CN109990971B - Pressure-variable wind resistance determination experimental device and method - Google Patents
Pressure-variable wind resistance determination experimental device and method Download PDFInfo
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- E—FIXED CONSTRUCTIONS
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- E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
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- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
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Abstract
The invention belongs to the technical field of mine ventilation, and discloses a pressure-variable wind resistance determination experimental device and a method, wherein the device comprises an upper computer, a ventilation device and a pressure varying device, the ventilation device comprises an annular closed pipeline and a fan arranged in the annular closed pipeline, a plurality of groups of gas parameter measuring devices are uniformly arranged along the annular closed pipeline, the pressure varying device comprises a pressure source, a constant-pressure storage tank and a pressure-regulating storage tank, the pressure source, the constant-pressure storage tank and the pressure-regulating storage tank are sequentially communicated, a pressure-regulating electromagnetic valve is arranged between the constant-pressure storage tank and the pressure-regulating storage tank, a manual vent valve is arranged between the pressure-regulating storage tank and the annular closed pipeline, a pressure sensor is arranged in the pressure-regulating storage tank, and the gas parameter measuring; the invention researches the change of the atmospheric pressure to the friction resistance coefficient from practical factors, directly determines the friction resistance coefficient, and further determines the friction wind resistance in high and low pressure environments.
Description
Technical Field
The invention belongs to the technical field of mine ventilation, and particularly relates to a pressure-variable wind resistance measurement experimental device and method.
Background
Since the 21 st century, with the entrance of various electrified and mechanized equipment into the mining industry, the scale of underground resource exploitation is continuously enlarged, and the southeast shallow underground resources and the northeast open-air resources which are easy to exploit cannot meet the huge demands of heavy industrial enterprises in China on resources, so that the increase of exploitation of high altitude in the west and underground deep areas in the south is an urgent need. Mine ventilation is the most main technical means for guaranteeing mine safety mining, but with the expansion of mining scale, mining trend develops towards higher and deeper direction, so that great change of atmospheric pressure environment is brought, change of roadway friction resistance coefficient is caused, sudden change of friction windage is caused, troubles are caused to mine ventilation, and even underground disasters are caused seriously.
The friction resistance coefficient of the mine roadway is determined by two methods of actual measurement and table lookup. The roadway friction resistance coefficient value measured by an actual measuring method can reflect the resistance characteristic of the mine roadway. But the measurement environment is poor, the workload is large, more measurement personnel are needed, the coordination work is difficult, and the normal production work of a mine is necessarily influenced in the measurement process. The table look-up method is simple and easy to operate, but the friction resistance coefficient of the roadway adopted by the mine ventilation design in China is formulated in the last 80 th century. The mine laneway friction resistance coefficient values are different due to different mine landform characteristics and different occurrence conditions of coal. Even if the same kind of supporting type tunnel of same ore, also because of the influence such as section, length of tunnel, the mine tunnel frictional resistance coefficient also has very big difference. The development of the coal mine industry in China over decades, besides great changes in the aspects of well type, scale, roadway arrangement, supporting structures and the like, the whole mine is developed towards higher and deeper direction, and the existing roadway friction resistance coefficient table is not advanced with time, is updated in time and cannot be completely adapted to the actual situation at present.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a pressure-variable wind resistance measurement experimental device and a method, and the technical scheme is as follows:
the utility model provides a press and become windage survey experimental apparatus, includes host computer, ventilation unit and potential device, ventilation unit includes the airtight pipeline of annular and sets up in the inside fan of the airtight pipeline of annular, follows the airtight pipeline of annular evenly is provided with multiunit gas parameter measuring device, potential device is used for adjusting the atmospheric pressure in the airtight pipeline of annular for the windage characteristic of the airtight pipeline of annular under the different atmospheric pressure circumstances of test, potential device includes pressure source, level pressure storage tank, pressure regulating storage tank, pressure source, level pressure storage tank and pressure regulating storage tank communicate in proper order, are provided with the pressure regulating solenoid valve between level pressure storage tank and the pressure regulating storage tank, and the pressure regulating storage tank is provided with the relief valve, is provided with manual breather valve between pressure regulating storage tank and the airtight pipeline of annular, is provided with baroceptor in the pressure regulating storage tank, gas parameter measuring device, The pressure relief valve and the fan are electrically connected with the upper computer, the rotating speed of the fan is controlled by the upper computer, the collected data are transmitted to the upper computer by the air pressure sensor, and the upper computer controls the opening or closing of the pressure regulating electromagnetic valve and the pressure relief valve according to the received air pressure data.
