Flow rate measuring device based on ultrasonic reflecting signal and measuring device

Abstract

The invention discloses a flow rate measuring device based on an ultrasonic reflecting signal. The flow rate measuring device comprises a measuring rod, wherein a first probe with ultrasonic transmitting and receiving functions is arranged at the bottom end of the measuring rod; a first reflecting probe and a second reflecting probe are arranged around the first probe, and are connected with the measuring rod through connecting rods; the first probe, the first reflecting probe and the second reflecting probe are respectively connected with a signal processing unit. The flow rate measuring device based on the ultrasonic reflecting signal has the advantages that the plane two-dimensional flow rate is realized, the measuring blind area is small, and the like; a signal detection circuit only needs to detect the pulse reflecting time, a signal processing circuit is simple, and the instrument cost is greatly reduced in comparison with that of the ultrasonic Doppler measuring instrument.

Description

technical field [0001] The invention relates to a flow velocity measurement device and a measurement method based on ultrasonic reflection signals, and belongs to the field of flow velocity measurement. Background technique [0002] There are many impurities in the water flow of the solid model, which can easily block the Pitot tube inlet pipe and damage the HWFA sensitive components. Therefore, the Pitot tube and HWFA are generally not suitable for solid model tests. Both PIV and LDV have the advantages of non-contact measurement. PIV can measure the velocity field, concentration field, temperature field, etc., while LDV can only measure single point. PIV and LDV have limited measurement range, cumbersome layout, and are easily interfered by impurities, so it is difficult to apply them on a solid model in a large scale. The miniature propeller flowmeter and ADV are commonly used in the measurement of solid model flow velocity. The miniature propeller flowmeter is easy to o...

AI Technical Summary

Problems solved by technology

PIV and LDV have limited measurement range, cumbersome layout, and are easily interfered by impurities, so it is difficult to apply them on a solid model in a large scale

The miniature propeller flowmeter and ADV are commonly used in the measurement of solid model flow velocity. The miniature propeller flowmeter is easy to operate, low in price, and has high measurement accuracy. The propeller can only be rotated for measurement when the flow rate is greater than the starting flow rate. When the flow rate is small, the measurement error is large, and the instrument cannot measure the flow direction

ADV has high measurement accuracy and can measure three-dimensional point flow velocity and flow direction at the same time. Since the propagation speed of ultrasonic waves in air and water flow is inconsistent, the transmitting and receiving probe must be placed under the water surface to perform accurate measurement. Therefore, it has certain interference to the flow state, and its price Expensive, difficult to apply on a large scale

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