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METHOD FOR CONVERTING A MEASUREMENT OF LOCAL VELOCITY OF A FLUID IN A CHANNEL OR A DUCT INTO A MEAN VELOCITY
METHOD FOR CONVERTING A MEASUREMENT OF LOCAL VELOCITY OF A FLUID IN A CHANNEL OR A DUCT INTO A MEAN VELOCITY
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机译:将通道或管道中流体的局部速度的测量转换为平均速度的方法
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摘要
A method calculates mean speed of a fluid flowing in an open channel or a partially filled duct. Fluid having a free surface of width L1 extending between walls of the channel or duct includes local speed measurements at the surface of the fluid over a zone of width L2, the set of local measurements generating a spectrum of discrete data expressed in a temporal domain. The spectrum of discrete data is converted into a spectrum of data expressed in a frequency domain via a Fourier transform. A Gaussian curve is fitted to the spectrum and the mean μ and the standard deviation σ of the Gaussian curve are calculated. L2 and σ enable calculating the distribution of speeds over L2. The ratio L2/L1 is calculated and the mean speed of the fluid within the channel or duct is determined based on the Gaussian curve and the ratio L2/L1. 展开▼
机译:一种方法计算在明渠或部分填充的管道中流动的流体的平均速度。具有在通道或导管的壁之间延伸的宽度L 1 B>的自由表面的流体包括在宽度L 2的区域上流体表面的局部速度测量, B>一组本地测量值,生成在时域中表达的离散数据频谱。离散数据的频谱通过傅立叶变换转换为在频域中表示的数据频谱。将高斯曲线拟合到频谱,并计算出高斯曲线的平均值μ和标准偏差σ。 L 2 B>和σ可以计算L 2上的速度分布。 B>比值L 2 / B> L 1 B>为计算并根据高斯曲线和比率L 2 / B> L 1确定通道或管道内流体的平均速度。 B>
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