The gas parameter measuring device comprises a multifunctional parameter tester and a micro differential pressure meter.
The annular closed pipeline is made of metal materials and is formed by connecting a plurality of sections of metal pipelines end to end, adjacent metal pipelines are connected through flange joints, each flange joint comprises a connecting flange, a positioning sealing ring and a sealing ring which are arranged on the outer surface of the adjacent metal pipeline respectively, the outer wall of each metal pipeline between every two connecting flanges is sleeved with the corresponding positioning sealing ring, the two adjacent metal pipelines are coaxially arranged with the corresponding positioning sealing ring, sealing is achieved between the two ends of each positioning sealing ring and the two connecting flanges through the sealing rings, and the connecting flanges at the two ends of the adjacent metal pipelines are fixed through bolts.
The positioning sealing ring is provided with a positioning detection hole, a pitot tube is assembled in the positioning detection hole, and the gas parameter measuring device is communicated with the inside of the annular closed pipeline through the pitot tube.
The installation angle of the fan blades of the fan is 30 degrees, 45 degrees or 60 degrees.
Preferably, the fan blade of the fan has a mounting angle of 60 °.
The constant pressure storage tank is also provided with an exhaust valve.
The utility model provides a pressure becomes windage and hinders survey experimental apparatus, adopts aforementioned a pressure becomes windage and hinders survey experimental apparatus, includes the following step:
step 1, adjusting the pressure in the annular closed pipeline to a value required by an experiment by using a pressure changing device;
step 3, measuring the wind speed v of the experimental test section and the on-way resistance h at two ends of the experimental test section by using the gas parameter measuring devicefAnd recording experimental data;
step 5, repeating the steps 1 to 3 to obtain a plurality of groups of experimental data under different pressures;
step 6, processing the experimental data, calculating the friction resistance coefficient of the experimental test section under different pressure conditions, and finally obtaining the relation between the pressure and the friction resistance coefficient;
step 6.1, calculating the gas flow of the experimental test section by the following formula:
Q＝Sv
wherein Q is the unit time flow of gas in the experimental test section, m3/s；
S is the sectional area of the annular closed pipeline, m2；
v is the average velocity of the gas in the experimental test section, m/s;
step 6.2, calculating the friction wind resistance of the experimental test section according to the following formula:
R＝hf/Q2
wherein R represents the frictional wind resistance of the experimental test section, kg/m7；
hfRepresenting the on-way frictional resistance, Pa, of the experimental test section;
q is the flow rate of gas in the experimental test section per unit time m3/s；
Step 6.3, calculating the friction resistance coefficient of the experimental test section by the following formula:
α＝R·S3/L·U
wherein α represents the frictional resistance coefficient in kg/m of the experimental test section3；
R represents the frictional wind resistance of the experimental test section, kg/m7；
S is the sectional area of the annular closed pipeline, m2；
L represents the length of the experimental test segment, m;
u represents the perimeter, m, of the inner wall of the experimental test section;
and 6.4, repeating the steps 6.1 to 6.4 until the friction resistance coefficient of the test section of the experiment under all pressure conditions of the experiment is calculated, and establishing a fitting equation of the pressure and the friction resistance coefficient alpha to obtain the relation between the pressure and the friction resistance coefficient alpha.
Compared with the prior art, the invention has the beneficial effects that:
the invention researches the change of the atmospheric pressure to the friction resistance coefficient from practical factors, directly determines the friction resistance coefficient, and further determines the friction wind resistance in high and low pressure environments. On one hand, the repeated workload and labor intensity in the actual engineering can be reduced, the aim of saving manpower and material resources is achieved, on the other hand, the method is a huge premise for establishing real-time calculation of a ventilation network for research, and has great significance.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at B;
FIG. 3 is an enlarged view of a portion of FIG. 1 at C;
FIG. 4 is a schematic structural view of a flange joint according to the present invention;
FIG. 5 is a schematic view of a fan mounting structure according to the present invention;
FIG. 6 is a schematic view of an installation structure of a pitot tube and a gas parameter measuring device according to the present invention;
FIG. 7 is a schematic view of the process of the present invention for increasing the pressure of the annular sealing pipe by the transformer;
FIG. 8 is a schematic view of the process of depressurizing the annular sealing pipeline by the pressure varying device of the present invention.
