CN116401968A - Axial equivalent scaling method for pipeline and pipe network - Google Patents

Axial equivalent scaling method for pipeline and pipe network Download PDF

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CN116401968A
CN116401968A CN202310297188.XA CN202310297188A CN116401968A CN 116401968 A CN116401968 A CN 116401968A CN 202310297188 A CN202310297188 A CN 202310297188A CN 116401968 A CN116401968 A CN 116401968A
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pipeline
test
short
fluid
equivalent scaling
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张政
张斌
杜卡帅
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Jiangnan Shipyard Group Co Ltd
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Jiangnan Shipyard Group Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • G06F30/28—Design optimisation, verification or simulation using fluid dynamics, e.g. using Navier-Stokes equations or computational fluid dynamics [CFD]
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/18—Network design, e.g. design based on topological or interconnect aspects of utility systems, piping, heating ventilation air conditioning [HVAC] or cabling
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2113/00—Details relating to the application field
    • G06F2113/08—Fluids
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2113/00—Details relating to the application field
    • G06F2113/14—Pipes
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation

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Abstract

The invention provides an axial equivalent scaling method for a pipeline and a pipe network, which comprises the steps of performing fluid simulation calculation on a long pipeline through CFD and verifying a calculation result; shortening the long pipeline into a short pipeline and performing the same fluid simulation calculation, changing the calculation domain into a porous medium region and adjusting the resistance coefficient of the porous medium region to ensure that the calculation results of the short pipeline and the long pipeline are consistent; and (3) constructing a test bench, and verifying the calculation result of the short pipeline to determine the equivalent short pipeline. The method is simple and convenient to implement, can verify the simulation calculation result for a plurality of times, is safe and reliable, is suitable for fluids such as fuel and the like, and has wide application range. The axial equivalent scaling method of the pipeline is applied to the pipe network system to form the axial equivalent scaling method of the pipe network, and the axial equivalent scaling method is applied to test benches such as the fuel system, so that the occupied area of the test benches can be reduced, the investment of test resources is reduced, the test difficulty and cost are reduced, the test period is shortened, the test efficiency of series washing and the like is improved, and a guarantee is provided for the smooth completion of engineering nodes.

Description

Axial equivalent scaling method for pipeline and pipe network
Technical Field
The invention relates to the field of pipeline system manufacturing and test, in particular to an axial equivalent scaling method for pipelines and pipe networks.
Background
The fuel system pipe network of the ship has very complex composition, and can be divided into a supply pipeline, an oil adding pipeline, an oil connecting pipeline, an oil discharging pipeline, an overflow pipeline, a dirty oil pipeline, a sampling pipeline and the like according to different functions of the system pipeline. The fuel cleanliness requirements are stringent due to the particularities of the fuel use. In the ship construction stage, particularly in the manufacturing and welding process of the fuel system pipeline, welding residue particles, dust and other pollutants are inevitably generated in the system pipeline.
Currently, solutions commonly employed for the removal of fuel system contaminants are: 1) The direct series washing oil-throwing method is characterized in that a large-scale series washing oil-throwing test is directly carried out on a pipeline of a real ship fuel system, and a large amount of resources and time are thrown until pollutants in a pipeline network of the fuel system are washed cleanly; 2) Setting up an approximate test bed, forming a smaller fuel system by selecting a plurality of pipelines (with the same geometric dimensions) in a typical pipeline section, performing a series washing oil-throwing test, developing an oil-throwing utility test of the fuel system, and further searching relevant experience data; 3) The CFD (computational fluid dynamics) simulation method is adopted, and a finite element method is generally adopted to discretize a pipe network, so that a continuous infinite degree of freedom problem is changed into a discrete finite degree of freedom problem, and finally, the aim of simulating the flow characteristics of pollutants in a fuel system pipeline by means of a computer is fulfilled.
The above methods all have respective drawbacks: 1) The pollution removal cost is overlarge, a large amount of fuel oil and time are needed, and the influence on the construction period of the ship is great; 2) Part of typical pipelines are longer, so that the occupied area of the test bench is larger and the cost is too high; 3) The length of the real ship pipe network is too large, the configuration requirement on a computer is extremely high, the types and the sizes of pollutants are different, and the CFD simulation method cannot accurately simulate the motion state of the pollutants in the pipeline. Therefore, the axial equivalent scaling method for the pipeline and the pipe network is provided, and the equivalent shortening of the length of the pipeline is necessary.
