CN104794271A - Heat load analysis method for gasoline engine exhaust manifold - Google Patents
Heat load analysis method for gasoline engine exhaust manifold Download PDFInfo
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- CN104794271A CN104794271A CN201510168248.3A CN201510168248A CN104794271A CN 104794271 A CN104794271 A CN 104794271A CN 201510168248 A CN201510168248 A CN 201510168248A CN 104794271 A CN104794271 A CN 104794271A
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Abstract
The invention discloses a heat load analysis method for a gasoline engine exhaust manifold. The heat load analysis method includes the following steps that firstly, the inlet/outlet boundary conditions of an inner flow field of the exhaust manifold are worked out; secondly, the transient inner flow field of the exhaust manifold is calculated, the transient heat boundary conditions of the inner wall surface of the exhaust manifold are obtained, and the average value of the heat boundary conditions of the inner wall surface is worked out through a time averaging method; thirdly, the heat boundary conditions of the outer wall surface of the exhaust manifold are obtained by simulating the steady state outer flow field of an engine rig test; fourthly, the temperature field distribution of the surface of the exhaust manifold is worked out through FEA software; fifthly, the boundary conditions of CFD software analysis are corrected through the worked-out exhaust manifold surface temperature field distribution, a steady temperature field of the exhaust manifold is obtained through multiple times of iterative computations, and the heat stress and heat deformation of the exhaust manifold are calculated. The heat load analysis method for the gasoline engine exhaust manifold has the technical advantages of being reasonable in design, and high in analysis efficiency and accuracy.
Description
Technical field
The present invention relates to gasoline engine exhaust manifold analysis and research field, particularly relate to a kind of gasoline engine exhaust manifold thermal load analysis method.
Background technology
At present, internal combustion engine is just towards future development that is high-power, light weight, its reinforcing degree improves constantly, the thermal load of reinforcing stimulus is one of key issue in its development process, exhaust manifold is the main Heating Components of engine, it directly contacts with high-temperature fuel gas, temperature is higher, working environment is very severe, particularly due to high temperature with temperature distributing disproportionation is even and the repeated action of thermal stress that is that produce often forms heat fatigue cracking, causing it to destroy, is therefore vital to the thermal load analysis research of enmgine exhaust.
In the prior art, there is analysis efficiency and the lower technical matters of accuracy rate in existing gasoline engine exhaust manifold thermal load analysis method.
Summary of the invention
The invention provides a kind of gasoline engine exhaust manifold thermal load analysis method, solve existing gasoline engine exhaust manifold thermal load analysis method and there is analysis efficiency and the lower technical matters of accuracy rate, achieve gasoline engine exhaust manifold thermal load analysis method design reasonable, analysis efficiency and the higher technique effect of accuracy rate.
For solving the problems of the technologies described above, the embodiment of the present application provides gasoline engine exhaust manifold thermal load analysis method, and described method comprises:
First the import and export boundary condition of exhaust manifold flow field is calculated;
Then calculate exhaust manifold transient state flow field, obtain exhaust manifold internal face thermal transient boundary condition, then calculate the mean value of internal face thermal boundary condition with time average method;
And then the stable state Flow Field outside of simulated engine bench test, obtain exhaust manifold outside wall surface thermal boundary condition;
FEA software is utilized to calculate the thermo parameters method on exhaust manifold surface subsequently;
Then use the boundary condition of the exhaust manifold surface temperature field distribution correction CFD software analysis of calculating, calculated by successive ignition, obtain the temperature field that exhaust manifold is stable, and calculate its thermal stress, thermal deformation.
Further, the crank angle of described transient state flow field is 0 ~ 720 ° of CA.
Further, inner flew field adopts transient mode, and wall region adopts Standard law of wall, and turbulence model selects high Reynolds model.
Further, Flow Field outside stress and strain model adopts destructuring tetrahedral grid, and the surface that Flow Field outside contacts with engine increases boundary-layer grid.
Further, Flow Field outside calculates and adopts equilibrium mode, and wall region adopts Standard law of wall, and turbulence model selects high Reynolds model.
Further, inside and outside the exhaust manifold that CFD calculates, thermal boundary condition will be loaded on exhaust manifold finite element model, be obtained the Temperature Distribution of exhaust manifold by finite element analysis of Heat Transfer.