Wherein: an upper computer 1; an annular closed duct 21; a fan 22; a ventilation device 2; a voltage transformation device 3; a flange joint 4; a connecting flange 41; the positioning seal ring 42; a seal ring 43; a pitot tube 44; a gas parameter measuring device 45.
Detailed Description
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
As shown in fig. 1 to 6, the invention provides a pressure-variable wind resistance measurement experimental device, which comprises an upper computer 1, a ventilation device 2 and a pressure-variable device 3, wherein the ventilation device 2 comprises an annular closed pipeline 21 and a fan 22 arranged inside the annular closed pipeline 21, a plurality of groups of gas parameter measuring devices 45 are uniformly arranged along the annular closed pipeline 21, the pressure-variable device 3 is used for adjusting the air pressure in the annular closed pipeline 21 and testing the wind resistance characteristics of the annular closed pipeline 21 under different air pressure conditions, the pressure-variable device 3 comprises a pressure source, a constant-pressure storage tank and a pressure-regulating storage tank, the pressure source, the constant-pressure storage tank and the pressure-regulating storage tank are sequentially communicated, the pressure source is specifically an air pumping and inflating dual-purpose air pump, a pressure-regulating electromagnetic valve is arranged between the constant-pressure storage tank and the pressure-regulating storage tank, a pressure-releasing valve is arranged between the, be provided with baroceptor and buzzer in the pressure regulating storage tank, gas parameter measuring device 45, baroceptor, buzzer, pressure regulating solenoid valve, relief valve, fan 22 are connected with host computer 1 electricity, and through the rotational speed of host computer 1 control fan 22, the data transmission that baroceptor will collect to host computer 1, and host computer 1 is according to opening or closing of received atmospheric pressure data control pressure regulating solenoid valve and relief valve.
Specifically, the upper computer 1 comprises a fan console and a transformer device console, the fan 22 specifically comprises a servo motor and fan blades, the servo motor and the fan console are specifically assembled by an alternating current servo motor of 110ST-M06030 model, a control chip of the transformer device console is Mitsubishi FX2N series plc, and the air pressure sensor is specifically a loose DP-100Y pressure sensor.
The working principle and the flow of the transformer device 3 are as follows:
1. as shown in FIG. 7, when the pressure in the closed-loop sealed pipe 21 is to be adjusted to a certain value P higher than the atmospheric pressure1(0.1Mpa＜P1Less than 0.2Mpa), firstly, the air pump is started to store the air source pressure of the constant-pressure storage tank, so that the air pressure in the constant-pressure storage tank is greater than P1；
The pressure regulating solenoid valve is controlled by the pressure changing device console to be opened, the pressure regulating storage tank is regulated, the pressure sensor transmits collected pressure data to the pressure changing device console, and when the pressure in the pressure regulating storage tank reaches P1When the pressure regulating device is used, the pressure changing device console controls the buzzer to alarm, the manual vent valve is manually opened at the moment, the annular closed pipeline 21 and the pressure regulating storage tank are in a communicated state until the air pressure of the annular closed pipeline 21 and the pressure regulating storage tank is equal, and therefore the air pressure in the annular closed pipeline 21 is equal to P1。
If the manual vent valve is not opened in time, the pressure in the pressure regulating storage tank is higher than P1The pressure sensor can transmit collected pressure data to the pressure changing device control console, the pressure changing device control console controls the pressure relief valve to be opened, and the pressure in the pressure adjusting storage tank is reduced, so that the purpose of self-balancing of the pressure in the pressure adjusting storage tank is achieved.
