Fluid mechanics exploratory experimental device for measuring critical condition of full water at elbow

Abstract

The invention relates to a fluid mechanics exploratory experiment device for measuring a water-full critical condition at an elbow. The fluid mechanics exploratory experiment device comprises an experiment table 10, an experiment table bracket 9, a water supply tank system 1, pipeline systems 2 and 6, adjusting systems 3 and 4, a water-full critical condition measuring system 5, a water collecting tank system 7 and a collecting reflux system 8, the pipeline system comprises a water supply pipe 2 and a measuring water pipe 6; the adjusting system comprises a guide rail 3 and a sliding block 4 which are used for adjusting flow; the full water critical condition measuring system comprises an elbow 5; the collection backflow system comprises a water return pipe led out of the water collection tank 7 and a water pump 8. The change of the flow in the water supply tank is realized by adjusting the slide block on the guide rail, so that when water flow sequentially passes through the water supply pipe, the three-way pipe connected to the guide rail, the water pipe at the measurement part, the thin pipe for measuring the full water critical condition and the water tank, the exploration of the full water critical condition of the elbow is realized according to different water flow filling degrees in the thin pipe; meanwhile, the length or the pipe diameter of the water supply pipe and the three-way pipe can be changed by fixing the height of the sliding block, and other factors influencing the full water critical condition can be explored and found. Compared with the prior art, the experimental device has the advantages that variables are easy to control, experimental data acquisition is accurate and efficient, the using process is simple, safe and reliable, and experimental consumption is reduced by arranging a collection backflow system.

Description

Technical Field

[0001] The invention relates to a fluid mechanics exploratory experimental device for measuring a critical condition of full water at an elbow, and belongs to the technical field of new energy and energy conservation. Background Art

[0003] The purpose of setting up the fluid mechanics experiment is to cultivate students' hands-on ability and innovation ability, so that students can observe, discover, think about problems and then form the ability to solve problems in the experiment, meeting the development needs of modern talent training. However, the existing fluid mechanics experiments are classic experiments that have been around for hundreds of years, with mature experimental equipment. Students just mechanically follow the process to operate, record data, and process results, which is out of touch with the purpose of setting up the experimental link, let alone the cultivation of innovation ability.

[0004] This experimental device originated from the development of a siphon overflow liquid level control device. During the development of the siphon overflow liquid level control device, it was found that the critical condition of full water at the elbow had an important influence on the operating characteristics of the device. However, due to the many influencing factors, only the device application was realized during the development of the project, and the research on the influencing factors and mechanisms of the critical condition of full water at the elbow was not in-depth enough, so it is necessary to carry out relevant research.

[0005] The features and innovations of the present invention are as follows: 1) It originates from actual development topics and has a broad engineering application background; 2) The knowledge points and main research contents involved in the experimental device are closely related to the theoretical part of fluid mechanics, which is within the knowledge mastered by most people in the industry and students; 3) There are many factors affecting the critical condition of full water at the elbow. The experimental device can effectively realize the sequential measurement and research of the variables involved through the control variable method. Summary of the invention

[0006] In order to solve the defects existing in the prior art, the purpose of the present invention is to provide a fluid mechanics exploratory experimental device for measuring the critical condition of full water at an elbow. In order to achieve the above purpose, the technical solution adopted by the present invention is as follows: The invention discloses a fluid mechanics exploratory experimental device for measuring the critical condition of full water at an elbow, comprising four parts: an experimental platform, a water supply system, a water return system, and a regulating and measuring system.

[0007] Preferably, the four systems are a recyclable whole during the experiment, and all parts can be disassembled and replaced; the water supply tank is actually a constant liquid level tank with two partitions inside: a relatively low-height non-porous plate is provided on the side away from the measuring device, and water flows through the top of the plate and overflows into the outermost side of the water tank, and at the same time flows back to the return water tank through the overflow pipe on the lower side of the water tank, ensuring that the liquid level of the water supply tank is constant; a multi-porous flow stabilizing plate is provided on the side near the measuring device, and water can flow through the holes to the front section of the water tank for use in the three-way experimental section, ensuring that the liquid level of the water supply tank is stable; at the same time, a water pipe with a water pump device is provided on the lower side, which can pump water in the return water tank back to the water supply tank; in this way, the liquid level in the water tank can be kept constant and water can be recycled.

[0008] Preferably, during the experiment using the present experimental device, a total of four variables can be measured for the effects of the vacuum degree: by changing the height of the slider on the guide rail, the height difference between the slider and the water supply tank is changed, thereby achieving the purpose of changing the flow rate and thus measuring the critical condition for the elbow to be filled with water; by fixing the height of the slider, by changing the length of the water supply pipe on the front side of the guide rail, the length of the path for the water flow to enter the measurement system is changed, thereby achieving the purpose of changing the system's along-the-way resistance and thus measuring the critical condition for the elbow to be filled with water; by fixing the height of the slider, by changing the length of the vertical water pipe behind the guide rail, the length of the path for the water flow to enter the measurement system is changed, thereby achieving the purpose of changing the system's along-the-way resistance and thus measuring the critical condition for the elbow to be filled with water; by fixing the height of the slider and the length of the inlet and outlet pipes, by changing the diameters of the water supply pipes and the vertical water pipes before and after the guide rails, the purpose of measuring the critical condition for the elbow to be filled with water under different pipe diameters is achieved.

