CN113028299A - Gas-liquid equivalent detection method and system for micro leakage of aviation hydraulic pipeline - Google Patents

Gas-liquid equivalent detection method and system for micro leakage of aviation hydraulic pipeline Download PDF

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CN113028299A
CN113028299A CN202110253820.1A CN202110253820A CN113028299A CN 113028299 A CN113028299 A CN 113028299A CN 202110253820 A CN202110253820 A CN 202110253820A CN 113028299 A CN113028299 A CN 113028299A
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leakage
gas
medium
equivalent
liquid
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CN113028299B (en
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骆彬
程立鑫
张开富
程晖
邓力川
方珍义
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Northwestern Polytechnical University
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D5/00—Protection or supervision of installations
    • F17D5/02—Preventing, monitoring, or locating loss
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
    • F15B19/005—Fault detection or monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
    • F15B19/007—Simulation or modelling

Abstract

The invention discloses a gas-liquid equivalent detection method and a gas-liquid equivalent detection system for micro leakage of an aviation hydraulic pipeline, wherein the method comprises the following steps: obtaining modeling parameters; establishing a pipe fluid flow model according to the modeling parameters; performing equivalent characterization of the gaseous medium and the liquid medium according to characteristics of the compressible fluid and the incompressible fluid based on the pipe fluid flow model; acquiring the gas pressure drop of a detection leakage point; and equivalently calculating the leakage amount of the oil medium by detecting the gas pressure drop of the leakage point based on the equivalent characteristics of the gas medium and the liquid medium. The invention adopts low-pressure airtight equivalent high-pressure oil-tight detection, and solves the problems of large waste, high cost, difficult detection of small leakage in automatic test and the like of the existing oil-tight test method.

Description

Gas-liquid equivalent detection method and system for micro leakage of aviation hydraulic pipeline
Technical Field
The invention relates to the technical field of aerospace, in particular to a gas-liquid equivalent detection method and system for micro leakage of an aviation hydraulic pipeline.
Background
The aircraft hydraulic system is one of main functional systems of an aircraft and is a key system related to the safety of the aircraft. The hydraulic pipeline is an important component of an aircraft hydraulic system and is a channel for conveying an oil medium, the performance of the hydraulic pipeline is directly related to the safety and the reliability of the hydraulic system and further related to the performance of the aircraft, once the oil leakage occurs in the hydraulic pipeline, the whole hydraulic system fails in a short time, a system which relies on hydraulic energy to provide power on the aircraft fails immediately, and an aircraft grade accident can be caused in serious cases. In order to ensure the safety and reliability of the hydraulic pipeline, a hydraulic pipeline sealing test needs to be carried out for checking whether leakage points exist in the installed pipeline or the hydraulic system.
The hydraulic system pipeline has the characteristics of long loop, large number of joints, narrow external space and the like, the current detection link still adopts manual detection, workers are required to check each joint, and the mode can not expose the tiny leakage at the joint of the pipeline generally. When the diameter of a leak hole is larger than 1mm, the pressure curve in the pipeline has obvious singularity, so that the problem of micro-leakage can not be solved obviously; for the ultrasonic leak detection method for detecting the leak of the spacecraft cabin and the pipeline system, the sound signal generated at the leak hole needs to be transmitted to the receiving sensor of the sound transducer and effectively detected to detect the leak, and the collection difficulty of the sound signal of the leak hole is greatly increased and even the leak hole signal is difficult to receive due to the large noise of the field environment. If adopt the gas medium to detect the pipeline, because the gas molecule is little, and dynamic viscosity is far less than hydraulic oil, produces the gap department of little seepage at fluid, the gas medium can spill more easily, and the gas medium characteristics such as easy flowing, easy diffusion to the precision that check out test set can discern is also higher, detects the leakage more easily.
Disclosure of Invention
The invention aims to provide a gas-liquid equivalent detection method and system for micro leakage of an aviation hydraulic pipeline, which replace oil-tight detection by an air-tight detection method with smaller medium molecules, higher detection precision and lower detection cost, so that the problems of high oil-tight test cost, high pollution, difficult micro leakage and the like of the hydraulic pipeline are solved.
