CN112784507A - Method for establishing full three-dimensional coupling model for simulating internal fuel flow of high-pressure common rail pump - Google Patents
Method for establishing full three-dimensional coupling model for simulating internal fuel flow of high-pressure common rail pump Download PDFInfo
- Publication number
- CN112784507A CN112784507A CN202110145190.6A CN202110145190A CN112784507A CN 112784507 A CN112784507 A CN 112784507A CN 202110145190 A CN202110145190 A CN 202110145190A CN 112784507 A CN112784507 A CN 112784507A
- Authority
- CN
- China
- Prior art keywords
- fuel
- pressure
- establishing
- coupling model
- dimensional
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 100
- 238000010168 coupling process Methods 0.000 title claims abstract description 81
- 230000008878 coupling Effects 0.000 title claims abstract description 79
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 43
- 239000012530 fluid Substances 0.000 claims abstract description 15
- 230000008859 change Effects 0.000 claims description 12
- 230000005540 biological transmission Effects 0.000 claims description 4
- 230000000875 corresponding effect Effects 0.000 claims description 3
- 238000013178 mathematical model Methods 0.000 claims description 3
- 230000002596 correlated effect Effects 0.000 claims description 2
- 238000004088 simulation Methods 0.000 abstract description 19
- 230000008569 process Effects 0.000 description 12
- 238000004364 calculation method Methods 0.000 description 10
- 238000002347 injection Methods 0.000 description 8
- 239000007924 injection Substances 0.000 description 8
- 239000000295 fuel oil Substances 0.000 description 7
- 239000003921 oil Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000004401 flow injection analysis Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 230000005514 two-phase flow Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Images
Classifications
-
- 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
- G06F30/17—Mechanical parametric or variational design
-
- 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
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/08—Thermal analysis or thermal optimisation
-
- 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
Abstract
The invention belongs to the technical field of high-pressure common rail systems, and discloses a method for establishing a full three-dimensional coupling model for simulating the flow of fuel in a high-pressure common rail pump, which comprises the following steps: s1, establishing a three-dimensional geometric model according to the structure of the high-pressure common rail pump and the fuel flow area; s2, carrying out block network division on the three-dimensional geometric model; s3, establishing a first coupling model of fuel density rho along with changes of pressure P and temperature T; s4, establishing a second coupling model of the fuel viscosity mu changing along with the pressure P and the temperature T; and S5, coupling the coupling model I and the coupling model II with a flow control equation to obtain a full three-dimensional coupling model. The model building method is wider in application range, is suitable for the flow of different fuel types and even other non-Newtonian fluid media, and meanwhile, compared with the existing model, the obtained numerical simulation result has higher accuracy, and can more accurately analyze the volumetric efficiency and cavitation of the fuel in the high-pressure common rail pump body and the overall structural performance of the pump body.
Description
Technical Field
The invention relates to the technical field of high-pressure common rail systems, in particular to a method for establishing a full three-dimensional coupling model for simulating the flow of fuel in a high-pressure common rail pump.
Background
The high-pressure common rail fuel injection system is an advanced technology of a modern electronic control fuel injection system, and in order to meet the increasingly strict emission law requirements and the increasingly severe energy crisis, the requirements of a fuel engine on the fuel system are increasingly improved, so that the fuel engine can meet higher economy, comfort and durability.
The high-pressure common rail pump is an important core component in a high-pressure common rail fuel injection system, and is very critical to improving and enhancing the fuel injection performance. At present, along with the continuous increase of the pressure of the common rail, higher requirements are provided for the output pressure, the volume efficiency and the control of the fuel injection rule in the pump body. The overall performance of the common rail fuel injection system is directly influenced by the flowing condition of high-pressure fuel in the pump body. In the process of high-pressure fuel flow, the flow field inside the pump body is complex and changeable, problems such as severe pressure fluctuation, cavitation and the like exist, the fuel flow can be converted into gas-liquid two-phase flow from liquid single-phase flow, the flow separation existing at the position of a suddenly contracted flow channel can form a local vortex area and the like, and the physical phenomena such as vibration, cavitation erosion, fatigue damage and the like caused by the local vortex area can seriously affect the final injection efficiency of the fuel. The numerical simulation of the three-dimensional flow is an important scientific means for researching the practical problem of the project, and has important guiding significance for researching the three-dimensional flow field coupling method of the variable-density and variable-viscosity fuel which is more in line with the practical conditions by taking the high-pressure fuel with fixed density and fixed viscosity as a research object in the aspect of three-dimensional simulation of the flow of the fuel.
