CN103557898A - Method for measuring flow of turbulent fluid in roadway based on key ring - Google Patents
Method for measuring flow of turbulent fluid in roadway based on key ring Download PDFInfo
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- CN103557898A CN103557898A CN201310546143.8A CN201310546143A CN103557898A CN 103557898 A CN103557898 A CN 103557898A CN 201310546143 A CN201310546143 A CN 201310546143A CN 103557898 A CN103557898 A CN 103557898A
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- 239000012530 fluid Substances 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000005516 engineering process Methods 0.000 abstract description 7
- 239000003245 coal Substances 0.000 description 10
- 238000009423 ventilation Methods 0.000 description 10
- 238000004880 explosion Methods 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000005259 measurement Methods 0.000 description 7
- 238000005065 mining Methods 0.000 description 7
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- 239000002817 coal dust Substances 0.000 description 4
- 230000002265 prevention Effects 0.000 description 3
- 230000000739 chaotic effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 208000031968 Cadaver Diseases 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 206010035653 pneumoconiosis Diseases 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
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Abstract
The invention discloses a method for measuring the flow of turbulent fluid in a roadway based on a key ring. The method comprises the following steps of firstly determining the section shape of the roadway, and determining an average wind speed key ring according to the section shape of the roadway; then measuring wind speed at any point on the key ring to obtain average wind speed on a section, and calculating the flow of the fluid in the roadway according to the average wind speed. The method is a new technology for simply and accurately measuring the flow of the fluid in the roadway.
Description
Technical field
The present invention relates to turbulent fluid flow measurement technology in a kind of coal mine roadway, relate in particular to turbulent fluid flow-measuring method in a kind of tunnel based on key ring.
Background technology
Coal resources are the important energy sources of Dou Shi China all the time, and coal proportion in primary energy production and consumption remains on more than 60% always, therefore the dynamics of its exploitation is maximum.Because the strip mining transformation colliery of China is less, wherein 92% coal production is underground mining, and through exploitation for many years, superficial part mineral resources are day by day exhausted, the exploitation of mineral resources more and more develops in depth, at present annual probably with the speed of 20 meters to downward-extension.In China's 724 place's State owned coal mines, coal and gas outburst mine 154 places, account for 21.3% simultaneously; Gassy mine 152 places, account for 21.0%.Along with the increasing of mining intensity and the increase of mining depth, in the development end in each stage casing, down-hole, the degree of Gas and gathering is also increasing, and blasts under certain condition and burn.Coal dust is also the product of underground coal recovery process, and underground work personnel are long-term to be sucked excessive dust and can cause pneumoconiosis, and coal dust while reaching certain concentration in air, meets burning things which may cause a fire disaster dust explosion easily occurs.In addition, the operational situation of each electric appliances, plant equipment is bad, electrical network is short-circuited and naked light etc., and also may ignite travelling belt, cable and wooden timbering, cause exogenous mine fire.Therefore the increase of mining intensity and the degree of depth will inevitably cause other relevant accidents such as even more serious gas explosion, fire, dust accident, and the safety in production of down-hole, staff's life and health and Accident prevention in serious threat.
Taking place frequently to mine ventilation system of coal mining accident, has also proposed more and more higher requirement.Ventilating system is the very important backup system of mine, and it is prevention and administers various disasters, realizes the basic means of Safety of Coal Mine Production.The object of mine ventilation is for the staff of down-hole and variously with wind field, provides enough fresh distinguished and admirable, dilution or water down occur along with mining various poisonous, harmful, damp and dust, guarantee the fair-weather conditions in borehole operation space, for underground work personnel set up the work situation of safety and comfort.Fact proved, the success or failure close relation of the security critical production key factors such as the quality of mine ventilation system and gas accident, fire, treating flour dust, the major accident in many collieries is all managed improperly with ventilating system or is designed the unreasonable important relationship that has.Particularly gas (coal dust) blast, fire failure, this two classes accident is the casualty accident that coal master wants always, and all has close relationship with ventilating management, it is the main remote cause that causes the accident and occur that ventilating management is not good at.Gas and dust explosion accident once occurred repeatedly in history, were all because improper ventilation is caused.As great especially gas explosion accident occurs colliery, Panzhihua City Xiao Jia gulf, 29， in August, 2012 Sichuan Province, cause that 45 people are dead, 1 people is missing, 54 people are injured.This accident is exactly that the reliability that ventilating system does not have is poor because ventilating management is chaotic, and the tunnel of air return system is seriously in bad repair, thereby the not enough institute of effective wind rate is caused.On April 16th, 2007, there is great especially gas explosion accident in Wang Zhuan colliery, Pingdingshan City, Henan Province, dead 31 people in down-hole, hinders 9 Ren， ambulance corps, in rescue process, subsequent explosion occurs, and causes 15 rescue team members injured.This accident is also that auxiliary fan blowing-out 1 month, makes the methane accumulation of overflowing and reach explosion ratio and run into naked light to cause gas explosion because ventilating management is chaotic, and coal dust has also participated in blast simultaneously.The especially big gas explosion accident that occurs in wood coombe dead 164 people in ore deposit of Guizhou Province for 2000 is also because field management is not good at having occurred due to recirculating air.Therefore mine ventilation plays vital effect in safety in production.
Yet China still has most mine ventilation systems to build imperfection at present, lacks the monitoring for ventilating system, cannot effectively guarantee the air quantity of relevant tunnel, down-hole and getting working face.Therefore, research mine laneway air quantity Measurement accuracy technology and method, all had very important significance in normal production period and the period that has an accident.
In the measuring method of tunnel fluid flow in the prior art, conventionally adopt to be that homalographic is around-France ask for mean flow rate or by the mathematical relation of Peak Flow Rate and mean flow rate, calculate cross section mean flow rate again by recording cross section Peak Flow Rate, the former measurements and calculations are all comparatively loaded down with trivial details, and the latter generally adopts the measurement of semiempirical formula and Peak Flow Rate also to have certain error.
Summary of the invention
The object of this invention is to provide a kind of simply, turbulent fluid flow-measuring method in the tunnel based on key ring accurately.
The object of the invention is to be achieved through the following technical solutions:
Turbulent fluid flow-measuring method in tunnel based on key ring of the present invention, comprises step:
First, determine the cross sectional shape in tunnel, then according to the cross sectional shape in tunnel, determine its crucial ring, the wind speed at described crucial ring place equals the mean wind speed on cross section, described tunnel;
Then, by measuring the wind speed of the upper arbitrfary point of crucial ring, the average wind obtaining on this cross section hastens, and can calculate the flow of fluid in tunnel according to mean wind speed.
As seen from the above technical solution provided by the invention, turbulent fluid flow-measuring method in the tunnel based on key ring that the embodiment of the present invention provides, due to the velocity distribution on pipeline section according to turbulent fluid in tunnel, determine the distribution curve of mean flow velocity value on cross section, be velocity distribution " crucial ring ", by measuring the velocity amplitude of " crucial ring " upper arbitrfary point, just can obtain the mean flow velocity value on this cross section, can calculate the fluid flow in tunnel, be a kind of new technology of simple, Measurement accuracy tunnel fluid flow.
Accompanying drawing explanation
Fig. 1 a is the position view of the key ring of trapezoid cross section in the embodiment of the present invention;
Fig. 1 b is the areal distribution schematic diagram of the key ring of trapezoid cross section in the embodiment of the present invention;
Fig. 2 a is the position view of the key ring in three-centered arch cross section in the embodiment of the present invention;
Fig. 2 b is the areal distribution schematic diagram of the key ring in three-centered arch cross section in the embodiment of the present invention.
Embodiment
To be described in further detail the embodiment of the present invention below.
Turbulent fluid flow-measuring method in tunnel based on key ring of the present invention, its preferably embodiment be:
Comprise step:
First, determine the cross sectional shape in tunnel, then according to the cross sectional shape in tunnel, determine its crucial ring, the wind speed at described crucial ring place equals the mean wind speed on cross section, described tunnel;
Then, by measuring the wind speed of the upper arbitrfary point of crucial ring, the average wind obtaining on this cross section hastens, and can calculate the flow of fluid in tunnel according to mean wind speed.
For trapezoid cross section, determine bottom side length on it, the length of side of going to the bottom and height, the position of calculating its crucial ring according to following table:
For three-centered arch cross section, determine the high and three-centered arch of the three-core arch wall length of side of going to the bottom, according to following table, calculate its crucial position of encircling:
Turbulent fluid flow-measuring method in tunnel based on key ring of the present invention, velocity distribution according to turbulent fluid in tunnel on pipeline section, determine the distribution curve of mean flow velocity value on cross section, be velocity distribution " crucial ring ", by measuring the velocity amplitude of " crucial ring " upper arbitrfary point, just can obtain the mean flow velocity value on this cross section, can calculate the fluid flow in tunnel, be a kind of new technology of simple, Measurement accuracy tunnel fluid flow.
Specific embodiment:
First, determine the shape in tunnel, then according to the shape in tunnel, by relationship, determine its " crucial ring ".
As shown in Fig. 1 a, 1b, for trapezoid cross section, determine bottom side length on it, the length of side of going to the bottom and height, the position of calculating its crucial ring according to table 1:
Table 1 trapezoid cross section " crucial ring " secular equation
In above formula: b---trapezoidal upper bottom side length, m; C---the trapezoidal length of side of going to the bottom, m; H---trapezoidal height, m; X---the corresponding horizontal ordinate of crucial ring, m; Y---the corresponding ordinate of crucial ring, m; F (x)---crucial ring secular equation, y value.
Utilize above-mentioned relation formula to calculate the position of its crucial ring.
As shown in Fig. 2 a, 2b, for three-centered arch cross section, determine the high and three-centered arch of the three-core arch wall length of side of going to the bottom, according to table 2, calculate its crucial position of encircling:
Table 2 three-centered arch cross section " crucial ring " secular equation
In above formula: h---three-core arch wall is high, m; D---the three-centered arch cross section length of side of going to the bottom, m; r
1---three-centered arch cross section top arc radius, m; X---the corresponding horizontal ordinate of crucial ring, m; Y---the corresponding ordinate of crucial ring, m; F (x)---crucial ring secular equation, y value.
