Scientific and Technical Aerospace Reports
Scientific and Technical Aerospace Reports

Author:

Publisher:

Published: 1990

Total Pages: 976

ISBN-13:

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Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

An Empirical Equation for Prediction of Transition Location on Cones in Super-or Hypersonic Flight
An Empirical Equation for Prediction of Transition Location on Cones in Super-or Hypersonic Flight

Author: Neal Tetervin

Publisher:

Published: 1973

Total Pages: 46

ISBN-13:

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An empirical equation has been developed for the prediction of transition location on blunt and sharp cones. The equation predicts the transition location fairly well for 48 ballistics range tests for cones without ablation and for 40 flight tests for cones with ablation ranging from zero to large. The equation is applicable for cones in supersonic or hypersonic flight. The experimental data cover a range of local Mach numbers at transition from 2.8 to 14.7 and a range of the ratio of local wall to local stream temperature at transition from .074 to 1.43.

Laminar-Turbulent Transition
Laminar-Turbulent Transition

Author: D. Arnal

Publisher: Springer Science & Business Media

Published: 2012-12-06

Total Pages: 706

ISBN-13: 3642841031

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The subject of laminar-turbulent transition is of considerable practical importance and has a wide range of engineering applications. For this reason, the International Union of Applied Mechanics decided to sponsor a third Symposium on "Laminar-Turbulent Transition", which would be organised by the ONERA Toulouse Research Center and held at "Ecole Nationale Superieure de l'Aeronautique et de l'Espace" in 1989. It was supposed that like the two previous IUTAM Symposia (Stuttgart 1979 and Novosibirsk 1984) the symposium would be devoted to experimental of laminar-turbulent transition In fluids, i.e. the and theoretical studies physical problem of transition and mathematical modelling in shear flows. The contributed papers were selected by the Scientific Committee from extended abstracts. The larger number of highly qualified papers submitted for presentation led us to include in the program poster sessions, which could be held during morning, lunch and afternoon breaks, and to take the decision that the symposium should last five days (from Monday 11 to Friday 15 September). An excursion on Wednesday offering a well deserved rest and the occasion of new personal exchanges between the participants seems to have been appreciated by all. The symposium consisted of 8 invited lectures and 62 contributed pa pers presented either on oral or poster sessions.

Combined Asymptotics and Numerical Methods in Transonic Store Interactions
Combined Asymptotics and Numerical Methods in Transonic Store Interactions

Author: Norman D. Malmuth

Publisher:

Published: 2002

Total Pages: 206

ISBN-13:

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Combined asymptotic and numerics procedures were coupled with dynamics equations to simulate two and three-degree of freedom store separation from cavities. New solutions were obtained that provide insight into how the shear layer can interact with the body motion and cause re-contact and ricochet with the parent body. The theoretical models simulated these phenomena by adjustment of initial launch conditions such as initial plunge and pitch velocities among other lumped groups. Details of the structure of the near and far fields of the separating store were obtained by a combination of asymptotic analysis and function theory. Trajectory bifurcation producing a quick transition from one pitch trajectory to another was correlated with shear layer interactions and our experiments. This also produced a jump in the phase of oscillatory pitch. Transonic flows were considered and the significance of wave drag to the trajectory history was assessed within the nonlinear framework of Karman-Guderely transonic small disturbance theory.