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Pitching moment

About: Pitching moment is a research topic. Over the lifetime, 3213 publications have been published within this topic receiving 38721 citations.


Papers
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Patent
09 Mar 1967

9 citations

Proceedings ArticleDOI
09 Jan 2017

9 citations

Journal ArticleDOI
TL;DR: Recommendations are made for additional improvements in nozzle calibrations using non–intrusive methods and for an increased use of CFD for the design of experiments, the definition of the test environment, the interpretation of the results and the extrapolation to flight.
Abstract: The paper focuses on the experiments performed in the European high–enthalpy facilities during the crewed space flight hypersonic ground testing technology programme. Emphasis is placed on simple configuration testing enabling validation of the physical modelling within non–equilibrium Navier–Stokes codes. The high–enthalpy facilities used are the ONERA hot shot F4 and the DLR Stalker tube HEG. The simple configurations are the Nozzle, the Electre blunt code, the hyperboloid flare, and the 70 degree blunt cone. In addition to these axisymmetric configurations, the Halis/Orbiter configuration was extensively tested and numerically computed to validate the ground to flight extrapolation methodology. Real gas effects on aerodynamic forces and in particular on pitching moment for the Halis have been reproduced in the F4 and compared with flight. The paper concludes with a series of recommendations for additional improvements in nozzle calibrations using non–intrusive methods and for an increased use of CFD for the design of experiments, the definition of the test environment, the interpretation of the results and finally the extrapolation to flight.

9 citations

01 Jan 1938
TL;DR: In this paper, the experimental and calculated aerodynamic characteristics of 22 tapered wings are compared, using tests made in the variable-density wind tunnel, and the results are in sufficiently good agreement that the method may be applied to many problems of airplane design.
Abstract: The experimental and calculated aerodynamic characteristics of 22 tapered wings are compared, using tests made in the variable-density wind tunnel. The wings had aspect ratios from 6 to 12 and taper ratios from 1:6:1 and 5:1. The compared characteristics are the pitching moment, the aerodynamic-center position, the lift-curve slope, the maximum lift coefficient, and the curves of drag. The method of obtaining the calculated values is based on the use of wing theory and experimentally determined airfoil section data. In general, the experimental and calculated characteristics are in sufficiently good agreement that the method may be applied to many problems of airplane design.

9 citations

Journal ArticleDOI
TL;DR: A three-degrees-of-freedom (3-DOF) dynamic model in the longitudinal plane is built based on the aerodynamic coefficients obtained in the simulations, to predict its gliding performance, and it is proved to be longitudinally stable.
Abstract: Flying fish is a family of unique aerial-aquatic animals, which can both swim in the water and glide over the sea surface. Most previous studies on their aerodynamic characteristics were based on field observations or measurements of their morphometric parameters. In the present study, we consider three different flying fish models, of which the preliminary one mimics the Cypselurus hiraii in the pectoral fin morphology, following a previous wind tunnel experiment (Park and Choi 2010 J. Exp. Biol. 213 3269-79). Their aerodynamic performances are numerically studied by the computational fluid dynamics (CFD) method. The maximum lift force coefficient of 1.03 is reached at the angle of attack [Formula: see text], and the maximum lift-to-drag ratio of 4.7 is achieved at [Formula: see text]. By choosing appropriately the center of gravity, the flying fish model is proved to be longitudinally stable, according to the negative slope of pitching moment profile. Furthermore, we build a three-degrees-of-freedom (3-DOF) dynamic model in the longitudinal plane based on the aerodynamic coefficients obtained in our simulations, to predict its gliding performance. The results show that the flying fish can achieve a distance up to 45.4 m, and reach a height of 13.2 m, indicating an extraordinary gliding performance. Our numerical simulations are consistent with previous experimental results and theoretical prediction, which can be taken as the basis of further research on robotic flying fish.

9 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202353
202294
202168
202076
201983
201886