Experimental Investigation of Liquid Fragmentation In Hypersonic Crossflow

Study on breakup of liquid ligaments in hypersonic cross flow using laser sheet imaging and infrared light extinction spectroscopy

“…The breakup of the liquid jet issued from a §at plate surface exposed to Mach 6 hypersonic §ow was investigated in detail in [10] from where Fig. 4 was taken to Figure 4 Liquid jet injected in hypersonic cross §ow over a §at plate model [10]: (a) schematic representation; and (b) combination of Schlieren and front lighting droplet cloud measurements for §at plate represent schematically the process that takes place in this situation.…”

“…4 was taken to Figure 4 Liquid jet injected in hypersonic cross §ow over a §at plate model [10]: (a) schematic representation; and (b) combination of Schlieren and front lighting droplet cloud measurements for §at plate represent schematically the process that takes place in this situation. The water jet enters into the hypersonic §ow and penetrates at a certain extent depending on the momentum ratio of the incoming hypersonic gas §ow and the injected water §ow.…”

“…An overview of liquid injection into compressible §ow can be found in [3], jet penetration height into a compressible cross §ow in the range of Mach 2 to Mach 4 was investigated in [48], and droplets were exposed to Mach 5 cross §ow in a shock tube in [9]. A liquid jet in a Mach 6 cross §ow over a §at plate was investigated in detail in [10]. Droplet size distribution measurements are rarely available and they were performed, mainly, by Phase Doppler Interferometry (PDI) or backlighting imaging.…”

A matching approach to communicate through the plasma sheath surrounding a hypersonic vehicle

“…Liquids like water and other electrophilic liquids have already been tested as quenchants in many experiments. [11][12][13] However, this approach may be not work well for hypersonic cruise vehicles, because the weight and volume of liquids carried by the vehicles can be prohibitive. The last method is communication through plasma sheaths via Raman scattering process, which is to place a source of an intensive, high frequency electromagnetic pump wave on the vehicle and to use the nonlinearity of the medium to create a backscattered Stokes wave through the interaction of the pump wave with the signal-carrying wave sent by a ground transmitter.…”