A Method for Improving Kaimal Spectrum and its Algorithm Implementation
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摘要: 本文发现了脉动风速方差模拟值与设定值存在着误差,分析了引起误差的原因。得到了在不同的湍流尺度与风速比值L/U的情况下,截止频率和初始频率对模拟风速方差的影响,给出了截止频率和初始频率的推荐值,并对Kaimal谱进行了修正。运用修正后的Kaimal谱及平稳随机过程方法,得到了模拟脉动风速时程数据。实例数据表明:模拟脉动风速数据的标准差符合工程应用要求,模拟功率谱与目标风谱吻合得很好。Abstract: This paper reveals that obvious errors exist between simulated variance and settled variance,and then analyzes the causes of those errors.The effects of initial frequency and cut-off frequency on the simulated variance are ascertained with different turbulent length/wind speed ratio,then the recommended initial frequency and cut-off frequency are given,and a method is developed to reduce these effects.Using the improved Kaimal spectra and stationary random method,stochastic wind data at hub height is simulated.The wind time-series show that the simulated wind velocity satisfies statistical standard deviation demand,and simulated spectra well conform to the target power spectral.
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Key words:
- wind field /
- turbulence flow /
- velocity /
- errors /
- numerical methods
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