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Quiet aircraft landing gear

30.09.2020

The French company Safran, together with the American aircraft manufacturer Boeing, has tested a "quiet" landing gear, which creates less aerodynamic noise than the conventional landing gear of modern aircraft. The tests were carried out on an Etihad Airways Boeing 787-10 and were considered successful.

International aviation authorities periodically update the requirements for aircraft in terms of noise level. In order to reduce the noise of aircraft, and hence airports, developers around the world are creating new technologies that would make aircraft quieter.

Quiet landing gear tests were carried out at Glasgow Airport in Montana, USA. To carry out the tests, Safran equipped the main landing gear and nose landing gear with pads designed to reduce the occurrence of turbulent flows.

The devices tested are linings on the landing gear and flap edges. On the landing gear legs, such pads close the gaps between the structural elements and improve the air flow around. The pads on the bottom of the flaps are made in such a way as to reduce the likelihood of turbulent flow.

The lining on the edges of the flaps in the upper part have vortex generators. They disrupt the laminar flow of air and prevent the formation of a slow flow boundary layer. In addition, the lining on the flaps slightly reduce the gap between the ends of these elements and the wing.

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Aviation fuel from soybean oil 04.12.2021

Biofuel blends are one way the aviation industry is reducing its carbon footprint, or overall greenhouse gas emissions, especially carbon dioxide. Scientists at the Agricultural Research Service (ARS) in Peoria, Illinois have figured out how to make quality jet fuel from soybean oil.

The fatty acids found in soybean oil can be converted into a range of industrial products typically derived from petroleum, such as fuels, inks or paints. One of the benefits of plant foods is that they recycle atmospheric carbon. This makes plants a renewable resource, unlike oil or other fossil fuels, which, on the contrary, add carbon to the atmosphere.

However, the current soy jet fuel contains an insufficient amount of "aromatic" compounds, which give it the necessary density, elasticity and proper operation of engine seals. Because of this, it can be less blended with conventional petroleum-derived jet fuel, explained Ken Doll, a research chemist at the National Center for Agricultural Use Research.

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In laboratory experiments, this approach has resulted in soybean oil containing 8 to 35 percent aromatic hydrocarbons, a range compatible with conventional jet fuel.

The new discovery makes possible a much wider use of blends of biofuels and conventional jet fuel to reduce emissions. It also produces far less naphthalene, a component of jet fuel that releases soot when burned. The researchers are now looking for an industry partner to expand the project and further evaluate its commercial potential. Ideally, the valuable rare earth element iridium could be replaced by a cheaper catalyst, perhaps even iron.

Soybean oil was originally chosen for its high quality and availability, but any oil with a high oleic acid content, such as watercress, will work.

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