In order to achieve the purpose, the invention provides the following scheme:
a gas-liquid equivalent detection method for micro leakage of an aviation hydraulic pipeline comprises the following steps:
obtaining modeling parameters, wherein the modeling parameters comprise aviation hydraulic pipeline characteristics in engineering, joint distribution conditions, existing test process specifications and required indexes;
establishing a pipe fluid flow model according to the modeling parameters;
performing equivalent characterization of the gaseous medium and the liquid medium according to characteristics of the compressible fluid and the incompressible fluid based on the pipe fluid flow model;
acquiring the gas pressure drop of a detection leakage point;
and equivalently calculating the leakage amount of the oil medium by detecting the gas pressure drop of the leakage point based on the equivalent characteristics of the gas medium and the liquid medium.
Optionally, the hydraulic line characteristics include line diameter, line length, joint location, and joint leakage.
Optionally, the establishing a pipe fluid flow model according to the modeling parameters specifically includes:
establishing a pipeline model according to the modeling parameters;
determining a calculation region for solving;
and establishing a pipe fluid flow model according to the pipeline model and the calculation area.
Optionally, the performing, based on the pipe fluid flow model, equivalent characterization of the gaseous medium and the liquid medium according to characteristics of a compressible fluid and a non-compressible fluid specifically includes:
performing a leakage characterization of the gaseous medium according to the characteristics of the compressible fluid based on the pipe fluid flow model;
based on the pipe fluid flow model, according to the characteristics of the non-compressible fluid, performing the leakage characterization of the oil fluid medium;
and performing equivalence on the representation of the leakage amount of the gas medium and the representation of the leakage amount of the oil medium.
The invention also provides a gas-liquid equivalent detection system for micro leakage of an aviation hydraulic pipeline, which comprises the following components:
the parameter acquisition module is used for acquiring modeling parameters, wherein the modeling parameters comprise aviation hydraulic pipeline characteristics, joint distribution conditions, existing test process specifications and required indexes in engineering;
the modeling module is used for establishing a pipe fluid flow model according to the modeling parameters;
the equivalent characterization module is used for performing equivalent characterization on the gas medium and the liquid medium according to the characteristics of the compressible fluid and the non-compressible fluid on the basis of the pipe fluid flow model;
the gas pressure drop acquisition module is used for acquiring the gas pressure drop of the leakage point;
and the leakage amount calculation module is used for equivalently calculating the leakage amount of the oil liquid medium by detecting the gas pressure drop of a leakage point based on the equivalent characteristics of the gas medium and the liquid medium.
Optionally, the hydraulic line characteristics include line diameter, line length, joint location, and joint leakage.
Optionally, the modeling module specifically includes:
the first modeling unit is used for establishing a pipeline model according to the modeling parameters;
a determination unit configured to determine a solution calculation region;
and the second modeling unit is used for establishing a pipe fluid flow model according to the pipeline model and the calculation area.
Optionally, the equivalent characterization module specifically includes:
the first characterization unit is used for performing the leakage quantity characterization of the gas medium according to the characteristics of the compressible fluid on the basis of the pipe fluid flow model;
the second characterization unit is used for performing the leakage quantity characterization of the oil medium according to the characteristics of the non-compressible fluid based on the pipe fluid flow model;
and the equivalent unit is used for performing equivalence on the representation of the leakage amount of the gas medium and the representation of the leakage amount of the oil medium.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a gas-liquid equivalent detection method and a gas-liquid equivalent detection system for micro leakage of an aviation hydraulic pipeline, wherein the method comprises the following steps: obtaining modeling parameters; establishing a pipe fluid flow model according to the modeling parameters; performing equivalent characterization of the gaseous medium and the liquid medium according to characteristics of the compressible fluid and the incompressible fluid based on the pipe fluid flow model; acquiring the gas pressure drop of a detection leakage point; and equivalently calculating the leakage amount of the oil medium by detecting the gas pressure drop of the leakage point based on the equivalent characteristics of the gas medium and the liquid medium. The invention adopts low-pressure airtight equivalent high-pressure oil-tight detection, and solves the problems of large waste, high cost, difficult detection of small leakage in automatic test and the like of the existing oil-tight test method.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a flow chart of a gas-liquid equivalent detection method for micro leakage of an aviation hydraulic pipeline according to an embodiment of the invention;
FIG. 2 is a block diagram of a leak path of a fitting according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of parameters of a gas medium in a leakage pipeline according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a gas-liquid equivalent detection method and system for micro leakage of an aviation hydraulic pipeline, which replace oil-tight detection by an air-tight detection method with smaller medium molecules, higher detection precision and lower detection cost, so that the problems of high oil-tight test cost, high pollution, difficult micro leakage and the like of the hydraulic pipeline are solved.