Disclosure of Invention
The invention aims to provide a method for establishing a full three-dimensional coupling model for simulating the flow of fuel oil in a high-pressure common rail pump, so as to accurately predict and analyze the three-dimensional flow rules of fuel oil with different models and other novel fuels in a pump body.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for establishing a full three-dimensional coupling model for simulating the flow of fuel in a high-pressure common rail pump comprises the following steps:
s1, establishing a three-dimensional geometric model according to the structure of the high-pressure common rail pump and the fuel flow area;
s2, carrying out block network division on the three-dimensional geometric model;
s3, establishing a first coupling model of fuel density rho along with changes of pressure P and temperature T;
s4, establishing a second coupling model of the fuel viscosity mu changing along with the pressure P and the temperature T;
and S5, coupling the coupling model I and the coupling model II with a flow control equation to obtain a full three-dimensional coupling model.
Preferably, the step of S1, establishing a three-dimensional geometric model according to the structure of the high pressure common rail pump and the fuel flow area, includes:
deleting a structure which does not relate to fuel flow in the high-pressure common rail pump, and establishing a complete geometric model by taking the innermost wall surface as a flow boundary;
and (4) replacing the complex structure according to an approximate regular geometric structure.
Preferably, the step of S2, dividing the three-dimensional geometric model into blocks and networks includes:
for symmetrical structures, a rotating or vertically stretched structured grid is used;
for asymmetric structures, a tetrahedral unstructured grid is employed.
Preferably, the step of S3, establishing a first coupling model of the fuel density ρ varying with the pressure P and the temperature T, includes:
and the fuel density rho-pressure P-temperature T relational expression is adopted, and the fuel density rho-pressure P-temperature T relational expression and the instantaneous grid node information in the fluid domain are coupled in a correlated manner through a custom function interface of fluid simulation software.
Preferably, the relational expression of the fuel density ρ -pressure P-temperature T is as follows:
ρ(P,T)＝k1+k2(T-T0)+k3(P-P0)+k4(P-P0)2+k5(T-T0)2+k6(P-P0)(T-T0)
wherein, T0And P0Respectively ambient temperature and standard atmospheric pressure, k1、k2、k3、k4、k5And k6Are all constants.
Preferably, the step of S4, establishing a second coupling model of the fuel viscosity μ with the pressure P and the temperature T includes:
and the fuel viscosity mu-pressure P-temperature T relational expression is adopted, and the fuel viscosity mu-pressure P-temperature T relational expression and the instantaneous grid node information in the fluid domain are coupled through a custom function interface of fluid simulation software.
Preferably, the relational expression of the fuel viscosity mu-pressure P-temperature T is as follows:
Z＝α/[5.1×10-9(lnμ0+9.67)]；
S＝βS(T0-138)/(lnμ0+9.67)；
α＝[0.612+0.984ln(1000μ0)]×10-8；
wherein Z is a viscosity-pressure coefficient, S is a viscosity-temperature coefficient, μ0Is the viscosity, beta, of the fuel at one atmosphere and ambient temperature T0sThe value range of (A) is 0.03-0.061.
Preferably, the step S5 of obtaining a full three-dimensional coupling model by coupling the first coupling model and the second coupling model with a flow control equation includes:
coupling mathematical models of fuel density rho and viscosity mu changing along with pressure P and temperature T with node information of pressure terms and temperature terms obtained by dispersing N-S (Navier-Stokes) equations, performing data transmission and mutual iteration through corresponding nodes in a three-dimensional space, and solving a coupled flow control equation.
Preferably, the step S5 of obtaining a full three-dimensional coupling model by coupling the first coupling model and the second coupling model with a flow control equation further includes:
and verifying and checking the precision of the full three-dimensional coupling model.
Preferably, if the accuracy does not meet the requirement, the steps S2-S5 are repeated until the accuracy meets the requirement.
The invention has the beneficial effects that: eliminating the influence of density change on a simulation result, adopting a theoretical relational expression of fuel density and viscosity-pressure-temperature to perform correlation coupling with instantaneous grid node information in a fluid domain, and adopting an initial condition, a boundary condition and a proper turbulence model which are consistent with an actual condition to realize a three-dimensional flow simulation process of changing the fuel density and the viscosity transient change so as to obtain a fuel flow rule in the pump body.
