A pressure signal flow measurement device and flow measurement method

Abstract

The invention discloses a pressure signal flow measurement device and a flow measurement method for improving the precision. The pressure signal flow measurement device comprises an experimental water tank, a liquid-gas conversion pressure measurement cylinder, a fluid pressure difference sensor and a microcomputer, wherein the experimental water tank is provided with an outflow port, and a water stabilizing pore plate used for dividing a water inlet working area into an water inlet area and a water stabilizing working area is arranged in the experimental water tank; the liquid-gas conversion pressure measurement cylinder is arranged in the water stabilizing working area of the experimental water tank, a communication positioning pipe is arranged on the top of the pressure measurement cylinder, and the bottom surface of the communication positioning pipe is located on the horizontal axis plane of the outflow port; the fluid pressure difference sensor is used for detecting the pressure difference between compressed air in the liquid-gas conversion pressure measurement cylinder and the outside air; the microcomputer is used for converting a pressure difference signal detected by the fluid pressure difference sensor into the flow of the outflow port. According to the pressure signal flow measurement device and the flow measurement method, automatic resetting and real-time zero setting can be achieved, measurement precision is improved, the jet flow of a momentum experiment instrument and an orifice in a basic hydromechanics experiment and the jet flow of an orifice and a pipe nozzle of a pipe nozzle experiment instrument can be measured conveniently, digitally and accurately, and a good teaching effect is achieved.

Description

technical field [0001] The invention relates to the field of experimental measurement, in particular to a pressure signal flow measurement device and a flow measurement method with improved accuracy. Background technique [0002] Hydraulics and fluid mechanics is a major professional basic course for many majors in engineering colleges. Modern hydraulics is built on the three pillars of experiment, theory and calculation. Therefore, experiment is an indispensable content in teaching. Among them, orifice and nozzle outflow is one of the important learning contents in this field of teaching. Holes are opened on the vertical wall of the container, and the flow phenomenon that the fluid flows out through the orifice is called orifice outflow. into a fluid of the same medium. A short tube with a length of about 3 to 4 times the diameter of the orifice is installed on the perimeter of the orifice, and such a short tube is called a cylindrical outer nozzle. Nozzles can be divid...

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Problems solved by technology

[0006] The market and public technical information show that there are many kinds of modern measuring devices and invention patents related to the measurement of liquid flow in pipelines and open channels, but there is no better high flow rate for orifice nozzles under low pressure water head of desktop experimental instruments. Precision digital real-time measuring device

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