2. As shown in FIG. 8, when the pressure in the closed-loop sealed duct 21 is to be adjusted to a certain value P lower than the atmospheric pressure2(0.05Mpa＜P2Less than 0.1Mpa), firstly, the air pump is started to store the air source pressure of the constant-pressure storage tank, so that the air pressure in the constant-pressure storage tank is less than P2；
The pressure regulating solenoid valve is controlled by the pressure changing device console to be opened, the pressure regulating storage tank is regulated, the pressure sensor transmits collected pressure data to the pressure changing device console, and when the pressure in the pressure regulating storage tank reaches P2When the pressure regulating device is used, the pressure changing device console controls the buzzer to alarm, the manual vent valve is manually opened at the moment, the annular closed pipeline 21 and the pressure regulating storage tank are in a communicated state until the air pressure of the annular closed pipeline 21 and the pressure regulating storage tank is equal, and therefore the air pressure in the annular closed pipeline 21 is equal to P2。
If the manual vent valve is not opened in time, the pressure in the pressure regulating storage tank is adjustedPressure lower than P2The pressure sensor can transmit collected pressure data to the pressure changing device control console, the pressure changing device control console controls the pressure relief valve to be opened, pressure in the pressure adjusting storage tank is improved, and therefore the purpose of self-balancing of pressure in the pressure adjusting storage tank is achieved.
The gas parameter measuring device 45 includes a multifunctional parameter tester and a micro differential pressure gauge.
Specifically, the pitot tube 44 is specifically an L-shaped pitot tube, one end of the pitot tube positioned inside the annular closed pipeline 21 is opposite to the flowing direction of the gas in the annular closed pipeline 21, the gas parameter measuring device 45 is specifically a TSI 9565-P multifunctional ventilation meter, and the differential pressure gauge is specifically an APG M7000 differential pressure gauge.
The annular closed pipeline 21 is made of metal materials and is formed by connecting a plurality of sections of metal pipelines end to end, the adjacent metal pipelines are connected through the flange joints 4, the flange joints 4 comprise connecting flanges 41, positioning sealing rings 42 and sealing rings 43 which are respectively arranged on the outer surfaces of the adjacent metal pipelines, the outer wall of each metal pipeline between the two connecting flanges 41 is provided with the positioning sealing ring 42 in a sleeved mode, the two adjacent metal pipelines are coaxially arranged with the positioning sealing rings 42, sealing is achieved between the two ends of each positioning sealing ring 42 and the two connecting flanges 41 through the sealing rings 43, and the connecting flanges 41 at the two ends of the adjacent metal pipelines are fixed through bolts.
Specifically, the ends of the pipeline at the joint of two adjacent metal pipelines protrude out of the connection plane of the connection flange 41, so as to form a state of backward installation of the flange. A positioning sealing ring 42 and two sealing rings 43 are used, the inner wall of the positioning sealing ring 42 is matched with the protruding part of the metal pipeline, so that the metal pipeline is concentric with the positioning sealing ring 42, the sealing rings 43 are clamped between the end face of the positioning sealing ring 42 and the connecting flange 41, and the connecting part between two adjacent metal pipelines achieves a better sealing state.
The positioning sealing ring 42 is provided with a positioning detection hole, a pitot tube 44 is assembled in the positioning detection hole, and the gas parameter measuring device 45 is communicated with the inside of the annular closed pipeline 21 through the pitot tube 44.
In order to meet the experiment requirement, other detection equipment or sensors can be installed under the condition that the special equipment joint is equipped in the positioning detection hole.
The fan blades of the fan 22 are adjustable in installation angle to meet different experimental requirements, specifically 60 ° in this embodiment.
The constant pressure storage tank is also provided with an exhaust valve, and after the experiment is finished, the pressure in the pressure regulating storage tank and the annular closed pipeline 21 can be discharged through the exhaust valve.
The utility model provides a pressure becomes windage and hinders survey experimental apparatus, adopts aforementioned a pressure becomes windage and hinders survey experimental apparatus, includes the following step:
step 1, adjusting the pressure in the annular closed pipeline 21 to a value required by an experiment by using a pressure changing device 3;
step 3, measuring the wind speed v of the experimental test section and the on-way resistance h at the two ends of the experimental test section by using the gas parameter measuring device 45fRecording experimental data, specifically, recording a group of data every minute (one group of data comprises 60 wind speed data and 60 on-way resistance data), and thus recording 6 groups of data;
specifically, in this embodiment, the experimental testing section at least includes two sections of metal pipes, and the on-way resistance h at the two ends of the experimental testing section is measured by the micro-pressure difference meters at the two ends of the experimental testing sectionfMeasuring the wind speed v of the experimental test section by a gas parameter measuring device 45 in the middle of the experimental test end;
step 5, repeating the steps 1 to 3 to obtain a plurality of groups of experimental data under different pressures;
step 6, processing experimental data, respectively adjusting the pressure in the annular closed pipeline 21 to 0.07Mpa, 0.08Mpa, 0.09Mpa, 0.11Mpa, 0.12Mpa and 0.13Mpa, calculating the friction resistance coefficient of the experimental test section under different pressure conditions, and finally obtaining the relation between the pressure and the friction resistance coefficient;
specifically, the experimental data in step 4 is processed by performing normal distribution processing to obtain multiple groups of optimal on-way resistances hfAnd the wind speed v, and then the maximum value and the minimum value are removed to obtain more accurate and objective experimental data.
