Measurement-related content about anemometers
1. Airflow Velocity Measurement in Ducts Practice has proved that the 16mm probe of the anemometer is the most versatile.
Its size not only ensures good permeability, but also can withstand a flow velocity up to 60m/s. As one of the feasible measurement methods, the airflow velocity measurement in the pipeline is suitable for air measurement by the indirect measurement procedure (grid measurement method).
2. The measuring vent in the exhaust will greatly change the relatively balanced distribution of the airflow in the pipeline: a high-speed area will be generated on the surface of the free vent, and the rest will be a low-speed area, and vortices will be generated on the grid. According to the different design methods of the grid, at a certain distance (about 20cm) in front of the grid, the airflow section is relatively stable. In this case, a large-bore anemometer is usually used for measurements. This is because the larger bore is able to average the unbalanced flow rate and calculate its average value over a larger range.
3. In the measurement of the suction hole, even if there is no grid interference at the suction point, the air flow route has no direction, and its airflow section is extremely uneven. The reason is that the partial vacuum in the pipeline draws the air into the air chamber in a funnel shape. Even in the area very close to the pumping, there is no position that meets the measurement conditions and can be used for measurement operations. If the grid measurement method with average calculation function is used to measure, and to determine the volume flow method, and to determine the volume flow method, only the pipe or funnel measurement method can provide repeatable measurement results. In this case, measuring funnels of different sizes can meet the requirements of use. Using the measuring funnel, a fixed section that meets the flow velocity measurement conditions can be generated at a certain distance in front of the sheet valve, and the center of the section is measured and fixed. here. The measured value obtained by the flow rate probe is multiplied by the funnel coefficient to calculate the drawn volume flow. (eg funnel factor 20)