[0009] The present invention provides a fluid mechanics exploratory experimental device for measuring the critical condition of full water at an elbow. The difference from the existing design is that the original implementation device designs the return water system and the water tank used for measuring the vacuum degree into a whole, that is, one water tank takes into account both functions. This will cause a siphon flow to be generated when the water flow is too large due to different influencing factors. Although the background of the present invention is to study the siphon overflow device, such a design is likely to cause the variables to be uncontrollable during the experiment, and the data collected in the experiment are affected by many factors, and the specific parameters of each influencing factor cannot be determined. The present invention divides the water supply system, the return water system, and the regulation and measurement system into three independently working individuals, and at the same time the three are unified as a whole to form the entire experimental device. During the experiment, the critical condition is reached, the elbow and the capillary tube after being full of water act separately, and the return water system circulates separately to the water supply system, which will not produce the above-mentioned influence, and is convenient for conducting experiments, collecting data, and analyzing and studying. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 A three-dimensional structural diagram of a fluid mechanics exploratory experimental device for measuring the critical condition of full water at an elbow implemented in this example;

[0011] Figure 2 A front plan view of an exploratory fluid mechanics experimental device for measuring the critical condition of full water at an elbow implemented in this example. DETAILED DESCRIPTION

[0012] In order to make the technical means of the present invention and the technical effects that can be achieved more clearly and completely disclosed, an embodiment is provided herewith and described in detail as follows in conjunction with the accompanying drawings:

[0013] like Figure 1-Figure 2 As shown, a fluid mechanics exploratory experimental device for measuring the critical condition of full water at an elbow in this embodiment includes four parts: a test bench, a water supply system, a return water system, and a regulation and measurement system.

[0014] The first part is the experimental bench, which includes an experimental table 10 and a support system 9. The entire experimental process can be carried out on this experimental bench.

[0015] The second part is the water supply system, including a water supply tank 1 and a water supply pipe 2. Since the water supply system and the return water system are interconnected, a water pipe port is provided at the lower side of the water supply tank for connecting the return water pipe to realize the recycling of the system.

[0016] The third part is the return water system, including the return water tank 7, the return water pipe and the water pump 8. In the whole experimental system, only the return water tank is placed under the experimental table. During the experiment, there is no need to pay too much attention to the work of the return water system. The water pump set on the return water pipe pumps the water after the experiment into the water supply system for later use.

[0017] The fourth part is the adjustment and measurement system, including the adjustment system and the vacuum measurement system. The adjustment system includes the guide rail 3 and the slider 4; the full water critical condition measurement system includes the elbow 5 and the drain pipe 6 for measuring the full water degree. This part is the core part of the entire experimental device. This device can realize the independent adjustment of each variable. In addition to the return water system and this system being independent entities, it is also inseparable from the fact that each component in this part can be replaced or adjusted. Through simple operation, other variables can be controlled to a fixed value. At the same time, the adjustment of the measured variables, especially the operation of changing the flow rate through the guide rail and the slider, is also relatively simple. It improves the popularity and application level of the experimental bench system.

[0018] The above content is a further detailed description of the technical solution provided in combination with the preferred implementation mode of the present invention. It cannot be determined that the specific implementation of the present invention is limited to the above descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as belonging to the protection scope of the present invention.

Claims

1. A fluid mechanics exploratory experimental device for measuring the critical condition of full water at an elbow, including four parts: an experimental platform, a water supply system, a return water system, and a regulation and measurement system.

2. A fluid mechanics exploratory experimental device for measuring critical conditions of full water at an elbow as claimed in claim 1, characterized in that: The four systems are a recyclable whole during the experiment, and each part can be disassembled and replaced.

3. The fluid mechanics exploratory experimental device for measuring the critical condition of full water at an elbow according to claim 1, characterized in that: By changing the height of the slider on the guide rail, the height difference between it and the water supply tank is changed, so as to achieve the purpose of changing the flow rate and then measuring the critical condition of forming full water.

4. The fluid mechanics exploratory experimental device for measuring the critical condition of full water at an elbow according to claim 1, characterized in that: The height of the slider is fixed, and the length of the water supply pipe and the vertical water pipe before and after the guide rail is changed to change the length of the path for the water flow to enter the measurement system, thereby achieving the purpose of changing the system's along-the-way resistance and then measuring the critical condition for full water.

5. The fluid mechanics exploratory experimental device for measuring the critical condition of full water at an elbow according to claim 1, characterized in that: The height of the slider and the length of the inlet and outlet pipes are fixed, and the diameters of the water supply pipes and the vertical water pipes before and after the guide rail are changed to achieve the purpose of measuring the vacuum degree under different pipe diameters.

6. As claimed in claim 2, it is characterized in that: The water supply tank is actually a constant liquid level tank with two partitions inside: a relatively low non-porous plate is provided on the side away from the measuring device, and water flows through the top of the plate and overflows into the outermost side of the water tank, and at the same time flows back to the return water tank through the overflow pipe on the lower side of the water tank, ensuring a constant liquid level in the water supply tank; a multi-porous flow stabilizing plate is provided on the side close to the measuring device, and water can flow through the holes to the front section of the water tank for use in the three-way experimental section, ensuring a stable liquid level in the water supply tank; at the same time, a water pipe with a water pump device is provided on the lower side, which can pump water in the return water tank back to the water supply tank; in this way, the liquid level in the water tank can be kept constant and water can be recycled.

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