What are the applications of an anemometer?

『Airflow velocity meter』Related information(flow rotameter|digital flow meter|balo meter|hydraulic flow meter|volumetric meter|positive displacement meter|pitot tube flow meter|displacement meter|cfm meter|variable area flow meter|inline flow meter|differential pressure flow meter|calibrated flow meter|velocity meter|paddle wheel flow meter|oval gear flow meter|anemometer hvac|multiphase flow meter|doppler flow meter|thorpe tube flowmeter|heat flow meter)

Why can we know the flight speed of an airplane through an airspeed indicator? 】Is the aircraft speed airspeed or ground speed We all have the experience that when you sit in a convertible car, as soon as the car is driven, you will feel the continuous airflow rushing towards you. The faster the car is driven, the greater the pressure of the airflow, that is, the greater the sense of pressure. The same goes for flying, where the airflow flows from the front of the nose towards the plane, and the faster the plane, the faster the airflow. In fact, measuring airflow velocity is measuring the speed of an aircraft. How to measure airflow velocity? Usually, measurements are made using an "airflow velocity meter" instrument. The principle is as follows: one is the total pressure tube, and the other is the static pressure tube. These two tubes are connected to both ends of a U-shaped glass tube (containing mercury), with the total pressure tube opening forward and the static pressure tube opening upward. Put this together in the airflow, with the total pressure tube opening facing the direction of the airflow, to measure the dynamic pressure of the airflow and determine its velocity. What is dynamic pressure? Why can we know the velocity of airflow just by knowing the dynamic pressure? To clarify this issue, we need to start with static pressure strength. The airflow flows along the outer surface of the speedometer without interference, so its pressure is equal to the static pressure in the still air, which acts on the mercury in the static pressure tube. However, the airflow entering the opening of the total pressure pipe is in a different situation, where the movement of the airflow is obstructed and the speed becomes zero. The speed disappears, and the corresponding airflow transforms into dynamic pressure. This dynamic pressure exists in the gas inside the total pressure pipe. So, the pressure of the gas in the total pressure pipe consists of two parts, one is the dynamic pressure and the other is the static pressure (which the gas flow originally had). The total pressure is the sum of dynamic pressure and static pressure. The difference in height between the mercury surfaces on both sides of the U-shaped tube is the magnitude of the dynamic pressure. The airspeed indicator on an airplane uses the above principle to measure flight speed by measuring the dynamic pressure of the airflow. An instrument placed in an airflow to sense the pressure of the airflow is called a "airspeed tube". The airspeed tube is installed in front of the nose or at one end of the wing. In order to accurately feel the pressure of the jet, the axis of the airspeed tube must be parallel to the longitudinal axis of the aircraft. The static pressure and total pressure experienced by the airspeed tube are sent out through the conduit. All instruments or equipment that require static and dynamic pressure in the cockpit of an aircraft are connected to conduits and airspeed tubes. Due to the limitations of the cabin environment and the instability of mercury in the U-tube during flight, it is impossible to install U-tubes on the aircraft to measure aerodynamic pressure. The instruments used for measuring dynamic pressure are similar to the elastic membrane box used in the altimeter. However, this elastic membrane box is not closed, it has an opening that allows the total pressure to pass into the membrane box, and the static pressure acts on the outer surface of the me

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