CN106649901A - Engine supercharger volute strength analysis method - Google Patents
Engine supercharger volute strength analysis method Download PDFInfo
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- CN106649901A CN106649901A CN201510726022.0A CN201510726022A CN106649901A CN 106649901 A CN106649901 A CN 106649901A CN 201510726022 A CN201510726022 A CN 201510726022A CN 106649901 A CN106649901 A CN 106649901A
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- supercharger
- analysis method
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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
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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Abstract
The invention discloses an engine supercharger volute strength analysis method, which comprises the steps of Step 21, calculating inlet and outlet boundary conditions; Step 22, calculating the transient flow field in a supercharger volute according to the inlet and outlet boundary conditions, and obtaining the inner wall surface temperature distribution and the heat exchange coefficient distribution of the supercharger volute under the idling work condition, the full load work condition and the reverse towing work condition; Step 23, dividing a finite element mesh according to the supercharger volute mathematical model; Step 24, calculating the transient temperature distribution of the supercharger volute in the whole circulation according to the inner wall surface temperature distribution and the heat exchange coefficient distribution of the supercharger volute under the idling work condition, the full load work condition and the reverse towing work condition, wherein the circulation includes the idling work condition, the full load work condition and the reverse towing work condition; and Step 25, calculating the plastic deformation of the supercharger volute in the whole circulation on the basis of the transient temperature distribution. The method provided by the invention has the advantages that the calculation is more precise and accurate.
Description
Technical field
The present invention relates to automobile technical field, more particularly to a kind of engine supercharger spiral case intensive analysis
Method.
Background technology
Turbocharged engine system obtains increasingly extensive application in automotive field, and spiral casing of pressure booster is that supercharging is sent out
The important component of motivation system, would generally be analyzed in the design phase to its intensity.
In the prior art, finite element analysis is carried out to spiral casing of pressure booster using either simplex condition steady-state analysis method.
As shown in figure 1, in the prior art, calculated using stable state full load mode.Art methods bag
Include following step.Step S11：Spiral casing of pressure booster import and export side under full load mode is calculated by one-dimensional
Boundary's condition；Step S12：Three dimensional fluid calculating is carried out by boundary condition of one-dimensional result of calculation, is pressurized
Device spiral case internal face steady temperature and the coefficient of heat transfer (stable state is smooth)；Step S13：According to spiral casing of pressure booster
Digital-to-analogue divides finite element grid；Step S14：Calculate spiral casing of pressure booster transient Temperature Distribution under full load mode；
S15：Mechanical cycles calculating is carried out, the calculated spiral casing of pressure booster internal face temperature of three dimensional fluid and will be changed
Hot coefficient carries out thermosetting and couples with mechanical load, is calculated spiral casing of pressure booster thermal stress；S16：To calculate
The spiral casing of pressure booster thermal stress for obtaining is compared with the yield strength of spiral casing of pressure booster material, to determine that it is
It is no to meet design requirement.
Above-mentioned computational methods can be calculated and sentenced to the intensity of spiral casing of pressure booster to a certain extent
It is fixed, but find that result of determination has larger difference with practical using result or laboratory test results in practice, thus
Cause final spiral casing of pressure booster Intensity Design improper, when serious, need to develop spiral casing of pressure booster again.It is whole
For body, the computational methods are guarded relatively, in order to reach security purpose, the meaningless increase spiral casing of pressure booster of meeting
Wall thickness, causes parts quality to increase, unfavorable to whole engine quality, performance, cost.
Thus, it is desirable to have a kind of technical scheme come overcome or at least mitigate prior art drawbacks described above.
The content of the invention
Term is explained：
" full load " refers to the work that the WOT of engine, inspiratory capacity are maximum and power output is maximum
Condition.
" idling " refers to that engine operates in the case of uncharging, and only need to overcome therein parts
Frictional resistance, the operating mode of not external power output.
" towing astern " refers to that engine is idle operating mode, that is, fuel injector not oil spout, does not burn,
Engine is set to get into smooth to drive by external impetus (the such as inertia rotation of electric dynamometer, load).
" plastic deformation " is referred to if the external force acted on object is larger, when the effect of external force stops,
Caused deformation not fully disappears, and has residual deformation.
