Multiphase flow cylindrical model test system and test method

Patent metadata

Field	Value
Publication number	US-12253509-B2
Application number	US-202218048431-A
Country	US
Kind code	B2
Filing date	Oct 20, 2022
Priority date	Dec 14, 2021
Publication date	Mar 18, 2025
Grant date	Mar 18, 2025

Abstract

A multiphase flow cylindrical model test system includes a loading structure, a multiphase flow displacement model bucket, a data acquisition and analysis system, a flexible seepage model bucket and a dynamic control system. A multi-parameter test method in the displacement process of pollutants in three-dimensional multi-field and multiphase media is reasonably configured based on the sequential and superimposed application requirements of heat and steam in the thermal enhanced soil vapor extraction process. The disclosure has the following effects: it can conduct array-type measurement of deformation of specimen during the thermal enhanced soil vapor extraction process, measure the temperature field, conductivity field, moisture field, matrix suction distribution, soil pressure distribution, pore water pressure distribution and pollutant discharge rate of the specimen during the test, and realize the flexible wall permeability triaxial test with bidirectional control of the water head and overcome the influence of the polluted liquid on the test equipment.

First claim

What is claimed is:

1. A multiphase flow cylindrical model test system, comprising: a loading structure ( 1 ), a multiphase flow displacement model bucket ( 2 ), a data acquisition and analysis system ( 3 ), a flexible seepage model bucket ( 4 ) and a dynamic control system ( 5 ), wherein:
the loading structure ( 1 ) is of a gantry type and comprises a T-shaped slide base ( 11 ) at the bottom, a connecting shaft ( 12 ) at the top, a lead screw ( 13 ) and a guide shaft ( 14 ) on both sides, a horizontal beam loading mechanism ( 15 ) moving up and down with the lead screw ( 13 ) and the guide shaft ( 14 ) on both sides to apply a load to the multiphase flow displacement model bucket ( 2 ), the lead screw ( 13 ) being provided with the guide shaft ( 14 ) on its periphery to guide the horizontal beam loading mechanism ( 15 ) to move in a fixed direction; an outside of the lead screw ( 13 ) and the guide shaft ( 14 ) on both sides is wrapped by a profile ( 131 ), upper and lower parts of the horizontal beam loading mechanism ( 15 ) being closed by connecting the profile ( 131 ) with flexible louvers ( 132 ); a lower surface of the horizontal beam loading mechanism ( 15 ) is provided with a force sensor ( 16 ) and a displacement sensor ( 17 ) so as to observe a loading force and displacement of a specimen in the multiphase flow displacement model bucket ( 2 ); two lifting rings ( 151 ) are symmetrically arranged at a lower end of the horizontal beam loading mechanism ( 15 ) for the multiphase flow displacement model bucket ( 2 ), a loading cover plate ( 23 ) and an air pressure protection plate ( 24 ) to be lifted;
the T-shaped slide base ( 11 ) is of T-shaped, with an upper part being provided with two sliding bars ( 111 ) to facilitate the multiphase flow displacement model bucket ( 2 ) to slide back and forth on the sliding bars, both ends of the sliding bars ( 111 ) being provided with stop pins ( 112 );
the multiphase flow displacement model bucket ( 2 ) is a bucket-shaped hollow cavity whose upper and lower parts are able to be disassembled, with a side wall whose surface is provided with 12 glass windows ( 21 ) in four columns and three rows; a thermal enhanced soil vapor extraction pipe ( 22 ) is arranged on the axis of a bottom plate ( 20 ) of the multiphase flow displacement model ( 2 ), and a total of 12 thermal enhanced soil vapor extraction pipes ( 22 ) are scattered in two circles around the axially arranged the thermal enhanced soil vapor extraction pipe ( 22 ) at other locations of the bottom plate ( 20 ) so as to achieve heating of the specimen and suction of fluid, and a spacing between the thermal enhanced soil vapor extraction pipes ( 22 ) in an outer circle and the thermal enhanced soil vapor extraction pipes ( 22 ) in an inner circle is equal to a spacing between the thermal enhanced soil vapor extraction pipes ( 22 ) in the inner circle and the thermal enhanced soil vapor extraction pipe ( 22 ) at the axis; an edge of the bottom plate ( 20 ) is connected with the lower part of the multiphase flow displacement model bucket ( 2 ) through bolts ( 215 ); the bottom plate ( 20 ) is provided with a drainage channel ( 216 ) running through an inside and outside of the bottom plate ( 20 ), and an upper part of the bottom plate ( 20 ) is provided with a permeable plate ( 217 ) so that a liquid formed in the process of thermal enhanced soil vapor extraction is collected through the permeable plate ( 217 ) and then discharged through the drainage channel ( 216 );