Firstly, determining an aviation hydraulic pipeline model; determining a solving area and calculating boundary conditions according to the pipeline model;
secondly, according to a pipeline model, according to the difference of the flow state and the motion equation of low-pressure gas and high-pressure liquid in the pipeline, respectively solving the pressure and the flow of a leakage hole for the leaked pipeline, establishing a pipeline fluid interface solving function under the constraint of leakage conditions, performing gas-liquid fluid equivalent calculation to obtain an equivalent calculation method of a gas-liquid medium in the pipeline, and further establishing a pipeline flow pressure solving function equivalent to different gas-liquid media;
and finally, establishing a gas-liquid equivalent test method according to the flow field and interface equivalent solving function, testing the hydraulic pipeline by using low-pressure gas, performing equivalent transformation on the air pressure and the flow speed detected by the outlet surface, and equivalently calculating the leakage oil loss in the oil seal detection by using the air pressure drop.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1, the gas-liquid equivalent detection method for micro leakage of the aviation hydraulic pipeline provided by the invention comprises the following steps:
step 101: and obtaining modeling parameters, wherein the modeling parameters comprise aviation hydraulic pipeline characteristics, joint distribution conditions, existing test process specifications and required indexes in engineering. The hydraulic line characteristics include line diameter, line length, joint location and the amount of joint leakage.
Step 102: and establishing a pipe fluid flow model according to the modeling parameters. The method specifically comprises the following steps: establishing a pipeline model according to the modeling parameters; determining a calculation region for solving; and establishing a pipe fluid flow model according to the pipeline model and the calculation area.
According to the size characteristics of the pipeline and the layout condition of the joints in the process in the step 101, a long straight-end pipeline comprising one joint is selected for analysis, a straight round pipe equivalent conduit with the wall friction coefficient f and a circular hole with the area A are used for simulating the joint with leakage, a pipeline theoretical solution model is established, a solution calculation area is determined, and then a pipe fluid flow model suitable for the actual problem of the process is established.
As shown in fig. 2, the solution area involved in step 102 is a solution target according to a straight line segment in the pipe loop of step 101, wherein the solution target includes a joint, and the pipe segment is a straight circular pipe with a uniform pipe diameter D and a length L; the joint is a common flaring joint, the seal is formed by two conical surfaces, a leak hole (a distance from an inlet x) on the pipe wall is used for replacing leakage, and the leakage rate delta (kg/s) is set to quantitatively represent different leakage grades; the solving area is a straight circular tube and a fluid area in the leakage hole, the hole wall and the tube wall are non-calculating areas, and the near-wall area is a speed zero point according to a boundary non-slip theory.
The pipe fluid flow modeling process involved in step 102 is as follows:
assuming that the gas in the pipe flows completely, taking a fluid micelle at one point in the flow field of the straight circular pipe, and listing a fluid control equation according to the mass, momentum and energy conservation equation:
total mass of the control body: integral multiple ofΩρEdV；
Controlling the total momentum of the body:
Figure BDA0002959260430000061
total energy of control body: integral multiple ofΩEdV；
The control volume energy increase is equal to the net energy flow in through the control surface, resulting in:
Figure BDA0002959260430000062
the fluid control equation is listed in terms of energy conservation:
Figure BDA0002959260430000063
in the formula, E energy density, FxEEnergy flux, F, through a vertical x-direction surface elementyEEnergy flux, F, through a vertical y-direction surface elementzEEnergy flux, C, through a vertical z-direction surface elementv-constant specific heat, gamma-specific heat, T-temperature, u-x direction velocity, v-y direction velocity, w-z direction velocity.
Because the cross-sectional area of the pipeline in the loop cannot be changed, the distribution of the velocity along the interface is not required to be considered in the calculation of the pressure and the flow velocity, and the leakage only occurs at the joint in the engineering problem, the pipe wall is not required to be considered in the calculation area, so that the problem can be simplified by utilizing a one-dimensional constant flow model.
