Prediction of unstart phenomena in hypersonic aircraft

Cox, Carey F.; Lewis, Charles; Pap, Robert M.; Glover, Charles William; Priddy, K; Edwards, J.B.W.; McCarty, David; Wagner, E.

doi:10.2514/6.1995-6018

Cited by 22 publications

(14 citation statements)

References 4 publications

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“…Zha [9,10] investigated unstart transient mechanism of a typical axisymmetric HSCT (high speed civil transport) inlet at angle of attack using CFD. Cox [11] presented several mechanisms of the hypersonic inlet unstart, including backpressure unstart, overcontraction unstart and angle of attack unstart. The second approach is based on the experimental investigation.…”

Section: Introductionmentioning

confidence: 99%

“…So the classification of different hypersonic inlet operation modes, especial the classification of the inlet backpressure unstart/low Mach number unstart, is necessary to the unstart control of the hypersonic inlet. Unstart phenomena of the hypersonic inlet have been very active fields of research in last decades, there have been many investigations devoted to this subject [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Mayer and Paynter [5,6] used an Euler solver and simulated an axisymmetric inlet unstart due to the variation of freestream variables such as temperature, velocity and pressure.…”

Section: Introductionmentioning

confidence: 99%

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Operation pattern classification of hypersonic inlets

Chang

Bao

et al. 2009

Acta Astronautica

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Operation pattern classification of hypersonic inlets

Chang

Bao

et al. 2009

Acta Astronautica

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“…Zha et al [4,5] investigated the unstart transient mechanism of a typical axisymmetric inlet at different angles of attack. Cox et al [6] presented several mechanisms of supersonic inlet unstart, including backpressure unstart, overcontraction unstart, and the angle-of-attack unstart. Schmitz and Bissinger [7] and Van Wie and Kwok [8] analyzed the major factors that influence the inlet operation mode and studied the start/unstart characteristic of 2-D supersonic inlet.…”

mentioning

confidence: 99%

Catastrophe Model for Supersonic Inlet Start/Unstart

Cui

Chang

et al. 2009

Journal of Aircraft

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Mathematical models may be very valuable for studying the flow laws of supersonic inlet start/unstart. From a viewpoint of structure stability, this paper makes a link between the catastrophe points of inlet start/unstart and the singular points in Whitney's singularity theory, from which we take notice of the conception of singularity classification, which may be helpful for modeling the catastrophe points of inlet start/unstart. By further research, Thom's catastrophe theory is found to be the right mathematical tool to classify general singularities by topological method. This paper makes an effort to model the catastrophe points of inlet start/unstart by the elementary catastrophe model in catastrophe theory and puts forward a new method to fit data to the catastrophe model. The method is based on nonlinear topological transformation, which has provided an improvement over the existing Cobb's method. Simulation results have shown that the present model is in good agreement with the data. Nomenclature M = Mach number u = independent variable V = potential function x = dependent variable = angle of attack = weight coefficient = weight coefficient = the location parameter = scale parameter = mass-flow-rate coefficient Subscripts 0 = incoming flow

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“…Zha et al [8,9] investigated the unstart transient mechanism of a typical axisymmetric inlet at angle of attack. Cox et al [10] presented several mechanisms of hypersonic inlet unstart, including backpressure unstart, overcontraction unstart, and angle of attack unstart. Schmitz and Bissinger [11] and Van Wie and Kwok [12] analyzed the major factors that influence the inlet operation mode and studied the start/unstart characteristic of a twodimensional (2-D) hypersonic inlet.…”

mentioning

confidence: 99%

Multistability and Complex Routes of Supersonic Inlet Start/Unstart

Cui

2011

Journal of Propulsion and Power

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Multistability of a dynamic system consists of the ability to express multiple stable states and to switch between these states in response to some external input. From a viewpoint of dynamical system theory, the multistability and bifurcation phenomena of supersonic inlet start/unstart under the assumption of inviscid flow is analytically described. Bifurcation analysis shows the existence of multistability will result in diverse hysteresis properties in the transitions of the multiple flow patterns, and the transition routes will be considerably complex. Guided by the general principles of multistability systems, the loops-coupled hysteresis effects of inlet start/unstart are reported and analyzed. The loops-coupled hysteresis, associated with the interaction among the multiple inlet flow patterns, indicates strong route dependence of multiple flow pattern transitions. The complexity of dynamics behaviors involving loops-coupled hysteresis and complex routes originates from the memory effect of initial states and the existence of multisolution domain. The control of bifurcation system thus depends not only on the instantaneous value of the input but also on the history of its operation. A better understanding of multistability and complex routes of inlet start/unstart may be useful as a guide in thinking about the bifurcation mechanism, designing the control routes, and actively controlling the bifurcation behaviors of inlet start/unstart.

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Prediction of unstart phenomena in hypersonic aircraft

Cited by 22 publications

References 4 publications

Operation pattern classification of hypersonic inlets

Operation pattern classification of hypersonic inlets

Catastrophe Model for Supersonic Inlet Start/Unstart

Multistability and Complex Routes of Supersonic Inlet Start/Unstart

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