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侧风方法(Cross wind method)
侧风方法(Cross wind method)
Measure wind temperature, gas and carbon dioxide concentration.
2. Measure the section of roadway with tape measure, and select the calculation method according to the section shape (rectangle and semicircle arch) of the roadway.
3. Select the appropriate wind table according to the wind speed of the location.
4, take out the table and a stopwatch, table pointer and a stopwatch to wind back to zero, and then make the table against the wind, the wind and vertical wind direction, wind table idling for 30 seconds after switch on the wind table and a stopwatch at the same time, began to determine.
5. Choose the wind watch movement route: one of the methods of folding line method (six-wire method), four-wire method, circuitous eight-line method, 12-point method, standard line method and so on.
In the course of measuring the wind, the wind watch moves smoothly and steadily, and does not allow the measurement process to ensure that the movement speed of the wind watch is changed in the first minute. When the wind watch is moving, the wind gauge should adopt a lateral approach to hold the position of the wind.
7. At the same time, turn off the wind meter, stopwatch switch, and read the meter speed at the same time. The wind shall not be less than 3 times in the same section, and the error shall not exceed 5%.
8. Calculate the actual wind speed of the roadway according to the formula of the wind meter calibration curve.
The actual wind speed of the lane which is measured. The actual air volume is calculated
Mechanical vane anemometer
1.1 structure principle
The instrument is mainly composed of wing wheel, worm wheel, worm wheel shaft, counter, indicator needle, back zero brake lever, clutch brake, shell, lifting ring, base and so on. The wing wheel is composed of eight blades which are installed in a certain Angle according to the vertical plane of the rotation axis. The wing wheel rests on the wing axle, which turns in the eyes of the two corundum a
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