The one or more technical schemes provided in the embodiment of the present application, at least have following technique effect or advantage:
It is comprise owing to have employed gasoline engine exhaust manifold thermal load analysis method design: the import and export boundary condition first calculating exhaust manifold flow field; Then calculate exhaust manifold transient state flow field, obtain exhaust manifold internal face thermal transient boundary condition, then calculate the mean value of internal face thermal boundary condition with time average method; And then the stable state Flow Field outside of simulated engine bench test, obtain exhaust manifold outside wall surface thermal boundary condition; FEA software is utilized to calculate the thermo parameters method on exhaust manifold surface subsequently; Then the boundary condition of the exhaust manifold surface temperature field distribution correction CFD software analysis of calculating is used, calculated by successive ignition, obtain the temperature field that exhaust manifold is stable, and calculate the technical scheme of its thermal stress, thermal deformation, so, efficiently solve existing gasoline engine exhaust manifold thermal load analysis method and there is analysis efficiency and the lower technical matters of accuracy rate, and then it is reasonable to achieve gasoline engine exhaust manifold thermal load analysis method design, analysis efficiency and the higher technique effect of accuracy rate.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of gasoline engine exhaust manifold thermal load analysis method in the embodiment of the present application one.
Embodiment
The invention provides a kind of gasoline engine exhaust manifold thermal load analysis method, solve existing gasoline engine exhaust manifold thermal load analysis method and there is analysis efficiency and the lower technical matters of accuracy rate, achieve gasoline engine exhaust manifold thermal load analysis method design reasonable, analysis efficiency and the higher technique effect of accuracy rate.
Technical scheme during the application implements is for solving the problems of the technologies described above.General thought is as follows:
Have employed gasoline engine exhaust manifold thermal load analysis method design is comprise: the import and export boundary condition first calculating exhaust manifold flow field; Then calculate exhaust manifold transient state flow field, obtain exhaust manifold internal face thermal transient boundary condition, then calculate the mean value of internal face thermal boundary condition with time average method; And then the stable state Flow Field outside of simulated engine bench test, obtain exhaust manifold outside wall surface thermal boundary condition; FEA software is utilized to calculate the thermo parameters method on exhaust manifold surface subsequently; Then the boundary condition of the exhaust manifold surface temperature field distribution correction CFD software analysis of calculating is used, calculated by successive ignition, obtain the temperature field that exhaust manifold is stable, and calculate the technical scheme of its thermal stress, thermal deformation, so, efficiently solve existing gasoline engine exhaust manifold thermal load analysis method and there is analysis efficiency and the lower technical matters of accuracy rate, and then it is reasonable to achieve gasoline engine exhaust manifold thermal load analysis method design, analysis efficiency and the higher technique effect of accuracy rate.
In order to better understand technique scheme, below in conjunction with Figure of description and concrete embodiment, technique scheme is described in detail.
Embodiment one:
In embodiment one, provide gasoline engine exhaust manifold thermal load analysis method, please refer to Fig. 1, described method comprises:
First the import and export boundary condition of exhaust manifold flow field is calculated;
Then calculate exhaust manifold transient state flow field, obtain exhaust manifold internal face thermal transient boundary condition, then calculate the mean value of internal face thermal boundary condition with time average method;
And then the stable state Flow Field outside of simulated engine bench test, obtain exhaust manifold outside wall surface thermal boundary condition;
FEA software is utilized to calculate the thermo parameters method on exhaust manifold surface subsequently;
Then use the boundary condition of the exhaust manifold surface temperature field distribution correction CFD software analysis of calculating, calculated by successive ignition, obtain the temperature field that exhaust manifold is stable, and calculate its thermal stress, thermal deformation.
Wherein, in the embodiment of the present application, the crank angle of described transient state flow field is 0 ~ 720 ° of CA.
Wherein, in the embodiment of the present application, inner flew field adopts transient mode, and wall region adopts Standard law of wall, and turbulence model selects high Reynolds model.
Wherein, in the embodiment of the present application, Flow Field outside stress and strain model adopts destructuring tetrahedral grid, and the surface that Flow Field outside contacts with engine increases boundary-layer grid.
Wherein, in the embodiment of the present application, Flow Field outside calculates and adopts equilibrium mode, and wall region adopts Standard law of wall, and turbulence model selects high Reynolds model.
Wherein, in the embodiment of the present application, inside and outside the exhaust manifold that CFD calculates, thermal boundary condition will be loaded on exhaust manifold finite element model, be obtained the Temperature Distribution of exhaust manifold by finite element analysis of Heat Transfer.
Wherein, in the embodiment of the present application, BOOST software is first used to calculate the import and export boundary condition of exhaust manifold flow field; Then use STAR-CD to calculate exhaust manifold transient state flow field (crank angle is 0 ~ 720 ° of CA), obtain exhaust manifold internal face thermal transient boundary condition, then calculate the mean value of internal face thermal boundary condition with time average method; And then the stable state Flow Field outside of simulated engine bench test, obtain exhaust manifold outside wall surface thermal boundary condition; FEA software is utilized to calculate the thermo parameters method on exhaust manifold surface subsequently.Then use the boundary condition of the exhaust manifold surface temperature field distribution correction CFD software analysis of calculating, calculated by successive ignition, obtain the temperature field that exhaust manifold is stable, and calculate its thermal stress, thermal deformation.
Exhaust manifold inner flew field model:
Inwall near wall place adds boundary-layer grid, and inner flew field adopts transient mode, and wall region adopts Standard law of wall, and turbulence model selects high Reynolds model.
The boundary condition of exhaust manifold inner flew field: operating mode is constant engine operating mode, crank angle range is 0 ~ 720 ° of CA, accurately to determine that exhaust manifold flow field is imported and exported boundary condition and need be simulated specific model and operating mode, adopt BOOST software simulation in-cylinder process herein, draw the different crank angle inlet flow rate of exhaust manifold and temperature thus, outlet is to static pressure, and all the other are wall boundary condition.
Exhaust manifold Flow Field outside computation model:
Flow Field outside stress and strain model adopts Application comparison destructuring tetrahedral grid widely, the surface that Flow Field outside contacts with engine adds boundary-layer grid, due to the emphasis that in Flow Field outside and the surface of exhaust manifold wall contacts is computational analysis, in the partition process of grid, in order to compress lattice number, refinement has been carried out to it, and other parts, then have employed relatively thick grid.
Flow Field outside calculates and adopts equilibrium mode, and wall region adopts Standard law of wall, and turbulence model selects high Reynolds model.
The boundary condition that exhaust manifold Flow Field outside calculates: entrance is fan outlet, given inlet flow rate and temperature; The surrounding of model is symmetrical boundary condition; Outlet is to constant static-pressure; The given wall boundary condition in the surface contacted with exhaust manifold, inside and outside the exhaust manifold that CFD calculates, thermal boundary condition will be loaded on exhaust manifold finite element model, be obtained the Temperature Distribution of exhaust manifold by finite element analysis of Heat Transfer.
The temperature of whole exhaust manifold is higher, and maximum temperature reaches 541.4 DEG C, appears at exhaust branch pipe intersection; Minimum temperature is 331.2 DEG C, appears at and ring flange outer ledge, and 3 exhaust branch pipes are vented continuously successively, and exhaust branch pipe intersection can be subject to high-temp waste gas heating continuously, so temperature is higher; Ring flange is subject to high-temp waste gas heating discontinuously, so temperature is lower; Ring flange front end is towards fan end, and first can be subject to cooling-air cooling, temperature will lower than the opposite side of ring flange; The high temperature heat source not having ring flange such before 1 cylinder exhaust branch pipe, the Air flow that temperature is lower can be subject to, so temperature is lower than other two exhaust branch pipe temperature, this exhaust manifold temperature skewness, there is larger temperature difference, this just certainly leads to larger thermal stress.
Thermal stress, distortion calculate:
Exhaust manifold different piece is because of heating degree difference, Temperature Distribution has larger difference, produce thermal expansion and produce thermal stress in various degree thus, in order to analyze the impact of thermal load on exhaust manifold thermal stress, thermal deformation, calculate the thermal stress of exhaust manifold under only having temperature field to act on, thermal deformation herein.
The partial cylinders cover net lattice (it comprises whole exhaust manifold faying face feature) that computing grid comprises exhaust manifold, exhaust manifold bolt is connected with a same exhaust manifold simplified, in the calculation, establish bolt and exhaust manifold, contact boundary condition between exhaust manifold and cylinder head, during calculating, program according between surface of contact after deformation contact condition automatically carry out the transmission of contact force, complete contact simulation thus, setting end face A in calculating is fixed constraint, because calculating object is exhaust manifold, so the Planar Mechanisms of cylinder head calculates impact not quite to it.
1. thermal stress result of calculation
For exhaust manifold inside surface directly contacts with high-temperature fuel gas, directly can be subject to high-temperature fuel gas heating, temperature is higher, outside surface has the cooling of cooling-air, temperature is relatively low, and inside surface will outwards expand by after high-temperature fuel gas heating, and hull-skin temperature is much smaller compared with low bulk; Inside and outside wall retrains mutually, can not free expansion, thus produces thermal stress; The extruding that internal face is subject to outer side surface will produce compressive stress, exhaust manifold outside surface tension expands, tension will be produced, this external exhaust manifold outside wall surface exhaust branch pipe intersection temperature is higher, after expanded by heating, distortion is comparatively large, has squeezing action, alleviation outside surface is subject to tension to surrounding exhaust gas manifold outside surface; And to exhaust manifold internal face by dilatory for generation effect, alleviation inside surface is subject to compressive stress, under combined action, exhaust manifold inside surface major part region is mainly subject to action of compressive stress, outside surface major part region is mainly subject to action of pulling stress, exhaust manifold outside surface is subject to tension maximal value and reaches 80.4MPa, appears at a cylinder exhaust branch pipe and ring flange intersection.
