Investigation of the double ramp in hypersonic flow using luminescent measurement systems

Abstract

Compression ramp flows in supersonic and hypersonic environments present unique flow patterns for shock wave-boundary layer interaction studies. They also represent the generic geometry of two-dimensional inlets and deflected control surfaces for re-entry vehicles. Therefore, a detailed

Static and Wind-on Performance of Polymer-Based Pressure-Sensitive Paints Using Platinum and Ruthenium as the Luminophore

“…Relatively small changes in terms of the normalised intensity ratio are observed in both the PtTFPP and Ru (II) polymer-based PSPs when the temperature ratio is approaching T/T ref = 1. In fact, a similar phenomenon was also documented in the studies conducted by Yang et al [13] and Gongora-Orozco et al [35]. However, the authors in [13] and [35] did not explain the reasons that might lead to the occurrence of this phenomenon.…”

“…In fact, a similar phenomenon was also documented in the studies conducted by Yang et al [13] and Gongora-Orozco et al [35]. However, the authors in [13] and [35] did not explain the reasons that might lead to the occurrence of this phenomenon. Similar to the pressure sensitivity, the gradient of the plotted lines in Figure 7 shows the temperature sensitivity of the two polymer-based PSPs being studied.…”

“…Furthermore, the flow pattern over the surface of an object can be visualised through the “colour map” obtained from the PSP measurements. Throughout the years, many pressure-sensitive paint formulations have been developed and applied to different scenarios, ranging from typical surface pressure measurements on various objects in wind tunnel tests at different speeds [9,10,11,12,13,14,15] to flow and shock structures visualisation [14,15,16], as well as used for measuring altitudes [17]. …”

Survey of high-enthalpy shock facilities in the perspective of radiation and chemical kinetics investigations

“…Recent studies [49] have allowed the investigation of Göertler vortices for hypersonic Mach numbers as well as the development of measurement techniques [50,51].…”

Transverse jet-cavity interactions with the influence of an impinging shock

“…[32][33][34][35][36][37] The in-house developed PSP technology used in the present study has been successfully applied in a variety of flow conditions and has been found in all cases to provide accurate pressure measurements when compared to conventional pressure transducers. [38][39][40][41][42][43][44] The PSP setup consists of a LaVision Image Intense 12-bit CCD camera with a 590nm long-pass filter mounted on the lens, and UV LEDs with peak wavelength of 390nm were used for image acquisition. Ruthenium is used as the luminohpore molecules in the current recipe.…”