For one-dimensional steady flow, in order to perform leakage quantity characterization, the volume and mass flow need to be solved, and the volume and mass flow passing through a certain cross section are as follows:
volume flow rate: q. q.sv＝∫∫Av·dA＝∫∫Avcos(v，n)dA＝∫∫AvndA (3)
Mass flow rate: q. q.sm＝∫∫Aρv·dA＝∫∫Aρvcos(v，n)dA＝∫∫AρvndA (4)
In the formula: v-fluid velocity, v-fluid velocity direction, n-control surface normal direction.
Step 103: equivalent characterization of the gaseous medium and the liquid medium is performed based on the pipe fluid flow model, according to the characteristics of the compressible fluid and the non-compressible flow. The method specifically comprises the following steps: performing a leakage characterization of the gaseous medium according to the characteristics of the compressible fluid based on the pipe fluid flow model; based on the pipe fluid flow model, according to the characteristics of the non-compressible fluid, performing the leakage characterization of the oil fluid medium; and performing equivalence on the representation of the leakage amount of the gas medium and the representation of the leakage amount of the oil medium.
1) According to the characteristics of the compressible fluid, the leakage quantity of the gas medium is represented;
calculating the leakage amount of the gas medium at the leakage hole based on the solving relation in step 102 according to the pipe fluid flow model established in step 102:
for an ideal gas adiabatic flow process, as shown in FIG. 3: according to the energy conservation formula (2), in the gas leakage process, the finishing is obtained:
Figure BDA0002959260430000071
in the formula, ECVControlling the internal energy of the volume (straight circular tube), heSpecific enthalpy (J.kg) of leakage point gas flow-1) C-the velocity of the leakage point gas flow,
Figure BDA0002959260430000072
leakage rate (mass flow at the point of leakage kg. s)-1) τ -time.
Internal energy ECV＝mCVT，Cv-constant specific heat capacity, m-mass of gas in the tube, and T-temperature of gas in the tube.
Specific enthalpy he＝CpTe，CpSpecific heat at constant pressure, Te-the temperature of the gas flow at the outlet interface of the leak.
Equation (5) is written as:
Figure BDA0002959260430000073
from the critical leakage state, one can obtain
Figure BDA0002959260430000074
In the formula, k is a gas adiabatic coefficient, and R is an ideal gas constant.
The leak rate can be found:
Figure BDA0002959260430000075
wherein, V is the volume of the control body (circular tube), m0Control of the mass of the gas, c0-initial velocity of the gas (inlet face velocity),
Figure BDA0002959260430000076
-a speed scaling factor.
Figure BDA0002959260430000081
Figure BDA0002959260430000082
Figure BDA0002959260430000083
Figure BDA0002959260430000084
In the formula, P0、T0Initial pressure and temperature values of the control body (equal to pressure on the inlet surface), L is total length of the pipe, x is distance between a leak point and the inlet surface, and D is diameter of the pipe.
Substituting into (8), obtaining the gas medium leakage rate:
Figure BDA0002959260430000085
2) and according to the characteristics of the incompressible fluid, representing the leakage amount of the oil fluid medium.
And calculating the leakage amount of the oil-tight medium according to the solving area determined in the step 102.
