ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Trajectory reconstruction and analysis of nonlinear angular motion of hypersonic free-flight non-spinning cones
Received date: 2015-11-18
Revised date: 2016-12-08
Online published: 2016-03-28
Supported by
National Natural Science Foundation of China (11202200)
Employing multi-stage curve fitting procedure, the observations of hypersonic non-spinning blunt cones wind-tunnel free-flight tests with biplanar optical system are analyzed by nonlinear fitting. Perfect coincidence is acquired between the fitting curves and observations, and then trajectory reconstruction of the nonlinear angular motion of the models is achieved. Complex angle of attack and resultant angle of attack curves are obtained for five tests, and then the characteristics of the nonlinear angular motion of the non-spinning blunt cones are analyzed. The rotating direction of complex angle of attack curves is uncertain, and both clockwise and anticlockwise are present, sometimes there is even a change in rotating direction. Most complex angle of attack curves present elliptical cone motion, and the magnitude and direction of the long axis of ellipse are probably variable. The magnitude of resultant angle of attack decreases in general, though it is oscillatory. Due to the nonlinear characteristics, different characteristics exist for the angular motion with identical model at different preset angles of attack.
JIANG Zenghui , SONG Wei , LU Wei , CHEN Nong . Trajectory reconstruction and analysis of nonlinear angular motion of hypersonic free-flight non-spinning cones[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016 , 37(10) : 2932 -2940 . DOI: 10.7527/S1000-6893.2016.0088
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