Step 6.1, calculating the gas flow of the experimental test section by the following formula:
Q＝Sv
wherein Q is the unit time flow of gas in the experimental test section, m3/s；
S is the sectional area of the annular closed pipeline 21, m2；
v is the average velocity of the gas in the experimental test section, m/s;
step 6.2, calculating the friction wind resistance of the experimental test section according to the following formula:
R＝hf/Q2
wherein R represents the frictional wind resistance of the experimental test section, kg/m7；
hfRepresenting the on-way frictional resistance, Pa, of the experimental test section;
q is the flow rate of gas in the experimental test section per unit time m3/s；
Step 6.3, calculating the friction resistance coefficient of the experimental test section by the following formula:
α＝R·S3/L·U
wherein α represents the frictional resistance coefficient in kg/m of the experimental test section3；
R represents the frictional wind resistance of the experimental test section, kg/m7；
S is the sectional area of the annular closed pipeline 21, m2；
L represents the length of the experimental test segment, m;
u represents the perimeter, m, of the inner wall of the experimental test section;
and 6.4, repeating the steps 6.1 to 6.4 until the friction resistance coefficient of the test section of the experiment under all pressure conditions of the experiment is calculated, and establishing a fitting equation of the pressure and the friction resistance coefficient alpha to obtain the relation between the pressure and the friction resistance coefficient alpha.
The invention has the advantages that the specific relation between the atmospheric pressure P and the friction resistance coefficient alpha can be known through a fitting equation. On one hand, the problem that the friction resistance coefficient alpha of the mine is different due to different geographic positions is solved, and the repeated workload and labor intensity in the actual engineering can be reduced, so that the aim of saving manpower and material resources is fulfilled. Secondly, the friction resistance coefficient of the mine changes at any time due to the fact that the pressure in the atmosphere changes at any time, and the determination of the relation between the atmospheric pressure P and the friction resistance coefficient alpha is a huge premise for researching and establishing real-time calculation of a ventilation network.
The above examples are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above examples, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (8)
1. A pressure variable wind resistance determination experimental device is characterized by comprising an upper computer, a ventilation device and a pressure varying device, wherein the ventilation device comprises an annular closed pipeline and a fan arranged in the annular closed pipeline, a plurality of groups of gas parameter measuring devices are uniformly arranged along the annular closed pipeline, the pressure varying device is used for adjusting the air pressure in the annular closed pipeline, the pressure varying device comprises a pressure source, a constant pressure storage tank and a pressure adjusting storage tank, the pressure source, the constant pressure storage tank and the pressure adjusting storage tank are sequentially communicated, a pressure adjusting electromagnetic valve is arranged between the constant pressure storage tank and the pressure adjusting storage tank, the pressure adjusting storage tank is provided with a pressure release valve, a manual vent valve is arranged between the pressure adjusting storage tank and the annular closed pipeline, an air pressure sensor is arranged in the pressure adjusting storage tank, the gas parameter measuring devices, the air pressure sensor, the pressure adjusting, the rotating speed of the fan is controlled by the upper computer, the collected data are transmitted to the upper computer by the air pressure sensor, and the upper computer controls the opening or closing of the pressure regulating electromagnetic valve and the pressure relief valve according to the received air pressure data.
2. The pressure-variable wind resistance measurement experiment device according to claim 1, wherein the gas parameter measurement device comprises a multifunctional parameter tester and a micro differential pressure gauge.