an air pressure protection plate ( 24 ) is arranged at the top of the multiphase flow displacement model bucket ( 2 ), with an edge being connected to the multiphase flow displacement model bucket ( 2 ) through bolts ( 215 ); a pressure-charging valve ( 210 ) and a pressure relief valve ( 29 ) are symmetrically arranged on an upper part of the air pressure protection plate ( 24 ) with respect to a center of the air pressure protection plate ( 24 ) so as to facilitate filling of an internal pressure of the multiphase flow displacement model bucket ( 2 ) and automatic pressure relief when a pressure is too large; a top surface of the specimen inside the multiphase flow displacement model bucket ( 2 ) is provided with a loading cover plate ( 23 ); a side wall of the loading cover plate ( 23 ) adopts a C-shaped ball sliding mechanism ( 231 ) to come into contact with the multiphase flow displacement model bucket ( 2 ) so as to ensure that the loading cover plate ( 23 ) is able to slide up and down on an inner wall of the multiphase flow displacement model bucket ( 2 ) u during the loading process, a lower part of the loading cover plate ( 23 ) coming into contact with the specimen through a flexible rubber pad ( 25 ), an arc-shaped sealing sheet ( 214 ) being arranged around an upper part of the loading cover plate ( 23 ) to realize sealing of a space formed between the loading cover plate ( 23 ), the multiphase flow displacement model bucket ( 2 ) and the air pressure protection plate ( 24 ), and the sealed space between the loading cover plate ( 23 ), the multiphase flow displacement model bucket ( 2 ) and the air pressure protection plate ( 24 ) being pressurized by a dynamic control system ( 5 ) through the pressure-charging valve ( 210 ) to ensure tight fit of the arc-shaped sealing sheet ( 214 ) and an inner wall of the multi-phase flow displacement model bucket ( 2 ) so as to ensure sealing effect; a loading rod ( 26 ) and a built-in force sensor ( 27 ) are arranged at the axis of the upper part of the loading cover plate ( 23 ), an upper end of the loading rod ( 26 ) penetrating a linear bearing ( 28 ) of the air pressure protection plate ( 24 ) to be connected to a force sensor ( 16 ) and a displacement sensor ( 17 ) of the loading structure ( 1 ), and a lower end of the loading rod ( 26 ) being connected to the loading cover plate ( 23 ) through the built-in force sensor ( 27 );
the thermal enhanced soil vapor extraction pipes ( 22 ) are scattered at the bottom of the multiphase flow displacement model bucket ( 2 ), a pressure relief valve ( 29 ) being arranged in a middle part of a side wall of the multiphase flow displacement model bucket ( 2 ) to facilitate automatic pressure relief when the pressure in the multiphase flow displacement model bucket ( 2 ) exceeds a limit; LED ring lightings ( 212 ), cameras ( 37 ) and light hoods ( 213 ) are arranged outside the 12 glass windows ( 21 ) at a surface of the multiphase flow displacement model bucket ( 2 ) to provide a stable test light source and take pictures; and a total of 12 circular sensor sockets ( 211 ) in four columns and three rows are arranged at a position between the horizontal glass windows ( 21 ) of the side wall surface of the multiphase flow displacement model bucket ( 2 ) to facilitate insertion of sensors;
the data acquisition and analysis system ( 3 ) is in communication with the specimen inside the multiphase flow displacement model bucket ( 2 );
the flexible seepage model bucket ( 4 ) is a cylindrical hollow cavity, with its sidewall surface being uniformly provided with 12 glass windows ( 21 ) in four columns and three rows in order to observe deformation of the specimen during the test; a lower part of the flexible seepage model bucket ( 4 ) is connected to an edge of a multifunctional base ( 41 ) through bolts ( 215 ), and an upper part of the flexible seepage model bucket ( 4 ) is connected with a top plate ( 42 ) through bolts ( 215 ); an upper part of the multifunctional base ( 41 ) of the flexible seepage model bucket ( 4 ) is provided with permeable stones ( 411 ), a base seat below the permeable stones ( 411 ) being engraved with a spiral line ( 412 ) and a through drainage hole ( 413 ), the drainage hole ( 413 ) being connected to an external high-hardness PVC water measuring pipe ( 43 ), the high-hardness PVC water measuring pipe ( 43 ) being connected to an air pressure

Assignees

• Inst Rock & Soil Mech Cas

Inventors

• Xue Qiang
• Chen Zhixiang
• Wan Yong
• Wei Mingli
• Li Jiangshan
• Liu Lei
• Chen Yijun
• Li Yuan

Classifications

• G01D21/02

  Measuring two or more variables by means not covered by a single other subclass · CPC title

• G01N33/24 Primary

  Earth materials (G01N33/42 takes precedence) · CPC title