CN106649923A - Thermal damage assessment method and device for engine exhaust system - Google Patents
Thermal damage assessment method and device for engine exhaust system Download PDFInfo
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- CN106649923A CN106649923A CN201610827461.5A CN201610827461A CN106649923A CN 106649923 A CN106649923 A CN 106649923A CN 201610827461 A CN201610827461 A CN 201610827461A CN 106649923 A CN106649923 A CN 106649923A
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
- F01N11/005—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus the temperature or pressure being estimated, e.g. by means of a theoretical model
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/15—Vehicle, aircraft or watercraft design
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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Abstract
The invention discloses a thermal damage assessment method and device for engine exhaust system. The method comprises the steps of acquiring engine exhaust parameters under set speed working condition, according to the exhaust parameters and the dimensions and structural parameters of heat source components in the exhaust system, calculating surface temperature distribution information of heat source parts, according to the location and material parameters of heat damage components, and surface temperature distribution information of the heat source components corresponding to the heat damage components, to evaluate the thermal damage components. The thermal damage assessment method and device for engine exhaust system simplifies the complex 3D CAE simulation analysis of vehicle thermal management, avoids the dilemma that in the stage without a vehicle sample, the experiment cannot be carried out, and avoids expensive experimental cost.
Description
Technical field
The present invention relates to automobile technical field, the heat evil appraisal procedure of more particularly to a kind of engine exhaust system and dress
Put.
Background technology
During vehicle use, because the delivery temperature of engine is higher, heat evil can be produced to the part around it
Problem, has a strong impact on the service life of vehicle, so in the vehicle development stage, needing to enter the part around vehicle exhaust system
Row heat evil assessment.
In correlation technique, emulated by CAE (Computer Aided Engineering, computer-aided engineering)
Analysis, but because the factors such as workload is big, time cycle length, calculating complexity cannot meet the quick analysis to heat evil problem, and
Test experiments sample car is limited the engine request that cannot meet vehicle development by timeliness, cost, cycle etc..
The content of the invention
It is contemplated that at least solving one of technical problem in correlation technique to a certain extent.
For this purpose, it is an object of the present invention to proposing a kind of heat evil appraisal procedure of engine exhaust system, the method
Simplify in vehicle heat management complicated three-dimensional CAE simulation analysis, it is to avoid the contradiction that cannot test measurement without the sample car stage,
And avoid high experimental expenses.
Further object is that proposing a kind of heat evil apparatus for evaluating of engine exhaust system.
For achieving the above object, one aspect of the present invention embodiment proposes a kind of heat evil assessment side of engine exhaust system
Method, comprises the following steps：Obtain the exhaust parameter of engine under setting speed operating mode；According to the exhaust parameter and the exhaust
The dimensional structure parameter of heat source component calculates the surface temperature distribution information of the heat source component in system；And according to hot evil portion
The surface temperature distribution information of the position of part and material parameter and heat source component corresponding with the heat evil part calculates described
The heating temperature of heat evil part, to carry out heat evil assessment to the heat evil part.
The heat evil appraisal procedure of engine exhaust system according to embodiments of the present invention, first, obtains setting speed operating mode
The exhaust parameter of lower engine, then, according to the dimensional structure parameter of heat source component in exhaust parameter and gas extraction system heat is calculated
The surface temperature distribution information of source block, finally, according to heat evil part position and material parameter and with heat evil part it is corresponding
Heat source component surface temperature distribution information calculate heat evil part heating temperature, with to heat evil part carry out heat evil assessment.
The method can not only realize the reliable assessment to heat evil part, and it is imitative to simplify three-dimensional CAE complicated in vehicle heat management
True analysis, it is to avoid cannot test the contradiction of measurement without the sample car stage, and avoid high experimental expenses.
According to one embodiment of present invention, the exhaust parameter include the exhaust system entrance at delivery temperature,
Extraction flow, pressure at expulsion and exhaust gas composition and delivery temperature, extraction flow, the pressure at expulsion in the gas extraction system exit
And exhaust gas composition.
According to one embodiment of present invention, the heat source component includes blast pipe, silencer, catalyst converter, heat shield, wind
One or more in fan, the dimensional structure parameter of the heat source component includes appearance and size, inner structure size, pipe thickness
And material property, the heat evil part is including hanger, wire harness, ABS (Antilock Brake System, braking anti-lock system
System), oil pipe, fire wall, sheath, power transmission shaft oil sealing, turn to machine, bracing wire, one or more in oil sump, the heat evil part
Material parameter include size and material property.