" yield strength " is the stress for instigating material to be changed into plastic deformation from elastic deformation.
It is an object of the invention to provide a kind of engine supercharger spiral case strength analysis method is overcoming or extremely
Mitigate the disadvantages mentioned above of prior art less.
For achieving the above object, the present invention provides a kind of engine supercharger spiral case strength analysis method, institute
Stating engine supercharger spiral case strength analysis method includes：
Step S21：Calculate turnover of the supercharger volute under idling operation, full load mode and towing astern operating mode
Mouth boundary condition；
Step S22：Idling operation, full load mode and towing astern work are calculated according to above-mentioned import and export boundary condition
The transient flow field in spiral casing of pressure booster under condition, under obtaining idling operation, full load mode and towing astern operating mode
Supercharger volute internal face Temperature Distribution and heat transfer coefficients distribution；
Step S23：Finite element grid is divided according to supercharger volute digital-to-analogue；
Step S24：According to the supercharger volute internal face under idling operation, full load mode and towing astern operating mode
Temperature Distribution and heat transfer coefficients distribution, calculate the transient Temperature Distribution of the spiral casing of pressure booster in whole circulation, its
Described in circulation include idling operation, full load mode and towing astern operating mode；
Step S25：The plasticity for calculating whole circulation internal supercharger spiral case based on above-mentioned transient Temperature Distribution becomes
Shape.
Preferably, in step s 25, the calculating of at least three circulations is carried out, and calculates adjacent two circulation
Under equivalent plastic deformation.
Preferably, the plastic deformation that each is circulated is evaluated, and to the equivalent modeling under adjacent two circulations
Deformation is evaluated.
Do not evaluated preferably for the result of calculation of first circulation.
Preferably, only to spiral casing of pressure booster inner surface and the plastic deformation at outside wall surface and/or equivalent moulding change
Shape is calculated and evaluated.
Preferably, in step s 24, cavity radiation Flow Field outside is applied to spiral casing of pressure booster outside wall surface top,
Apply convection current radiation Flow Field outside to spiral casing of pressure booster outside wall surface bottom.
Preferably, the engine supercharger spiral case strength analysis method further includes following step S26：
Analysis result is contrasted with result of the test, with method for optimization analysis.
Preferably, the import and export boundary condition includes inlet gas flow, outlet gas pressure and temperature.
Preferably, mesh refinement is carried out to the radius area and transitional region of spiral casing of pressure booster.
Preferably, the time cycle of the circulation each several part is identical with engine supercharger spiral case test method.
The present invention adopts multi-state transient finite element analysis method to spiral casing of pressure booster, using full load-towing astern
- idling operation circulation machinery load Analysis On The Transient Temperature method, in gas extraction system cold shock testing method
It is foundation.Because calculated with plastic material data, therefore computational accuracy is greatly improved, secondly using complete
Load-towing astern-idling Variable Condition Analysis can investigate spiral casing of pressure booster in the extremely short test period (about 5 seconds)
Cold and heat succeed each other (by full load volute maximum temperature, about 800 DEG C drop to about 100 DEG C of idling volute maximum temperature)
The plastic deformation of generation, and the deformation of the equivalent ductility under adjacent two test cycles can be evaluated, so as to divide
Analysis is more accurate.
Description of the drawings
Fig. 1 is the indicative flowchart of engine supercharger spiral case strength analysis method of the prior art.
Fig. 2 is the schematic of engine supercharger spiral case strength analysis method according to an embodiment of the invention
Flow chart.
Fig. 3 is mechanical cycles load schematic.
Specific embodiment
To make purpose, technical scheme and the advantage of present invention enforcement clearer, below in conjunction with the present invention
Accompanying drawing in embodiment, is further described in more detail to the technical scheme in the embodiment of the present invention.In accompanying drawing
In, from start to finish same or similar label represents same or similar element or with same or like function
Element.Described embodiment is a part of embodiment of the invention, rather than the embodiment of whole.Below
It is exemplary by reference to the embodiment of Description of Drawings, it is intended to for explaining the present invention, and it is not intended that
Limitation of the present invention.Based on the embodiment in the present invention, those of ordinary skill in the art are not making wound
The every other embodiment obtained under the premise of the property made work, belongs to the scope of protection of the invention.Tie below
Close accompanying drawing to be described in detail embodiments of the invention.
