Topic
Pitching moment
About: Pitching moment is a research topic. Over the lifetime, 3213 publications have been published within this topic receiving 38721 citations.
Papers published on a yearly basis
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TL;DR: In this paper, a new concept of increasing the aerodynamics of the scramjet nozzle with energy addition is presented, where the essence of the method is to create a heated region in the inner flow field of the scrambling nozzle.
18 citations
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TL;DR: In this paper, the effects of two blown jets on the aerodynamic characteristics of a 20°7o-thick, 8.5 % -cambered elliptical airfoil are described.
Abstract: Effects of two blown jets on the aerodynamic characteristics of a 20°7o-thick, 8.5 % -cambered elliptical airfoil are described. The jet slots are designed so that the jets are tangential to the blunt rear surface of the airfoil. Section lift, drag, and moment coefficients are given for the airfoil at 0-deg angle of attack for a freestream wind tunnel velocity of approximately 30 m/s (98-100 ft/s) and a Reynolds number of 9.5 x 105. Two jets are found to be more effective in producing lift than a single jet at the same total blowing momentum coefficient.
18 citations
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01 Mar 198618 citations
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02 Aug 2009TL;DR: In this article, a wind tunnel sting balance was processed using a search algorithm that identifies an optimized regression model for the data analysis, which is a rare example of a situation when regression models of balance calibration data can directly be derived from first principles of physics and engineering.
Abstract: Calibration data of a wind tunnel sting balance was processed using a search algorithm that identifies an optimized regression model for the data analysis. The selected sting balance had two moment gages that were mounted forward and aft of the balance moment center. The difference and the sum of the two gage outputs were fitted in the least squares sense using the normal force and the pitching moment at the balance moment center as independent variables. The regression model search algorithm predicted that the difference of the gage outputs should be modeled using the intercept and the normal force. The sum of the two gage outputs, on the other hand, should be modeled using the intercept, the pitching moment, and the square of the pitching moment. Equations of the deflection of a cantilever beam are used to show that the search algorithm s two recommended math models can also be obtained after performing a rigorous theoretical analysis of the deflection of the sting balance under load. The analysis of the sting balance calibration data set is a rare example of a situation when regression models of balance calibration data can directly be derived from first principles of physics and engineering. In addition, it is interesting to see that the search algorithm recommended the same regression models for the data analysis using only a set of statistical quality metrics.
18 citations
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TL;DR: In this article, the authors examined the unsteady aerodynamic characteristics of morphing wings with upward and downward deflections of the leading-edge at different frequencies, and found that the downward deflection increases the stall angle of attack and nose-down pitching moment.
18 citations