![]() ![]() It is also indicated that with transition fixed at about 10% chord the drag levels were similar to other airfoils with turbulent boundary layers. In theory, keeping the flow of air over a wing laminar, that is, smooth and free of even very small. The minimum drag for the airfoils was found to range from 0.0045 to 0.0051, representing far lower levels than any airfoil dominated by turbulent boundary layer. Its first great success was the so-called laminar flow airfoil used on the P-51 Mustang. To address this need, we develop a discrete adjoint-based optimization framework where transition is. ![]() However, there is a lack of tools for performing shape optimization of wings based on computational fluid dynamics considering laminar-to-turbulent transition. It was found that all the airfoils showed the presence of a drag bucket close to design conditions and long lengths (in some cases about 70%) of natural laminar flow at Reynolds number 6.7 million. Natural laminar-flow wings are one of the most promising technologies for reducing fuel burn and emissions for commercial aviation. Their design Mach numbers were 0.8, 0.76, 0.72 and 0.68 respectively and the design chord Reynolds number was 12.5 million. The airfoils have maximum thickness to chord ratios of 0.10, 0.13, 0.16 and 0.21 and were designed for a lift coefficient of CL = 0.6. This report contains an analysis of the experimental results obtained from four supercritical natural laminar flow (NLF) airfoils investigated in the NAE High Reynolds Number Test Facility. You can actually get a plane with this wing On-the-step, so in cruise, you can. National Research Council Canada, National Aeronautical Establishment The advantages of a laminar flow wing are that it is fast with less drag. The third airfoil is the NLF(1)-O414F and is reported in reference 3. ![]() A Summary of Transonic Natural Laminar Flow Airfoil Development at NAE designed for a Mach number of 0.2 with approximately 30-percent laminar flow on the upper surface and 40-percent laminar flow on the lower sur-face, and likewise, the NLF(1)-0215F was designed for 40-percent laminar flow on the upper surface and 60-percent on the lower surface. ![]()
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