Use of a Colored Water Surface Flow Visualization Technique in a Supersonic Wind Tunnel to Investigate Cavity Flow Fields

Wilcox, Floyd J.

doi:10.1007/978-3-642-84824-7_4

Cited by 8 publications

(7 citation statements)

References 1 publication

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“…34. This complex shock system is consistent with higher axial force levels and is a serious CEV acoustic loads issue 11 . The flow separation from this asymmetric configuration with multiple protuberances in combination with the flexible balance and sting assembly yielded a dynamic model response at the higher angles of attack in UPWT T. S. 1.…”

Section: Ares I Adac-2a Force and Moment Datasupporting

confidence: 66%

“…Sublimation occurred slowly along the aft section of the LAS tower and the forward section of the CEV, which suggested a region of separated or re-circulating flow. The latter phenomenon was confirmed in limited flow visualization runs using a colored alcohol technique 11 to visualize the local surface flow behavior. Bottles of colored alcohol were located outside the test section and were connected to selected pressure lines attached to orifices on the 0-degree azimuth on the LAS tower and CEV.…”

Section: B Ares I Adac-1 Pressure Datamentioning

confidence: 64%

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Ares I Aerodynamic Testing at the NASA Langley Unitary Plan Wind Tunnel

Erickson

Wilcox

2011

49th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

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Section: Ares I Adac-2a Force and Moment Datasupporting

confidence: 66%

Section: B Ares I Adac-1 Pressure Datamentioning

confidence: 64%

Ares I Aerodynamic Testing at the NASA Langley Unitary Plan Wind Tunnel

Erickson

Wilcox

2011

49th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

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“…Notable publications include Wilcox (1992), Dolling, Perng & Leu (1997), Larcheveque, Sagaut & Labbe (2007), Knowles, Ritchie & Lawson (2007) and Atvars et al (2009). Furthermore, there appears to be a shortage of literature in low speed cavity flows (Sarohia 1977;Milbank 2004;Ozsoy et al 2005;Manovski, Giacobello & Soria 2008).…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional flow within shallow, narrow cavities

Crook¹,

Lau

Kelso

2013

J. Fluid Mech.

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The three-dimensional structure of incompressible flow in a narrow, open rectangular cavity in a flat plate was investigated with a focus on the flow topology of the time-averaged flow. The ratio of cavity length (in the direction of the flow) to width to depth was l:w:d = 6:2:1. Experimental surface pressure data (in air) and particle image velocimetry data (in water) were obtained at low speed with free-stream Reynolds numbers of Re l = 3.4×10 5 in air and Re l = 4.3×10 4 in water. The experimental results show that the three-dimensional cavity flow is of the 'open' type, with an overall flow structure that bears some similarity to the structure observed in nominally twodimensional cavities, but with a high degree of three-dimensionality both in the flow near the walls and in the unsteady behaviour. The defining features of an open-type cavity flow include a shear layer that traverses the entire cavity opening ultimately impinging on the back surface of the cavity, and a large recirculation zone within the cavity itself. Other flow features that have been identified in the current study include two vortices at the back of the cavity, of which one is barely visible, a weak vortex at the front of the cavity, and a pair of counter-rotating streamwise vortices along the sides of the cavity near the cavity opening. These vortices are generally symmetric about the cavity centre-plane. However, the discovery of a single tornado vortex, located near the cavity centreline at the front of the cavity, indicated that the flow within the cavity is asymmetric. It is postulated that the observed asymmetry in the time-averaged flow field is due to the asymmetry in the instantaneous flow field, which switches between two extremes at large time scales.

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“…A variety of control methods have been tested and their effects on the cavity flow field documented. 1,9,31,36,54,55) Past researches have established that the defining parameter for these flows is their length-to-depth ratio (L/D). The effects of cavity width-to-length ratio (L/W ) were investigated by Ahuja and Mendoza, 28) Tracy and Plentovich, 30) Stallings and Wilcox, 2) et al Ahuja and Mendoza distinguished the cavity flow to be two-dimensional (2D) or three-dimensional (3D) depending on whether its L/W is less than or greater than 1.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Mechanism of Flow-Type Changes in Supersonic Cavity Flows.

Zhang

Morishita

Okunuki

et al. 2002

Trans. Japan Soc. Aero. S Sci.

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Compressible flows over cavities with a series value of length-to-depth ratio (L/D) were investigated experimentally, with the objective being to elucidate the mechanism of the transition of types of cavity flows as their L/D increases or decreases. For open-type cavity flows, the freedom of backflow inside the cavity is found to be crucial in smoothing out adverse pressure gradient. The spreading of the shear layer and its gradual approach toward the cavity floor as L/D increases tend to suppress the freedom of backflow, causing the cavity flow to change from the open-type to the transitional-type. For closed-type cavity flows, the finite thickness of the upstream boundary layer leads to the presence of three kinds of characteristic lengths that correspond to the recirculation region, the deflection of the main flow and the recovery or the abrupt rise of the pressure, respectively. The compression fans at the foot of the impingement and the exit shock waves will approach each other well in advance of the possible merge of the vertices of the conventionally defined separation and recompression wakes. As the L/D of a closed cavity decreases, the reattached boundary layer on the mid-portion of the cavity floor will have less developing distance, thus it will be more susceptible to adverse pressure gradient and prone to separation. For the present two-dimensional cavity models, the critical values of L/D were found to be about 10 and 14 for the transition of cavity flows from the open-to the transitional-type and from the transitionalto the closed-type, respectively. The sum of the pressure lengths at the front and rear wakes agrees remarkably well with the second critical L/D.

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Use of a Colored Water Surface Flow Visualization Technique in a Supersonic Wind Tunnel to Investigate Cavity Flow Fields

Cited by 8 publications

References 1 publication

Ares I Aerodynamic Testing at the NASA Langley Unitary Plan Wind Tunnel

Ares I Aerodynamic Testing at the NASA Langley Unitary Plan Wind Tunnel

Three-dimensional flow within shallow, narrow cavities

Experimental Investigation on the Mechanism of Flow-Type Changes in Supersonic Cavity Flows.

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