Interaction of Decaying Freestream Turbulence with a Moving Shock Wave: Pressure Field

Abstract

The unsteady interaction of a moving shock wave with nearly homogeneous and isotropic decaying compressible turbulence has been studied experimentally in a large-scale shock-tube facility by using rectangular grids of various sizes. The interaction has been investigated by measuring velocity, total pressure, and temperature inside the ow eld and static pressure at the wall of the shock tube with instrumentation of temporal and spatial resolution. Attenuation of the shock wave strength has been found to take place as a result of the interaction with the turbulent ow eld, which depends on the mesh size of the grid or its Reynolds number, the ow Mach number, and the initial Mach number of the shock wave. Finer grids produce turbulence, which attenuates the shock wave more than coarse grids at the same Mach number. Ampli cation of pressure uctuations after the interaction has been observed in all experiments, depending on grid size (initial turbulence level) and shock strength. Furthermore, this ampli cation is not the same through the whole range of wave numbers resolved.

Studies of interactions of a propagating shock wave with decaying grid turbulence: velocity and vorticity fields

“…DNS and LIA can account for such perturbations while RDT is unable to do so. Some evidence possibly showing the effects of turbulence on the shock wave can be found in the work of Xanthos et al (2002) where the influence of grid solidity and mesh size on the transmitted shock wave has been investigated. Their mean pressure data along the working section are plotted against their normalized distance from the grid location in figure 23.…”

“…These measurements, particularly those that include measurement of the full velocity gradient tensor, are extremely difficult to carry out and the results obtained are the first attempted in this type of compressible flow. The work by Xanthos, Briassulis & Andreopoulos (2002) describes the behaviour of the pressure field during the shock wave interaction with free-stream turbulence. A full description and documentation of the incoming compressible decaying turbulence before the interaction can be found in Briassulis et al (2001, hereafter referred to as BAA).…”

Velocity and temperature fluctuations in a high-speed shock–turbulence interaction

“…Measurement techniques Measured quantities Agui et al (2005) shock tube 1.04-1.392 0.01-0.05 260-1300 hot-wire P, T t , ρU Barre et al (1996) blowdown 3 0.011 15.5 hot-wire, LDV U Briassulis & Andreopoulos (1996) shock tube 1.551-2.183 0.02-0.06 162-735 hot-wire P, T t , ρU Haas & Sturtevant (1987) shock tube 1.007-1.1 --spark shadowgraphy pressure - Hesselink & Sturtevant (1988) shock tube 1.007-1.1 --schlieren, shadowgraphy - Honkan & Andreopoulos (1990) shock tube 1.62 0.050 ∼1000 hot-wire P, T t , ρU Honkan & Andreopoulos (1992) shock tube 1.62 0.033 ∼1000 hot-wire P, T t , ρU Honkan et al (1994) shock tube 1.24 0.040 ∼1000 hot-wire P, T t , ρU Jacquin & Geffroy (1997) Trolier & Duffy (1985) shock tube ---hot-wire P, T t , ρU Xanthos et al (2002) shock tube 1.1-1.3 -160-1300 hot-wire, Raleigh scattering P, T t , ρU Current Work pulsed 4.4 0.052-0.083 -MTV, PLIF U, T Table 2. Current experimental works in canonical STI.…”

Facility for Shock and Detonation Wave Interaction with a Reactive Turbulent Field

“…Diagnostics for studying the flow include those based on density fluctuations, 18,19,27 hot-wire anemometry, 20,21,28 laser Doppler velocimetry 24 and pressure. 29 The mutual interaction between the shock and the turbulence results in an increase in turbulence, details of which can be found in the above-cited studies. This turbulence amplification has been proposed for increasing mixing as in scramjet combustors 30 and as a mechanism for deflagration-to-detonation transition.…”