CN-114894433-B - Simulation experiment system for cavitation process in liquid low-pressure pipeline in plateau environment

CN114894433BCN 114894433 BCN114894433 BCN 114894433BCN-114894433-B

Abstract

The invention discloses a simulation experiment system for a cavitation process in a liquid low-pressure pipeline in a plateau environment, which comprises a pressure water storage tank, a vacuum pump, a cavitation process pipe section system and a supporting platform, wherein the vacuum pump is connected with the pressure water storage tank through a stainless steel air pipe, a shock-resistant pressure gauge II is further arranged between the stainless steel air pipe and the pressure water storage tank and used for monitoring the pressure in the pressure water storage tank, and the supporting platform is positioned at the lower part of the cavitation process pipe section system and used for supporting and fixing the cavitation process pipe section system. The invention can provide a simulation test system for the cavitation process of equipment and the inside of the equipment in a low-pressure environment of a plateau of 2438 m-5000 m under the normal pressure condition of a low-altitude area, and can provide reasonable and accurate theoretical basis for the formation, development and collapse of the cavitation phenomenon of the infusion pipeline and the inside of the equipment under the high-altitude low-pressure condition.

Inventors

ZHAO LIANG
HUANG JIANG
WANG YANCHUN
ZHANG TIANLAI
ZHANG CHUQIAN
CHEN YONGGANG
CHEN XIANTAO

Assignees

中国民用航空飞行学院

Dates

Publication Date: 20260508
Application Date: 20220426

Claims (9)

1. The simulation experiment system for the cavitation process in the liquid low-pressure pipeline in the plateau environment is characterized by comprising a pressure water storage tank (24), a vacuum pump (22), a cavitation process pipe section system and a supporting platform, wherein the vacuum pump (22) is connected with the pressure water storage tank (24) through a stainless steel air pipe (23), a shock-resistant pressure gauge II (28) is further arranged between the stainless steel air pipe and the pressure water storage tank and used for monitoring the pressure in the pressure water storage tank, and the supporting platform is positioned at the lower part of the cavitation process pipe section system and provides support and fixation for the cavitation process pipe section system; The top of pressure water storage tank (24) be provided with water injection mouth (29) that are used for pressure water storage tank water injection and be used for receiving cavitation process pipe section system return water, overflow water return water mouth (26) and overflow return water mouth (27), pressure water storage tank's side bottom is provided with pipeline water inlet (21).
2. A simulation experiment system for cavitation process in a liquid low-pressure pipeline in a plateau environment is characterized in that a liquid level meter (25) for monitoring the liquid level of the pressure water storage tank is further arranged on the side face of the pressure water storage tank, when the liquid level is too high and reaches an overflow water level, a ball valve II (210) arranged on the pressure water storage tank is opened, and excessive water in the tank is discharged through an overflow pipe II (211) connected with the ball valve II.
3. The simulation experiment system for the cavitation process in the liquid low-pressure pipeline in the plateau environment according to claim 1, wherein the cavitation process pipeline section system comprises a water pump (11), a pipeline compensator (12), a water inlet pipe (13), a ball valve I (16), a manual regulating valve (17), a mass flowmeter (18), a vibration-resistant pressure gauge I (19), a thermometer (110), a cavitation pipe (111), a lifting check valve (112) and a return pipe (113), and the water pump (11) is connected with a pipeline water inlet (21) to realize communication between the cavitation process pipeline section system and a pressure water storage tank (24).
4. A simulation experiment system for a cavitation process in a low-pressure pipeline of a liquid in a plateau environment according to claim 3, wherein the water pump (11) pumps water flowing in the pressure water storage tank (24) through the pipeline compensator (12) and the water inlet pipe (13), then flows through the ball valve I (16), the manual regulating valve (17) and the mass flowmeter (18) which are connected through one outlet of a tee joint, then reaches the cavitation pipe (111), flows out of the cavitation pipe (111), then flows through the pipeline compensator (12), the ball valve I (16) and the lifting check valve (112) to the water return pipe (113), and flows back to the pressure water storage tank (24) through the water return port (26).
5. The simulation experiment system for the cavitation process in the liquid low-pressure pipeline in the plateau environment according to claim 4, wherein the front pipe section and the rear pipe section of the cavitation pipe (111) are respectively provided with a shock-resistant pressure gauge I (19) and a thermometer (110) so as to realize the measurement of the pressure and the temperature of inlet and outlet fluid of the cavitation pipe (111).
6. A simulation experiment system for cavitation process in a liquid low pressure pipeline in a highland environment as set forth in claim 4, wherein the mass flowmeter (18) is used for measuring liquid mass flow.
7. A simulation experiment system for cavitation process in a liquid low-pressure pipeline in a plateau environment according to claim 1 or 3, wherein the cavitation process pipeline section system further comprises a safety valve (14) and an overflow pipe I (15), a water pump (11) pumps water in a pressure water storage tank (24) to pass through a compensator (12) and a water inlet pipe (13), and then the water flows through the safety valve (14) connected with the other outlet of the tee joint to reach the overflow pipe I (15), and finally flows back to the pressure water storage tank (24) from an overflow water outlet (27).
8. The simulation experiment system for the cavitation process in the liquid low-pressure pipeline in the plateau environment according to claim 1, wherein the supporting platform comprises a two-layer steel frame platform (31), a sinking pit (32), a ground (33), a drain hole (34), an escalator (35) and a pipeline supporting frame (36); The two-layer steel frame platform (31) is erected on the ground (33), the pipeline support frame (36) is arranged on the two-layer steel frame platform (31), and the cavitation process pipeline section system is arranged on the pipeline support frame (36) and is supported and fixed by the pipeline support frame; An escalator (35) is arranged between the ground and the two-layer steel frame platform, and can reach the two-layer steel frame platform through the escalator; the sinking pit (32) is arranged in a downward sinking manner from the ground, and the pressure water storage tank (24) is arranged in the sinking pit (32) so as to reduce the height of the whole simulation experiment system; The bottom of the side wall of the sinking pit (32) is provided with a drain hole (34) through which water in the sinking pit can be drained.
9. The simulation experiment system for the cavitation process in the liquid low-pressure pipeline in the plateau environment according to claim 3 is characterized in that the water pump (11) is arranged at the horizontal flush position of the bottom of the pressure water storage tank (24), and the cavitation pipe (111) is arranged at the horizontal flush position of the top of the pressure water storage tank (24).

