Laminar flow aerofoil profile with emphasis on stall characteristic applicable to common aero vehicle

Abstract

The invention provides a laminar flow aerofoil profile FNLF1 with maximum relative thickness of 0.17 and with an emphasis on stall characteristic by using a computer fluid dynamics method and an aerofoil profile parameterization method and taking a cruising point, a climbing point and a stalling point into consideration in state design on the basis of the internally public NLF0416 aerofoil profile. The leading edge radius of the laminar flow aerofoil profile FNLF1 is 2.11% of C, the maximum thickness of the laminar flow aerofoil profile FNLF1 is 17% of C, the maximum thickness position of the laminar flow aerofoil profile FNLF1 is 5.37% of C, the maximum camber of the laminar flow aerofoil profile FNLF1 is 1.88% of C, the maximum camber position of the laminar flow aerofoil profile FNLF1 is 76.29% of C and the trailing edge thickness of the laminar flow aerofoil profile FNLF1 is 0.43% of C, wherein C is the chord length of the aerofoil profile. In the case that the climbing and cruising performances of the laminar flow aerofoil profile FNLF1 are kept at or slightly superior to those of the NLF0416, the stalling angle of attack of the laminar flow aerofoil profile FNLF1 is delayed and the stall characteristic of the laminar flow aerofoil profile FNLF1 is slowed; and in case that the cruising state is the laminar flow main control, the length of an upper wing surface laminar flow area reaches 48% and the length of an lower wing surface laminar flow area reaches 53%.

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 stall 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 of ...

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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