon Conditions

Abstract

The main purpose of this research was to study wind turbulence characteristics under typhoon conditions In order to better understand the cause of turbine damage firstly we should study the wind turbulence characteristics under typhoons such as mean wind speed and wind direction turbulence intensity turbulence integral length scale and power spectrum of wind velocity Cross-Correlation and Autocorrelation were investigated in detail based on the wind data recorded during the strong typhoon The measured results revealed that the wind characteristics in different stages during the typhoon varied remarkably with a variation Therefore considering the spectrum analysis at two different heights 50m and 86m of the typhoon the power spectrum from FFT and a Proposed von Karman model and other parameters were indicating the distribution of signal power at different frequencies and the recorded wind speed fluctuations Correlation shows that the strong coherence between wind speed and wind direction decreases with the increase in latency Spectral analysis shows significant periodicity with similar characteristics at two different heights during a typhoon Through comparison at both heights wind measurements the phenomena of enhanced levels of turbulence characteristics under typhoon boundary layer were observed The data analysis results are expected to be useful for the wind-resistant design of offshore structures and buildings on seashores in typhoon-prone regions And are very important for the assessment of wind energy resources

Date of Award	2019
Original language	English
Supervisor	Jiun-Jih Miau (Supervisor)