Disclosure of Invention
In view of the shortcomings of the prior art, the invention aims to provide an axial equivalent scaling method for pipelines and pipe networks, which is used for solving the problems of large occupied area of a test bed, more test consumables, high test cost, large test difficulty, long time consumption and the like caused by overlong lengths of the pipelines and the pipe networks in the prior art.
To achieve the above and other related objects, the present invention provides an axial equivalent scaling method of a pipe, which at least includes:
s101, establishing a geometric model of a long pipeline and performing fluid simulation calculation to obtain a first average pressure difference delta P1 between an inlet section and an outlet section of the long pipeline, and performing correctness verification on the first average pressure difference delta P1 to determine a fluid simulation calculation method;
s102, shortening the long pipeline to obtain a short pipeline, establishing a geometric model of the short pipeline, performing corresponding fluid simulation calculation, changing a calculation domain into a porous medium area, and adjusting a resistance coefficient of the porous medium area to enable a second average pressure difference delta P2 between an inlet section and an outlet section of the short pipeline to be consistent with the first average pressure difference delta P1;
s103, building a test bench, selecting the short pipeline, setting a throttling orifice plate corresponding to a resistance coefficient in the short pipeline, obtaining a test pressure difference delta P3 between an inlet section and an outlet section of the short pipeline, and comparing and verifying the test pressure difference delta P3 with the second average pressure difference delta P2 to determine an equivalent short pipeline.
Preferably, the method further comprises the step of performing calculation pretreatment before performing fluid simulation calculation on the long pipeline, and the specific arrangement is as follows: the calculation domain is set as the fluid area in the long pipeline, the inlet boundary condition is set as a speed inlet, the outlet boundary condition is set as a pressure outlet, the wall surface is set as a static non-slip wall surface boundary condition, and the fluid material property is set.
Preferably, the fluid velocity of the velocity inlet is obtained from the reynolds number calculation formula re=pvd/μ, where reynolds number Re is greater than 4000, ρ is the fluid density, v is the fluid velocity, μ is the fluid viscosity coefficient.
Preferably, before the first average pressure difference Δp1 is obtained, a step of performing a grid independence check on the fluid simulation calculation result is further included.
Preferably, the first average pressure difference Δp1 is validated using a conduit pressure drop empirical formula Δp=λlρv 2 (2d) -1 Where λ is the coefficient of resistance of the pipe, L is the pipe length, ρ is the fluid density, v is the fluid velocity, and d is the pipe diameter.
Preferably, the shortening method shortens the length of the long pipeline by keeping the pipe diameter unchanged.
Preferably, the length of the short pipeline is L, wherein L is equal to or greater than 5d, and d is the diameter of the long pipeline.
Preferably, the test bench comprises an oil tank, a first stop valve, a filter, an oil pump, a stop check valve, a regulating valve, a first pressure sensor, a test pipeline, a second pressure sensor, a flowmeter, a second stop valve and a third stop valve, wherein the first stop valve, the filter, the oil pump, the stop check valve, the regulating valve, the first pressure sensor, the test pipeline, the second pressure sensor, the flowmeter and the second stop valve are sequentially communicated with the oil tank, the second stop valve is connected to the oil tank, and the third stop valve is located behind the stop check valve and is directly communicated with the oil tank.
Preferably, the regulating valve, the first pressure sensor, the test pipeline, the second pressure sensor and the flowmeter are a test group, and at least two test groups are communicated in the test bed in parallel.
Preferably, the first pressure sensor and the second pressure sensor are correspondingly positioned at the same position of the section of the test pipeline.
The invention also provides an axial equivalent scaling method of the pipe network, which adopts any one of the axial equivalent scaling methods of the pipes to equivalently scale the typical pipe into a short pipe, and forms a pipe network system by using the short pipe.
