The propeller is a rotary propeller that can generate thrust through turbine propeller engines.Or tension.Unlike the propellers on the fixed wing aircraft, only the thrust or tension is generated. Some small drones and helicopters use rotation mainly to generate lift.What are the differences in the fields of propellers and rotor?
(Picture source "Knowledge is Power" magazine)
The size of the paddle leaves is very different.
The propeller and rotor are important power components on the aircraft. The propeller is mainly used for large drones and the large drone andSome fixed -wing aircraft, rotations are mostly used for helicopters and small drones.In appearance and size, the propeller and the rotor are significantly different.Due to the fast flight speed of the fixed wing aircraft, the rotation speed at the tip of the propeller is very high, and the larger the leaf size of the propeller, the higher the rotation speed, which makes the speed at the tip of the paddle easily break through the sound speed.Once the speed of the rotation speed at the paddle tip, the rotation resistance of the propeller will greatly increase and produce strong noise.Therefore, the size of the propellers of the fixed -wing aircraft often does not do too long.Unlike the propeller, the rotor is relatively long in order to improve the lift.
Rotor helicopter (the source of "Knowledge is Power" magazine)
fixed wing aircraftThe propeller cannot be done too long, and its diameter (refers to the diameter of the round diameter formed by the rotation of the paddle, and the diameter of the paddle is exactly the distance between the two paddle tips).The rotor size is much larger.The diameter of the light helicopter has a diameter of several meters, the medium helicopter can reach more than ten meters, and the larger helicopter rotor diameter is even more than 30 meters.In addition to the differences in size, due to different working principles and application scenarios, the shape of the propeller and the rotor also has a large difference.The blades of the propeller are usually shorter and the leaves are wide. The helicopter rotor is more complicated than the propeller, and the width of the leaves is limited. Therefore, the lift can only be increased by increasing the length. The leaves are long.
Fixed winged propeller aircraft (the source of "knowledge is the power" magazine)
Differences on the wing type
When the propeller rotates, the blade can obtain the reaction force by pushing the air, which can output the engine output of the engine output.Converted into the thrust or tension of the aircraft.The cross section of the helicopter rotor is similar to the wing section of the fixed -wing aircraft. When the rotation, the upper and lower sides of the wing surface will generate the pressure difference between the upper and lower sides of the wings, providing a lift for the helicopter.
The propeller blades of fixed-wing aircraft have high hardness, mainly overcoming the forward resistance (the source of the "knowledge is the power" magazine)
As a component of the thrust or tension of the aircraft, the cross section of the general propeller uses a wing -like wing type.In the process of rotation of paddle leaves, according to Berunleys theorem, the air flow rate in front of the paddle leaves is large, and the pressure is smaller than the rear of the paddle. The pressure difference can be provided to the aircraft.Since the birth of the aircraft, the wing type of the wing has continued to replace, and the wing type that can be suitable for propellers has also increased.
Generally speaking, most of the fixed -wing aircraft propellers will not use the same low -speed wing type from the paddle to the paddle to the paddle roots, but at the speedThe higher position of the high paddle tip is selected from a thin high -speed wing type, and a thicker low -speed wing type is adopted at the roots of the paddle to reduce the burden on the engine and increase the speed.If the paddle roots are consistent with the wing type at the paddle tip, it is likely to increase the resistance when the propeller rotates and reduce the speed.
The rotor blades of the helicopter are slender and flexible structure, which mainly overcome the pressure difference
(Picture source "Knowledge is Power" magazine)
Why cant the rotor rotor of the helicopter be called a propeller
P ID = "35KSCK3F"> Port aircraft to drive the propeller through the engine to drive the propeller, and the propeller rotation is used to generate thrust to promote the aircraft movement.The helicopter mainly lifts off through the lift generated by the rotor, and adjusts the propeller distance of the tail propeller to resist the reaction force generated by different speed generated by the rotor, thereby pushing the body to move towards different directions in different directions.One is used to generate thrust, one is used to generate upward lift, and the working principle is completely different, so the rotor of the helicopter cannot be called a propeller.The propeller leaves of fixed-wing aircraft are not flat, and have a certain to reversing angle (the source of "knowledge is the power" magazine)
What is the number of paddles of the propeller?
The propeller usually installed on the head of the aircraft is a pull -type propeller, and the propeller installed on the rear of the aircraft is a thrust -type propeller.In addition, some fixed -wing aircraft are installed.If you want to increase the thrust or tension of the propeller, it is one of the methods to increase the number of paddles on the propeller.The number of paddles on a propeller on a aircraft is based on the power of the engine. Small aircraft usually use the propeller of two blades; large aircraft use multiple engines, each equipped with more than 3 clams of the blades.
Small planes often use two blades to propelle (the source of the "knowledge is the power" magazine)
Although the propeller and rotor are both rotating power sources, due to the complex loading situation such as twisting, variable distance, waving, and vibration, the rotor is more difficult than the propeller.
Writing | Yi Man
Responsible editor | Li Yinhui Zhang Lihan
Operation Editor | Zhang Lihan
Quality Audit | Industry Lei
❖ Source: "Knowledge is Power" magazine
""Similar Simulture" of the Rotor and Prophopper
Order 2024
Price of 360 yuan
