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Appl. Sci. 2018, 8(11), 2320; https://doi.org/10.3390/app8112320

Interpolation of Turbulent Boundary Layer Profiles Measured in Flight Using Response Surface Methodology

1
Research and Development Directorate, Japan Aerospace Exploration Agency, Kakuda, Miyagi 981-1525, Japan
2
Aeronautical Technology Directorate, Japan Aerospace Exploration Agency, Chofu, Tokyo 182-8522, Japan
*
Author to whom correspondence should be addressed.
Received: 5 October 2018 / Revised: 15 November 2018 / Accepted: 16 November 2018 / Published: 21 November 2018
(This article belongs to the Section Mechanical Engineering)
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Abstract

Turbulent boundary layer profiles on the aircraft surface were characterized by pitot-rake measurements conducted in flight experiments at high subsonic Mach number ranges. Due to slight variations in atmospheric air conditions or aircraft attitudes, such as angles of attack and absolute flight speeds at different flights even under the same premised flight conditions, the boundary layer profiles measured at different flights can exhibit different shape and velocity values. This concern leads to difficulty in evaluating the efficiency of using some kind of drag-controlling device such as riblets in the flight test, since the evaluation would be conducted by comparing the profiles measured with and without using riblets at different flights. An approach was implemented to interpolate the boundary layer profile for a flight condition of interest based on the response surface method, in order to eliminate the influence of the flight conditional difference. Results showed that the interpolation with the 3rd-degree response surface model with a combination of two independent variables of flight Mach number and total pressure successfully eliminated the influence of the flight conditional difference, and interpolated the boundary layer profiles measured at different flights within an inaccuracy of 4.1% for the flight Mach number range of 0.5 to 0.78. View Full-Text
Keywords: response surface methodology; data interpolation; flight experiment; turbulent boundary layer response surface methodology; data interpolation; flight experiment; turbulent boundary layer
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Takahashi, H.; Kurita, M.; Iijima, H.; Sasamori, M. Interpolation of Turbulent Boundary Layer Profiles Measured in Flight Using Response Surface Methodology. Appl. Sci. 2018, 8, 2320.

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