Drawings
Fig. 1 is a flowchart of a method for establishing a full three-dimensional coupling model for simulating the flow of fuel in a high-pressure common rail pump according to an embodiment of the present application.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
The invention provides a full three-dimensional coupling model establishing method for simulating the flow of fuel in a high-pressure common rail pump, which can simultaneously consider the influence of the dynamic change of the density and viscosity of the fuel on the flow behavior in the flow process of the fuel, reduce the calculation error caused by the simplification of a theoretical model and obtain a simulation result which is more similar to the actual situation.
Fig. 1 is a flowchart of a method for establishing a full three-dimensional coupling model for simulating the flow of fuel in a high-pressure common rail pump according to the embodiment, where the method includes:
and S1, establishing a three-dimensional geometric model according to the structure of the high-pressure common rail pump and the fuel flow area.
Due to the fact that the internal structure of the high-pressure common rail pump is complex, refined three-dimensional simulation of the internal fuel flow brings huge workload in geometric model building and grid node division, and meanwhile, the resource requirement for simulation calculation of the high-pressure common rail pump is extremely high. Therefore, step 1 is to simplify the geometric model of the high-pressure common rail pump.
It should be noted that, the research object of the scheme is a flow area, firstly, the structure which does not involve the fuel flow in the pump body is deleted, a complete geometric model is established by taking the innermost wall surface as a flow boundary, and meanwhile, a plurality of part structures which have little influence on the fuel flow rule in the flow area are ignored. In the process of simplifying the geometric model, complex structures such as a return spring, an armature and the like are replaced by approximate regular geometric structures, so that the simplified structures can not influence the actual flowing rule of fuel oil, the difficulty of dividing the calculation grid nodes can be greatly reduced, ideal grid quality is obtained, and the influence of the grid quality on the calculation result is eliminated.
Therefore, the step of S1 simplifies the three-dimensional geometric model, and can conveniently divide the grid nodes and greatly reduce the computing resources.
And S2, carrying out block network division on the three-dimensional geometric model.
It should be noted that, in order to ensure the accuracy of the simulation of the oil flow process in the high-pressure common rail pump, the embodiment adopts a grid node division strategy of a block grid and a combination of a structural grid and a non-structural grid.
Due to the fact that an oil way in the pump body is complex, in order to take grid quality and calculation cost into consideration, a block grid division strategy is adopted. For the symmetrical or regular structure part, including the plunger cavity, the oil inlet hole and the high-pressure oil outlet hole area, a rotary or vertical stretching structured grid is adopted; and for more complex asymmetric geometric structures such as a throttling orifice plate, a tetrahedral unstructured grid is adopted.
S3, establishing a first coupling model of the fuel density rho along with the change of the pressure P and the temperature T.
During the flowing injection process of the fuel in the pump body under high pressure, the density rho of the fuel changes along with the changes of the pressure P and the temperature T. In the process of full three-dimensional coupling simulation, in order to obtain a more accurate calculation result and eliminate the influence of density change on a simulation result, a relational expression of fuel density rho-pressure P-temperature T is adopted, and the fuel density rho-pressure P-temperature T is coupled with instantaneous grid node information in a fluid domain in a correlation mode through a custom function interface of fluid simulation software, so that the three-dimensional flow simulation process of the variable fuel density rho under a variable condition is realized.
The expression for the density ρ as a function of pressure P and temperature T is as follows:
ρ(P,T)＝k1+k2(T-T0)+k3(P-P0)+k4(P-P0)2+k5(T-T0)2+k6(P-P0)(T-T0)；
wherein, T0And P0Ambient temperature and standard atmospheric pressure, respectively. For diesel fuel, k in the above formula1、k2、k3、k4、k5And k6Are all constants. In the present embodiment, k1、k2、k3、k4、k5And k6The values of (A) are 835.698, -0.628, 0.4914, -0.00070499, 0.00073739, 0.00103633, respectively.
It is to be noted that k1、k2、k3、k4、k5And k6Can be approximately valued according to the actual working condition.
