Unsteady flow meter

Details Unsteady flow meter Unsteady flow meter

G - Physics

01

F

G01F 1/36 (2006.01) G01F 1/88 (2006.01)

Patent

CA 2556307

The invention makes it possible to measure, in real time, the flow of a fluid that is incompressible while having an unsteady flow. The pressure measuring system is primarily comprised of a negative-pressure element (1) placed within the flow and provided with two wall pressure taps (A, B). A means (2) for measuring a pressure difference connected to the pressure taps (A, B) enables the following formula to be solved: dq(t)/dt + .alpha.(q(t)) = .beta. x .DELTA.p(t) directly stemming from fundamental equations of fluid mechanics and/or: .DELTA.p(t) represents the pressure difference measured by the sensor; q(t) represents the sought volume flow rate, and; .alpha. represents a function of the geometry of the negative-pressure element, of the fluid and of the flow q(t), the particularity of this formula being the consideration of the direction of flow in the second term of the left member of the formula.

L~invention permet de mesurer en temps réel le débit d~un fluide incompressible en écoulement instationnaire. Le système de mesure de pression se compose principalement d~un organe déprimogène (1) placé dans l~écoulement et muni de deux prises de pression en paroi (A, B). Un moyen (2) de mesure d~une différence de pression raccordé aux prises de pression (A, B), permet de résoudre la formule : dq(t/dt + .alpha.(q(t)) = .beta. x .DELTA.p(t) provenant directement des équations fondamentales de la mécanique des fluides, et où .DELTA.p(t) représente la différence de pression mesurée par le capteur, 1q(t) le débit volumique recherché et .alpha. une fonction de la géométrie de l~organe déprimogène, du fluide et du débit q(t). La particularité de cette formule étant la prise en compte du sens de l~écoulement dans le deuxième terme du membre de gauche de la formule.

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