As described above, the axial equivalent scaling method for the pipeline and the pipe network has the following beneficial effects: according to the axial equivalent scaling method of the pipeline, fluid simulation calculation is carried out on a typical long pipeline through a CFD method, and a simulation calculation result is verified; then shortening the long pipeline into a short pipeline, performing fluid simulation calculation on the short pipeline by adopting the same simulation calculation method through a CFD method, changing a calculation domain model into a porous medium model, and adjusting the resistance coefficient of the porous medium to ensure that the simulation calculation result, such as corresponding average pressure difference, of the short pipeline is identical to that of the long pipeline; and (3) building a test bed, and verifying the simulation calculation result of the short pipeline to determine the equivalent short pipeline. The method is simple and convenient to implement, the simulation calculation result of each time is verified for multiple times, the use process is safe and reliable, and the long pipeline can be equivalently shortened into a short pipeline, so that the occupied area of the pipeline is effectively reduced, and the construction cost is reduced; the method is suitable for fluids such as fuel and the like, and has wide application range.
The axial equivalent scaling method of the pipe network adopts the axial equivalent scaling method of the pipe to equivalently scale typical pipes in a pipe network system into short pipes, and the short pipes are used for constructing a new pipe network system. The axial equivalent scaling method of the pipe network is applied to the test bed of the fuel system and the like, so that the occupied area of the test bed is reduced, the investment of test resources is reduced, the test difficulty and the test cost are reduced, the test period of site series washing operation and the like is shortened, the test efficiency of series washing of the test bed of the fuel system and the like is improved, and the guarantee is provided for the smooth completion of engineering nodes.
Drawings
FIG. 1 is a flow chart of an axial equivalent scaling method of a pipeline according to the present invention.
Fig. 2 is a schematic diagram of a test bench according to an axial equivalent scaling method of a pipeline according to an embodiment of the invention.
Description of element reference numerals
210. Oil tank
220. First stop valve
230. Filter device
240. Oil pump
250. Stop check valve
261. Regulating valve
262. First pressure sensor
263. Test pipeline
264. Second pressure sensor
265. Flowmeter for measuring flow rate
270. Second stop valve
280. Third stop valve
290. Pipeline
S101 to S103 steps
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention.
As described in detail in the embodiments of the present invention, the cross-sectional view of the device structure is not partially enlarged to a general scale for convenience of explanation, and the schematic drawings are only examples, which should not limit the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in actual fabrication.
It should be noted that, the illustrations provided in the present embodiment merely illustrate the basic concept of the present invention by way of illustration, and only the components related to the present invention are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of each component in actual implementation may be changed at will, and the layout of the components may be more complex.
Example 1
As shown in fig. 1, the invention provides an axial equivalent scaling method of a pipeline, which at least comprises the following steps:
s101, establishing a geometric model of a long pipeline and performing fluid simulation calculation to obtain a first average pressure difference delta P1 between an inlet section and an outlet section of the long pipeline, and performing correctness verification on the first average pressure difference delta P1 to determine a fluid simulation calculation method.
Specifically, a three-dimensional geometric model of a long pipeline with a corresponding caliber of a typical pipeline section is established by referring to pipeline system parameters, and the three-dimensional geometric model of the long pipeline is led into CFD. Firstly, performing calculation pretreatment, namely selecting a fluid area in the long pipeline as a calculation domain, performing grid division and setting the grid number, selecting a speed inlet by an inlet boundary condition and setting the inlet speed, selecting a pressure outlet by an outlet boundary condition, and setting the fluid material property by a wall surface which is a static non-sliding wall surface boundary condition. And then performing fluid simulation calculation, and obtaining a calculation result after convergence. And (5) keeping other settings unchanged, changing the number of grids, carrying out fluid simulation operation again, and obtaining a calculation result again. And comparing the calculation results of two or more times to finally obtain a calculation result which does not change along with the change of the number of the grids, namely, the calculation result passes through grid independence check, thereby ensuring the accuracy of fluid simulation calculation. In the comparison process, if the calculation results are inconsistent, the calculation pretreatment such as changing the inlet speed and the like is required to be changed for recalculation until the calculation results pass the grid independence verification. In the embodiment, a three-dimensional geometric model of a long pipeline with the length of 10m and the diameter of 208mm is established, the inlet speed is 5m/s, the outlet pressure is 0Pa, the fluid is fuel, and when the number of grids is 40 ten thousand, 80 ten thousand and 100 ten thousand, the operation results are consistent.