According to one embodiment of present invention, the surface temperature of the heat source component is calculated by thermal convection current and heat transfer formula
Degree distributed intelligence, wherein, the thermal convection current and heat transfer formula are respectively：
Wherein, q is the quantity of heat convection of exhaust and the heat source component, and h is the coefficient of heat transfer of the heat source component, tfFor
Delivery temperature, twThe surface temperature of the heat source component, φ is the heat conduction rate of the heat source component, λ1For the heat source component
Thermal conductivity factor, A1For the heat-conducting area of the heat source component,For thermograde.
According to one embodiment of present invention, the heat is calculated by radiating received heat formula and forced convertion heat release formula
The heating temperature of evil part, wherein, the radiation received heat formula and the forced convertion heat release formula are respectively：
Wherein, Q1To radiate received heat, A2For the surface area of the heat evil, d1For the length of the heat source component, d2It is described
The length of heat evil part, σ radiation constants, T1The surface temperature of the heat source component, T2For it is described heat evil part heating temperature,
F12Ascent, ε1For the emissivity of the heat source component, ε2The emissivity of the heat evil part, Q2For forced convertion thermal discharge, λ
For air conduction coefficient, U∞For the convection velocity of surrounding air, T∞For ambient temperature, υ air viscosity coefficients.
For achieving the above object, a kind of heat evil assessment of engine exhaust system that another aspect of the present invention embodiment is proposed
Device, including：Acquisition module, for obtaining setting speed operating mode under engine exhaust parameter；First computing module, for root
The surface temperature of the heat source component is calculated according to the dimensional structure parameter of heat source component in the exhaust parameter and the gas extraction system
Degree distributed intelligence；And second computing module, for according to the position of heat evil part and material parameter and with the heat evil portion
The surface temperature distribution information of the corresponding heat source component of part calculates the heating temperature of the heat evil part, with to the heat evil part
Carry out heat evil assessment.
The heat evil apparatus for evaluating of engine exhaust system according to embodiments of the present invention, first, is obtained by acquisition module
The exhaust parameter of engine under setting speed operating mode, then, the first computing module is according to thermal source in exhaust parameter and gas extraction system
The dimensional structure parameter of part calculates the surface temperature distribution information of heat source component, and finally, the second computing module is according to hot evil portion
The surface temperature distribution information of the position of part and material parameter and heat source component corresponding with heat evil part calculates heat evil part
Heating temperature, with to heat evil part carry out heat evil assessment.The device can not only realize the reliable assessment to heat evil part, and
And simplify in vehicle heat management complicated three-dimensional CAE simulation analysis, it is to avoid the lance that cannot test measurement without the sample car stage
Shield, and avoid high experimental expenses.
According to one embodiment of present invention, the exhaust parameter include the exhaust system entrance at delivery temperature,
Extraction flow, pressure at expulsion and exhaust gas composition and delivery temperature, extraction flow, the pressure at expulsion in the gas extraction system exit
And exhaust gas composition.
According to one embodiment of present invention, the heat source component includes blast pipe, silencer, catalyst converter, heat shield, wind
One or more in fan, the dimensional structure parameter of the heat source component includes appearance and size, inner structure size, pipe thickness
And material property, the heat evil part is including hanger, wire harness, ABS, oil pipe, fire wall, sheath, power transmission shaft oil sealing, steering
One or more in machine, bracing wire, oil sump, the material parameter of the heat evil part includes size and material property.
According to one embodiment of present invention, first computing module calculates described by thermal convection current and heat transfer formula
The surface temperature distribution information of heat source component, wherein, the thermal convection current and heat transfer formula are respectively：
Wherein, q is the quantity of heat convection of exhaust and the heat source component, and h is the coefficient of heat transfer of the heat source component, tfFor
Delivery temperature, twThe surface temperature of the heat source component, φ is the heat conduction rate of the heat source component, λ1For the heat source component
Thermal conductivity factor, A1For the heat-conducting area of the heat source component,For thermograde.
According to one embodiment of present invention, second computing module is put by radiating received heat formula and forced convertion
Hot formula calculates the heating temperature of the heat evil part, wherein, the radiation received heat formula and the forced convertion heat release are public
Formula is respectively：
Wherein, Q1To radiate received heat, A2For the surface area of the heat evil, d1For the length of the heat source component, d2It is described
The length of heat evil part, σ radiation constants, T1The surface temperature of the heat source component, T2For it is described heat evil part heating temperature,
F12Ascent, ε1For the emissivity of the heat source component, ε2The emissivity of the heat evil part, Q2For forced convertion thermal discharge, λ
For air conduction coefficient, U∞For the convection velocity of surrounding air, T∞For ambient temperature, υ air viscosity coefficients.
Description of the drawings
Fig. 1 is the flow chart of the heat evil appraisal procedure of engine exhaust system according to embodiments of the present invention；
Fig. 2 is the test platform of the heat evil assessment of engine exhaust system according to an embodiment of the invention；
Fig. 3 is the runnable interface of heat evil part heating temperature calculation procedure according to an embodiment of the invention；
Fig. 4 is the schematic diagram of heat source component according to an embodiment of the invention and heat evil part；
Fig. 5 is the schematic diagram for installing thermal insulation board between silencer according to an embodiment of the invention and hanger additional；
Fig. 6 is the runnable interface of the calculation procedure for installing additional and being verified after thermal insulation board according to an embodiment of the invention；
And
Fig. 7 is the block diagram of the heat evil apparatus for evaluating of engine exhaust system according to embodiments of the present invention.
Reference：The pressure sensing of the temperature sensor 3, porch of the flowmeter 2, porch of engine 1, porch
The flowmeter 7 of the pressure sensor 6, exit of the temperature sensor 5, exit of device 4, exit, catalysis grid 8, exit
Flue gas analyzer 9, porch flue gas analyzer 10, exhaust measurement case 11, communicating pipe 12, data computer 13, hanger 14,
Muffler 15, surrounding flow 16, thermal insulation board 17.
Specific embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from start to finish
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and be not considered as limiting the invention.
With reference to the accompanying drawings the heat to describe the engine exhaust system of proposition according to embodiments of the present invention does harm to appraisal procedure
And device.
Fig. 1 is the flow chart of the heat evil appraisal procedure of engine exhaust system according to embodiments of the present invention.Such as Fig. 1 institutes
Show, the heat evil appraisal procedure of the engine exhaust system is comprised the following steps：
S1, obtains the exhaust parameter of engine under setting speed operating mode.
In an embodiment of the present invention, exhaust parameter may include delivery temperature, extraction flow, the row at exhaust system entrance
The delivery temperature in atmospheric pressure and exhaust gas composition and gas extraction system exit, extraction flow, pressure at expulsion and exhaust gas composition.
Specifically, flue gas can be gathered by flowmeter, temperature sensor, pressure sensor and flue gas analyzer to be urged
Temperature, flow, pressure and smoke components before and after change.Wherein, flowmeter can adopt the higher whirlpool of reliability and accuracy
Stream flowmeter, pressure sensor can adopt the higher piezoelectric transducer of accuracy, and flue gas analyzer is by analysis flue gas
The content of tri- kinds of harmful substances of CO, HC and NOx come assess smoke catalytic reaction before and after thermal change.
It should be noted that smoke catalytic reaction can be completed by being catalyzed grid, can be by flue gas by being catalyzed grid
Tri- kinds of harmful substances of CO, HC and NOx be converted into innocuous substance, its structure is the cellular lattice of metal glass to be had, rhodium, palladium coating
Grid carrier.
In actual applications, as shown in Fig. 2 can be by flowmeter, temperature sensor, pressure sensor, flue gas analyzer
And catalysis grid is arranged in an exhaust measurement case, and vacuum heat-insulating layer and heat-insulated asbestos are set in exhaust measurement chamber interior wall
Layer, to avoid gas energy from losing, while the data telecommunication line mouth of each sensor is left on exhaust measurement case, so as to data
Data computer can be transmitted directly to by order wire.In test, engine and exhaust are measured by case phase by communicating pipe
Even, then, the speed conditions of engine are set according to vehicle running state, and each sensor in exhaust measurement case will be obtained should
Flow, temperature, pressure and smoke components under operating mode, and data computer is transferred data to by order wire.
S2, according to the dimensional structure parameter of heat source component in exhaust parameter and gas extraction system the surface temperature of heat source component is calculated
Degree distributed intelligence.
According to one embodiment of present invention, heat source component may include blast pipe, silencer, catalyst converter, heat shield, fan
In one or more, because the part in each gas extraction system is different, therefore be not limited here.The chi of heat source component
Very little structural parameters may include appearance and size, inner structure size, pipe thickness and material property (such as surface roughness, transmitting
Rate, thermal conductivity etc.).
Specifically, the transitive relation of gas, and corresponding heat formula can be again arrived according to gas heat to solid：Q
=C*m* Δs t assessing flue gas into after engine exhaust system, the energy loss of each heat source component, and calculate each
The surface temperature of heat source component, wherein, Q is heat release heat, and C is specific heat capacity, and m is quality, and Δ t is temperature variation.
Further, according to one embodiment of present invention, heat source component can be calculated by thermal convection current and heat transfer formula
Surface temperature distribution information, wherein, thermal convection current and heat transfer formula are respectively：
Wherein, q is exhaust and the quantity of heat convection of heat source component, h for heat source component the coefficient of heat transfer, tfFor exhaust temperature
Degree, twThe surface temperature of heat source component, φ for heat source component heat conduction rate, λ1For the thermal conductivity factor of heat source component, A1For thermal source
The heat-conducting area of part,For thermograde.
Specifically, by taking blast pipe as an example.Blast pipe can be divided into the less multiple trifles of length, in each trifle
The surface temperature for thinking blast pipe is identical, calculates flue gas according to above-mentioned formula (1) and is delivered to the trifle exhaust pipe surface
Temperature, then the surface temperature of next trifle blast pipe is calculated.Because the heat of flue gas can be because of upper trifle blast pipe
A part of heat is lost, therefore the table of next trifle blast pipe can be calculated according to the surface temperature of upper trifle blast pipe
Face temperature.Calculate successively, until completing the calculating to whole blast pipe surface temperature.
In order to simplify the test assignment of tester, the calculating of window type can be compiled into previously according to above-mentioned formula (1)
Program, tester need to only be input into the dimensional structure parameter of heat source component and the exhaust parameter of engine, you can quick and convenient
The calculating completed to heat source component surface temperature.It is understood that can also be directly direct by the exhaust parameter of engine
Calculation procedure is imported, and without the need for tester's input.
S3, the position and the surface temperature of material parameter and heat source component corresponding with heat evil part according to heat evil part
Distributed intelligence calculates the heating temperature of heat evil part, to carry out heat evil assessment to heat evil part.
According to one embodiment of present invention, heat evil part may include hanger, wire harness, ABS, oil pipe, fire wall, sheath,
Power transmission shaft oil sealing, one or more turned in machine, bracing wire, oil sump, are not specifically limited here, the material ginseng of heat evil part
Number may include size (spacing, heating surface area such as with heat source component) and material property (such as absorptivity, thermal conductivity).
According to one embodiment of present invention, heat evil can be calculated by radiation received heat formula and forced convertion heat release formula
The heating temperature of part, wherein, radiation received heat formula and forced convertion heat release formula are respectively：
Wherein, Q1To radiate received heat, A2For the surface area of the heat evil, d1For the length of the heat source component, d2It is described
The length of heat evil part, σ radiation constants, T1The surface temperature of the heat source component, T2For it is described heat evil part heating temperature,
F12Ascent, ε1For the emissivity of the heat source component, ε2The emissivity of the heat evil part, Q2For forced convertion thermal discharge, λ
For air conduction coefficient, U∞For the convection velocity of surrounding air, T∞For ambient temperature, υ air viscosity coefficients.
It is equally possible that being compiled into the calculation procedure of window type previously according to above-mentioned formula (2), tester only needs defeated
Enter the surface temperature of heat source component and position and the material parameter of heat evil part, you can quick and be conveniently accomplished to hot evil portion
The calculating of part heating temperature.
During actual test, the defect larger in order to optimize complete Theory formula error calculated can be with reference to related real
Test data to be calculated, it is concrete as shown in Figure 3.Wherein, the corresponding parameter of operating mode one is the database that experiment is arranged, and is summarized with this
Associated hot evil part experimental data as reference data；The corresponding parameter of operating mode two be by said method obtain it is defeated
Enter parameter, temperature Tx for finally calculating is the surface temperature of heat evil part.F is shape factor ratio in formula, and e is formula medium velocity
Compare coefficient.
Entirely test to further illustrate by taking heat source component silencer and heat evil part hanger (as shown in Figure 4) as an example below
Process.
First, the exhaust outlet of engine (2.0L natural aspirations) is connected by communicating pipe with exhaust measurement case, builds survey
Test stand frame.Then, it is the operating mode of 3500rpm to engine sets target rotating speed, flue gas is measured by exhaust measurement case and is catalyzed
Front flow, temperature, pressure and composition, respectively 0.5L/s, 900 DEG C, 9.6bar, and measure flue gas and be catalyzed after grid catalysis
Flow, temperature, pressure and composition, respectively 0.4L/s, 950 DEG C, 8bar.Then, data computer is according to cigarette before and after catalysis
The content and above parameter evaluation of tri- kinds of harmful substances of CO, HC, NOx goes out the enthalpy of the flue gas of engine discharge in gas, is sent out
It is 30kw that motivation is vented possessed heat.
