Experimental apparatus for measuring spray characteristics under low air pressure condition

An experimental device and low air pressure technology, applied in the field of safety science and engineering experimental equipment, can solve the problems that have not been seen in measuring the characteristics of fine water mist, and achieve the effect of convenient installation and avoiding the deviation of focus position

Inactive Publication Date: 2010-10-20
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to the retrieval of domestic and foreign literature and patents, only the literature on the use of PDA technology to measure the characteristics of fine water mist under normal pressure conditions has been retrieved. Literature and Patents

Method used

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  • Experimental apparatus for measuring spray characteristics under low air pressure condition
  • Experimental apparatus for measuring spray characteristics under low air pressure condition
  • Experimental apparatus for measuring spray characteristics under low air pressure condition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The present embodiment adopts PDA technology to measure the spherical vacuum chamber experimental device of the experimental device of spray characteristic under the condition of low pressure such as figure 1As shown: the experimental device includes a closed vacuum chamber with an air pumping hole and a vacuum pressure gauge on the wall. The vacuum chamber 13 in this embodiment is composed of upper and lower stainless steel hollow hemispheres fixed and sealed with bolts and rubber gaskets. The air pumping hole is connected to the vacuum pump S2 through a pipeline 16 with a valve 5; the top of the vacuum chamber 13 is provided with a fine water mist nozzle 3, and the fine water mist nozzle 3 is connected to the water supply system S1 through a pipeline 2 with a valve 4 Pass; the top center of the vacuum chamber 13 is fixedly installed with the pipe 2 connected with the water supply system S1 through the top flange 15, and the flange pieces are fixed by the clamp joint 21...

Embodiment 2

[0033] Figure 5 It is a structural schematic diagram of a cylindrical vacuum chamber experimental device that adopts PDA technology to measure the characteristics of water mist under low pressure conditions. The installation is transparent tempered glass.

[0034] The center of the top of the vacuum chamber 13 is fixed with the pipe 2 connected to the water supply system S1 through the top flange 15, and the flanges are fixed by the clamp joint 21 to facilitate the disassembly and replacement of the fine water mist nozzle, the pipe 2 and the water supply system S1 There are manual ball valves 4 between them. The lower end of the pipeline 2 is close to the top of the vacuum chamber 13, and the water mist nozzle 3 is installed with a clamp joint 21. A vacuum pressure gauge 1 and an exhaust pipeline 16 are respectively installed on both sides of the top flange, and the vacuum pressure gauge 1 is fixed by a threaded pipe joint. On the outer wall of the vacuum chamber 13, the ex...

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Abstract

The invention discloses an experimental apparatus for measuring spray characteristics under a low air pressure condition by using a laser phase Doppler technique. The experimental apparatus is characterized in that: a wall of a pressure-resistant vacuum chamber of the experimental apparatus is provided with an air suction hole which is connected with a vacuum pump through a pipeline provided with a valve; a spray head on the top part of the vacuum chamber is connected with a water supply system through the pipeline provided with the valve by adopting a clamp-type connector; the connecting parts of glass of three transparent windows arranged on the wall of the vacuum chamber and a base welded on the wall surface adopts an internal-thread external-channel type structure and an inner cavity type structure; the center at the bottom of the vacuum chamber is provided with a liquid storage pipe section protruding downward, and the liquid storage pipe section is communicated with the atmosphere through the valve; and two laser beams of a PDA measurement system pass through the first window and the second window respectively and then are focused in the vacuum chamber to generate interference fringes, and the interference fringes are refracted and magnified by spray particles first, then are absorbed after passing through the third transparent window, and are sent to a computer for processing and analysis. The experimental apparatus can be used for performing measurement and research on the spray characteristics under the low air pressure condition.

Description

technical field [0001] The invention belongs to the technical field of safety science and engineering experimental equipment, in particular to an experimental device for measuring spray characteristics by using a laser phase Doppler analyzer under low pressure conditions. Background technique [0002] Low air pressure exists in various environmental conditions such as plateaus, high altitudes, and vacuum equipment. Water mist fire extinguishing technology has many advantages such as high fire extinguishing efficiency, no pollution to the environment, safety to on-site personnel and equipment, and less water consumption. A lot of work has been carried out on its fire extinguishing performance under normal pressure conditions, and it has been widely Applications. But so far there is still a lack of research work on the characterization of fine water mist under low pressure conditions, and there is no simulated experimental device suitable for measuring the particle size and v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M19/00G01N15/00G01N15/02G01M99/00
Inventor 王喜世许红利刘良宝秦俊
Owner UNIV OF SCI & TECH OF CHINA
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