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介绍了多普勒频谱模糊的原理和双采样单元互相关湍流测量方法,提出将横向多普勒技术与双采样单元互相关方法相结合进行无模糊湍流测量,并设计了湍流测量实验系统。理论与实验研究结果表明该方法可消除渡越时间效应、湍流和采样单元内流速梯度造成的频谱模糊。
The principle of Doppler spectral ambiguity and the method of turbulent measurement of double-sampled cross-correlation are introduced. It is proposed to combine the transverse Doppler technique with the dual sampling unit cross-correlation method to carry out no-fuzzy turbulence measurement, and a turbulence measurement experiment system is designed. The theoretical and experimental results show that this method can eliminate the time lapses, turbulences and spectral turbulence caused by the velocity gradient in the sampling unit.