Future 2-story aircraft is designed to eliminate sound explosions

One of the 20th century aviation science studies may be the answer to the sound-blasting elimination, according to researchers at MIT and Stanford University.Considering that two-tier aircraft is still in use today, the designs of these designers include the second wing with the effect of preventing drag created by obstacles when approaching or overcoming. sound speed.

>>>Waving your hand to control the plane

In fact, this is not a new idea. The idea for a two-tier aircraft that could prevent sound explosions has been mentioned since the 1930s by one of the pioneers of aviation technology - Adolf Busmenann, who also came up with the idea for wing aircraft. to scan.

The plane moves at the speed of sound creating resistance in the air that surrounds it. The first explosion was caused by the sudden increase in compressive force at the tip of the plane mainly due to the gravity of the aircraft. The second explosion was caused by the remaining forces when the aircraft officially took off - a change in the sudden pressure to normal levels soon after. Although these two explosions have completely different meanings, because it happens so close, it is often mistaken for one. Aircraft moving at speed of sound often continue to make sound bursts as they move.

The problem lies there. Sound may be normal, but if you endure the sounds made by flights at this speed of sound often it will be uncomfortable. In addition, there is concern about the impact of supersonic flights on wildlife such as leaving short-term sequelae and affecting ecosystems over time. And this is not surprising when commercializing supersonic flights is a dead end, in some ways.

The design of Adolf Busemann, known as the Busemann 2-deck aircraft with two long triangular wings intertwined. The direction of the pointing at each other makes the side surface in the opposite direction with the blowing wind or the impact from the bottom up. These wings must be at a reasonable distance so that the flow of wind between the wings is not blocked. With this design, the first drag created will be reflected between the wings, creating space when the aircraft takes off, disabling the jet as well as eliminating the sound. But where is the problem? At the semi-ultrasonic velocity, the 2-stage Busemann aircraft did not have the necessary lift when it was accelerating and was also subjected to a considerable force. This design works perfectly at supersonic speeds - the hard part is how to achieve that speed. So even though there is no sound explosion, this flight is hard to come true.

MIT and Stanford's research collaboration came to the conclusion that Busemann's design was soundproof. According to research using computer calculations, a two-tier model of flight simulation shows 'much less traction'. As Japan's extensive research at Tohoku University, Busemann's design can reduce drag when ground level reaches 85%. Moreover, it seems that the MIT / Stanford team has found a solution to the problem of lifting force at the semi-ultrasonic velocity. After the process is repeated many times, with different customizations in the design, the team discovered that smoothing the inside surface of the wing will make it easier for the air in the middle of the wing to circulate. By adding an 'opened' part to the exterior of the two wings, this team ensured the creation of a design that could fly below the sound velocity with a half-drag Concorde.

Qiqi Wang, MIT's assistant professor of aeronautics and cosmology, said: 'If you study carefully about take-off, the only thing that an airplane must load will not only have passengers but also fuel. If you reduce fuel consumption, the amount of fuel to carry will be significantly reduced, leading to a reduction in the size of the design to store fuel. It can be considered a chain reaction '. The MIT / Stanford research team is currently creating a 3D model that identifies the real factors that occur in flight in the hope of getting closer to a unified and optimal design. In the contract, the Japanese design surveyed by Wang will change the shape of the aircraft in flight to help achieve supersonic speed.