Description

Simulation experiment system for cavitation process in liquid low-pressure pipeline in plateau environment Technical Field The invention relates to the technical field of cavitation simulation tests, in particular to a simulation test system for cavitation process in a liquid low-pressure pipeline in a plateau environment. Background Gao Gaoyuan the airport environment has the characteristics of low air pressure, large day and night temperature difference, strong radiation and the like, which has a certain influence on the performance of the fire protection system. At present, relevant standards for highland airports are still regulated according to common airports, and no revision basis which is more suitable for the highland environment is obtained at home and abroad. China has Gao Gaoyuan airports with the greatest global and highest elevation, so that deep and comprehensive verification and research on the operation performance of the fire-fighting pipeline system in a low-pressure environment are necessary. The high-altitude low-pressure environment can ensure normal hydraulic transmission, and whether cavitation occurs is clear, for example, about-0.286 atmospheres (saturated vapor pressure) in a Conding airport, the Lasa can reach-0.365 atmospheres, and under the condition of the environmental pressure, the cavitation number of a fire-fighting pipeline can reach about 0.6-6.0, which means that cavitation is very easy to occur. Cavitation, once it occurs, can form a large number of cavitation bubbles, reducing pump efficiency, increasing noise and violent vibration, increasing air content, and possibly even causing flow break, blade damage-which is one of the reasons for flow break of fire-fighting pipes in high-altitude airports. At present, no cavitation experiment and data acquisition device designed under the pressure environment of the plateau exists, but a low-pressure pipeline system with the pressure environment of the plateau generally needs to be built on site at the plateau, so that an experiment can only be carried out to a plateau laboratory, the efficiency is low, the cost is wasted, and laboratory staff is required to adapt to the low-pressure anoxic environment of the plateau, so that long-term scientific research experimental activities are not facilitated. In order to verify and study in detail cavitation phenomena generated in the process of conveying the liquid pipeline in the plateau environment, including formation, development, collapse and the like, a simulation experiment system is needed to perform research and experiment on cavitation mechanism capable of achieving pipeline pressure of-0.4 atmosphere in the normal pressure environment. Disclosure of Invention In order to solve the problems in the prior art, the invention provides a simulation experiment system for cavitation process in a liquid low-pressure pipeline in a plateau environment, and provides a simulation experiment system capable of generating cavitation process in equipment and pipelines in the plateau environment with the pressure of 2438 m-5000 m under the normal pressure condition of a low-altitude area, and a reasonable and accurate theoretical basis can be provided for formation, development and collapse of cavitation phenomena in a transfusion pipeline and equipment under the condition of high altitude low pressure, pressure conditions of different altitudes or plateau environments can be simulated according to requirements, and meanwhile, the whole experiment device is a closed system, so that waterway circulation is realized, and the problems in the background technology are solved. The simulation experiment system comprises a pressure water storage tank, a vacuum pump, a cavitation process pipe section system and a supporting platform, wherein the vacuum pump is connected with the pressure water storage tank through a stainless steel air pipe, a shock-resistant pressure gauge II is further arranged between the stainless steel air pipe and the pressure water storage tank and used for monitoring the pressure in the pressure water storage tank, and the supporting platform is positioned at the lower part of the cavitation process pipe section system and used for supporting and fixing the cavitation process pipe section system. Preferably, the top of the pressure water storage tank is provided with a water filling port for filling water into the pressure water storage tank, a water return port and a water overflow port for receiving backwater and overflow water of a cavitation process pipe section system, and the bottom of the side face of the pressure water storage tank is provided with a pipeline water inlet. Preferably, the side of the pressure water storage tank is also provided with a liquid level meter for monitoring the liquid level of the pressure water storage tank, when the liquid level is too high and reaches the overflow water level, a ball valve II arranged on the pressure water storage tank is