Turbulence characteristics of supersonic corner flows in a low aspect ratio rectangular channel

Abstract

In this study we present the experimental results of stereo particle image velocimetry conducted in the corner of a Mach 2.75 low aspect ratio rectangular channel flow. Data is recorded at multiple cross-section planes and analyzed to study the formation of corner vortices and their effects on the structure of the mean flow field. Results show that several vortex elements exist instantaneously in

Swept shock corner flow interacions

“…Measurements in TV configuration were also made in the tunnel without the wedge to study the secondary flows in the corner which exist without any presence of shock at x = −100mm, x = −50mm and x = 75mm. These flowfields are discussed in detail in our other work [27].…”

“…The choice of these planes allows us to analyze the secondary flow patterns in the upstream influence region of the SBLI and at the nominal interaction location of the incident SBLI. Also, data in the corner region of the undisturbed duct flow is available at a location of x = 75mm for comparison [27]. Separation bubble height profile as defined by Piponniau et al [28] and Souverein et al [29] is used to compute the profile of the region affected by flow separation for each instantaneous velocity field in the dataset.…”

“…In practice, the lowpass filtering operation was carried out with a moving average filter of size of 0.5 mm × 0.5 mm operation. This approach follows our companion study [27] of the structure of the corner flow by first performing a scale decomposition, where an instantaneous field is decomposed into a large and a small scale contributions. It is the large scale contribution that is responsible for the evolution of the corner vortex system; while the small scale captures the underlying turbulent features.…”

“…The large scale vortex features were then extracted after applying the the TDM, from which rigid rotation vorticity ω RR is extracted. The identification of the corner vortex then followed using the definition introduced in the companion work [27].…”

Direct numerical simulation of developed compressible flow in square ducts

“…The subscript e refers to duct centerline values. The dashed line denotes the generalized temperature/passive scalar relation given in equation(16).…”