Utilize above-mentioned relation formula to calculate the position of its crucial ring.
Then, measurement of correlation device is arranged on to crucial ring position, can measures the mean wind speed in this cross section.By " crucial ring " theory, can more accurately record the mean wind speed in tunnel, can to air velocity transducer, alarming value be set according to the predetermined value of inherent normal ventilation its wind speed in period in each tunnel and air quantity simultaneously, if blower fan is stopped transport, blower fan air supply ability is not enough, wind speed is too low, down-hole air velocity transducer just can send sound and light alarm, by the ventilation monitoring software at ground monitoring center, under monitor well that can be real-time, the variation of wind speed and air quantity in each tunnel, can realize effective management of whole mine ventilation system and the prevention of accident." crucial ring " technology provides theoretical foundation and technological guidance for the ventilation monitoring system in the Internet of Things construction of whole mine simultaneously.
The above; be only the present invention's embodiment preferably, but protection scope of the present invention is not limited to this, is anyly familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.
Claims (3)
1. a turbulent fluid flow-measuring method in the tunnel based on key ring, is characterized in that, comprises step:
First, determine the cross sectional shape in tunnel, then according to the cross sectional shape in tunnel, determine its crucial ring, the wind speed at described crucial ring place equals the mean wind speed on cross section, described tunnel;
Then, by measuring the wind speed of the upper arbitrfary point of crucial ring, the average wind obtaining on this cross section hastens, and can calculate the flow of fluid in tunnel according to mean wind speed.
2. turbulent fluid flow-measuring method in the tunnel based on key ring according to claim 1, is characterized in that, for trapezoid cross section, determines bottom side length on it, the length of side of going to the bottom and height, the position of calculating its crucial ring according to following table:
In above formula: b---trapezoidal upper bottom side length, m; C---the trapezoidal length of side of going to the bottom, m; H---trapezoidal height, m; X---the corresponding horizontal ordinate of crucial ring, m; Y---the corresponding ordinate of crucial ring, m; F (x)---crucial ring secular equation, y value.
3. turbulent fluid flow-measuring method in the tunnel based on key ring according to claim 1, is characterized in that, for three-centered arch cross section, determines the high and three-centered arch of the three-core arch wall length of side of going to the bottom, and according to following table, calculates its crucial position of encircling:
In above formula: h---three-core arch wall is high, m; D---the three-centered arch cross section length of side of going to the bottom, m; r
1---three-centered arch cross section top arc radius, m; X---the corresponding horizontal ordinate of crucial ring, m; Y---the corresponding ordinate of crucial ring, m; F (x)---crucial ring secular equation, y value.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109085379A (en) * | 2018-06-27 | 2018-12-25 | 中煤科工集团重庆研究院有限公司 | Tunnel mean wind speed measurement method |
| CN110398612A (en) * | 2019-07-22 | 2019-11-01 | 北京奥世欣创科技有限公司 | The measuring and monitoring method of ventilation quantity in a kind of tunnel |
Citations (4)
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|---|---|---|---|---|
| US5153665A (en) * | 1991-06-14 | 1992-10-06 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Vaporizing particle velocimeter |
| CN102706532A (en) * | 2012-06-01 | 2012-10-03 | 华南理工大学 | Method for measuring uniformity of wind field in wind tunnel |
| CN102852555A (en) * | 2012-05-31 | 2013-01-02 | 山东科技大学 | Advanced prediction method of single-alley tunneling gas outburst |
| CN103148007A (en) * | 2012-11-27 | 2013-06-12 | 洛阳源创电气有限公司 | Mine ventilating fan control system capable of automatically adjusting air quantity |
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2013
- 2013-11-06 CN CN201310546143.8A patent/CN103557898B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5153665A (en) * | 1991-06-14 | 1992-10-06 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Vaporizing particle velocimeter |
| CN102852555A (en) * | 2012-05-31 | 2013-01-02 | 山东科技大学 | Advanced prediction method of single-alley tunneling gas outburst |
| CN102706532A (en) * | 2012-06-01 | 2012-10-03 | 华南理工大学 | Method for measuring uniformity of wind field in wind tunnel |
| CN103148007A (en) * | 2012-11-27 | 2013-06-12 | 洛阳源创电气有限公司 | Mine ventilating fan control system capable of automatically adjusting air quantity |
Non-Patent Citations (1)
| Title |
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| 李宗翔，王天明，贾进章: "矿井巷道中外源气体运移-弥散过程仿真研究", 《中国矿业大学学报》, vol. 42, no. 5, 30 September 2013 (2013-09-30) * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109085379A (en) * | 2018-06-27 | 2018-12-25 | 中煤科工集团重庆研究院有限公司 | Tunnel mean wind speed measurement method |
| CN110398612A (en) * | 2019-07-22 | 2019-11-01 | 北京奥世欣创科技有限公司 | The measuring and monitoring method of ventilation quantity in a kind of tunnel |
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