Present inventor has found after carefully studying：More specifically, because above-mentioned computational methods are adopted
Stable state full load mode is used, and stable state calculates the elastomeric material data for only needing to parts, it is not necessary to consider to increase
The creep of depressor material at high temperature, does not account for the specific heat of material yet, and only carries out one calculating of full load
Operating mode, operating mode is more single, larger with reality test thermal shock mode gap, therefore result of calculation and reality
Border gap is larger, and stable state calculates less due to obtaining result, therefore also relatively more single to evaluation of result mode
One, evaluation is also guarded relatively.Due to bearing high-temperature gas effect for a long time, working environment is quite severe, and increases
Temperature and Temperature Distribution are plastically deformed to it and equivalent ductility deformation effect is maximum under depressor spiral case difference operating mode.
The present invention adopts multi-state transient finite element analysis method to spiral casing of pressure booster, by detailed three-dimensional
Fluid analysis, for spiral casing of pressure booster temperature and coefficient of heat transfer border under the operating modes such as full load-towing astern-idling are provided
Condition, by the boundary condition transient state temperature field under full load-whole state of cyclic operation of towing astern-idling is calculated, and
Full load-towing astern-idling operation is carried out to spiral casing of pressure booster by boundary condition of transient state temperature field result of calculation
Whole mechanical cycles loading analysis down, finally evaluates plastic deformation and equivalent ductility deformation result, uses
Can crack in judge the spiral casing of pressure booster course of work.
As shown in Fig. 2 the method for the raising spiral casing of pressure booster finite element analysis precision of the present invention is including following
Several steps.
Step S21：Calculate turnover of the supercharger volute under idling operation, full load mode and towing astern operating mode
Mouth boundary condition；Supercharger volute full load mode, idling operation are especially calculated with one-dimensional calculation
And the import and export boundary condition under towing astern operating mode, it is simpler so as to calculate.In a preferred embodiment,
The import and export boundary condition includes inlet gas flow, outlet gas pressure and temperature, but the present invention is not limited
In this, the import and export boundary condition can also include other specification or variable.
Step S22：Transient flow field in spiral casing of pressure booster is calculated according to above-mentioned import and export boundary condition, is obtained
Supercharger volute internal face Temperature Distribution and the coefficient of heat transfer point under full load mode, idling operation and towing astern operating mode
Cloth.That is, calculating idling operation, full load mode and towing astern work according to above-mentioned import and export boundary condition
The transient flow field in spiral casing of pressure booster under condition, under obtaining idling operation, full load mode and towing astern operating mode
Supercharger volute internal face Temperature Distribution and heat transfer coefficients distribution.It is understood that booster whirlpool herein
Shell internal face Temperature Distribution refers to temperature of the fluid at closest booster internal face point in spiral casing of pressure booster
Cloth, rather than the spiral casing of pressure booster internal face Temperature Distribution of itself.
Step S23：Finite element grid is divided according to supercharger volute digital-to-analogue.Supercharger volute digital-to-analogue refers to increasing
Depressor volute Mathematical Modeling, it can have various concrete manifestation forms.In a preferred embodiment, to increasing
The radius area and transitional region of depressor spiral case carries out mesh refinement.That is, in the circle of spiral casing of pressure booster
The FEM meshing of angular zone and transitional region divides more to refine compared to other parts.This is favourable
In labor is carried out to possible weakness zone, the reliability of analysis result is improved.
Step S24：According to the full load mode temperature that supercharger volute finite element grid and Flow Field Calculation are obtained
Distribution and heat transfer coefficients distribution to calculate full load mode under spiral casing of pressure booster transient Temperature Distribution.Namely
Say, according to the supercharger volute internal face Temperature Distribution under idling operation, full load mode and towing astern operating mode and
Heat transfer coefficients distribution, calculates the transient Temperature Distribution of the spiral casing of pressure booster in whole circulation.As it was previously stated, institute
State circulation and generally include idling operation, full load mode and towing astern operating mode.Advantageously, each portion of the circulation
Divide time cycle and the test of engine supercharger spiral case of (idling operation, full load mode and towing astern operating mode)
Method is identical, can be found in Fig. 3.For example, spiral casing of pressure booster is investigated in the extremely short test period (about 5 seconds)
Cold and heat succeed each other (by full load volute maximum temperature, about 800 DEG C drop to about 100 DEG C of idling volute maximum temperature)
The plastic deformation of generation.
