Application of computational design techniques to the development ofscramjet engines

Wie, David Van; White, Michelle; Waltrup, P.

doi:10.2514/6.1987-1420

Cited by 1 publication

(1 citation statement)

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“…Figure 3 shows the start/unstart characteristics of a supersonic inlet diffuser. The characteristics are predicted by two limits: the Kantrowitz-Donaldson limit [14][15][16][17] and isentropic contraction limit [18]. Previous studies demonstrated that these two limits can be applied to predicting the start/unstart states of the Busemann biplane (two-dimensional) [11,12].…”

Section: Introductionmentioning

confidence: 99%

Wind Tunnel Testing on Start/Unstart Characteristics of Finite Supersonic Biplane Wing

Yamashita

Kuratani

Yonezawa

et al. 2013

International Journal of Aerospace Engineering

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This study describes the start/unstart characteristics of a finite and rectangular supersonic biplane wing. Two wing models were tested in wind tunnels with aspect ratios of 0.75 (model A) and 2.5 (model B). The models were composed of a Busemann biplane section. The tests were carried out using supersonic and transonic wind tunnels over a Mach number range of0.3≤M∞≤2.3with angles of attack of 0°, 2°, and 4°. The Schlieren system was used to observe the flow characteristics around the models. The experimental results showed that these models had start/unstart characteristics that differed from those of the Busemann biplane (two dimensional) owing to three-dimensional effects. Models A and B started at lower Mach numbers than the Busemann biplane. The characteristics also varied with aspect ratio: model A (1.3<M∞<1.5) started at a lower Mach number than model B (1.6<M∞<1.8) owing to the lower aspect ratio. Model B was located in the double solution domain for the start/unstart characteristics atM∞=1.7, and model B was in either the start or unstart state atM∞=1.7. Once the state was determined, either state was stable.

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