Double-orifice-plate pressure stabilization and electrically-controlled colored water supply type Reynolds experiment instrument and method thereof

Abstract

The invention discloses a double-orifice-plate pressure stabilization and electrically-controlled colored water supply type Reynolds experiment instrument and a method thereof. The Reynolds experiment instrument comprises an electrically-controlled colored water supply device, a double-orifice-plate pressure stabilization water supply box, a transparent experiment pipe, a self-circulating water supply device, a flow regulating valve, a water return pipe and a control circuit. The pressure stabilization performance of the double-orifice-plate pressure stabilization water supply box is much higher than that of a traditional single-pressure-stabilization-plate water supply box, and a half of stabilization time can be shortened; the double-orifice-plate pressure stabilization water supply box has functions of ventilation, dredging and removal of accumulated water in a syringe and can thoroughly solve the problem. The Reynolds experiment instrument is also provided with a novel electric water storage and supply device which pumps up and pressurizes with an air pump to supply water upwards and relieves air and pressure to return water, and colored water is stored and changed freely. Trials indicate that the instrument can improve the experiment efficiency and the demonstration effect, has a very good innovation enlightening effect on students and is very popular among the students and teachers.

Description

technical field [0001] The invention relates to a teaching experiment instrument for fluid mechanics and hydraulics. In particular, it relates to a double-orifice plate stabilized colored water electric control supply type Reynolds tester. Background technique [0002] The Reynolds experiment is one of the traditional classic must-do experiments in fluid mechanics hydraulics. [0003] The Reynolds experiment requires observing the laminar flow and turbulent flow state of the pipe flow, and measuring the lower critical Reynolds number. [0004] The observation of the flow state is displayed by adding colored water in the pipeline as a tracer liquid. The amount of colored water that is added is equivalent to the drop reserve when the human door is injected with saline and hangs the needle. In the case of laminar flow, the fluid particles in the pipeline do not mix with each other, and flow in an orderly and orderly manner. Therefore, the colored water stored from the pipe ...

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Problems solved by technology

The existing problems are: 1. After long-term shutdown, the hose loses its elasticity and often fails to open; 2. The connecting hose and its colored water injection needle are easily blocked by air bubbles or small particles, especially the colored water stuck in the tube after the experiment. The water cannot be excluded, and the needle tube is often scrapped after drying, which makes it difficult for the maintenance of the experimental instrument; 3. In this experiment, the amount of colored water required for laminar flow is small and easy to meet, but in the case of turbulent flow, due to the water flow of the pipe flow The flow rate is relatively high, and the concentration of colored water is required to be enhanced to display and allow students to see the phenomenon of smog-like diffusion and turbulence

In the traditional method, when the elevation of the colored water tank is fixed, the supply of colored water should be increased in the experiment, and the concentration of colored water cannot be enhanced, and the concentration is difficult to adjust

4. The fixed water storage box on the water supply tank of the old Renault experimental instrument is only enough for 1~2 experiments, and the disappearing colored water formulated by the chemical agent is not easy to store for a long time, and needs to be replaced regularly in a few days, but the colored water in the fixed water storage box It is not easy to empty, and long-term storage is prone to precipitation, polluting the water storage box or pipeline, inconvenient to clean, and not easy to replace the colored water solution

Sometimes the maximum critical Reynolds number can only be measured to about 2100, which is far from the 2320 critical Reynolds number measured by the ancestor Reynolds. It is only carried out when it is stable, but in the teaching experiment, teachers and students hope to use the fastest stabilization time to measure the critical Reynolds number closest to 2300 in the limited teaching experiment time

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