Real Time Measurement for High Frequency Pulsating Flow Rate in a Pipe

Two kinds of analog transformation methods for the measurement of high frequency pulsating flow rates in pipe flow are investigated. By use of the methods, the high frequency pulsating flow rates can be obtained by feeding differential pressure or centerline velocity to analog electronic circuits. First, the frequency characteristics of the electronic circuits for the measurement are examined by experiments. Then a criterion for determining the measurement distance of the differential pressure is derived analytically in order to ensure the required accuracy of the measurement when the flow rate is obtained from the differential pressure signal. Both methods are experimented with over a wide range of frequency. The results show that both methods are not only simple and practical, but also very accurate for the measurement of high frequency pulsating flow rates.