3. The pressure-variable wind resistance measurement experiment device according to claim 2, wherein the annular closed pipeline is made of metal and is formed by connecting a plurality of sections of metal pipelines end to end, adjacent metal pipelines are connected through flange joints, each flange joint comprises a connecting flange, a positioning sealing ring and a sealing ring which are respectively arranged on the outer surfaces of the adjacent metal pipelines, the outer wall of each metal pipeline between the two connecting flanges is sleeved with the positioning sealing ring, the two adjacent metal pipelines and the positioning sealing rings are coaxially arranged, the two ends of each positioning sealing ring and the two connecting flanges are sealed through the sealing rings, and the connecting flanges at the two ends of the adjacent metal pipelines are fixed through bolts.
4. The pressure-variable wind resistance measurement experiment device according to claim 3, wherein the positioning sealing ring is provided with a positioning detection hole, a pitot tube is assembled in the positioning detection hole, and the gas parameter measurement device is communicated with the inside of the annular closed pipeline through the pitot tube.
5. The pressure-variable wind resistance measurement experiment device according to claim 4, wherein the installation angle of the fan blades of the fan is 30 degrees, 45 degrees or 60 degrees.
6. The pressure-variable wind resistance measurement experiment device according to claim 5, wherein the installation angle of the fan blades of the fan is 60 degrees.
7. The pressure-variable wind resistance measurement experiment device according to claim 6, wherein the constant-pressure storage tank is further provided with an exhaust valve.
8. A pressure-variable wind resistance measurement experiment method adopts the pressure-variable wind resistance measurement experiment device as claimed in any one of claims 1 to 7, and is characterized by comprising the following steps:
step 1, adjusting the pressure in the annular closed pipeline to a value required by an experiment by using a pressure changing device;
step 2, starting the fan, adjusting the fan to the rotating speed required by the experiment by using an upper computer, selecting a section with relatively stable wind flow as an experiment testing section after the dynamic balance in the annular sealed pipeline is achieved, and setting the refreshing time interval of the gas parameter measuring device to be 1S;
step 3, measuring the wind speed v of the experimental test section and the on-way resistance h at two ends of the experimental test section by using the gas parameter measuring devicefAnd recording experimental data;
step 4, repeating the step 2 and the step 3 to obtain a plurality of groups of experimental data under different fan rotating speeds;
step 5, repeating the steps 1 to 3 to obtain a plurality of groups of experimental data under different pressures;
step 6, processing the experimental data, calculating the friction resistance coefficient of the experimental test section under different pressure conditions, and finally obtaining the relation between the pressure and the friction resistance coefficient;
step 6.1, calculating the gas flow of the experimental test section by the following formula:
Q＝Sv
wherein Q is the unit time flow of gas in the experimental test section, m3/s；
S is the sectional area of the annular closed pipeline, m2；
v is the average velocity of the gas in the experimental test section, m/s;
step 6.2, calculating the friction wind resistance of the experimental test section according to the following formula:
R＝hf/Q2
wherein R represents the frictional wind resistance of the experimental test section, kg/m7；
hfRepresenting the on-way frictional resistance, Pa, of the experimental test section;
q is the flow rate of gas in the experimental test section per unit time m3/s；
Step 6.3, calculating the friction resistance coefficient of the experimental test section by the following formula:
α＝R·S3/L·U
wherein α represents the frictional resistance coefficient in kg/m of the experimental test section3；
R represents the frictional wind resistance of the experimental test section, kg/m7；
S is the sectional area of the annular closed pipeline, m2；
L represents the length of the experimental test segment, m;
u represents the perimeter, m, of the inner wall of the experimental test section;
and 6.4, repeating the steps 6.1 to 6.4 until the friction resistance coefficient of the test section of the experiment under all pressure conditions of the experiment is calculated, and establishing a fitting equation of the pressure and the friction resistance coefficient alpha to obtain the relation between the pressure and the friction resistance coefficient alpha.
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| JP3027724B2 (en) * | 1997-03-13 | 2000-04-04 | 戸田建設株式会社 | Wind pressure measuring device for wind resistant building design |
| CN102636328B (en) * | 2012-04-11 | 2015-02-04 | 中铁西南科学研究院有限公司 | Simulation test method of ventilation on-way frictional resistance coefficient of curved tunnel |
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| CN106593507A (en) * | 2016-11-26 | 2017-04-26 | 辽宁工程技术大学 | Ventilation resistance testing method |
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