Dynamic bubble quantitative measurement device in hydraulic model test long tunnel

Abstract

A dynamic bubble quantitative measuring device in a hydraulic model test long tunnel is characterized by comprising a base, a telescopic rod and measuring ropes, the telescopic rod is vertically fixed to the top face of the base, scales are arranged on the outer wall face of the telescopic rod, the scale 0 is calculated from the bottom of the base, four spring reels are installed in the base, one measuring rope is wound around each spring reel, and the measuring ropes are connected with the telescopic rod. The measuring rope penetrates through the inside of the telescopic rod and extends out of an opening in the top of the telescopic rod, scales are arranged on the measuring rope, the zero scale starts from the end of the end extending out of the telescopic rod, a blocking piece is arranged at the end, and the blocking piece is larger than the opening in the top of the telescopic rod. According to the device, a device used on a long tunnel model and used for measuring the dynamic bubbles is provided for measuring personnel, and the evolution process of the bubbles is described after calculation by recording bubble form parameters at different moments.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydraulic model test and testing, and in particular relates to a dynamic bubble quantitative measuring device in a long tunnel of a hydraulic model test. Background Art

[0002] In the test of hydraulic model, when simulating a long tunnel, due to the long length of the tunnel and the process of the tunnel inlet from partial opening to full opening, gas will be carried into the tunnel. Through experimental observation, such bubbles will float on the top of the tunnel, and the bubbles will change continuously with the increase of the inlet water level. Since gas is compressible, and water is basically incompressible, the existence of bubbles in the tunnel has a very obvious effect on the change of water pressure in the entire tunnel, and it is necessary to accurately measure it and then quantitatively describe it. For steady-state bubbles, it can be described by directly measuring its length, width and other information, and supplemented by technologies such as photos and videos; but for dynamic bubbles, in addition to surface measurement, the thickness of the bubble must be measured, and the characteristics of the bubble must be described from a three-dimensional form, so as to calculate the volume of the bubble. However, as far as current technology is concerned, there is a lack of a device specifically used to measure the dynamic steam drum in a long tunnel, which brings inconvenience to the measurement work. Utility Model Content

[0003] In order to solve the problem of lack of professional measuring tools, the utility model proposes a dynamic bubble quantitative measuring device in a long tunnel of a hydraulic model test.

[0004] A dynamic bubble quantitative measurement device in a long tunnel for a hydraulic model test, characterized in that it comprises a base, a telescopic rod and a measuring rope, the telescopic rod is vertically fixed on the top surface of the base, a scale is provided on the outer wall surface of the telescopic rod, and the 0 scale is measured from the bottom of the base, four spring reels are installed in the base, a measuring rope is wound on each spring reel, the measuring rope passes through the inside of the telescopic rod and extends out from the opening at the top of the telescopic rod, a scale is provided on the measuring rope, and the 0 scale is measured from the end of one end of the telescopic rod, and a baffle is provided at the end position, and the baffle is larger than the opening at the top of the telescopic rod.

[0005] Furthermore, a locking buckle is provided on the telescopic rod, and the locking buckle is used to lock it when the telescopic rod is extended to a required length.

[0006] The beneficial effect of the utility model is that it provides surveying personnel with a device for measuring dynamic bubbles on a long tunnel model. After fixing the height of the telescopic rod, the measuring rope is pulled out to perform preliminary measurements on the bubbles trapped in the tunnel model. The length, width and thickness of the bubbles are calculated based on the measurement results to obtain three-dimensional data of the bubbles. Finally, by recording the bubble morphology parameters at different times, the evolution process of the bubbles is described after calculation. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 A side view of a device for quantitatively measuring dynamic bubbles in a long tunnel for hydraulic model tests.

[0008] Figure 2 A top view of a dynamic bubble quantitative measurement device in a long tunnel for hydraulic model tests.

[0009] Among them, 1-base, 2-telescopic rod, 3-first measuring rope, 4-second measuring rope, 5-third measuring rope, 6-fourth measuring rope. DETAILED DESCRIPTION

[0010] Embodiment 1: A dynamic bubble quantitative measurement device in a long tunnel of a hydraulic model test, comprising a base 1, a telescopic rod 2 and a measuring rope, wherein the telescopic rod 2 is vertically fixed on the top surface of the base 1, and the outer wall surface of the telescopic rod 2 is provided with a scale, and the 0 scale is measured from the bottom of the base 1. Four spring reels are installed in the base 1, and a measuring rope is wound on each spring reel, namely, the first measuring rope 3, the second measuring rope 4, the third measuring rope 5 and the fourth measuring rope 6, all measuring ropes pass through the inside of the telescopic rod 2 and extend out from the opening at the top of the telescopic rod 2, all measuring ropes are provided with scales, and the 0 scale is measured from the end of the telescopic rod 2, and a baffle is provided at the end position, and the baffle is larger than the opening at the top of the telescopic rod.

[0011] Place the base 1 near the location of the bubble in the tunnel, hold the base 1 steady, extend the telescopic rod 2 to H1 according to the scale on the telescopic rod 2, and the length of H1 should be roughly the same as the length of the bubble. Pull out the first measuring rope 3, the second measuring rope 4, the third measuring rope 5 and the fourth measuring rope 6, and align the ends of the measuring ropes with the four vertices of the bubble edge respectively, record the length of each measuring rope L1, L2, L3 and L4 and record the time at this moment. When the bubble evolves, repeat recording the length of each measuring rope at the edge of the bubble and the test time point. When the bubble no longer changes or disappears due to water pressure or other reasons, the measurement is completed. Match the test data results with the consistent points on the original image to obtain the parameters of the bubble.

Claims

1. A dynamic bubble quantitative measurement device in a long tunnel for hydraulic model tests, characterized in that: It includes a base, a telescopic rod and a measuring rope. The telescopic rod is vertically fixed on the top surface of the base. The outer wall surface of the telescopic rod is provided with a scale, and the 0 scale is measured from the bottom of the base. Four spring reels are installed in the base, and a measuring rope is wound on each spring reel. The measuring rope passes through the inside of the telescopic rod and extends out from the opening at the top of the telescopic rod. The measuring rope is provided with a scale, and the 0 scale is measured from the end of one end of the telescopic rod, and a baffle is provided at the end position, and the baffle is larger than the top opening of the telescopic rod.

2. A dynamic bubble quantitative measurement device in a long tunnel of a hydraulic model test as claimed in claim 1, characterized in that A locking buckle is arranged on the telescopic rod, and the locking buckle is used to lock the telescopic rod when the telescopic rod is telescoped to a required length.

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