The method is characterized in that a user-defined function is applied to realize the three-dimensional flow numerical calculation of the fuel oil with the density changing along with the pressure and the temperature, and the specific program is as follows:
#include"udf.h"
DEFINE_PROPERTY(cell_density,c,t)
{
real dens,k1,k2,k3,k4,k5,k6；
real dens_0＝830.0,k1＝835.698,k2＝-0.628,k3＝0.4914,k4＝-0.00070499,k5＝0.00073739,k6＝0.00103633；
real pre＝C_P(c,t)；
real pre_0＝101325.0；
real temp＝C_T(c,t)；
real temp_0＝298.0；
dens＝k1+k2*(temp-temp_0)+k3*(pre-pre_0)+k4*(pre-pre_0)*(pre-pre_0)+k5*(temp-temp_0)*(temp-temp_0)+k6*(pre-pre_0)*(temp-temp_0)；
return dens；
}
and S4, establishing a second coupling model of the change of the fuel viscosity mu along with the pressure P and the temperature T.
It should be noted that, similar to the method of step S3, the viscosity μ of the fuel in the pump body changes with the pressure P and the temperature T during the flow injection under the high pressure. In the full three-dimensional coupling simulation process, in order to obtain a more accurate calculation result and eliminate the influence of density change on the simulation result, a theoretical relational expression of fuel viscosity mu-pressure P-temperature T is adopted, and the fuel viscosity mu-pressure P-temperature T is coupled with instantaneous grid node information in a fluid domain in a correlation mode through a custom function interface of fluid simulation software, so that the three-dimensional flow simulation process under the condition of considering the fuel viscosity change is realized.
The relational expression of the fuel viscosity mu-pressure P-temperature T is as follows:
Z＝α/[5.1×10-9(lnμ0+9.67)]；
S＝βS(T0-138)/(lnμ0+9.67)；
α＝[0.612+0.984ln(1000μ0)]×10-8；
wherein Z is a viscosity-pressure coefficient and S is a viscosity-temperature coefficientNumber, mu0To be at one atmosphere and ambient temperature T0Viscosity of the fuel, betasHas a value range of 0.03-0.061, betasThe specific value of (a) can be approximated according to the actual working condition.
The objective of establishing the numerical simulation model of the variable viscosity is still realized through a user-defined function. The specific procedure is as follows:
and S5, coupling the coupling model I and the coupling model II with a flow control equation to obtain a full three-dimensional coupling model.
It should be noted that a mathematical model of the fuel density rho and viscosity mu changing with the pressure P and the temperature T is coupled with node information of a pressure term and a temperature term obtained by dispersing an N-S (Navier-Stokes) equation by using a self-programming function, data transmission is carried out through corresponding nodes in a three-dimensional space, mutual iteration is carried out, and a flow control equation after coupling is solved. Simplifying and establishing a geometric model and dividing a computational grid through the steps S1 and S2, and performing discrete iteration on a flow control equation under variable density and variable viscosity through the steps S3-S5 to finally establish a full three-dimensional coupling model of the fuel flow in the high-pressure common rail pump body, and finally obtaining a reliable and accurate fuel flow distribution result through the dispersion of the flow control equation and the data transmission and iteration of the mass, momentum and energy of grid nodes.
Further, the method is simple. Step S5, obtaining a full three-dimensional coupling model according to the coupling between the first coupling model and the second coupling model and the flow control equation, further includes: and performing calculation simulation verification and precision check by substituting a software program, and finishing the operation if the precision meets the requirement. If the precision does not meet the requirement, the steps S2-S5 are repeated until the precision meets the requirement.
Compared with the prior art, the method for establishing the full three-dimensional coupling model for simulating the flow of the fuel in the high-pressure common rail pump has the following advantages: the method breaks through the three-dimensional flow simulation method of the fuel flow under the condition of constant density and constant viscosity commonly adopted in the existing model or method, and realizes the establishment process of the three-dimensional coupling model of the fuel flow under the condition of variable density and variable viscosity by coupling the theoretical model between the density rho and the viscosity mu-pressure P-temperature T with the flow control equation. Compared with the existing model, the model associates the instantaneous change of the temperature term and the pressure term with a continuity equation, a momentum equation and an energy equation which describe flow field information, uses the pressure value and the temperature value on an instantaneous node obtained by simulating a three-dimensional flow field as reference values for solving the density and the viscosity of the fuel at the next moment, and further uses the obtained result as the fuel physical property parameter for solving the three-dimensional flow equation at the same moment. The coupling method can not only obtain the change characteristics of the density rho and the viscosity mu of the fuel oil in the flow process, but also reveal the influence of the change of the density rho and the viscosity mu on the three-dimensional flow rule of the fuel oil in the pump body, so that the method theoretically has higher accuracy on the premise of simulating the three-dimensional flow problem of the fuel oil at the same calculation cost.
