A Direct Measurement of the Most Probable Preferred Angular Velocity of Turbulent Structures by Optical Correlation of Laser Schlieren Signals PDF Download

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A Direct Measurement of the Most Probable Preferred Angular Velocity of Turbulent Structures by Optical Correlation of Laser Schlieren Signals

Author: B. H. Funk
Publisher:
ISBN:
Category : Rotational motion
Languages : en
Pages : 36

Book Description
This report presents a method which potentially provides the means for separating the translational and rotational motion of turbulent structures. Simple two-dimensional models are used to relate the skewness of cross-correlograms computed from laser schlieren signals to the rotation of flow disturbances. The method, referred to herein as the method of "forced similarity, " is discussed with respect to application to the turbulent free shear layer of an axisymmetric supersonic jet. Experimental results show that the shape of the cross-correlogram in the neighborhooc of the "peak" is strongly influenced by rotational motion, and, therefore, it becomes necessary to account for the effect to determine the correct statistical properties of the turbulence.