It should be noted that can be according to gas enthalpy computing formula, the enthalpy with blast pipe ambient air is as base
Standard, calculates the enthalpy of flue gas in the unit interval：
H=) C1+C2d/1000)t+Q*d/1000 (3)
Wherein, h be the unit time in flue gas enthalpy, C1For ambient air average specific heat at constant pressure appearance, C2For vapor
Specific heat at constant pressure, d is smoke moisture, and t is flue-gas temperature, and Q is the gasification latent heat of water under ambient temperature.
When by the logical air inlet system and exhaust system of flue gas under this heat (30kw), according to heat from gas to pipeline solid again to
The transmittance process of extraneous air, with reference to heat transfer mode in thermal conduction study, by each heat source component in above parameter and gas extraction system
Dimensional structure parameter be input into from the energy flow analysis program of edlin, calculate the flue gas of engine through exhaust system
The flowing change of energy during system, so as to the surface temperature for calculating heat source component muffler is 300 DEG C.
It is by the position of hanger, size and material property and right after the surface temperature for calculating heat source component muffler
The temperature of the heat source component answered imports temperature solver software, so as to the surface temperature for calculating hanger is 126 DEG C.
The heat evil appraisal procedure of engine exhaust system according to embodiments of the present invention, first with the exhaust measurement of design
Case completes the collection to engine exhaust parameter (temperature, flow, pressure, composition), and above parameter is input into into the energy from edlin
Amount flow analysis program, the flowing for calculating engine exhaust in the energy during gas extraction system changes, and completes to row
The assessment of the surface temperature distribution of each heat source component (such as blast pipe, muffler, catalyst converter) in gas system, then according to certainly
The heat evil problem that the heat evil temperature solver of edlin exists to gas extraction system peripheral parts under whole vehicle state is quickly had
The calculating of effect, completes the heat evil problem assessment under whole vehicle state.This process simplify three-dimensional CAE complicated in vehicle heat management to imitate
True analysis, relative to CAE simulation analysis more accurately, it is simple and convenient, and calculating cycle is short, fast operation, effectively keeps away
The contradiction that cannot test measurement without the sample car stage, and high experimental expenses are exempted from, have been the service life and car of vehicle
Design provide reference.
Further, after the heat evil problem assessment in the case where whole vehicle state is completed, Optimized Measures can be proposed to assessment result
And verified, for example, thus it is possible to vary the convection velocity (blowing amount) of the harmful parts surface air of heat, change heat evil distance, replacement
Into heat proof material or thermal insulation board is installed additional shielding heat source component etc..In addition in project development, change part knot can be also run into
Structure, position, install heat-insulated etc. additional, now can also be verified.
Specifically, still by taking heat source component silencer and heat evil part hanger as an example further illustrating.
As shown in figure 5, thermal insulation board can be added between silencer and hanger to shield impact of the silencer to hanger；Also may be used
To install aluminium foil heat shield additional on hanger；Spacing between silencer and hanger can also be adjusted to 120mm from 70mm；Also may be used
5m/s is adjusted to so that periotic speed air flow adjustment will be hung from 3m/s.It is then possible to soft by the checking from edlin
Part being verified, as shown in Figure 6.Empirical tests, after installing aluminium foil heat shield additional, the surface temperature of hanger is 85 DEG C；Spacing from
70mm is adjusted to after 120mm, and the surface temperature of hanger is 105 DEG C；Speed air flow adjustment is adjusted to after 5m/s from 3m/s, is hung
The surface temperature of ear is 99 DEG C.So as to may determine that whether the Optimized Measures have reached desired result according to the result.
In one embodiment of the invention, the heating temperature such as institute of table 1 of the surface temperature of heat source component and heat evil part
Show.
Table 1
In sum, the heat evil appraisal procedure of engine exhaust system according to embodiments of the present invention, first, obtains setting
The exhaust parameter of engine under speed conditions, then, according to the dimensional structure ginseng of heat source component in exhaust parameter and gas extraction system
Number calculate heat source component surface temperature distribution information, finally, according to heat evil part position and material parameter and with heat evil
The surface temperature distribution information of the corresponding heat source component of part calculates the heating temperature of heat evil part, to carry out heat to heat evil part
Evil assessment.The method can not only realize the reliable assessment to heat evil part, and simplify in vehicle heat management complicated three
Vc AE simulation analysis, it is to avoid without the sample car stage cannot test the contradiction of measurement, and avoid high experimental expenses.
Fig. 7 is the block diagram of the heat evil apparatus for evaluating of engine exhaust system according to embodiments of the present invention.Such as Fig. 7 institutes
Show, the heat evil apparatus for evaluating of the engine exhaust system includes：Acquisition module 10, the first computing module 20 and the second computing module
30。
Wherein, acquisition module 10 is used to obtain the exhaust parameter of engine under setting speed operating mode.
According to one embodiment of present invention, exhaust parameter include exhaust system entrance at delivery temperature, extraction flow,
The delivery temperature in pressure at expulsion and exhaust gas composition and gas extraction system exit, extraction flow, pressure at expulsion and exhaust gas composition.
First computing module 20 is used to be calculated according to the dimensional structure parameter of heat source component in exhaust parameter and gas extraction system
The surface temperature distribution information of heat source component.
According to one embodiment of present invention, heat source component may include blast pipe, silencer, catalyst converter, heat shield, fan
In one or more, the dimensional structure parameter of heat source component may include appearance and size, inner structure size, pipe thickness and
Material property.
According to one embodiment of present invention, the first computing module 20 can calculate thermal source by thermal convection current and heat transfer formula
The surface temperature distribution information of part, wherein, shown in thermal convection current and for example above-mentioned formula (1) of heat transfer formula.
Second computing module 30 is used for the position according to heat evil part and material parameter and heat corresponding with heat evil part
The surface temperature distribution information of source block calculates the heating temperature of heat evil part, to carry out heat evil assessment to heat evil part.
According to one embodiment of present invention, heat evil part may include hanger, wire harness, ABS, oil pipe, fire wall, sheath,
Power transmission shaft oil sealing, turn to machine, bracing wire, one or more in oil sump, the material parameter of heat evil part may include size and
Material property.
According to one embodiment of present invention, the second computing module 30 can be put by radiating received heat formula and forced convertion
Hot formula calculates the heating temperature of the heat evil part, wherein, radiation received heat formula and forced convertion heat release formula are as described above
Shown in formula (2).
It should be noted that what is do not disclosed in the heat evil apparatus for evaluating of the engine exhaust system of the embodiment of the present invention is thin
Section, the details disclosed in the heat evil appraisal procedure of the engine exhaust system that refer to the embodiment of the present invention, specifically here not
Repeat again.
The heat evil apparatus for evaluating of engine exhaust system according to embodiments of the present invention, first, is obtained by acquisition module
The exhaust parameter of engine under setting speed operating mode, then, the first computing module is according to thermal source in exhaust parameter and gas extraction system
The dimensional structure parameter of part calculates the surface temperature distribution information of heat source component, and finally, the second computing module is according to hot evil portion
The surface temperature distribution information of the position of part and material parameter and heat source component corresponding with heat evil part calculates heat evil part
Heating temperature, with to heat evil part carry out heat evil assessment.The device can not only realize the reliable assessment to heat evil part, and
And simplify in vehicle heat management complicated three-dimensional CAE simulation analysis, it is to avoid the lance that cannot test measurement without the sample car stage
Shield, and avoid high experimental expenses.
In describing the invention, it is to be understood that term " " center ", " longitudinal direction ", " horizontal ", " length ", " width ",
" thickness ", " on ", D score, "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outward ", " up time
The orientation or position relationship of the instruction such as pin ", " counterclockwise ", " axial direction ", " radial direction ", " circumference " be based on orientation shown in the drawings or
Position relationship, is for only for ease of the description present invention and simplifies description, rather than indicates or imply that the device or element of indication must
With specific orientation, with specific azimuth configuration and operation, therefore must be not considered as limiting the invention.
Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that indicating or implying relative importance
Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or
Implicitly include at least one this feature.In describing the invention, " multiple " are meant that at least two, such as two, three
It is individual etc., unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " fixation " etc.
Term should be interpreted broadly, for example, it may be fixedly connected, or be detachably connected, or it is integral；Can be that machinery connects
Connect, or electrically connect；Can be joined directly together, it is also possible to be indirectly connected to by intermediary, can be in two elements
The connection in portion or the interaction relationship of two elements, unless otherwise clearly restriction.For one of ordinary skill in the art
For, can as the case may be understand above-mentioned term concrete meaning in the present invention.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be with
It is the first and second feature directly contacts, or the first and second features are by intermediary mediate contact.And, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature are directly over second feature or oblique upper, or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is immediately below second feature or obliquely downward, or is merely representative of fisrt feature level height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means to combine specific features, structure, material or spy that the embodiment or example are described
Point is contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.And, the specific features of description, structure, material or feature can be with office
Combine in an appropriate manner in one or more embodiments or example.Additionally, in the case of not conflicting, the skill of this area
Art personnel can be tied the feature of the different embodiments or example described in this specification and different embodiments or example
Close and combine.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification.
Claims (10)
1. a kind of heat of engine exhaust system does harm to appraisal procedure, it is characterised in that comprise the following steps：
Obtain the exhaust parameter of engine under setting speed operating mode；
The heat source component is calculated according to the dimensional structure parameter of heat source component in the exhaust parameter and the gas extraction system
Surface temperature distribution information；And
Position and the surface temperature point of material parameter and heat source component corresponding with the heat evil part according to heat evil part
Cloth information calculates the heating temperature of the heat evil part, to carry out heat evil assessment to the heat evil part.
2. the method for claim 1, it is characterised in that the exhaust parameter includes the row at the exhaust system entrance
The delivery temperature in temperature degree, extraction flow, pressure at expulsion and exhaust gas composition and the gas extraction system exit, extraction flow,
Pressure at expulsion and exhaust gas composition.
3. the method for claim 1, it is characterised in that the heat source component include blast pipe, silencer, catalyst converter,
One or more in heat shield, fan, the dimensional structure parameter of the heat source component includes appearance and size, internal structure chi
Very little, pipe thickness and material property, the heat evil part includes hanger, wire harness, anti-blocking brake system ABS, oil pipe, fire prevention
Wall, sheath, power transmission shaft oil sealing, one or more turned in machine, bracing wire, oil sump, the material parameter bag of the heat evil part
Include size and material property.
4. the method as any one of claim 1-3, it is characterised in that institute is calculated by thermal convection current and heat transfer formula
The surface temperature distribution information of heat source component is stated, wherein, the thermal convection current and heat transfer formula are respectively：
Wherein, q is the quantity of heat convection of exhaust and the heat source component, and h is the coefficient of heat transfer of the heat source component, tfFor exhaust
Temperature, twThe surface temperature of the heat source component, φ is the heat conduction rate of the heat source component, λ1For leading for the heat source component
Hot coefficient, A1For the heat-conducting area of the heat source component,For thermograde.
5. the method as any one of claim 1-3, it is characterised in that by radiating received heat formula and forced convertion
Heat release formula calculates the heating temperature of the heat evil part, wherein, it is described to radiate received heat formula and the forced convertion heat release
Formula is respectively：
Wherein, Q1To radiate received heat, A2For the surface area of the heat evil, d1For the length of the heat source component, d2The heat evil
The length of part, σ radiation constants, T1The surface temperature of the heat source component, T2For the heating temperature of the heat evil part, F12Angle
Coefficient, ε1For the emissivity of the heat source component, ε2The emissivity of the heat evil part, Q2For forced convertion thermal discharge, λ is empty
Gas thermal conductivity factor, U∞For the convection velocity of surrounding air, T∞For ambient temperature, υ air viscosity coefficients.
6. a kind of heat of engine exhaust system does harm to apparatus for evaluating, it is characterised in that include：
Acquisition module, for obtaining setting speed operating mode under engine exhaust parameter；
First computing module, based on according to the dimensional structure parameter of heat source component in the exhaust parameter and the gas extraction system
Calculate the surface temperature distribution information of the heat source component；And
Second computing module, for according to the position of heat evil part and material parameter and thermal source corresponding with the heat evil part
The surface temperature distribution information of part calculates the heating temperature of the heat evil part, is commented with carrying out heat evil to the heat evil part
Estimate.
7. device as claimed in claim 6, it is characterised in that the exhaust parameter includes the row at the exhaust system entrance
The delivery temperature in temperature degree, extraction flow, pressure at expulsion and exhaust gas composition and the gas extraction system exit, extraction flow,
Pressure at expulsion and exhaust gas composition.
8. device as claimed in claim 6, it is characterised in that the heat source component include blast pipe, silencer, catalyst converter,
One or more in heat shield, fan, the dimensional structure parameter of the heat source component includes appearance and size, internal structure chi
Very little, pipe thickness and material property, the heat evil part includes hanger, wire harness, anti-blocking brake system ABS, oil pipe, fire prevention
Wall, sheath, power transmission shaft oil sealing, one or more turned in machine, bracing wire, oil sump, the material parameter bag of the heat evil part
Include size and material property.
9. the device as any one of claim 6-8, it is characterised in that first computing module by thermal convection current and
Heat transfer formula calculates the surface temperature distribution information of the heat source component, wherein, the thermal convection current and heat transfer formula are distinguished
For：
Wherein, q is the quantity of heat convection of exhaust and the heat source component, and h is the coefficient of heat transfer of the heat source component, tfFor exhaust
Temperature, twThe surface temperature of the heat source component, φ is the heat conduction rate of the heat source component, λ1For leading for the heat source component
Hot coefficient, A1For the heat-conducting area of the heat source component,For thermograde.