2. Calculation of Thermal Deformation result
The temperature of whole exhaust manifold is higher, and after expanding, thermal deformation is comparatively large, and maximum heat distortion appears on the convex of ring flange front end, and its value is 1.08mm.The total trend of exhaust manifold thermal deformation is from ring flange end face to ring flange front end convex, become large successively, this is because after expanded by heating, the thermal expansion of exhaust manifold is restricted in cylinder head side direction, be then free state at opposite side, so the thermal deformation of exhaust manifold is applied to the direction of ring flange successively by No. 1 ring flange, in addition the relative own temperature of the temperature gap between each exhaust branch pipe, shared ratio is very little, after dilatational strain, on the direction of parallel ring flange end face, thermal deformation difference is very little.
The temperature of whole exhaust manifold is higher, and maximum temperature reaches 541.4 DEG C, appears at exhaust branch pipe intersection, and minimum temperature is 331.2 DEG C; Exhaust manifold inside surface major part region is mainly subject to action of compressive stress, and outside surface major part region is mainly subject to action of pulling stress, and exhaust manifold outside surface is subject to tension maximal value and reaches 80.4MPa, appears at a cylinder exhaust branch pipe ring flange intersection; The total trend of exhaust manifold thermal deformation is from ring flange end face to ring flange front end convex, becomes large successively, and maximum heat distortion appears on the convex of ring flange front end, and its value is 1.08mm.
Technical scheme in above-mentioned the embodiment of the present application, at least has following technique effect or advantage:
It is comprise owing to have employed gasoline engine exhaust manifold thermal load analysis method design: the import and export boundary condition first calculating exhaust manifold flow field; Then calculate exhaust manifold transient state flow field, obtain exhaust manifold internal face thermal transient boundary condition, then calculate the mean value of internal face thermal boundary condition with time average method; And then the stable state Flow Field outside of simulated engine bench test, obtain exhaust manifold outside wall surface thermal boundary condition; FEA software is utilized to calculate the thermo parameters method on exhaust manifold surface subsequently; Then the boundary condition of the exhaust manifold surface temperature field distribution correction CFD software analysis of calculating is used, calculated by successive ignition, obtain the temperature field that exhaust manifold is stable, and calculate the technical scheme of its thermal stress, thermal deformation, so, efficiently solve existing gasoline engine exhaust manifold thermal load analysis method and there is analysis efficiency and the lower technical matters of accuracy rate, and then it is reasonable to achieve gasoline engine exhaust manifold thermal load analysis method design, analysis efficiency and the higher technique effect of accuracy rate.
Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (6)
1. gasoline engine exhaust manifold thermal load analysis method, is characterized in that, described method comprises:
First the import and export boundary condition of exhaust manifold flow field is calculated;
Then calculate exhaust manifold transient state flow field, obtain exhaust manifold internal face thermal transient boundary condition, then calculate the mean value of internal face thermal boundary condition with time average method;
And then the stable state Flow Field outside of simulated engine bench test, obtain exhaust manifold outside wall surface thermal boundary condition;
FEA software is utilized to calculate the thermo parameters method on exhaust manifold surface subsequently;
Then use the boundary condition of the exhaust manifold surface temperature field distribution correction CFD software analysis of calculating, calculated by successive ignition, obtain the temperature field that exhaust manifold is stable, and calculate its thermal stress, thermal deformation.
2. method according to claim 1, is characterized in that, the crank angle of described transient state flow field is 0 ~ 720 ° of CA.
3. method according to claim 1, is characterized in that, inner flew field adopts transient mode, and wall region adopts Standard law of wall, and turbulence model selects high Reynolds model.
4. method according to claim 1, is characterized in that, Flow Field outside stress and strain model adopts destructuring tetrahedral grid, and the surface that Flow Field outside contacts with engine increases boundary-layer grid.
5. method according to claim 1, is characterized in that, Flow Field outside calculates and adopts equilibrium mode, and wall region adopts Standard law of wall, and turbulence model selects high Reynolds model.
6. method according to claim 1, is characterized in that, inside and outside the exhaust manifold that CFD calculates, thermal boundary condition will be loaded on exhaust manifold finite element model, be obtained the Temperature Distribution of exhaust manifold by finite element analysis of Heat Transfer.
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| CN106844898A (en) * | 2016-12-31 | 2017-06-13 | 华晨汽车集团控股有限公司 | The detection method of exhaust manifold thermal fatigue life |
| CN112696258A (en) * | 2020-12-23 | 2021-04-23 | 重汽(重庆)轻型汽车有限公司 | Control method for thermal deformation design of exhaust manifold |
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Application publication date: 20150722 |