How to measure airflow with an anemometer?
1. Measurement of anemometer in pipeline
Practice has proved that the 16mm probe of the anemometer is widely used. Its size not only guarantees good permeability, but also can withstand flow rates as high as 60m/s. As one of the feasible measurement methods, the air flow velocity measurement in the pipeline, the direct measurement procedure (grid measurement method) is practical for air measurement.
Second, the measurement of the anemometer in the extraction and exhaust
The vent will greatly change the relatively balanced distribution of the airflow in the duct: a high-speed zone is formed on the outer surface of the free vent, and a low-speed zone is formed in other parts, and a vortex is formed on the grid. According to the different design methods of the grid, the airflow section is relatively stable at a certain distance (about 500px) in front of the grid. In this case, the aperture wheel of the large anemometer is usually used for measurement. Due to the larger caliber, it is possible to uniform the unbalanced flow rate and calculate its average value in a larger range.
3. The anemometer uses a volumetric flow funnel to measure at the suction hole
Even if there is no pre-disturbance of the grille at the suction point, the path of air flow 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 close to the pumping, there is no position that meets the measurement conditions and can be used for measurement operations. For example, the grid measurement method with the average value calculation function is used for measurement, and the volume flow method is used to determine the volume flow method, and the volume flow method is used to determine the volume flow, etc., as long as the pipe or funnel measurement method can provide repeatable measurement results. In this case, measuring funnels of different sizes can meet the application requirements. The application of the measuring funnel can generate a fixed section that meets the flow velocity measurement conditions at a certain interval in front of the sheet valve, measure and locate the center of the section and fix the section, measure and locate the center of the section and fix the section, measure and locate the center of the section and fix here. The measured value obtained by the flow probe is multiplied by the funnel factor to calculate the volumetric flow drawn.
