The word "all the way to the wind" is the most accustomed sentence for everyone to say goodbye, to express wishes, but when it comes to the airport, people who are slightly knowledgeable will never say the words "all the way to the wind", why can't you say a smooth wind when you send people to the airport?
I once read a chicken soup: "It doesn't matter if you think everything is against you, because the plane takes off in a headwind." "It's chicken soup, but there's one thing that's true: the plane did take off against the wind.
Knock on the blackboard ~ knowledge points are coming~
Wind is a common natural phenomenon, and aircraft often take off and land in windy conditions. But all the planes take off and land, and they are most afraid of the downwind. For aircraft flight safety, the most dangerous time is the take-off and landing of the aircraft. The speed of the aircraft during take-off and landing is relatively slow, the stability is poor, if it encounters strong crosswinds or unstable downwinds, the aircraft is likely to be blown and tilted, difficult to control. Because the wind affects the attitude angle, flight speed and taxi distance of the aircraft, and is related to the safety of passengers, when the wind speed and direction are not conducive to flight, the voyage will be canceled.
Just like flying a kite, when we first start flying a kite, we always have to pull the kite to run against the wind for a distance, the purpose is to increase the speed of the kite relative to the air, so that it gets more lift and rises faster. Similarly, when the plane takes off. If the wind blows head-on, at the same speed, it will gain more lift than when there is no wind or downwind, so it can take off from the ground faster. When landing in the windward, you can use the resistance of the wind to reduce the speed of some aircraft, so that the aircraft can slide down a little after landing.
Therefore, the selection of headwind environment take-off and landing, so that the aircraft can obtain better lift or resistance, easy to control, generally smooth and safe aircraft take-off and landing are carried out in the headwind state.
In order to avoid this danger, all airport runway directions should be selected according to the main local wind direction, one is to shorten the taxiing distance of the aircraft to take off or land, and the other is relatively safe.
In the airport observation of all meteorological elements, the ground wind speed and wind direction data for the aircraft take-off, landing has a greater impact, the aircraft in the airport take-off or landing, the ground wind speed and wind direction not only affect the smoothness of the aircraft operation, but also affect the length of the aircraft on the runway sliding distance, which is directly related to the safety of the entire flight activity. In this regard, ensuring the operational safety of ground aircraft at the airport by monitoring the wind speed and wind direction in real time is the top priority in the airport meteorological monitoring.
In the past when science and technology were not developed, monitoring wind speed and wind direction was still using wind direction bags to estimate wind speed, and the measurement accuracy of this method was poor, the degree of automation was low, and the actual use was inconvenient. Compared to the wind direction band. At present, mechanical wind speed and wind direction sensors are more intelligent.
Wind speed and wind direction sensors at home and abroad can be divided into three categories:
One is a propeller-type wind direction wind speed sensor. Propeller-type wind sensors have poor accuracy and average dynamic performance.
The second is that the wind speed is three cup type, and the wind direction is a single-wing wind speed and wind direction sensor. Three-cup sensor operation is more applicable, most of the wind speed and wind direction sensor through the sensor for measurement, the induction element of the wind speed sensor is a three-cup rotary frame, the signal conversion circuit is a Hall switch circuit. Under the action of horizontal wind, the wind cup group rotates, driving the magnetic bar disc through the main sleeve.
The third is the ultrasonic wind speed and wind direction sensor. Ultrasonic wind speed and wind direction sensor mainly use ultrasonic time difference method to achieve wind speed and wind direction measurement, but at present, the application of ultrasonic wind speed wind direction sensor is not very mature.
Low-altitude monitoring of airport wind direction and wind speed can be simply recorded using wind speed and wind direction sensors, but for the monitoring of wind direction and wind speed at high altitude, another option is made.
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