The model building method is wider in application range, is suitable for the flow of different fuel types and even other non-Newtonian fluid media, and meanwhile, compared with the existing model, the obtained numerical simulation result has higher accuracy, and can more accurately analyze the volumetric efficiency and cavitation of the fuel in the high-pressure common rail pump body and the overall structural performance of the pump body.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A method for establishing a full three-dimensional coupling model for simulating the flow of fuel in a high-pressure common rail pump is characterized by comprising the following steps of:
s1, establishing a three-dimensional geometric model according to the structure of the high-pressure common rail pump and the fuel flow area;
s2, carrying out block network division on the three-dimensional geometric model;
s3, establishing a first coupling model of fuel density rho along with changes of pressure P and temperature T;
s4, establishing a second coupling model of the fuel viscosity mu changing along with the pressure P and the temperature T;
and S5, coupling the coupling model I and the coupling model II with a flow control equation to obtain a full three-dimensional coupling model.
2. The method for establishing the full three-dimensional coupling model for simulating the fuel flow in the high-pressure common rail pump according to claim 1, wherein the step of establishing the three-dimensional geometric model according to the structure and the fuel flow area of the high-pressure common rail pump at S1 comprises the steps of:
deleting a structure which does not relate to fuel flow in the high-pressure common rail pump, and establishing a complete geometric model by taking the innermost wall surface as a flow boundary;
and (4) replacing the complex structure according to an approximate regular geometric structure.
3. The method for establishing the full three-dimensional coupling model for simulating the flow of the fuel in the high-pressure common rail pump according to claim 1, wherein the step of S2, dividing the three-dimensional geometric model into blocks and networks comprises:
for symmetrical structures, a rotating or vertically stretched structured grid is used;
for asymmetric structures, a tetrahedral unstructured grid is employed.
4. The method for establishing the full three-dimensional coupling model for simulating the fuel flow in the high-pressure common rail pump according to claim 1, wherein the step of S3 establishing the first coupling model for simulating the fuel density P along with the change of the pressure P and the temperature T comprises the following steps:
and the fuel density rho-pressure P-temperature T relational expression is adopted, and the fuel density rho-pressure P-temperature T relational expression and the instantaneous grid node information in the fluid domain are coupled in a correlated manner through a custom function interface of fluid simulation software.
5. The method for establishing the full three-dimensional coupling model for simulating the oil flow in the high-pressure common rail pump according to claim 4, wherein the relational expression of the oil density P-pressure P-temperature T is as follows:
ρ(P,T)＝k1+k2(T-T0)+k3(P-P0)+k4(P-P0)2+k5(T-T0)2+k6(P-P0)(T-T0)；
wherein, T0And P0Respectively ambient temperature and standard atmospheric pressure, k1、k2、k3、k4、k5And k6Are all constants.
6. The method for establishing the full three-dimensional coupling model for simulating the fuel flow in the high-pressure common rail pump according to claim 1, wherein the step of S4, establishing the second coupling model for simulating the fuel viscosity mu along with the changes of the pressure P and the temperature T comprises the following steps:
and the fuel viscosity mu-pressure P-temperature T relational expression is adopted, and the fuel viscosity mu-pressure P-temperature T relational expression and the instantaneous grid node information in the fluid domain are coupled through a custom function interface of fluid simulation software.
7. The method for establishing the full three-dimensional coupling model for simulating the fuel flow in the high-pressure common rail pump according to claim 6, wherein the relational expression of the fuel viscosity mu-pressure P-temperature T is as follows:
Z＝α/[5.1×10-9(lnμ0+9.67)]；
S＝βS(T0-138)/(lnμ0+9.67)；
α＝[0.612+0.984ln(1000μ0)]×10-8；
wherein Z is a viscosity-pressure coefficient, S is a viscosity-temperature coefficient, μ0To be at one atmosphere and ambient temperature T0Viscosity of the fuel, betasThe value range of (A) is 0.03-0.061.
8. The method for establishing the full three-dimensional coupling model for simulating the flow of the fuel in the high-pressure common rail pump according to claim 1, wherein the step S5 of coupling the first coupling model and the second coupling model with the flow control equation to obtain the full three-dimensional coupling model comprises the steps of:
coupling mathematical models of fuel density rho and viscosity mu changing along with pressure P and temperature T with node information of pressure terms and temperature terms obtained by dispersing N-S (Navier-Stokes) equations, performing data transmission and mutual iteration through corresponding nodes in a three-dimensional space, and solving a coupled flow control equation.
9. The method for establishing the full three-dimensional coupling model for simulating the flow of the fuel in the high-pressure common rail pump according to claim 8, wherein the step S5 of coupling the flow control equation according to the first coupling model and the second coupling model, and obtaining the full three-dimensional coupling model further comprises:
and verifying and checking the precision of the full three-dimensional coupling model.
10. The method for establishing the full three-dimensional coupling model for simulating the fuel flow in the high-pressure common rail pump according to claim 9, wherein if the precision is not satisfactory, the steps S2-S5 are repeated until the precision is satisfactory.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110145190.6A CN112784507B (en) | 2021-02-02 | 2021-02-02 | Method for establishing full three-dimensional coupling model for simulating fuel flow in high-pressure common rail pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110145190.6A CN112784507B (en) | 2021-02-02 | 2021-02-02 | Method for establishing full three-dimensional coupling model for simulating fuel flow in high-pressure common rail pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112784507A true CN112784507A (en) | 2021-05-11 |
| CN112784507B CN112784507B (en) | 2024-04-09 |
Family
ID=75760552
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110145190.6A Active CN112784507B (en) | 2021-02-02 | 2021-02-02 | Method for establishing full three-dimensional coupling model for simulating fuel flow in high-pressure common rail pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112784507B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050273244A1 (en) * | 2004-05-31 | 2005-12-08 | Stmicroelectronics S.R.L. | Soft-computing method for establishing the heat dissipation law in a diesel common rail engine |
| WO2016192077A1 (en) * | 2015-06-04 | 2016-12-08 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Method for establishing and solving numerical well-testing model of horizontal well for tight gas hydraulic fracturing |
| CN107346353A (en) * | 2017-06-05 | 2017-11-14 | 民政部零研究所 | A kind of solid burning article combustion process emulation mode and server |
| CN108170924A (en) * | 2017-12-21 | 2018-06-15 | 西安交通大学 | One kind is for Steam Generators in NPP heat transfer pipe plug stream condition model method for building up |
| CN108361138A (en) * | 2018-01-29 | 2018-08-03 | 中国第汽车股份有限公司 | High-pressure common-rail pipe flow-limiting valve diagnosis detecting method and device |
| CN111079308A (en) * | 2019-12-30 | 2020-04-28 | 哈尔滨工程大学 | Two-stage plunger booster type common rail fuel oil system simulation method for marine low-speed machine |
| CN111881516A (en) * | 2020-07-17 | 2020-11-03 | 南京依维柯汽车有限公司 | Independent fuel oil warm air whole vehicle water flow distribution line model establishing and analyzing method |
| WO2020224539A1 (en) * | 2019-05-06 | 2020-11-12 | 西安华线石油科技有限公司 | Flow simulation and transient well analysis method based on generalized pipe flow seepage coupling |
| CN111997805A (en) * | 2020-08-28 | 2020-11-27 | 一汽解放汽车有限公司 | Common rail device and high-pressure common rail fuel injection system |
-
2021
- 2021-02-02 CN CN202110145190.6A patent/CN112784507B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050273244A1 (en) * | 2004-05-31 | 2005-12-08 | Stmicroelectronics S.R.L. | Soft-computing method for establishing the heat dissipation law in a diesel common rail engine |
| WO2016192077A1 (en) * | 2015-06-04 | 2016-12-08 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Method for establishing and solving numerical well-testing model of horizontal well for tight gas hydraulic fracturing |
| CN107346353A (en) * | 2017-06-05 | 2017-11-14 | 民政部零研究所 | A kind of solid burning article combustion process emulation mode and server |