Step S25：Mechanical cycles calculating is carried out, is coupled with transient state temperature field in calculating process, obtained
Whole circulation internal supercharger spiral case plastic deformation and equivalent ductility deformation.That is, being based on above-mentioned transient state temperature
Degree distribution calculates the plastic deformation of whole circulation internal supercharger spiral case and equivalent ductility deformation (to be needed to calculate at least
The plastic deformation of two circulations).
Step S26：Analysis result is contrasted with result of the test, with method for optimization analysis.
Fig. 3 is mechanical cycles load schematic.According to the time cycle calculating machine load of Fig. 3.To carry
High computational accuracy, all related components materials are required to plastic material data.Mechanical load includes installing spiral shell
The exhaust back pressure of different operating modes in bolt pretightning force, supercharger volute.
Advantageously, in step s 25, the calculating of at least three circulations is carried out, and calculates adjacent two to follow
Equivalent plastic deformation under ring.
Preferably, the plastic deformation that each is circulated is evaluated, and to the equivalent modeling under adjacent two circulations
Deformation is evaluated.More specifically, the maximum plastic deformation result of each alone cycle is evaluated,
Judge it whether beyond permissible value.Equivalent plastic deformation result under adjacent two circulations is evaluated, it is judged
Whether permissible value is exceeded.If one exceeds permissible value, then judge undesirable, and deformation result number
Value maximum is weak location.
Do not evaluated preferably for the result of calculation of first circulation.To avoid in unstable work
The result of the test obtained under condition is evaluated.
In a preferred embodiment, only to spiral casing of pressure booster inner surface and the plastic deformation at outside wall surface and/
Or equivalent plastic deformation is calculated and evaluated.Calculate and evaluate so as to both simplify, can protect substantially again
Hold the accuracy or reliability for calculating and evaluating.
Preferably, in step s 24, cavity radiation Flow Field outside is applied to spiral casing of pressure booster outside wall surface top,
Apply convection current radiation Flow Field outside to spiral casing of pressure booster outside wall surface bottom.That is, it is considered to volute outside wall surface every
Heat cover affects and applies cavity radiation on outside wall surface top, for bottom does not have heat shield region to apply convection current spoke
Penetrate.The cylinder cover water jacket regional effect being connected with supercharger volute can also further be considered.
The more traditional either simplex condition steady-state analysis spiral casing of pressure booster of the present invention is compared, employ full load, idling,
Towing astern multi-state circulation machinery loading analysis, is closer to actual test conditions.To temperature field analysis aspect,
Temperature field analysis adopt transient state analyzing method, more can accurately obtain spiral casing of pressure booster temperature point under each analysis operating mode
Cloth.It is existing to supercharger volute finite element analysis computation method in terms of the material boundary condition for using is calculated
Stable state full load mode is adopted, and stable state calculates the elastomeric material data for only needing to parts, it is not necessary to examine
Consider the creep of booster material at high temperature, also do not account for the specific heat of material, this can be produced to result of calculation
Certain error；And the present invention adopts plastic material data, because plastic material needs test to obtain so that this
Invention link with experimental condition it is more tight, so as to greatly improve computational accuracy.Evaluation side to result
Face, traditional either simplex condition steady-state analysis spiral casing of pressure booster primary evaluation thermal stress, evaluation method is guarded relatively,
In order to reach security purpose, the meaningless increase spiral casing of pressure booster wall thickness of meeting causes parts quality to increase, right
Whole engine quality, performance, cost are unfavorable.Primary evaluation spiral casing of pressure booster of the present invention plastic deformation and
Equivalent ductility deformation result, due to being plastic deformation to crackle root is produced, therefore according to spiral casing of pressure booster plasticity
Whether deformation meets is required to directly judge whether it can crack, and the evaluation is compared with traditional analysis
More directly perceived also more accurate is evaluated to thermal stress.