Because the oil viscosity is high, the on-way friction needs to be considered:
taking a cylindrical fluid infinitesimal with the length dx and the radius r in the circular tube, and taking mass force and inertia force into consideration, listing an equilibrium equation:
Figure BDA0002959260430000086
according to newton's theorem of viscosity:
Figure BDA0002959260430000087
in the formula, tau-shear stress, mu-dynamic viscosity
The following steps are provided:
Figure BDA0002959260430000088
then there are:
Figure BDA0002959260430000091
integrating equation (17) yields:
Figure BDA0002959260430000092
from the boundary condition, when R is R, u is 0, and the value can be obtained
Figure BDA0002959260430000093
Substitution formula (18) having:
Figure BDA0002959260430000094
taking a circular ring with the thickness dr at the radius r of the circular tube, the flow dq on the section of the circular ring is as follows:
Figure BDA0002959260430000095
the integral equation (20) yields:
Figure BDA0002959260430000096
the on-way pressure variation is obtained according to equation (21):
Figure BDA0002959260430000097
further comprising:
Figure BDA0002959260430000098
Figure BDA0002959260430000099
in the formula, P1-pressure at the inlet face of the pipe, P2Pressure of the cross-section of the bore, P3Pressure at the outlet of the tube, mu dynamic viscosity, L total length of the tube, x distance between the cross section of the orifice and the inlet, Q volume flow, D diameter of the tube
According to Bernoulli's equation, there are
Figure BDA0002959260430000101
Figure BDA0002959260430000102
In the formula, v1-speed of the inlet face of the tube, v2-cross-sectional velocity of the leak point, v3Velocity of outlet face of tube, Pa-pressure outside the hole (i.e. atmospheric pressure), vaLeakage velocity, p-liquid density, alpha1、α2、α3、αaFor kinetic energy correction factors, usually 1 is taken for turbulent flow and 2 for laminar flow, where α is due to the presence of turbulent flowa＝1，α1＝α1＝α3＝2。
Obtaining the leakage rate
Figure BDA0002959260430000103
H in the formula (26)LThe loss due to the shape of the hole,
Figure BDA0002959260430000104
according to the outflow coefficient expression, there are:
Figure BDA0002959260430000105
the coefficient of outflow can be obtained from a look-up table, and the hydraulic loss can be calculated.
Because of the tiny leakage, the lost material does not cause a significant change in flow rate, as can be seen by finite element simulation:
v2≈v3 (30)
combined vertical type (23) -formula (30), and obtaining the flow velocity at the leak hole:
Figure BDA0002959260430000106
and further obtaining the leakage rate of the oil medium:
Figure BDA0002959260430000111
step 104: and acquiring the gas pressure drop of the detection leakage point.
Step 105: and equivalently calculating the leakage amount of the oil medium by detecting the gas pressure drop of the leakage point based on the equivalent characteristics of the gas medium and the liquid medium.
Setting an airtight test, arranging temperature and flow sensors on the end face of the inlet of the pipeline and outside the joint, introducing nitrogen with the stable pressure of 0.3MPa into the pipeline, and solving according to the formula (13) to obtain the equivalent leakage area of the joint; this value is substituted into the formula (32) and brought into the steady pressure P of the oil-tightness test1And calculating to obtain the corresponding leakage amount of the oil medium, thereby realizing equivalent detection of leaked gas and liquid.
The invention also provides a gas-liquid equivalent detection system for micro leakage of an aviation hydraulic pipeline, which comprises the following components:
the parameter acquisition module is used for acquiring modeling parameters, wherein the modeling parameters comprise aviation hydraulic pipeline characteristics, joint distribution conditions, existing test process specifications and requirement indexes in engineering. The hydraulic line characteristics include line diameter, line length, joint location and the amount of joint leakage.
And the modeling module is used for establishing a pipe fluid flow model according to the modeling parameters. The method specifically comprises the following steps: the first modeling unit is used for establishing a pipeline model according to the modeling parameters; a determination unit configured to determine a solution calculation region; and the second modeling unit is used for establishing a pipe fluid flow model according to the pipeline model and the calculation area.
And the equivalent characterization module is used for performing equivalent characterization on the gas medium and the liquid medium according to the characteristics of the compressible fluid and the non-compressible fluid based on the pipe fluid flow model. The method specifically comprises the following steps: the first characterization unit is used for performing the leakage quantity characterization of the gas medium according to the characteristics of the compressible fluid on the basis of the pipe fluid flow model; the second characterization unit is used for performing the leakage quantity characterization of the oil medium according to the characteristics of the non-compressible fluid based on the pipe fluid flow model; and the equivalent unit is used for performing equivalence on the representation of the leakage amount of the gas medium and the representation of the leakage amount of the oil medium.
And the gas pressure drop obtaining module is used for obtaining the gas pressure drop of the leakage point.
