A planar Mie scattering technique for visualizing supersonic mixing flows

Abstract

A planar Mie scattering technique is described which allows for the direct visualization of fluid mixing in supersonic flows. The mixed fluid is visualized by laser light sheet scattering from small alcohol droplets which condense as a result of the mixing of a vapor laden subsonic stream with a cold supersonic stream. Issues related to the formation, growth and size of the droplets are addressed. The technique reveals details of the turbulent structure which are masked by the spatial integration of schlieren and shadowgraph methods. Comparative visualizations using the vapor screen method to uniformly mark the high-speed fluid are also shown.

Ejector refrigeration: A comprehensive review

“…Of particular importance is the dissipative effect of the shock trains as it produces a compression and a shift from supersonic to subsonic conditions. There is considerable research concerning experimental [46][47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62][63][64][65] and numerical [66][67][68][69][70][71][72][73][74][75][76][77][78][79][80][81] studies of the flow phenomena inside an ejector. Even further detailed knowledge and modeling of these phenomena should allow for better component design.…”

Compressible Mixing Layers with and without Particles

“…Hanson et al, 19901. In scattering techniques, Mie scattering[e.g., 3 Samimy et al 1991b, Clemens and Mungal, 1991, Messersmith et al, 1991, Komine et al, 19911, or Rayleigh scatteringle.g. Miles et al, 1991 This situation is illustrated in Fig.…”

Simultaneous 5 kHz OH-PLIF/PIV for the study of turbulent combustion at engine conditions

“…To accurately measure the flow velocity in these regions, the time scale of the particle response must be small in comparison with the time scales of the local flow velocity fluctuations (see Sect. 3.1) [25][26][27][28][29][30].…”