10. the device as any one of claim 6-8, it is characterised in that second computing module is received by radiation
Heat formula and forced convertion heat release formula calculate the heating temperature of the heat evil part, wherein, the radiation received heat formula
It is respectively with the forced convertion heat release formula：
Wherein, Q1To radiate received heat, A2For the surface area of the heat evil, d1For the length of the heat source component, d2The heat evil
The length of part, σ radiation constants, T1The surface temperature of the heat source component, T2For the heating temperature of the heat evil part, F12Angle
Coefficient, ε1For the emissivity of the heat source component, ε2The emissivity of the heat evil part, Q2For forced convertion thermal discharge, λ is empty
Gas thermal conductivity factor, U∞For the convection velocity of surrounding air, T∞For ambient temperature, υ air viscosity coefficients.
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| CN201610827461.5A CN106649923B (en) | 2016-09-14 | 2016-09-14 | Method and device for evaluating thermal damage of engine exhaust system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108052784A (en) * | 2018-01-31 | 2018-05-18 | 北京汽车股份有限公司 | Crew module's temperature simulation method and system |
| CN108491676A (en) * | 2018-06-29 | 2018-09-04 | 北京汽车股份有限公司 | The heat-proof quality simulating analysis and system of heat shield |
| CN109145388A (en) * | 2018-07-25 | 2019-01-04 | 中国航发沈阳发动机研究所 | The heat analysis method of aero-engine component |
| CN109902319A (en) * | 2017-12-07 | 2019-06-18 | 上汽通用汽车有限公司 | The analysis method of car engine air admittance temperature under the operating condition of city |
| CN111523176A (en) * | 2020-04-13 | 2020-08-11 | 东风汽车集团有限公司 | Construction method and system for thermal hazard test working condition of passenger car |
| CN113094768A (en) * | 2021-04-01 | 2021-07-09 | 中汽研（天津）汽车工程研究院有限公司 | Thermal management-thermal runaway joint simulation method for power battery system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102663179A (en) * | 2012-03-29 | 2012-09-12 | 奇瑞汽车股份有限公司 | Method for checking temperature fields of automobile front cabin in layout stage |
| CN103674310A (en) * | 2012-09-26 | 2014-03-26 | 中国人民解放军第二炮兵工程大学 | Oil temperature measurement method based on oil tube surface temperature measurement |
-
2016
- 2016-09-14 CN CN201610827461.5A patent/CN106649923B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102663179A (en) * | 2012-03-29 | 2012-09-12 | 奇瑞汽车股份有限公司 | Method for checking temperature fields of automobile front cabin in layout stage |
| CN103674310A (en) * | 2012-09-26 | 2014-03-26 | 中国人民解放军第二炮兵工程大学 | Oil temperature measurement method based on oil tube surface temperature measurement |
Non-Patent Citations (3)
| Title |
|---|
| M MICHON等: "Modelling and Testing of a Turbo-generator System for Exhaust Gas Energy recovery", 《2007IEEE》 * |
| 李盈盈 等: "基于FLUENT的汽车燃油箱热害分析及优化", 《汽车实用技术》 * |
| 谢暴 等: "基于CFD的汽车发动机舱热管理及优化", 《汽车安全与节能学报》 * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109902319A (en) * | 2017-12-07 | 2019-06-18 | 上汽通用汽车有限公司 | The analysis method of car engine air admittance temperature under the operating condition of city |
| CN109902319B (en) * | 2017-12-07 | 2023-01-10 | 上汽通用汽车有限公司 | Method for analyzing air inlet temperature of automobile engine under urban working condition |
| CN108052784A (en) * | 2018-01-31 | 2018-05-18 | 北京汽车股份有限公司 | Crew module's temperature simulation method and system |
| CN108491676A (en) * | 2018-06-29 | 2018-09-04 | 北京汽车股份有限公司 | The heat-proof quality simulating analysis and system of heat shield |
| CN108491676B (en) * | 2018-06-29 | 2021-10-22 | 北京汽车股份有限公司 | Heat insulation performance simulation analysis method and system of heat shield |
| CN109145388A (en) * | 2018-07-25 | 2019-01-04 | 中国航发沈阳发动机研究所 | The heat analysis method of aero-engine component |
| CN111523176A (en) * | 2020-04-13 | 2020-08-11 | 东风汽车集团有限公司 | Construction method and system for thermal hazard test working condition of passenger car |
| CN111523176B (en) * | 2020-04-13 | 2023-02-28 | 东风汽车集团有限公司 | Construction method and system for thermal hazard test working condition of passenger car |
| CN113094768A (en) * | 2021-04-01 | 2021-07-09 | 中汽研（天津）汽车工程研究院有限公司 | Thermal management-thermal runaway joint simulation method for power battery system |
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