A THREE-DIMENSIONAL MEASUREMENT TECHNIQUE FOR TURBULENT FLOWS

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Abstract
An experimental technique is presented which will help resolve the nature of bulk motions occurring in turbulent flow. The technique is based upon photogrammetric analysis of stereoscopic motion pictures of the flow Held containing small neutrally buoyant tracer particles. The resulting data essentially consist of discrete sets of three-dimensional particle paths which characterize the bulk motions. The data obtained from the particle paths can also provide such information as point velocity measurements, velocity profiles and estimates of fluid accelerations. Furthermore the technique provides this information at a number of locations simultaneously and with time. In this work, the technique has been specifically applied to the study of flow phenomena occurring in an agitated tank.

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