Non-contact fluid velocity measuring tool and measuring method thereof

Abstract

The invention discloses a non-contact fluid velocity measuring tool. The non-contact fluid velocity measuring tool is used for measuring the flow velocity of an outlet pipeline of an experimental section and comprises a fluid transferring instrument, a flow stabilizing pipe and a variable frequency pump which are sequentially connected, wherein the fluid transferring instrument is communicated with the outlet pipeline of the experimental section, and the external fluid flows out of the outlet pipeline of the experimental section, then sequentially flows into the fluid transferring instrument,the flow stabilizing pipe and the variable frequency pump and flows out via the variable frequency pump; the variable frequency pump is used for balancing the flow of the flow stabilizing pipe and theoutlet pipeline of the experimental section so as to enable the flow velocity of the flow stabilizing pipe to be basically consistent with the flow velocity of the outlet pipeline of the experimentalsection; and the middle part of the flow stabilizing pipe is provided with a velocimeter which is used for measuring the fluid velocity of the flow stabilizing pipe so as to indirectly obtain the fluid velocity of the outlet pipeline of the experimental section through the equivalence of the flow velocity of the outlet pipeline of the experimental section and the flow velocity of the flow stabilizing pipe. Compared with the prior art, the non-contact fluid velocity measuring tool has the beneficial effects that there is no interference for an original flow area, and the measured value is effectively approached to a true value; and the tool is simple, easy, economical and applicable and high in accuracy.

Description

technical field [0001] The invention relates to fluid measuring instruments and the field of measurement, in particular to a non-contact fluid velocity measuring tool and a measuring method thereof. Background technique [0002] In scientific research and engineering construction, it is often necessary to measure the flow velocity in the target area. However, in some cases, it is impossible to install a speedometer in the flow area or the installation of a speedometer will greatly affect the original flow state, and the detection element will disturb the original flow state. The flow field affects the measurement accuracy, and also causes pressure loss, resulting in the velocity of the flow area cannot be measured or the measured value is too different from the original value, which makes the measurement work impossible or the accuracy of the measurement result is difficult to guarantee; and for the current common non-contact Measurement methods, such as electromagnetic flow...

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Problems solved by technology

[0002] In scientific research and engineering construction, it is often necessary to measure the flow velocity in the target area. However, in some cases, it is impossible to install a speedometer in the flow area or the installation of a speedometer will greatly affect the original flow state, and the detection element will disturb the original flow state. The flow field affects the measurement accuracy, and also causes pressure loss, resulting in the velocity of the flow area cannot be measured or the measured value is too different from the original value, which makes the measurement work impossible or the accuracy of the measurement result is difficult to guarantee; and for the current common non-contact Measurement methods, such as electromagnetic flowmeters, ultrasonic flowmeters, vortex flowmeters, etc., have limitations such as complicated installation and debugging, poor anti-interference ability, low reliability and accuracy, poor repeatability, short service life and high price.

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