| CN108170924A (en) * | 2017-12-21 | 2018-06-15 | 西安交通大学 | One kind is for Steam Generators in NPP heat transfer pipe plug stream condition model method for building up |
| CN108361138A (en) * | 2018-01-29 | 2018-08-03 | 中国第汽车股份有限公司 | High-pressure common-rail pipe flow-limiting valve diagnosis detecting method and device |
| WO2020224539A1 (en) * | 2019-05-06 | 2020-11-12 | 西安华线石油科技有限公司 | Flow simulation and transient well analysis method based on generalized pipe flow seepage coupling |
| CN111079308A (en) * | 2019-12-30 | 2020-04-28 | 哈尔滨工程大学 | Two-stage plunger booster type common rail fuel oil system simulation method for marine low-speed machine |
| CN111881516A (en) * | 2020-07-17 | 2020-11-03 | 南京依维柯汽车有限公司 | Independent fuel oil warm air whole vehicle water flow distribution line model establishing and analyzing method |
| CN111997805A (en) * | 2020-08-28 | 2020-11-27 | 一汽解放汽车有限公司 | Common rail device and high-pressure common rail fuel injection system |
Non-Patent Citations (4)
| Title |
|---|
| LEILEI XU, ET AL: "Experimental and modeling study of liquid fuel injection and combustion in diesel engines with a common rail injection system", APPLIED ENERGY, vol. 230, pages 287 - 304, XP085493771, DOI: 10.1016/j.apenergy.2018.08.104 * |
| 何志霞;王芬;刘菊燕;蒋兆晨;王谦;: "柴油机喷嘴结构对喷雾特性影响的耦合模拟研究", 机械工程学报, no. 24, pages 36 - 45 * |
| 洪恩哲等: "柴油机燃油喷射系统流体动力学研究进展", 车用发动机, no. 04, pages 1 - 7 * |
| 陈玉涛等: "基于多场耦合的共轨喷油器温度场仿真分析", 系统仿真学报, vol. 31, no. 07, pages 1334 - 1341 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112784507B (en) | 2024-04-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112446177B (en) | Simulation method for heat insulation performance of external heat insulation material of high-temperature carbonization furnace | |
| CN104123414A (en) | Parameterization method for optimization of air intake and exhaust channel flow field and heat transfer of pneumatic engine | |
| CN108762110A (en) | A kind of electric controlled motorcycle engine matching and calibration method meeting IV standard of state | |
| CN115659908A (en) | Three-unit unbalanced porous medium method of printed circuit board heat exchanger | |
| CN106874566B (en) | A kind of electronics optimum structure design method | |
| CN114151139A (en) | Method for simulating flow of air film hole cold air layer on surface of turbine blade by adopting permeation model | |
| Chen et al. | Study on cavitation phenomenon of twin-tube hydraulic shock absorber based on CFD | |
| CN112784507A (en) | Method for establishing full three-dimensional coupling model for simulating internal fuel flow of high-pressure common rail pump | |
| CN110909510B (en) | Three-dimensional simulation method for pressure pulsation attenuator | |
| CN105138766B (en) | The method of adding some points of hypersonic Aerodynamic Heating reduced-order model based on fuzzy clustering | |
| Hairong et al. | Comparison of turbulence models for multiphase-flow oscillating heat transfer enhancement | |
| Suzuki et al. | Characteristics prediction of vane pump by CFD analysis | |
| CN110543677A (en) | vortex characteristic driven rotational turbulence PANS model | |
| CN113536640B (en) | Optimization design method for internal flow channel structure of air distributor based on orthogonal test | |
| Silva et al. | Dynamic mesh analysis by numerical simulation of internal combustion engines | |
| Guardiola et al. | Representation limits of mean value engine models | |
| Yang et al. | Pitfalls for accurate steady-state port flow simulations | |
| Stern et al. | Effects of waves on the wake of a surface-piercing flat plate: experiment and theory | |
| CN111695216B (en) | Design method of heat flow coupling structure of bridge explicit-implicit topological description | |
| Linsong et al. | A numerical simulation approach for embedded discrete fracture model coupled Green element method based on two sets of nodes | |
| Duygu | Investigation on hydrodynamic characteristics of a Stirling regenerator matrix using porous media approach: a CFD study | |
| CN111852461B (en) | Method for simulating unsteady state crossflow between tight reservoir bedrock and fracture | |
| Engl | The modeling and numerical simulation of gas flow networks | |
| Theodorakakos et al. | Simulation of heating effects in cavitating flows through Diesel fuel injectors caused by extreme fuel pressurisation | |
| Angadi et al. | Modelling and Analysis of Intake manifold of a Multi-cylinder SI engine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant |