CN109033675B - Critical wind division ratio judgment method of circulating ventilation system of extra-long highway tunnel - Google Patents
Critical wind division ratio judgment method of circulating ventilation system of extra-long highway tunnel Download PDFInfo
- Publication number
- CN109033675B CN109033675B CN201810903631.2A CN201810903631A CN109033675B CN 109033675 B CN109033675 B CN 109033675B CN 201810903631 A CN201810903631 A CN 201810903631A CN 109033675 B CN109033675 B CN 109033675B
- Authority
- CN
- China
- Prior art keywords
- tunnel
- formula
- flow
- smoke
- air
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Computer Hardware Design (AREA)
- Evolutionary Computation (AREA)
- Geometry (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Ventilation (AREA)
Abstract
The invention discloses a critical wind distribution ratio judgment method of a circulating ventilation system of an extra-long highway tunnel, which comprises the following steps of: 1) Calculating the smoke concentration of the parallel wind flow of the circulating wind flow: a) calculating the smoke flow from the upstream wind flow, b) calculating the smoke flow of the newly added parallel wind flow, and c) calculating the smoke concentration of the parallel wind flow; 2) Calculating a critical air distribution ratio; the formula of the critical air division ratio shows that: when the air distribution ratio is equal to or greater than the critical air distribution ratio, the concentration of the smoke dust of the parallel air flow in the short tunnel exceeds the allowable concentration, and vehicles running in the short tunnel are unsafe. The method can avoid the complicated calculation of dimensional numerical parameters such as tunnel length, section size and the like, or the network calculation of a ventilation system, or the complicated and time-consuming computational fluid dynamics numerical simulation, and quickly determine the ratio of the upstream air flow, the circulating air flow and the parallel air flow; the safety of the vehicles running in the tunnel is ensured.
Description
Technical Field
The invention belongs to the technical field of tunnel disaster prevention and reduction, and particularly relates to a critical wind division ratio judgment method of a circulating ventilation system of an extra-long highway tunnel.
Background
The highway tunnel is a half-sunk or shallow-buried narrow and long space, and is an important problem which is always concerned by the industry in treating pollutants such as smoke dust and the like generated by vehicles running in the tunnel. The method generally adopts a mechanical ventilation method to dilute pollutants such as smoke dust, CO and the like, discharges dirty air to the environment outside the tunnel, and belongs to a straight-flow system scheme. The ventilation system of the long-distance or extra-long-distance highway tunnel must be matched with a ventilation vertical shaft to meet the wind demand of diluting pollutants in the tunnel. The ventilation of the extra-long road tunnel particularly relates to optimization of influence factors such as a vertical shaft excavation position, a ventilator, a jet fan group and an air duct, and is a leading-edge problem in the industry.
At present, external fresh air is introduced into the tunnel to dilute pollutants discharged by vehicles, and then the polluted air is discharged out of the tunnel, which is the traditional tunnel ventilation with high energy consumption. Adopting shaft sectional air supply, introducing external fresh air, diluting pollutants in the extra-long tunnel, ensuring the concentration of the pollutants to be within a safe value, and finally discharging dirty air through the sectional shaft; the common ventilation system of the shaft sectional air supply and exhaust tunnel is practiced by Kwa G S, xia Yong Xue and the like. For the method of application model tests such as traffic wind, azimuth, wang and the like formed by driving in the tunnel, the condition that the air supply opening and the driving direction of the tunnel should be 6 degrees, and the included angle between the air exhaust opening and the driving direction of the tunnel should not be more than 30 degrees is obtained; then, the supernumerary and the like clearly indicate that the ventilation shaft air supply and exhaust type longitudinal ventilation system always has the problems of large civil engineering cost and large operation energy consumption. Aiming at an extra-long tunnel with high engineering cost of a ventilation shaft or without a set condition, double-hole complementary ventilation is firstly proposed by Berner and the like by utilizing the characteristic of uneven ventilation load of an uplink and a downlink; by using model experiments and numerical simulation, zhangguanpeng verifies and checks design parameters, and double-hole complementary ventilation is applied to the brocade tunnel; through experimental actual measurement, the flow field in the tunnel under the double-hole complementary ventilation is deeply researched by the moleon and the like, the feasibility of the ventilation mode is further demonstrated, and the double-hole complementary ventilation mode is generally suitable for the highway tunnel between 4km and 7 km. However, the problems that the ventilation cost of the extra-long tunnel is high, the shaft excavation position is restricted by geology and city planning and the like still stand out, and a critical wind division ratio judgment method for the controllable circulating ventilation system of the extra-long road tunnel is not formed.
Disclosure of Invention
In order to solve the problems, the invention provides a critical wind division ratio judgment method of an extra-long road tunnel circulating ventilation system, which can quickly and quickly complete the pre-evaluation of the extra-long road tunnel circulating ventilation system.
The technical scheme adopted by the invention is as follows: a critical wind division ratio judgment method of an extra-long road tunnel circulating ventilation system comprises a circulating air duct and an adjustable auxiliary structure; the adjustable auxiliary structure comprises an air exhaust vertical shaft and an air supply vertical shaft which are communicated with the circulating air duct; the circulating air duct is arranged in a bypass tunnel of the tunnel, and two ends of the circulating air duct are respectively communicated with the tunnel through the air inducing section and the injection section; a dust remover is arranged in the circulating air duct; the part between the tunnel inlet and the induced air section is an upstream tunnel, the part between the induced air section and the injection section is a short tunnel path, and the part between the injection section and the tunnel outlet is a downstream tunnel;
the method comprises the following steps:
1) Calculating the smoke concentration of the parallel wind flow of the circulating wind flow:
a) Calculating the smoke flow from the upstream wind flow according to the formula (1):
Q s1(VI) ＝δ 1 (1-e)Q r (1)
in the formula: q s1(VI) Is the flow of smoke from the upstream air stream, m 2 S; e is the wind ratio, and is a dimensionless number; delta 1 Smoke concentration, m, of the upstream air stream -1 ；Q r For the external fresh air quantity introduced from the tunnel entrance, m 3 /s；
b) Calculating the smoke dust flow of the newly added parallel wind flow, wherein the calculation formula is as the formula (2):
Q s2(VI) ＝C·L s (2)
in the formula: q s2(VI) For newly increased smoke flow in parallel wind flow, m 2 /s；L s The length of the short tunnel of the circulating air duct is m; c is a comprehensive influence factor of the smoke flow, m/s;
c) Calculating the smoke concentration of the parallel wind flow, wherein the calculation formula is as formula (3):
in the formula: delta 2 The smoke concentration, m, of the parallel wind flow -1 (ii) a e is the wind ratio, and is a dimensionless number; delta. For the preparation of a coating 1 Smoke concentration, m, of the upstream air stream -1 ；
2) And (3) calculating the critical air splitting ratio:
a) Setting the allowable smoke concentration of a tunnel ventilation design to be delta, and if delta is satisfied 1 <δ 2 When the value is less than or equal to delta, the requirement of ventilation design is met, and a formula (4) is obtained by a formula (3):
in the formula: delta is the smoke tolerance of the ventilation design, m -1 ；
b) In equation (4), when the wind-split ratio reaches the critical wind-split ratio, there is δ 2 = delta, and use e as e c Alternatively, the formula (4) is transformed to obtain a calculation formula of the critical air-splitting ratio, which is as the formula (5):
in the formula: delta 1c M is the critical concentration of smoke dust in the upstream wind flow -1 ；e c The critical air splitting ratio is zero dimensional number;
equation (5) shows that: when the air distribution ratio is equal to or greater than the critical air distribution ratio, the concentration of the smoke dust of the parallel air flow in the short tunnel exceeds the allowable concentration, and vehicles running in the short tunnel are unsafe.
In the method for determining the critical wind division ratio of the circulating ventilation system of the extra-long road tunnel, the determination method of the formula (3) is as follows:
a) The general calculation formula of the smoke flow in the highway tunnel is as the formula (6):
in the formula: q VI Is the flow of the smoke and dust in the tunnel, m 2 /s；q VI M is the smoke emission standard 2 /veh·km；f a(VI) The vehicle condition coefficient of the smoke dust is considered, and a dimensionless number is not included; f. of d The density coefficient of the vehicle is the coefficient of the vehicle density,a dimensionless number; f. of h(VI) In order to consider the altitude coefficient and dimensionless number of the smoke dust; f. of iv(VI) In order to consider the longitudinal slope-vehicle speed coefficient of the smoke dust, the method has no dimensional number; n is D The number is the vehicle type number of the diesel vehicle and is a dimensionless number; n is a radical of m Traffic volume of corresponding vehicle type, veh/h; f. of m(VI) The model coefficient of the diesel vehicle considering smoke dust is a dimensionless number; l is the tunnel length, m;
b) In the formula (6), when the reference emission is not changed, and the dimensionless numbers of the vehicle condition, the vehicle density, the gradient, the vehicle speed and the vehicle type of the diesel vehicle are not changed, and the influence caused by the altitude change can be ignored, the tunnel smoke flow is a function of the tunnel length and the comprehensive influence factor; wherein, the calculation formula of the comprehensive influence factor is as the formula (7):
in the formula: c is a comprehensive influence factor of the smoke flow, m/s;
c) Specifically, by applying the formula (7), the calculation formula of the smoke concentration of the upstream air flow is obtained as the formula (8):
in the formula: l is a radical of an alcohol 1 Is the length of the upstream tunnel, m;
d) Calculating the wind distribution ratio:
the wind dividing ratio is determined according to the formula (9):
in the formula: q r For the external fresh air quantity introduced from the tunnel entrance, m 3 /s；
According to the mass conservation principle, the calculation formula of the air volume of the parallel air flow in the short tunnel is as the formula (10):
Q s ＝(1-e)·Q r (10)
in the formula: q s Parallel air flow rate m for short tunnel 3 /s；
e) Calculating the smoke concentration of the parallel wind flow of the short tunnel:
the smoke dust of the parallel air flow of the short tunnel channel comes from two parts, wherein the smoke dust carried by the upstream air flow is in one part; secondly, the amount of smoke and dust generated by the emission of vehicles running in the short tunnel; the upstream wind flow carrying capacity influencing the parallel wind flow smoke dust flow of the short tunnel is determined according to a formula (11):
Q s1(VI) ＝δ 1 Q s (11)
substituting equation (10) into equation (11) to obtain equation (1):
Q s1(VI) ＝δ 1 (1-e)Q r (1)
in addition, the amount of smoke generated by the emission of the vehicle running in the short tunnel road is calculated according to the formula (2):
Q s2(VI) ＝C·L s (2)
according to the basic principle of physics, applying the formulas (10), (1) and (2) to obtain a smoke concentration calculation formula (3) of the parallel wind flow of the tunnel short channel:
compared with the prior art, the invention has the beneficial effects that:
the method can be used for judging the air distribution ratio of the circulating ventilation system of the extra-long highway tunnel, can avoid the complex calculation of parameters with dimension numbers such as the length, the section size and the like of the tunnel, or the network calculation of the ventilation system, or the complicated and time-consuming computational fluid dynamics numerical simulation, and can quickly and quickly determine the ratio of the upstream air flow, the circulating air flow and the parallel air flow; the safety of the vehicle running in the tunnel is ensured.
Drawings
Fig. 1 is a schematic structural view of a circulating ventilation system for an extra-long road tunnel to which the present invention is applied.
Fig. 2 is a wind flow diagram of a circulating ventilation system of an extra-long road tunnel, to which the present invention is applied.
FIG. 3 is a graph showing the effect of concentration ratio on critical split air ratio (fresh air flow rate 300 m) 3 S, factor ratio of 0.1m 2 /s)。
FIG. 4 is a graph showing the effect of concentration ratio on critical split air ratio (fresh air flow rate 300 m) 3 S, factor ratio of 0.2m 2 /s)。
FIG. 5 is a graph showing the effect of concentration ratio on critical split air ratio (fresh air flow rate 400 m) 3 S, factor ratio of 0.1m 2 /s)。
FIG. 6 is a graph showing the influence of concentration ratio on critical split air ratio (fresh air flow rate 400 m) 3 S, factor ratio of 0.2m 2 /s)。
In the figure: A. fresh air flow, upstream air flow, unpurified circulating air flow, purified circulating air flow, downstream air flow, parallel air flow, 0 adjustable auxiliary structure, 1 tunnel inlet, 2 upstream tunnel, 3 induced air section, 4 deduster inlet, 5 circulating air duct, 6 deduster outlet, 7 induced injection section, 8 downstream tunnel, 9 tunnel outlet, 10 tunnel short duct, and 11 deduster.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1 and 2, the circulating ventilation system of the extra-long road tunnel comprises a circulating air duct 5 and an adjustable auxiliary structure 0; the adjustable auxiliary structure 0 comprises an air exhaust vertical shaft and an air supply vertical shaft which are communicated with the circulating air duct 5; the circulating air duct 5 is arranged in a bypass tunnel of the tunnel, the circulating air duct 5 is parallel to the tunnel, and two ends of the circulating air duct 5 are respectively communicated with the tunnel through the induced draft section 3 and the injection section 7. A dust remover 11 is arranged in the circulating air duct 5. An upstream tunnel 2 is arranged between the tunnel inlet 1 and the induced air section 3, a tunnel short passage 10 is arranged between the induced air section 3 and the injection section 7, and a downstream tunnel 8 is arranged between the injection section 7 and the tunnel outlet 9.
When the circulating ventilation system of the tunnel of the extra-long highway is used, fresh air flow A of the environment outside the tunnel is introduced through the tunnel inlet 1 and flows through the upstream tunnel 2 of the circulating air duct to be continuously mixed and carry pollutants such as smoke dust, CO and the like to become upstream air flow B. And a part of the upstream wind flow B flows into the short tunnel channel 10 to continuously dilute the pollutants to form a parallel wind flow F of the circulating wind flow. The other part of the upstream air flow B passes through the induced air section 3 of the circulating air duct and flows into the circulating air duct 5 to become an unpurified circulating air flow C. The unpurified circulating air flow C flows into the inlet 4 of the dust remover, under the combined action of separation, sedimentation and trapping of the dust remover 11, particulate pollutants such as smoke and dust are removed, and the purified circulating air flow C is purified and flows out of the outlet 6 of the dust remover and is converted into a purified circulating air flow D.
In the common section among the injection section 7 of the circulating air duct, the short tunnel passage 10 and the downstream tunnel 8, the purified circulating air flow D flowing through the injection section 7 of the circulating air duct and the parallel air flow F of the circulating air flow flowing through the short tunnel passage 10 are mixed and converted into the downstream air flow E. Downstream tunnel 8, downstream wind flow E continues to dilute the contaminants and ensure that the contaminant concentration in downstream tunnel 8 remains within prescribed safe values, ensuring wind demand.
The method comprises the following specific implementation steps:
1) The general calculation formula of the smoke flow in the highway tunnel is as the formula (6):
in the formula: q VI Is the flow of the smoke and dust in the tunnel, m 2 /s；q VI M is the smoke reference emission 2 /veh·km；f a(VI) The vehicle condition coefficient of the smoke dust is considered, and a dimensionless number is not included; f. of d The coefficient is the density coefficient of the vehicle, and is a dimensionless number; f. of h(VI) In order to consider the altitude coefficient of the smoke dust, the method has no dimensional number; f. of iv(VI) In order to consider the longitudinal slope-vehicle speed coefficient of the smoke dust, the method has no dimensional number; n is a radical of an alkyl radical D The number is the vehicle type number of the diesel vehicle and is a dimensionless number; n is a radical of m The traffic volume is the traffic volume of the corresponding vehicle type, veh/h; f. of m(VI) The model coefficient of the diesel vehicle considering smoke and dust is free of dimensional number; l is the tunnel length, m.
2) In the formula (6), when the reference emission amount is unchanged, and the dimensionless numbers of the vehicle condition, the vehicle density, the gradient, the vehicle speed and the vehicle type of the diesel vehicle are unchanged, and the influence caused by the altitude change can be ignored, the tunnel smoke flow is a function of the tunnel length and the comprehensive influence factor; wherein, the calculation formula of the comprehensive influence factor is as the formula (7):
in the formula: c is a comprehensive influence factor of the smoke flow, m/s.
3) Specifically, by applying the formula (7), the calculation formula of the smoke concentration of the upstream air flow is obtained as the formula (8):
in the formula: delta 1 Smoke concentration, m, of the upstream air stream -1 ；L 1 Is the length of the upstream tunnel, m; q r For the external fresh air quantity introduced from the tunnel entrance, m 3 /s。
4) Calculating the wind distribution ratio:
the wind dividing ratio is determined according to the formula (9):
in the formula: e is the wind ratio, and is a dimensionless number; q is the air flow quantity of the air flow which is divided to the induced draft section of the circulating air duct, m 3 /s；
According to the mass conservation principle, the calculation formula of the air volume of the parallel air flow in the short tunnel is as the formula (10):
Q s ＝(1-e)·Q r (10)
in the formula: q s Parallel air flow rate m for short tunnel 3 /s。
5) Calculating the smoke concentration of the parallel wind flow of the tunnel short channel:
the smoke dust of the parallel air flow of the short tunnel channel comes from two parts, wherein the smoke dust carried by the upstream air flow is in one part; secondly, the amount of smoke and dust generated by the emission of vehicles running in the short tunnel; the upstream air flow carrying capacity of the parallel air flow smoke flow affecting the short tunnel channel is determined according to a formula (11):
Q s1(VI) ＝δ 1 Q s (11)
in the formula: q s1(VI) Is the flow of smoke from the upstream wind stream, m 2 /s；
Substituting equation (10) into equation (11) yields equation (1):
Q s1(VI) ＝δ 1 (1-e)Q r (1)
in addition, the amount of smoke formed by emission of vehicles running in the tunnel short road is calculated according to the formula (2):
Q s2(VI) ＝C·L s (2)
in the formula: q s2(VI) Newly increased smoke flow m in parallel wind flow of short tunnel 2 /s；L s The length of the tunnel short road, m;
according to the basic principle of physics, applying the formulas (10), (1) and (2) to obtain a smoke concentration calculation formula (3) of the parallel wind flow of the tunnel short channel:
in the formula: delta 2 The smoke concentration, m, of the parallel wind flow -1 。
6) Calculating a critical air splitting ratio:
assuming that the allowable concentration of smoke in the tunnel ventilation design is delta, there is a formula (12):
δ 1 <δ 2 ≤δ (12)
the requirements of ventilation design are met;
substituting equation (3) into equation (12) yields equation (4):
if and only if 2 When the value is = delta, the smoke concentration of the upstream wind flow has a critical value delta to meet the smoke concentration requirement of tunnel ventilation design 1c (ii) a Delta in the formula (9) 1 Substitution by delta 1c In combination with e c Replacing e, shifting the term by formula (4) to obtain formula (5):
in the formula: delta 1c M is the critical concentration of smoke dust in the upstream wind flow -1 ；e c The critical air-dividing ratio is a dimensionless number;
formula (5) shows that when the wind distribution ratio is equal to or greater than the critical wind distribution ratio, the smoke concentration of the parallel wind flow in the short tunnel road exceeds the allowable concentration, and the vehicle running in the short tunnel road is unsafe.
Further processing the formula (5) to obtain a formula (13):
in the formula: c = C/delta is the ratio of the comprehensive influence factor of the smoke flow to the design concentration, m 2 /s；RN＝δ 1c The/delta is the concentration ratio of the critical concentration to the designed concentration, and is a dimensionless number;
formula (13) shows that the critical air separation ratio is inversely proportional to the length of the short tunnel and the factor ratio of the tunnel, and the critical air separation ratio is proportional to the ratio of fresh air flow volume to fresh air flow concentration.
The following experiment examples for determining the influence degree of the tunnel short path length, the dependent ratio, the fresh air flow and the concentration ratio on the critical air dividing ratio specifically operate as follows:
a) The flow rates of fresh air flow are respectively 300m 3 S and 400m 3 /s；
b) The set factor ratio numbers are respectively 0.1m 2 S and 0.2m 2 /s；
c) Setting the concentration ratio in the range of 0.50 to 0.95;
d) Setting the lengths of the tunnel short channels as 50m, 70m, 90m, 110m and 130m respectively;
e) The above values are substituted into the formula (13) to calculate, and the results are shown in fig. 3 to 6.
By analyzing the specific embodiments, the following summary is made: (1) the shorter the length of the short tunnel, the larger the critical air distribution ratio; the larger the fresh air flow rate is, the slower the attenuation of the critical air distribution ratio is; the larger the number of the change ratios, the faster the critical wind division ratio changes. (2) The method defines the influence degree of the tunnel short path length, the factor, the fresh air flow and the concentration ratio on the critical air dividing ratio.
Claims (2)
1. A critical wind division ratio judgment method of an extra-long road tunnel circulating ventilation system comprises a circulating air duct and an adjustable auxiliary structure; the adjustable auxiliary structure comprises an air exhaust vertical shaft and an air supply vertical shaft which are communicated with the circulating air duct; the circulating air duct is arranged in a bypass tunnel of the tunnel, and two ends of the circulating air duct are respectively communicated with the tunnel through the air inducing section and the injection section; a dust remover is arranged in the circulating air duct; the part between the tunnel inlet and the induced air section is an upstream tunnel, the part between the induced air section and the injection section is a short tunnel path, and the part between the injection section and the tunnel outlet is a downstream tunnel;
the method comprises the following steps:
1) Calculating the smoke concentration of the parallel wind flow of the circulating wind flow:
a) Calculating the smoke flow from the upstream wind flow according to the formula (1):
Q s1(VI) ＝δ 1 (1-e)Q r (1)
in the formula: q s1(VI) Is the flow of smoke from the upstream air stream, m 2 S; e is the wind ratio, and is a dimensionless number; delta. For the preparation of a coating 1 Is the smoke concentration of the upstream air stream, m -1 ；Q r For the external fresh air quantity introduced from the tunnel entrance, m 3 /s；
b) Calculating the smoke dust flow of the newly added parallel wind flow, wherein the calculation formula is as the formula (2):
Q s2(VI) ＝C·L s (2)
in the formula: q s2(VI) For newly increased smoke flow in parallel wind flow, m 2 /s；L s The length of the short tunnel of the circulating air duct is m; c is a comprehensive influence factor of the smoke flow, m/s;
c) Calculating the smoke concentration of the parallel wind flow, wherein the calculation formula is as formula (3):
in the formula: delta 2 Is the smoke concentration of the parallel wind flow, m -1 (ii) a e is the wind ratio, and is a dimensionless number; delta 1 Smoke concentration, m, of the upstream air stream -1 ；
2) And (3) calculating the critical air splitting ratio:
a) Setting the allowable smoke concentration of the tunnel ventilation design to be delta when delta is satisfied 1 <δ 2 When the value is less than or equal to delta, the requirement of ventilation design is met, and a formula (4) is obtained by a formula (3):
in the formula: delta is the smoke tolerance of the ventilation design, m -1 ；
b) In equation (4), when the wind-split ratio reaches the critical wind-split ratio, there is δ 2 = delta, and use e as e c Alternatively, the formula (4) is transformed to obtain a calculation formula of the critical air-splitting ratio, which is as the formula (5):
in the formula: delta 1c M is the critical concentration of smoke dust in the upstream wind flow -1 ；e c The critical air-dividing ratio is a dimensionless number;
equation (5) shows that: when the wind distribution ratio is equal to or greater than the critical wind distribution ratio, the concentration of the smoke dust of the parallel wind flow in the short tunnel road exceeds the allowable concentration, and the vehicle running in the short tunnel road is unsafe.