It should be noted that, the inlet velocity of the fluid is set according to a reynolds number calculation formula re=ρvd/μ, where ρ, v, μ are the fluid density, the fluid velocity, and the fluid viscosity coefficient, respectively, and the reynolds number should be greater than 4000 to ensure that the flow state of all areas in the pipe is turbulent. The Reynolds number is greater than 4000 at a fluid velocity of 5 m/s.
After the calculation result is checked by grid independence, a first average pressure difference delta P1 between the inlet section and the outlet section of the long pipeline is obtained and is compared with a related empirical formula, and the correctness of the fluid simulation calculation method is verified. In this embodiment, the empirical values of the pressure drop across the pipeline are usedAnd (3) verifying the correctness of the first average pressure difference delta P1, wherein the pipeline pressure drop empirical formula is as follows: Δp=λlρv 2 (2d) -1 Where λ is the coefficient of resistance of the pipe, L is the pipe length, ρ is the fluid density, v is the fluid velocity, and d is the pipe diameter. Of course, other empirical formulas may be used for comparison verification as desired, without limitation.
S102, shortening the long pipeline to obtain a short pipeline, establishing a geometric model of the short pipeline, performing corresponding fluid simulation calculation, changing a calculation domain model into a porous medium model, and adjusting a resistance coefficient of the porous medium model to enable a second average pressure difference delta P2 between an inlet section and an outlet section of the short pipeline to be consistent with the first average pressure difference delta P1;
specifically, the pipe diameter of the long pipe is kept unchanged, the length of the long pipe is shortened to form a short pipe, a three-dimensional geometric model of the short pipe is built, grid division, material attribute giving and operation condition setting are carried out on the model according to S101, and the difference from S101 is that a calculation domain model in the boundary condition of the short pipe is a porous medium model. And after the operation result is converged, verifying the grid independence to obtain a second average pressure difference delta P2 between the inlet section and the outlet section of the short pipe. The drag coefficient of the porous medium model was changed so that Δp2 was equal in value to Δp1. In this embodiment, a short pipe with a length of 2m and a diameter of 208mm is established, the calculation domain model is a porous medium model, the rest of the pretreatment modes are consistent with those of the embodiment of S101, and after verification of grid independence, the resistance coefficient of the porous medium model is adjusted so that Δp2 is equal to Δp1 in value. Of course, short pipes with the same diameter and other lengths can be established for fluid simulation calculation, and after grid independence verification, the resistance coefficient of the porous medium model is adjusted so that DeltaP 2 is equal to DeltaP 1 in value.
It should be noted that the length of the short pipe should take into account the influence of the inlet effect to ensure that the fluid flow in the short pipe is sufficiently developed, and in general, the length of the short pipe should be not less than 5 times the diameter of the corresponding long pipe.
S103, building a test bench, selecting the short pipeline, setting a throttling orifice plate corresponding to a resistance coefficient in the short pipeline, obtaining a test pressure difference delta P3 between an inlet section and an outlet section of the short pipeline, and comparing and verifying the test pressure difference delta P3 with the second average pressure difference delta P2 to determine an equivalent short pipeline.
Specifically, as shown in fig. 2, the test stand includes a fuel tank 210, a pipe 290, a shut-off valve, a filter 230, an oil pump 240, a shut-off check valve 250, a regulator valve 261, a pressure sensor, a flow meter 265, and a test pipe 263, which are in communication. In detail, the fluid may flow from the tank 210 through the pipe 290, then sequentially through the first shut-off valve 220, the filter 230, the oil pump 240, the shut-off check valve 250, the regulator valve 261, the first pressure sensor 262, the test pipe 263, the second pressure sensor 264, the flow meter 265, the second shut-off valve 270, and then back to the tank 210, or may flow through the shut-off check valve 250, then directly communicate with the tank 210 through the third shut-off valve 280. The adjusting valve 261, the first pressure sensor 262, the test pipe 263, the second pressure sensor 264, and the flow meter 265, which are sequentially connected, are one test group, and at least two test groups should be disposed and connected in parallel in the test bed. Only one test group is arranged, if the test pressure difference delta P3 and the second average pressure difference delta P2 are different, whether the test group has problems or the simulation calculation result is inconsistent with the actual result cannot be confirmed, and a plurality of groups are arranged to verify each other, so that the reliability of the axial equivalent scaling method is improved. In this embodiment, a test bench is first built, the test pipe 263 is a short pipe in S102, the length is 2m, the diameter is 208mm, a throttle plate with the same resistance coefficient as the porous medium model in S102 is added into the test pipe 263, after the oil pump 240 is started, the opening of the regulating valve 261 is adjusted, the reading of the flowmeter 265 is observed, when the reading of the flowmeter 265 meets the fluid speed of 5m/S, the values of the first pressure sensor 262 and the second pressure sensor 264 before and after the test pipe 263 are read, test pressure difference data are obtained, and compared with the calculation result in step S102, if the two values are consistent, the test pipe 263 is an equivalent short pipe.
It should be noted that, for turbulent flow in the pipe, the flow rates and pressures at different positions in the same section are different, so the arrangement positions of the first pressure sensor 262 and the second pressure sensor 264 before and after the test pipe 263 should be regarded as one point, and if the first pressure sensor 262 is located at the middle position of the front section of the test pipe 263, the second pressure sensor 264 should also be located at the middle position of the rear section of the test pipe 263, and both are located at the same position of the section relative to the test pipe 263.
It should be noted that the test bench can also be used for verifying scientificity and rationality of fuel system pipeline design, specifically, water is used for replacing oil, and flow of water in a pipeline is simulated to flow of fuel according to a principle of a similar law, so that flow characteristics of fuel in a typical pipeline are obtained, and further rationality of fuel system pipeline design is judged.
Example 2
The invention also provides an axial equivalent scaling method of the pipe network, which adopts the axial equivalent scaling method of the pipe in the embodiment 1, typical pipe sections with different lengths and different pipe diameters in the pipe network system are equivalent scaled into short pipes, and the pipe network system after the axial equivalent scaling is built by adopting the short pipes. The pipe network system with the axial equivalent scaling is applied to the test bed, so that the length of a typical pipeline in the test bed can be shortened, and finally the purposes of reducing the occupied area of the test bed and reducing the cost are achieved. The fuel pipe network system after the axial equivalent scaling is used for the series washing oil-feeding test, so that the input resources can be reduced, the series washing time can be shortened, the cost can be saved, and the series washing efficiency can be improved.
Example 1 and example 2 are preferred examples, but are not intended to limit the invention, and the axial equivalent scaling method of the pipe can also be applied to fluids other than fuel, with material properties being altered during simulation calculations; the axial equivalent scaling method of the pipe network can also be applied to other directions besides the test bed, and is not limited herein.
In summary, the invention provides an axial equivalent scaling method for pipelines and pipe networks, which comprises the steps of performing fluid simulation calculation on a typical long pipeline by a CFD method, and verifying simulation calculation results; then shortening the long pipeline into a short pipeline, performing fluid simulation calculation on the short pipeline by adopting the same simulation calculation method through a CFD method, changing a calculation domain model into a porous medium model, and adjusting the resistance coefficient of the porous medium to ensure that the simulation calculation result, such as corresponding average pressure difference, of the short pipeline is identical to that of the long pipeline; and (3) building a test bed, and verifying the simulation calculation result of the short pipeline to determine the equivalent short pipeline. The method is simple and convenient to implement, the simulation calculation result of each time is verified for multiple times, the use process is safe and reliable, and the long pipeline can be equivalently shortened into a short pipeline, so that the occupied area of the pipeline is effectively reduced, and the construction cost is reduced; the method is suitable for fluids such as fuel and the like, and has wide application range.
