![]() Turbulent air, on the other hand, does not just mean faster air. Laminar means smooth, continuous flow over the surface of a wing or airfoil, and it also means predictable. While that may seem obvious, it’s an important distinction. The distinction of what exactly laminar means, is that it is the opposite of turbulent, in simplest terms. In the case of an airplane, this flow occurs over streamlined parts of the airplane like a wing or fuselage. Flow is what happens as a fluid, either gas or liquid, moves in an uninterrupted fashion over an object. This project has received funding from the Clean Sky 2 Joint Undertaking under the European Union's Horizon 2020 research and innovation programme under grand agreement no CS2-LPA-GAM-2018-01.First we should define what exactly laminar flow is. HLFC-Win - HLFC Wing Components DemonstratorsĭLR Institute of Aerodynamics and Flow Technology CFD analysis to assess the overall drag benefit.Pressure loss measurements of microperforated suction skins.Aerodynamic design of the suction system.The DLR Institute of Aerodynamics and Flow Technology supports the highly multidisciplinary development process by In HLFC-Win, the researchers focus on a successful overall integration of HLFC on the upper side of the wing and aim to develop a long-term economic design by including life cycle analyses as early as possible in the design process. In order to achieve a reliable proof of concept justifying to carry on the development of such technology, a ground-based demonstrator of such a leading edge up to the front spar will be build. The application of HLFC on the wing requires a microperforated leading edge skin, a load-bearing substructure with integrated ice protection and an economic manufacturing process achieving, gaps and steps with tight tolerances associated with laminar flow. That translates to more than 3 thousand tons of CO2 saved. Scaled to annual values, HLFC is able to save 1 to 2 thousand tons of fuel per aircraft. An aircraft with HLFC applied on the wings would require somewhere between 2 to 5 tons less, each flight. HLFC offers a way to reduce frictional drag by delaying the laminar-turbulent transition of the boundary layer and thus has a significant positive impact on the aerodynamic efficiency of an aircraft. The project partners design in HLFC-Win an HLFC LE (Hybrid Laminar Flow Control Leading Edge) for an innovative wing concept with a Krueger high-lift system. Therefore, less drag results in less fuel consumption, which in turn reduces the CO2 and NOX emissions. Drag is the aerodynamic force that the engines have to overcome in order to propel the aircraft. The objective is to reduce the drag for the lift needed. ![]() One major field of research and development of environmentally friendly aircraft is higher aerodynamic efficiency. With the HLFC-Win project, Clean Sky 2 LPA (Large Passenger Aircraft) focuses on the development of an innovative wing concept. The public-private partnership between the European Commission and the European aviation industry Clean Sky 2 is intended to make the main contribution to achieving these goals. reduction of the perceived noise emissions of flying aircraft by 65%Ĭompared to the capabilities of typical new aircraft in the year 2000.To take responsibility, the Advisory Council for Aviation Research and innovation in Europe (ACARE), was set up by the European Commission and formulated several ambitious goals in the European Vision “Flightpath 2050”. The aeronautical community is aware of the environmental impact of aviation, especially when the aforementioned increase of air traffic is considered. Besides carbon dioxide, aircraft also emit noise, heat, particulates and gases such as nitrogen oxides which also contribute to the climate change. About 80% of these emissions are caused by flights beyond 1,500 kilometers, for which there is no practical alternative mode of transport, e.g., intercontinental or long-haul flights. HLFC-WIN - Innovative laminar wing concept for the low-emission aircraft of the futureĪviation is responsible for 12% of CO2 emissions from all transport sources.
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