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An orifice flow meter is widely used to measure the flow rate in a pipe, where the accuracy of the measurement is acceptable when the flow is steady. It is desired that in order to develop an accurate method to measure the flow rate in a pipe under pulsating flow conditions a detailed flow pattern of the unsteady flow field should be sought. In the present paper, the velocity distributions and turbulent intensity were measured in the flow field downstream of the orifice in a pipe under pulsating flow conditions. The experimental results showed the following : velocity profiles have almost similarities in the potential core region, velocity profiles on the centerline of the pipe show hysteresis phenomena when opening area ratio of the rotary valve changes with time, and the peak of turbnlent intensity near the edge of the orifice moves downstream with time as the rotary valve opens.

A Study on Pulsating Flow through a Pipe with an Orifice (An Observation of Flow Field by Laser Doppler Velocimeter)