The axial equivalent scaling method of the pipe network adopts the axial equivalent scaling method of the pipe to equivalently scale typical pipes in a pipe network system into short pipes, and the short pipes are used for constructing a new pipe network system. The axial equivalent scaling method of the pipe network is applied to the test bed of the fuel system and the like, so that the occupied area of the test bed is reduced, the investment of test resources is reduced, the test difficulty and the test cost are reduced, the test period of site series washing operation and the like is shortened, the test efficiency of series washing of the test bed of the fuel system and the like is improved, and the guarantee is provided for the smooth completion of engineering nodes.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims (11)

1. An axial equivalent scaling method of a pipeline, which is characterized by at least comprising the following steps:
s101, establishing a geometric model of a long pipeline and performing fluid simulation calculation to obtain a first average pressure difference delta P1 between an inlet section and an outlet section of the long pipeline, and performing correctness verification on the first average pressure difference delta P1 to determine a fluid simulation calculation method;
s102, shortening the long pipeline to obtain a short pipeline, establishing a geometric model of the short pipeline, performing corresponding fluid simulation calculation, changing a calculation domain into a porous medium area, and adjusting a resistance coefficient of the porous medium area to enable a second average pressure difference delta P2 between an inlet section and an outlet section of the short pipeline to be consistent with the first average pressure difference delta P1;
s103, building a test bench, selecting the short pipeline, setting a throttling orifice plate corresponding to a resistance coefficient in the short pipeline, obtaining a test pressure difference delta P3 between an inlet section and an outlet section of the short pipeline, and comparing and verifying the test pressure difference delta P3 with the second average pressure difference delta P2 to determine an equivalent short pipeline.
2. The method of axial equivalent scaling of a pipeline according to claim 1, further comprising the step of performing a pre-calculation process prior to performing a fluid simulation calculation on the long pipeline, wherein the method is specifically configured as follows: the calculation domain is set as the fluid area in the long pipeline, the inlet boundary condition is set as a speed inlet, the outlet boundary condition is set as a pressure outlet, the wall surface is set as a static non-slip wall surface boundary condition, and the fluid material property is set.
3. The method of axially equivalent scaling of a pipeline according to claim 2, characterized in that: the fluid velocity of the velocity inlet is obtained by a Reynolds number calculation formula Re=ρvd/μ, wherein the Reynolds number Re is larger than 4000, ρ is the fluid density, v is the fluid velocity, and μ is the fluid viscosity coefficient.
4. The method of axially equivalent scaling of a pipeline according to claim 1, characterized in that: before the first average pressure difference delta P1 is obtained, the method further comprises the step of checking the grid independence of the fluid simulation calculation result.
5. The method of axially equivalent scaling of a pipeline according to claim 1, characterized in that: the correctness of the first average pressure difference delta P1 is verified by adopting a pipeline pressure drop empirical formula delta P=lambdaLρv 2 (2d) -1 Where λ is the coefficient of resistance of the pipe, L is the pipe length, ρ is the fluid density, v is the fluid velocity, and d is the pipe diameter.
6. The method of axially equivalent scaling of a pipeline according to claim 1, characterized in that: the shortening method shortens the length of the long pipeline by keeping the pipe diameter unchanged.
7. The method of axially equivalent scaling of a pipeline according to claim 1, characterized in that: the length of the short pipeline is L, wherein L is more than or equal to 5d, and d is the diameter of the long pipeline.
8. The method of axially equivalent scaling of a pipeline according to claim 1, characterized in that: the test bed comprises an oil tank, a first stop valve, a filter, an oil pump, a stop check valve, a regulating valve, a first pressure sensor, a test pipeline, a second pressure sensor, a flowmeter, a second stop valve and a third stop valve, wherein the first stop valve, the filter, the oil pump, the stop check valve, the regulating valve, the first pressure sensor, the test pipeline, the second pressure sensor, the flowmeter and the second stop valve are sequentially communicated with the oil tank, the second stop valve is connected back to the oil tank, and the third stop valve is located behind the stop check valve and is directly communicated with the oil tank.
9. The method of axially equivalent scaling of a pipeline according to claim 8, characterized in that: the regulating valve, the first pressure sensor, the test pipeline, the second pressure sensor and the flowmeter are a test group, and at least two test groups are communicated in parallel in the test bed.
10. The method of axially equivalent scaling of a pipeline according to claim 8, characterized in that: the first pressure sensor and the second pressure sensor are correspondingly positioned at the same position of the section of the test pipeline.
11. An axial equivalent scaling method of a pipe network is characterized by comprising the following steps: an axial equivalent scaling method of a pipeline according to any one of claims 1-10 is used to scale a typical pipeline equivalent to a short pipeline, and the short pipeline is used to form a pipe network system.
CN202310297188.XA 2023-03-24 2023-03-24 Axial equivalent scaling method for pipeline and pipe network Pending CN116401968A (en)

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Application Number Priority Date Filing Date Title
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CN116401968A true CN116401968A (en) 2023-07-07

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