And the leakage amount calculation module is used for equivalently calculating the leakage amount of the oil liquid medium by detecting the gas pressure drop of a leakage point based on the equivalent characteristics of the gas medium and the liquid medium.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims (8)

1. A gas-liquid equivalent detection method for micro leakage of an aviation hydraulic pipeline is characterized by comprising the following steps:
obtaining modeling parameters, wherein the modeling parameters comprise aviation hydraulic pipeline characteristics in engineering, joint distribution conditions, existing test process specifications and required indexes;
establishing a pipe fluid flow model according to the modeling parameters;
performing equivalent characterization of the gaseous medium and the liquid medium according to characteristics of the compressible fluid and the incompressible fluid based on the pipe fluid flow model;
acquiring the gas pressure drop of a detection leakage point;
and equivalently calculating the leakage amount of the oil medium by detecting the gas pressure drop of the leakage point based on the equivalent characteristics of the gas medium and the liquid medium.
2. The aero-hydraulic line micro-leak gas-liquid equivalent detection method according to claim 1, wherein the hydraulic line characteristics include line diameter, line length, joint location, and joint leak rate.
3. The method for detecting the gas-liquid equivalence of the micro-leakage of the aviation hydraulic pipeline according to claim 1, wherein the establishing of the pipe fluid flow model according to the modeling parameters specifically comprises:
establishing a pipeline model according to the modeling parameters;
determining a calculation region for solving;
and establishing a pipe fluid flow model according to the pipeline model and the calculation area.
4. The method for detecting the gas-liquid equivalence of the micro-leakage of the aviation hydraulic pipeline according to claim 1, wherein the equivalent characterization of a gas medium and a liquid medium is performed according to the characteristics of a compressible fluid and an incompressible flow based on the pipe fluid flow model, and specifically comprises the following steps:
performing a leakage characterization of the gaseous medium according to the characteristics of the compressible fluid based on the pipe fluid flow model;
based on the pipe fluid flow model, according to the characteristics of the non-compressible fluid, performing the leakage characterization of the oil fluid medium;
and performing equivalence on the representation of the leakage amount of the gas medium and the representation of the leakage amount of the oil medium.
5. The utility model provides a little gas-liquid equivalence detecting system who leaks of aviation hydraulic line which characterized in that includes:
the parameter acquisition module is used for acquiring modeling parameters, wherein the modeling parameters comprise aviation hydraulic pipeline characteristics, joint distribution conditions, existing test process specifications and required indexes in engineering;
the modeling module is used for establishing a pipe fluid flow model according to the modeling parameters;
the equivalent characterization module is used for performing equivalent characterization on the gas medium and the liquid medium according to the characteristics of the compressible fluid and the non-compressible fluid on the basis of the pipe fluid flow model;
the gas pressure drop acquisition module is used for acquiring the gas pressure drop of the leakage point;
and the leakage amount calculation module is used for equivalently calculating the leakage amount of the oil liquid medium by detecting the gas pressure drop of a leakage point based on the equivalent characteristics of the gas medium and the liquid medium.
6. The aero-hydraulic line micro-leak gas-liquid equivalent detection system according to claim 5, wherein the hydraulic line characteristics include line diameter, line length, joint location, and joint leak rate.
7. The system for detecting the gas-liquid equivalence of the micro-leakage of the aviation hydraulic pipeline according to claim 5, wherein the modeling module specifically comprises:
the first modeling unit is used for establishing a pipeline model according to the modeling parameters;
a determination unit configured to determine a solution calculation region;
and the second modeling unit is used for establishing a pipe fluid flow model according to the pipeline model and the calculation area.
8. The system for detecting the gas-liquid equivalence of the micro-leakage of the aviation hydraulic pipeline according to claim 5, wherein the equivalence characterization module specifically comprises:
the first characterization unit is used for performing the leakage quantity characterization of the gas medium according to the characteristics of the compressible fluid on the basis of the pipe fluid flow model;
the second characterization unit is used for performing the leakage quantity characterization of the oil medium according to the characteristics of the non-compressible fluid based on the pipe fluid flow model;
and the equivalent unit is used for performing equivalence on the representation of the leakage amount of the gas medium and the representation of the leakage amount of the oil medium.
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CN114295299A (en) * 2021-11-19 2022-04-08 华能核能技术研究院有限公司 Method for monitoring spiral heat transfer pipe of steam generator of high-temperature gas cooled reactor
CN117556740A (en) * 2024-01-10 2024-02-13 水利部交通运输部国家能源局南京水利科学研究院 Method for calculating flight path of jet cooling liquid drop

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