Laminar airfoil suitable for general-purpose aircraft and with focus on cruise characteristic

Abstract

The invention provides a laminar airfoil TFNLF3 with focus on a cruise characteristic and with a maximum relative thickness of 0.17 by adopting a computational fluid dynamics method and an airfoil parametrization method based on the NLF0416 airfoil which is published internationally and with consideration to cruise, climbing and stall for the design state and. The radius of the leading edge of the laminar airfoil TFNLF3 is 2.14%C; the maximum thickness of the same is 17.22%C; the location of the maximum thickness is 40.42% C; the maximum camber of the same is 1.35%C; the location of the maximum camber is 82.19% C; the thickness of the trailing edge of the laminar airfoil TFNLF3 is 0.42%C; and C is the chord length of the laminar airfoil TFNLF3. Under the circumstance that the stall and climbing performance is maintained or is slightly better than that of the NLF0416 airfoil, the laminar airfoil TFNLF3 has the advantages of better improving the cruise performance, increasing the cruising lift-to-drag ratio to a certain extent, reducing the absolute value of the cruising moment and reducing the cruising trim drag. When the cruise state is mainly controlled by laminar flow, the length of the flow region of an upper airfoil surface is 45% and the length of the flow region of a lower airfoil surface is 65%.

Description

technical field [0001] The invention relates to the field of airfoil design in the aerodynamic shape design of aviation aircraft, in particular to a laminar flow airfoil suitable for general-purpose aircraft with emphasis on cruising characteristics. Background technique [0002] General-purpose aircraft refers to all other civil aircraft except regular airline flights for passenger and cargo transportation. Its application fields include industry, agriculture, forestry, scientific research, tourism, sports, urban management and ambulance, training and official flight, etc. Referring to the experience of developed countries, general aviation, as an important part of the civil aviation industry, plays a great role in promoting the country's economic development and urban transportation. With the strengthening of our country's national strength and the improvement of people's income, following the popularization of automobiles, we will soon enter a period of rapid development ...

AI Technical Summary

Problems solved by technology

However, it is still only a low-speed constant-lift single-working-condition design, and there is no research on the performance of multiple working conditions.

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