down-draught的意思|示意

Down-draught is a term used in meteorology and aviation. In meteorology, down-draught is a term used to describe a downward current of air. In aviation, down-draught is a term used to refer to an aircraft descending, usually at an angle of more than 3 degrees.

In meteorology, down-draught is a type of atmospheric current which is created when air or wind flows downwards due to changes in pressure. This is usually caused by the air molecules gaining additional energy in the form of heat, and then rising up, creating a downward current of air as their air pressure is lower than the surrounding air. This is known as turbulent air, and it can cause dangerous conditions for flying, such as downdraft, vertical wind shear, and turbulence.

In aviation, down-draught is the act of an aircraft descending at an angle of greater than 3 degrees. This is usually done to gain speed when entering a dive or to slow down and gain control when flying directly into a gust of wind. During this descent, the aircraft will reduce its height and speed, while also increasing its pitch, angle of attack and airspeed.

Down-draught can also be used to refer to the direction in which a pilot is flying. If they are flying in a downward direction, this is referred to as a down-draught flight. This is usually done when a pilot is trying to avoid turbulence or other hazards, or to reach a lower altitude.

Down-draught is an important term for pilots to understand, as it is often used to describe the direction in which an aircraft is flying and the type of descent it is performing. With proper understanding and application, down-draught can help pilots navigate safely through turbulent air.