CN105243191A - Method for analyzing tunnel car exhaust gas flow and concentration distribution law - Google Patents
Method for analyzing tunnel car exhaust gas flow and concentration distribution law Download PDFInfo
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- CN105243191A CN105243191A CN201510589044.7A CN201510589044A CN105243191A CN 105243191 A CN105243191 A CN 105243191A CN 201510589044 A CN201510589044 A CN 201510589044A CN 105243191 A CN105243191 A CN 105243191A
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Abstract
The present invention relates to a method for analyzing tunnel car exhaust flow and a concentration distribution law by using numerical simulation software, and belongs to the field of tunnel exhaust gas monitoring. The method aims to solve problems of high difficulty, high cost, long period, and poor accuracy for detecting tunnel car exhaust gas flow and concentration distribution. The method of the present invention comprises: establishing a tunnel car exhaust flow analysis model; after dynamic mesh meshing, making a basic assumption to determine a computational domain; defining a boundary condition and an initial condition; selecting a corresponding mathematical model; and using fluid dynamics software to analyze car exhaust flow in the entire tunnel and the ramp space center axial section, and each component concentration distribution law under different construction conditions, thereby providing a theoretical basis for the design of tunnel ventilation equipment; and investigating exhaust gas flow condition, components, the distribution law of concentration gradient over time near the tunnel road surface, and in a short time, obtaining a cloud stable of car exhaust turbulence intensity and exhaust concentration near the road surface, thereby providing a reference for a photocatalytic material applied to the tunnel pavement and ancillary facilities.
Description
Technical field
The present invention is a kind of method utilizing numerical simulation software to analyze vehicle exhaust flowing and CONCENTRATION DISTRIBUTION rule in tunnel, belongs to tunnel pollution monitoring technical field.
Background technology:
Vcehicular tunnel as surface road extension and supplement be widely used.But because vcehicular tunnel is structurally as the artificial space of a relative closure, in tunnel, the motor vehicle of operation will give off pollutant harmful in a large number, comprises carbon monoxide, hydrocarbon, oxides of nitrogen, soot particulate etc.; Meanwhile, motor vehicle also can cause a large amount of reentrainment of dusts in the process of moving, and all kinds of harmful gas and particle are confined to semi-enclosed finite space.When in tunnel, motor vehicle is more, the waste gas produced in driving process is easily accumulated in tunnel, pollutant levels increase sharply, when concentration is accumulated to a certain degree, the tail gas discharged will the whole tunnel of severe contamination, in harm tunnel, the health of driver and conductor, reduces the physiological reaction ability of driver and conductor, increases the risk that traffic hazard occurs.And photochemical reaction is passed through in gas pollutant and other Organic Pollution source, facility in direct pollution tunnel, because tunnel ventilation is poor, the tail gas accumulated gradually forms oil stain on road surface, make road surface become smooth, while affecting traffic safety, also have a strong impact on ecologic environment.
How carrying out Design of ventilation to reach effect that is efficient, energy-saving and environmental protection to tunnel is one of maximum difficult problem of facing of Tunnel Design person.Therefore be necessary to analyze and research to gaseous contaminant flowing law and CONCENTRATION DISTRIBUTION in tunnel in Design of Tunnel Ventilation System process, instruct engineering practice.And in tunnel traffic, vehicle exhaust, as the main body of gaseous contaminant in tunnel, seems particularly important to vehicle exhaust flowing and CONCENTRATION DISTRIBUTION rule in tunnel.In addition, along with popularizing of catalysis material, increasing researcher considers catalysis material to be applied in road engineering, and tunnel is as the throat thoroughfare of road grid traffic, by theoretical foundation can be provided for tunnel road surface and affiliated facility photocatalytic degradation material degradation effect test system to tunnel on-highway motor vehicle at the emissions status of shortcut surface layer vehicle exhaust and the research of Diffusion Law, also the development and the effective application that can be tunnel road motor vehicle emission pollutant photocatalytic degradation material provide reference, have important practical significance.
Both at home and abroad to vehicle exhaust flow distribution and pollution problem in tunnel, achieve the active research achievement that some are useful.At present, in tunnel vehicle exhaust flowing and CONCENTRATION DISTRIBUTION mainly through carrying out experimental simulation to the tail gas of tunnel motor vehicle emission and fluid dynamic numerical simulation two kinds of methods are researched and analysed.Owing to not forming the theoretical analysis of system to tunnel exhaust gas flow and CONCENTRATION DISTRIBUTION rule, the method for employing is mainly by means of technique of experimental simulation.But because the diffusion motion of vehicle exhaust in tunnel is very complicated, it not only depends on the physical property of pollutant and air, and closely related with air flow condition, running velocity, vehicle fleet size etc. in tunnel.In experimental simulation process, tunnel tail gas Concentration Testing, testing expenses are high, and the test period is long, means of testing is subject to the impact of surrounding environment, be difficult to obtain the reasons such as good simulated condition, Test And Research Work is restricted, gained test figure does not have universality.Therefore, scaled down model test does qualitative analysis only, is difficult to do quantitative examination.
Along with the fast development of computer technology and computational mathematics, increasing people starts the numerical simulation study being devoted to exhaust gas flow in automobile in tunnel, and the method has the features such as repeatability is good, expense is low, the cycle is short, information completely.Consider the difficulty of on-highway motor vehicle tail gas flow field dynamic experiment simulation, the present invention's application technology of numerical simulation is studied.Utilize fluid dynamics numerical analysis software, based on finite volume method, vehicle exhaust flowing and CONCENTRATION DISTRIBUTION rule in tunnel are studied, for the ventilation equipment design in Tunnel Engineering, tail gas measuring technology, photocatalytic degradation road surface and affiliated facility photocatalytic degradation material degradation effect test system provide theoretical foundation, the development and the effective application that also can be tunnel road surface motor vehicle emission pollutant photocatalytic degradation material provide reference.
Due to the difficulty of tunnel machine motor-car tail gas flow field experimental simulation and detection of dynamic, the present invention is as a kind of method utilizing numerical simulation software to analyze vehicle exhaust flowing and CONCENTRATION DISTRIBUTION rule in tunnel, according to tunnel Contaminants Transport, diffusion theory, set up the air pollutants mathematical model more tallied with the actual situation, draw gas pollutant motion diffusion, the regularity of distribution.To design for ventilating apparatus for tunnels and photocatalytic environmental-protection road surfacing preliminary preparation in tunnel provides theoretical foundation, purifying vehicle exhaust technology in research tunnel is had important practical significance.
Summary of the invention
(1) technical matters
The present invention is a kind of method utilizing numerical simulation software to analyze vehicle exhaust flowing and CONCENTRATION DISTRIBUTION rule in tunnel, solve vehicle exhaust flowing and CONCENTRATION DISTRIBUTION detection difficulty in current tunnel greatly, costly, the problem of the design of cycle length, poor accuracy, ventilating apparatus for tunnels and photocatalytic environmental-protection material application shortage scientific basis.
(2) technical scheme
In tunnel, vehicle exhaust flowing affects by factors such as the volume of traffic, traffic composition, travel speed, ventilation speed, and exhaust gas flow and CONCENTRATION DISTRIBUTION are very complicated.The present invention first adopts fluid dynamics software to set up vehicle exhaust flow analysis model in tunnel, after Dynamic mesh grid division, make basic assumption determination computational fields, definition boundary condition, starting condition, selected corresponding mathematical model, utilize fluid dynamics software analysis jet blower and wind tower exhaust blower respectively under opening and closing state, under different wind speed, vehicle flowrate, flow speeds, main tunnel and ring road central shaft flow and the CONCENTRATION DISTRIBUTION rule of each composition, in tunnel, the design of ventilation equipment provides theoretical foundation to section vehicle exhaust; Finally, investigate tunnel road surface near surface vehicle exhaust flow condition, exhaust gas component, the time dependent regularity of distribution of concentration gradient, obtaining vehicle exhaust in the short time at the turbulence intensity of shortcut surface layer and tail gas contour band, providing reference for applying catalysis material on tunnel road surface and affiliated facility.
(3) beneficial effect
Vcehicular tunnel is structurally the artificial space of a relative closure, and the waste gas that vehicle produces in the process of moving is easily accumulated in tunnel, and reaches higher concentration, thus endangers the health of driver and conductor in tunnel, pollutes tunnel ecologic environment.Consider that the discharge of vehicle exhaust shows the complicacy flowed in atmosphere by various such environmental effects.The method utilizing vehicle exhaust flowing and CONCENTRATION DISTRIBUTION rule in numerical analysis software sunykatuib analysis tunnel provided by the invention, there is the features such as repeatability is good, expense is low, the cycle is short, information completely, for the construction of ventilating apparatus for tunnels provides design considerations, also for the development of tunnel road motor vehicle emission pollutant photocatalytic degradation material provides reference with effectively applying.The present invention to the health hazard of driver and conductor, improves physiological reaction ability to automobile exhaust pollution in reduction tunnel, reduces tunnel traffic accident, and the ecologic environment in protection tunnel is of great practical significance.
Embodiment
The present invention is a kind of method utilizing numerical simulation software to analyze vehicle exhaust flowing and CONCENTRATION DISTRIBUTION rule in tunnel, and concrete implementation step is as follows:
(1) fluid dynamic numerical simulation software is utilized to set up vehicle exhaust flow analysis physical model in tunnel, select regular hexahedron dividing elements grid, and encrypt grid around vehicle body, to adopt Dynamic mesh simulating vehicle profile motion state in tunnel flow field;
(2) in order to the needs of analog computation, suppose tunnel wall be wall without slip boundary, do not consider that wall surface temperature and Lu Biao temperature are on the impact of air-flow, the constant and constant motion of motor vehicle of the speed of a motor vehicle is controlled by self-defining function;
(3) rational starting condition and boundary condition is determined, the section choosing tunnel port is set to air velocity import, choose motor vehicle tail section and be set to the import of tail gas speed, another section of tunnel port is set to free export, under different operating mode, run this software respectively, preserve operation result respectively;
(4) analyzing jet blower and the wind tower exhaust blower tail gas CONCENTRATION DISTRIBUTION of vehicle exhaust in tunnel on different section under different wind speed, vehicle flowrate, running speed condition when opening and closing respectively based on operation result, obtaining the axial section vehicle exhaust in tunnel and the whole space center of ring road thereof and flowing and the concentration gradient cloud charts of various composition;
(5) analyze the flowing of tunnel link table vicinity vehicle exhaust, exhaust gas component and concentration gradient thereof to distribute time dependent rule, obtain turbulence intensity at shortcut table place of vehicle exhaust in short time inner tunnel and each component concentration gradient cloud charts of tail gas, spread condition, specify vehicle exhaust flowing and CONCENTRATION DISTRIBUTION rule in tunnel.
Claims (1)
1. the present invention is a kind of method utilizing numerical simulation software to analyze vehicle exhaust flowing and CONCENTRATION DISTRIBUTION rule in tunnel, it is characterized in that the concrete steps of the method are as follows:
(1) fluid dynamic numerical simulation software is utilized to set up vehicle exhaust flow analysis physical model in tunnel, select regular hexahedron dividing elements grid, and encrypt grid around vehicle body, to adopt Dynamic mesh simulating vehicle profile motion state in tunnel flow field;
(2) in order to the needs of analog computation, suppose tunnel wall be wall without slip boundary, do not consider that wall surface temperature and Lu Biao temperature are on the impact of air-flow, the constant and constant motion of motor vehicle of the speed of a motor vehicle is controlled by self-defining function;
(3) rational starting condition and boundary condition is determined, the section choosing tunnel port is set to air velocity import, choose motor vehicle tail section and be set to the import of tail gas speed, another section of tunnel port is set to free export, under different operating mode, run this software respectively, preserve operation result respectively;
(4) analyzing jet blower and the wind tower exhaust blower tail gas CONCENTRATION DISTRIBUTION of vehicle exhaust in tunnel on different section under different wind speed, vehicle flowrate, running speed condition when opening and closing respectively based on operation result, obtaining the axial section vehicle exhaust in tunnel and the whole space center of ring road thereof and flowing and the concentration gradient cloud charts of various composition;
(5) analyze the flowing of tunnel link table vicinity vehicle exhaust, exhaust gas component and concentration gradient thereof to distribute time dependent rule, obtain turbulence intensity at shortcut table place of vehicle exhaust in short time inner tunnel and each component concentration gradient cloud charts of tail gas, spread condition, specify vehicle exhaust flowing and CONCENTRATION DISTRIBUTION rule in tunnel.
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| CN201510589044.7A CN105243191A (en) | 2015-09-14 | 2015-09-14 | Method for analyzing tunnel car exhaust gas flow and concentration distribution law |
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| CN201510589044.7A CN105243191A (en) | 2015-09-14 | 2015-09-14 | Method for analyzing tunnel car exhaust gas flow and concentration distribution law |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108229013A (en) * | 2017-12-29 | 2018-06-29 | 四川大学 | A kind of full ventilation by force draft required airflow computational methods in Ramp urban road tunnel |
| CN109002573A (en) * | 2018-06-01 | 2018-12-14 | 湖南科技大学 | A kind of Extra-long Highway Tunnel circulating ventilation system applicability determination method |
| CN115659805A (en) * | 2022-10-27 | 2023-01-31 | 吉林农业科技学院 | Big data-based air pollution mathematical model establishing method |
-
2015
- 2015-09-14 CN CN201510589044.7A patent/CN105243191A/en active Pending
Non-Patent Citations (4)
| Title |
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| 施孝增等: "新建路隧道气态污染物浓度分布的数值模拟研究", 《洁净与空调技术》 * |
| 杨玉容: "公路隧道洞口废弃扩散形态与窜流影响研究", 《中国博士学位论文全文数据库 工程科技Ⅱ辑（月刊）》 * |
| 潘胜: "城市公路隧道汽车尾气排放浓度的研究及通风方案的设计", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑（月刊）》 * |
| 邓顺熙等: "特长公路隧道洞口污染物扩散的有限元法模拟", 《中国公路学报》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108229013A (en) * | 2017-12-29 | 2018-06-29 | 四川大学 | A kind of full ventilation by force draft required airflow computational methods in Ramp urban road tunnel |
| CN108229013B (en) * | 2017-12-29 | 2018-10-12 | 四川大学 | A kind of full ventilation by force draft required airflow computational methods in Ramp urban road tunnel |
| CN109002573A (en) * | 2018-06-01 | 2018-12-14 | 湖南科技大学 | A kind of Extra-long Highway Tunnel circulating ventilation system applicability determination method |
| CN109002573B (en) * | 2018-06-01 | 2023-01-10 | 湖南科技大学 | Method for judging applicability of circulating ventilation system of extra-long highway tunnel |
| CN115659805A (en) * | 2022-10-27 | 2023-01-31 | 吉林农业科技学院 | Big data-based air pollution mathematical model establishing method |
| CN115659805B (en) * | 2022-10-27 | 2024-01-23 | 吉林农业科技学院 | Method for establishing mathematical model of air pollution based on big data |
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