From original boundary condition, intermediate computations, calculate and evaluate this using material data and final result
Invention analysis precision is above traditional analysis, and actual tests test result is closer to, and this is just significantly
Reduce the rate of breakdown of spiral casing of pressure booster, greatly shorten the R＆D cycle, reduce R ＆ D Cost the advantages of.
It is last it is to be noted that：Above example is only illustrating technical scheme rather than right
Its restriction.Although being described in detail to the present invention with reference to the foregoing embodiments, the ordinary skill of this area
Personnel should be understood：It still can modify to the technical scheme described in foregoing embodiments, or
Equivalent is carried out to which part technical characteristic；And these modifications or replacement, do not make relevant art side
The essence of case departs from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (10)
1. a kind of engine supercharger spiral case strength analysis method, it is characterised in that include：
Step S21：Calculate turnover of the supercharger volute under idling operation, full load mode and towing astern operating mode
Mouth boundary condition；
Step S22：Idling operation, full load mode and towing astern work are calculated according to above-mentioned import and export boundary condition
The transient flow field in spiral casing of pressure booster under condition, under obtaining idling operation, full load mode and towing astern operating mode
Supercharger volute internal face Temperature Distribution and heat transfer coefficients distribution；
Step S23：Finite element grid is divided according to supercharger volute digital-to-analogue；
Step S24：According to the supercharger volute internal face under idling operation, full load mode and towing astern operating mode
Temperature Distribution and heat transfer coefficients distribution, calculate the transient Temperature Distribution of the spiral casing of pressure booster in whole circulation, its
Described in circulation include idling operation, full load mode and towing astern operating mode；
Step S25：The plasticity for calculating whole circulation internal supercharger spiral case based on above-mentioned transient Temperature Distribution becomes
Shape.
2. engine supercharger spiral case strength analysis method as claimed in claim 1, it is characterised in that
In step s 25, the calculating of at least three circulations is carried out, and calculates the equivalent moulding change under adjacent two circulation
Shape.
3. engine supercharger spiral case strength analysis method as claimed in claim 2, it is characterised in that
The plastic deformation that each is circulated is evaluated, and the equivalent plastic deformation under adjacent two circulations is commented
Valency.
4. engine supercharger spiral case strength analysis method as claimed in claim 2, it is characterised in that
For the result of calculation of first circulation is not evaluated.
5. the engine supercharger spiral case strength analysis method as any one of claim 1-4, its
It is characterised by, only to spiral casing of pressure booster inner surface and the plastic deformation at outside wall surface and/or equivalent plastic deformation
Calculated and evaluated.
6. the engine supercharger spiral case strength analysis method as any one of claim 1-4, its
It is characterised by, in step s 24, cavity radiation Flow Field outside is applied to spiral casing of pressure booster outside wall surface top, it is right
Spiral casing of pressure booster outside wall surface bottom applies convection current radiation Flow Field outside.
7. engine supercharger spiral case strength analysis method as claimed in claim 1, it is characterised in that
Further include following step S26：Analysis result is contrasted with result of the test, with method for optimization analysis.
8. engine supercharger spiral case strength analysis method as claimed in claim 1, it is characterised in that
The import and export boundary condition includes inlet gas flow, outlet gas pressure and temperature.
9. engine supercharger spiral case strength analysis method as claimed in claim 1, it is characterised in that
Mesh refinement is carried out to the radius area and transitional region of spiral casing of pressure booster.
10. engine supercharger spiral case strength analysis method as claimed in claim 1, it is characterised in that
The time cycle of the circulation each several part is identical with engine supercharger spiral case test method.
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| CN112109516A (en) * | 2019-06-19 | 2020-12-22 | 北汽福田汽车股份有限公司 | Vehicle fault prompt output method and device, storage medium and vehicle-mounted terminal |
| CN114459941A (en) * | 2021-12-29 | 2022-05-10 | 宁波职业技术学院 | Method and system for predicting cracking risk of stator part in exhaust system |
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| CN112109516A (en) * | 2019-06-19 | 2020-12-22 | 北汽福田汽车股份有限公司 | Vehicle fault prompt output method and device, storage medium and vehicle-mounted terminal |
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| CN114459941A (en) * | 2021-12-29 | 2022-05-10 | 宁波职业技术学院 | Method and system for predicting cracking risk of stator part in exhaust system |
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