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In order to reduce the impact of aircraft exhaust on the atmosphere, Dutch aviation engineers are currently exploring the design of a new generation of green aircraft. The new generation of aircraft will resemble flying saucers and largely subvert the traditional flight engineering design concept.
Future aircraft shaped like UFO
Ethel Strasma of Delft University of Technology in the Netherlands said: "I want to get rid of the aircraft's consistent design concept, such as a cylindrical body with wings. In my imagination, the future of the plane may be It will be a flying saucer.†She and some engineers are planning to use some lighter materials, while other engineers are considering re-enabling propeller aircraft as eco-friendly passenger aircraft. Recently, Strasma spearheaded the establishment of a project called "CleanEra" designed to design a "super eco-friendly aircraft" that emits less CO2 per passenger-mile than current passenger aircraft. 50%. The "green airplane" depicted in the design map resembles a flying saucer, which can reduce various pollutants and noise, and meets the European Aeronautical Research Advisory Committee recommendation.
One design concept is to reactivate the propeller aircraft. Even if the propeller blades are driven by a "jet" (gas turbine) engine, this type of aircraft is also more fuel efficient than a jet aircraft. However, the problem is that the propeller plane is very slow to fly, and it is even slightly unacceptable. Strasma said: “One of my requirements is to increase comfort, but once the voyage becomes longer we can hardly do this.†However, scientists are still trying to improve the design of propeller aircraft, such as the use of special songs. The degree of thin blade to achieve the current aircraft Mach 0.8 (about 530 mph) speed. The problem with this design is that the blades rotate so fast that the shock waves generated at the tips of the blades are very strong. Strasma said her research team will look for ways to reduce noise, such as propellers with two blades rotating in opposite directions.
Using new composite materials
Another idea is to use composite materials such as fiber-reinforced plastics. The strength of this composite is comparable to that of metal, but its weight is much lighter than metal, thus saving fuel. In Boeing's latest debut on the Boeing 787 Dreamliner, reinforced plastic composites accounted for 50% of the weight. The British low-cost airline EasyJet recently demonstrated a short-range aircraft design model that can reduce carbon dioxide emissions by 50% and will be operational by 2015.
However, Alexander Han believes that simply replacing composites with aluminum nowadays, to truly make full use of new materials, engineers must "think well about the use of composites." He said that when designing the fuselage of an aircraft, if all fiber-reinforced plastics are used instead of splicing the metal sheets, the weight can be reduced by 30%. In addition to making the aircraft lighter, composites can give engineers more freedom in the design of the aircraft's profile, helping to make full use of aerodynamics. Strasma believes that the design and manufacture of a fully composite aircraft is still unrealistic because the heat resistance of composites is not as good as that of metals, and some of them are prone to moisture, which is a big problem for wings.
Significantly reduce tail gas pollution
Professor Tom Burundell, professor of biology at Delft University of Technology in the Netherlands, said: “If the international community does not control the current rapid growth of air traffic, aircraft emissions are likely to be one of the main factors of global warming.†Tom • Brundell said that emissions of harmful substances such as carbon dioxide, nitrogen, sulfur oxides, hydrocarbons and other fine particles from aircraft engines, which are emitted into the atmosphere, will certainly have adverse effects on the climate. By 2050, aviation will account for 6-10% of the climate change. The status quo of air freight is even more worrying. In the coming decades, the demand for air cargo will most likely continue to increase. Tom Burundell believes that if new types of environmentally friendly aircraft can be promoted as soon as possible, the impact of aircraft emissions on atmospheric pollution will be greatly reduced.
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