Unsteady Flow Measurement Using Pressure Change of Compressible Fluid : 1st Report, Examination of the Proposed Method

• Published in: Transactions of the Japan Society of Mechanical Engineers Series C Vol. 64; no. 619; pp. 992 - 997
• Main Authors: SHIMIZU, Masashi, RYUMAE, Saburo, INAOKA, Hidenori, ISHIDA, Akimasa
• Format: Journal Article
• Language: Japanese
• Published: The Japan Society of Mechanical Engineers 25.03.1998
• Subjects: Heat Transfer; Measurement; Unsteady Flow
• ISSN: 0387-5024; 1884-8354
• DOI: 10.1299/kikaic.64.992

Measurement of unsteady or pulsating flowrate in hydraulic pipelines is very important. In general, an air chamber is inserted to a pipeline as an accumulator in order to reduce the pulsation of flow. In this paper, we proposed a new method for the measurement of unsteady flowrate in a pipeline using the change in pneumatic pressure and temperature in the air chamber. In this method, it was assumed that the temperature was determined by change of state and heat transfer. Because the measurement of the chamber temperature is difficult, we estimate the temperature by numerically solving the heat transfer equation. In order to evaluate the method, a simple experimental model was employed, and measured flowrate profile was compared to the estimated one. Good agreement was achieved between the measured and estimated flowrates, and then the validity of this method was demonstrated.