In Russia, a model of a flat jet nozzle for promising supersonic civilian aircraft has been registered. The development is designed to reduce noise and maintain thrust and economic characteristics during takeoff and landing.
The nozzle has a rectangular critical section and consists of subsonic and supersonic parts. The supersonic part is elongated by 6-8 calibers and equipped with an adjustable flap that deflects downward at an angle of up to 20°. The nozzle is installed with a gap in a U-shaped niche in the rear of the fuselage, formed by the keels of the vertical tail and the shielding surface.
This scheme shields the jet and reduces the acoustic impact on the area during takeoff and landing modes. At the same time, the gap improves the flow around the rear of the fuselage and reduces thrust loss.
Calculations show that thrust losses are 1.5-2.5% of ideal thrust, which corresponds to the level of round axisymmetric nozzles.
At the same time, the design contains only one moving element - an adjustable flap, which reduces weight and complexity compared to noise reduction systems with several rows of flaps.
As a reminder, a flat nozzle in Russia has already been proposed for usein the new second-stage AL-51F1 engine for the Su-57 fighter. But there, this configuration is designed to reduce the radar and thermal signature of the aircraft in the rear hemisphere.
Read more materials on the topic:
Now on home
The platform allows you to send short videos to random people and watch other people's video messages
Likhachev spoke at the AtomSkills championship in Yekaterinburg
The General Designer of NPO Mashinostroyeniya was 74 years old
New friction stir welding technology creates strong bimetallic joints without delamination
Patented technology simplifies the production of lightweight and rigid thin-walled structures
The electromechanical device spins dozens of metal and fiberglass cables, creating a protective zone
New circuit opens the way for reliable electronics in extreme conditions
The Ministry of Health is preparing to launch a system that will store data on vaccinations, contraindications, and refusals
Joint venture established for exploration and processing of raw materials for high-tech industry
The restyled SUV received a turbo diesel, LED optics, and a new multimedia system
The device will allow conducting research at the nanometer level
The enterprise will be launched at the end of 2028, with a design capacity of 10.5 thousand extra-large tires per year