2. The method for determining the critical wind division ratio of the circulating ventilation system of the extra-long road tunnel according to claim 1, wherein the determination method of formula (3) is as follows:
a) The general calculation formula of the smoke dust flow in the road tunnel is as the formula (6):
in the formula: q VI Is the flow of the smoke and dust in the tunnel, m 2 /s；q VI M is the smoke emission standard 2 /veh·km；f a(VI) The vehicle condition coefficient of the smoke dust is considered, and a dimensionless number is not included; f. of d The density coefficient of the vehicle is a dimensionless number; f. of h(VI) In order to consider the altitude coefficient of the smoke dust, the method has no dimensional number; f. of iv(VI) In order to consider the longitudinal slope-vehicle speed coefficient of the smoke dust, dimensionless numbers are not needed; n is D The number is the vehicle type number of the diesel vehicle and is a dimensionless number; n is a radical of m Traffic volume of corresponding vehicle type, veh/h; f. of m(VI) The model coefficient of the diesel vehicle considering smoke and dust is free of dimensional number; l is the tunnel length, m;
b) In the formula (6), when the reference emission is not changed, and the dimensionless numbers of the vehicle condition, the vehicle density, the gradient, the vehicle speed and the vehicle type of the diesel vehicle are not changed, and the influence caused by the altitude change can be ignored, the tunnel smoke flow is a function of the tunnel length and the comprehensive influence factor; wherein, the calculation formula of the comprehensive influence factor is as the formula (7):
in the formula: c is a comprehensive influence factor of the smoke flow, m/s;
c) Specifically, by applying the formula (7), the calculation formula of the smoke concentration of the upstream wind flow is obtained as the formula (8):
in the formula: l is 1 Is the length of the upstream tunnel, m;
d) Calculating the wind distribution ratio:
the wind distribution ratio is determined according to the formula (9):
in the formula: q is the air flow quantity of the air flow which is divided to the induced draft section of the circulating air duct, m 3 /s；
According to the mass conservation principle, the calculation formula of the air volume of the parallel air flow in the short tunnel is as the formula (10):
Q s ＝(1-e)·Q r (10)
in the formula: q s Parallel air flow rate m for short tunnel 3 /s；
e) Calculating the smoke concentration of the parallel wind flow of the short tunnel:
the smoke dust of the parallel air flow of the short tunnel channel comes from two parts, wherein the smoke dust carried by the upstream air flow is in one part; secondly, the amount of smoke and dust generated by the emission of vehicles running in the short tunnel; the upstream wind flow carrying capacity influencing the parallel wind flow smoke dust flow of the short tunnel is determined according to a formula (11):
Q s1(VI) ＝δ 1 Q s (11)
substituting equation (10) into equation (11) to obtain equation (1):
Q s1(VI) ＝δ 1 (1-e)Q r (1)
in addition, the amount of smoke formed by emission of vehicles running in the tunnel short road is calculated according to the formula (2):
Q s2(VI) ＝C·L s (2)
according to the basic principle of physics, applying the formulas (10), (1) and (2) to obtain a smoke concentration calculation formula (3) of the parallel wind flow of the tunnel short channel:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810903631.2A CN109033675B (en) | 2018-08-09 | 2018-08-09 | Critical wind division ratio judgment method of circulating ventilation system of extra-long highway tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810903631.2A CN109033675B (en) | 2018-08-09 | 2018-08-09 | Critical wind division ratio judgment method of circulating ventilation system of extra-long highway tunnel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109033675A CN109033675A (en) | 2018-12-18 |
| CN109033675B true CN109033675B (en) | 2022-12-09 |
Family
ID=64632487
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810903631.2A Active CN109033675B (en) | 2018-08-09 | 2018-08-09 | Critical wind division ratio judgment method of circulating ventilation system of extra-long highway tunnel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109033675B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11311098A (en) * | 1998-04-30 | 1999-11-09 | Ebara Corp | Ventilating system for long and large tunnel |
| CN101429870A (en) * | 2008-12-04 | 2009-05-13 | 浙江省交通规划设计研究院 | Fan setting method for road tunnel multi-silo system |
| CN103278435A (en) * | 2013-06-14 | 2013-09-04 | 湖南科技大学 | Fume detection and ventilation device for road tunnel |
| CN205297617U (en) * | 2015-11-25 | 2016-06-08 | 天津瑞茂名果科技有限公司 | A air purification ventilation unit for tunnel |
| 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 |
-
2018
- 2018-08-09 CN CN201810903631.2A patent/CN109033675B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11311098A (en) * | 1998-04-30 | 1999-11-09 | Ebara Corp | Ventilating system for long and large tunnel |
| CN101429870A (en) * | 2008-12-04 | 2009-05-13 | 浙江省交通规划设计研究院 | Fan setting method for road tunnel multi-silo system |
| CN103278435A (en) * | 2013-06-14 | 2013-09-04 | 湖南科技大学 | Fume detection and ventilation device for road tunnel |
| CN205297617U (en) * | 2015-11-25 | 2016-06-08 | 天津瑞茂名果科技有限公司 | A air purification ventilation unit for tunnel |
| 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 |
Non-Patent Citations (2)
| Title |
|---|
| 《Influence of mechanical ventilation-shaft connecting location on subwaytunnelventilationperformance》;Makhsuda Juraeva，et al;《Journal of Wind Engineering and Industrial Aerodynamics》;20131231;全文 * |
| 《隧道风对隧道火灾烟气扩散的影响研究》;吴世先等;《铁道科学与工程学报》;20170430;全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109033675A (en) | 2018-12-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109057849B (en) | Downstream tunnel length extreme value determination method for open ventilation system of extra-long highway tunnel | |
| Kreith et al. | Pressure drop and flow characteristics of short capillary tubes at low Reynolds numbers | |
| CN108800175A (en) | A kind of large size flue Three-dimensional Flow homogenization method and device | |
| CN105352723A (en) | Engine on-line oil-gas separator evaluating device | |
| Juraeva et al. | Influence of mechanical ventilation-shaft connecting location on subway tunnel ventilation performance | |
| CN109002573B (en) | Method for judging applicability of circulating ventilation system of extra-long highway tunnel | |
| CN109033675B (en) | Critical wind division ratio judgment method of circulating ventilation system of extra-long highway tunnel | |
| CN109026114B (en) | downstream tunnel length extreme value determination method for closed ventilation system of extra-long highway tunnel | |
| CN109057848B (en) | method for determining maximum value of wind ratio number of closed type circulation ventilation of extra-long road tunnel | |
| CN108229013B (en) | A kind of full ventilation by force draft required airflow computational methods in Ramp urban road tunnel | |
| CN108979697B (en) | The air-supply vertical shaft fresh-air volume reduction coefficient calculation method of tunnel open circulation ventilation | |
| KR20200065075A (en) | How to calculate the amount of energy saved in open, controllable circulating ventilation in long-distance road tunnels | |
| Ma et al. | Transient aerodynamic forces of a vehicle passing through a bridge tower’s wake region in crosswind environment | |
| CN109184796B (en) | Method for detecting gas concentration through gas emission quantity of air pipe orifice of tunnel face of main tunnel | |
| CN108999628B (en) | The critical effective wind rate determination method of the deduster of the vcehicular tunnel closed system of ventilation | |
| CN105279334B (en) | Particulate matter settling amount evaluation method in aircraft loop system based on general simplified model | |
| CN109057851B (en) | The critical effective wind rate determination method of the deduster of vcehicular tunnel open-circuit ventilation system | |
| CN108952789B (en) | Energy-saving amount calculation method for closed type controllable circulating ventilation of extra-long road tunnel | |
| CN109083671B (en) | Fresh-air volume reduction coefficient calculation method after the purification of tunnel closed cycle ventilation | |
| CN108716419B (en) | A kind of urban road tunnel ring road collaboration method of ventilation | |
| CN108915753B (en) | The short-track length bounding method in tunnel for Extra-long Highway Tunnel circulating ventilation system | |
| CN109083672B (en) | Upstream tunnels length bounding method for Extra-long Highway Tunnel circulating ventilation system | |
| CN118052025A (en) | Method for determining length extremum of downstream inclined shaft of purification ventilation system for slag transportation process of inclined shaft | |
| Šekularac et al. | Experimental and numerical analysis of flow field and ventilation performance in a traffic tunnel ventilated by axial fans | |
| CN113482690B (en) | Calculation method for air distribution of tunnel ventilation system of ramp air exhaust type single-ramp highway |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |