Concept model of the domestically produced Jueying 8 high-speed helicopter. Note that it uses counter-rotating propellers.
According to the official account of the Aviation Industry Helicopter Research Institute, the new model helicopter of the Helicopter Research Institute has successfully made its first flight in 2019. This type of helicopter breaks the conventional configuration restrictions and effectively improves its performance. It is the basic model of the new generation of domestic helicopters.
Outsiders believe that this type of helicopter should be a new generation of high-speed domestically produced helicopters. It adopts a new configuration and technology, and its overall performance is qualitatively improved compared to existing helicopters. The successful first flight of this helicopter marks that domestic high-speed helicopters have passed the preliminary technical research stage and entered the engineering development period.
Existing helicopters are limited by their configuration, and the maximum speed is difficult to exceed 400 kilometers per hour
Existing helicopters use rotors to increase lift and increase vertical lift, and then tilt the propeller disk forward to pull the helicopter forward. In this way, not all the power of the helicopter engine is used to move forward. There is only one forward component pulling the helicopter forward, and the propeller disc and fuselage will also increase resistance and reduce the speed of the helicopter. In addition, when the helicopter rotor rotates at high speed, a "reverse flow area" will occur. Because the rotor speed of is very high, in most areas, the speed of the blade cutting air will be greater than the speed of the forward flying airflow. In the blade root part, the blade The linear speed of the cutting air is small, and the speed of the forward flying airflow is greater than the speed of the blade cutting air. The total combined airflow will be blown from the trailing edge of the blade to the front edge, causing "airflow separation". This will further reduce the forward speed of the helicopter. According to relevant information, there is an upper limit on the speed of existing helicopters, that is, the level flight speed is difficult to exceed 400 kilometers per hour.
Imagination of the new generation of high-speed helicopters of the US military. Its speed is required to exceed 500 kilometers per hour
Modern warfare is changing rapidly, and the speed of helicopters has not been significantly improved since its inception. Nowadays, military and civilian users in various countries and regions are no longer satisfied with the vertical take-off and landing performance of helicopters, and require it to fly at higher speeds to adapt to the battlefield requirements of the new century. For example, the US military requires that the new generation of rotorcraft should not only maintain the vertical takeoff and landing performance of existing helicopters, but also increase the maximum speed. The maximum flight speed must be at least more than 500 kilometers. This indicator is almost the same as that of a turboprop transport aircraft.
U.S. military’s new generation high-speed helicopter development roadmap
Airbus X3 high-speed helicopter technology verification aircraft
As mentioned earlier, helicopters are limited by principles and the existing configuration cannot meet such requirements. Only innovative design can develop an aircraft that meets the requirements. Therefore, High-speed helicopters in the new century are a hot spot for the development of the aviation industry in various countries and regions. Judging from the development of similar foreign aircraft, composite propulsion systems are generally used to meet this requirement. For example, the American SB-1 high-speed helicopter technology demonstrator uses two rigid coaxial twin rotors to increase lift, and a propeller is installed at the tail to provide forward power for the helicopter. These two power sources perform their own duties to optimize performance. The Airbus X3 high-speed helicopter demonstrator adds short wings to both sides of the helicopter, equipped with drive propellers, which provide pulling force during level flight to reduce the load on the rotor and increase the speed of the helicopter. Through configuration upgrades, the maximum speed of both helicopters exceeds 500 kilometers, which is a qualitative improvement over existing helicopters, and the overall performance is significantly enhanced.
The Aviation Industry Helicopter Research Institute and other units have also carried out research on domestic high-speed helicopters based on development trends. In 2014, the domestically produced Jueying 8 high-speed helicopter concept model made its debut at the second Tianjin Helicopter Expo. Judging from the relevant model, its technical route is equivalent to or similar to the new generation of high-speed helicopters in the United States. It uses a composite propulsion system and the body is in the shape of a shuttle. , low resistance, the rotors are rigid double rotors, forward swept blades, used for vertical take-off and landing. In terms of propulsion propeller , there is a clear difference between the Jueying 8 and the new generation of high-speed helicopters in the United States. The latter directly uses propellers for propulsion. This is relatively simple, but the propellers are prone to stalling and will also produce torque on the fuselage, weakening the performance of high-speed helicopters.The Jueying 8 high-speed helicopter uses a counter-rotating propeller. There is a counter-rotating propeller behind the propeller. It can not only reduce the burden on the propeller, but also offset the torque generated by the latter, further enhancing the performance of the high-speed helicopter.
The Jueying 8 model is undergoing test flight
Considering the technical difficulty, it is speculated that the domestic high-speed helicopter that will fly for the first time in 2019 may be a technical demonstrator to verify the technical research results of domestic high-speed helicopters. Regarding the overall layout, aerodynamic design, and Technical verification of internal structure, etc. If the test flight goes well, the new generation of domestic high-speed helicopters will be designed based on this configuration and develop different models to replace the existing straight-10 armed helicopter and straight-20 tactical general helicopter . I believe that in the near future, we You may see domestic high-speed helicopters soaring in the blue sky.
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