Breakup of liquid sheets and jets in a supersonic gas stream

Schetz, Joseph A.; Sherman, A.

doi:10.2514/3.6246

Cited by 49 publications

(7 citation statements)

References 9 publications

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“…This is because the injection momentum is high, which leads to the liquid jet becoming more robust in supersonic crossflow. Due to high density of the supersonic crossflow, aerodynamic force makes droplets shear from the liquid jet directly which is in line the shear breakup regime reported in many studies (Sherman and Schetz, 1971; Li and Karagozian, 1992). In the spray field far from the nozzles, aerodynamic force dominates the motion of droplets compared with the injection velocity of the droplets.…”

Section: Resultssupporting

confidence: 76%

“…Effects of different operating parameters and type of atomizers on the mixing performance were discussed. On the liquid behavior in the supersonic crossflow, experimental studies have been implemented since 1970s (Horn et al , 1968; Sherman and Schetz, 1971; Nejad and Schetz, 1984). The early stage of these experiments only obtained marcoscopical results such as the characteristics of penetration and the effect of liquid properties.…”

Section: Introductionmentioning

confidence: 99%

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Numerical investigation of droplets-gas mixing performance in depth adjustable underwater launcher cooling chamber

Liu

Xing

Zhao

2018

Engineering Computations

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Purpose The purpose of this study is to investigate structure parameters that influence the mixing process of droplets-gas in underwater depth-adjustable launcher cooling chamber and help engineers who design the launcher to distinguish the most important factor that impacts mixing performance in the cooling chamber. Design/methodology/approach Euler–Lagrangian droplet tracking method was used to simulate droplets-gas mixing process in the cooling chamber. The SST k-w model was adopted to simulate turbulence. Droplet breakup was described by KHRT hybrid model using modified contains which are more fit to the supersonic main flow condition. Findings The results show the counter-rotating vortex pairs which caused by injected liquid accelerate the mixing process. High-pressure supersonic freestream makes the liquid jet break into more small droplets due to the high momentum of the main stream. Axial injection angle has the greatest influence on Sauter mean diameter (SMD). Penetration height, SMD and total pressure loss slightly change in different tangential injection conditions. However, mixedness decreases with reduction of tangential injection angle due to a more limited space for spray developing. Enlarging orifice diameter raises penetration and mixedness greatly, while SMD and total pressure loss increase slightly. Originality/value The findings of this study confirm the key structure parameter to improve mixing performance in the cooling chamber. Engineers who design the underwater depth-adjustable launcher can refer the findings in this study to make control of launching power more accurate.

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Section: Resultssupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Numerical investigation of droplets-gas mixing performance in depth adjustable underwater launcher cooling chamber

Liu

Xing

Zhao

2018

Engineering Computations

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“…Similar observations were made for cylindrical liquid jets by Li and Kelly (1992), Lin (1992a, 1992b), Lian and Reitz (1993) and Chen and Li (1999). The stability of liquid jets in a compressible gaseous medium was also studied by a number of other investigators (Sherman and Schetz 1971, Baranovsky and Schetz 1980, Funada et al 2006. They found that the gas Mach number has a significant influence on the instability and breakup of liquid jets.…”

Section: Introductionmentioning

confidence: 99%

Influence of liquid and gas compressibility on the growth of waves in thin liquid sheets

Tharakan

Ramamurthi

2010

Fluid Dyn. Res.

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The growth of waves along the direction of motion of viscous compressible liquid sheets in inviscid compressible gas streams was investigated. Gas streams were considered to move at different velocities relative to the liquid sheet. A dispersion relation was derived for the spatial growth of longitudinal waves in the presence of lateral wave modes. The solution of the dispersion relation showed that the incorporation of gas compressibility increases the growth of paraantisymmetric waves. Compressibility in liquid, such as obtained by the dispersion of gas bubbles, has a much lower influence on the growth of paraantisymmetric waves. The presence of lateral wave modes did not influence longitudinal wave growth when the compressibility of liquid and gas was considered in the model.

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“…The breakup of a liquid jet in a supersonic crossflow has been of interest to many researchers for over 50 years. [1,2,3] Understanding the liquid atomization process is essential for predicting the appropriate time and length scales of the primary and secondary atomization processes to better model fuel and air mixing in combustion processes. As a result, numerous groups have attempted experimental measurements and computation modelling of the liquid jet breakup process when injected into a supersonic crossflow.…”

Section: Introductionmentioning

confidence: 99%

“…Preliminary studies began with experimental measurements to predict spray penetration depth via backlit and shadowgraph techniques [1,3] and small injector diameter tests allowed for size predictions of shedding droplets off the expanding jet. [2] Sauter mean diameter (SMD) of the droplets on the edge of the plume were also measured using holography and shadowgraphy [4], and phase Doppler particle analysis (PDPA) [5], with discrepancies greater than 300% in results between the studies. In all these studies, liquid properties, injector angle, and aeration of the liquid prior to injection were all evaluated to present a variety of breakup conditions.…”

Section: Introductionmentioning

confidence: 99%

Characterization of the steady and unsteady spray structures of a liquid jet in supersonic crossflow

Obenauf

Braun

Meyer

et al. 2021

ICLASS

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Characterization of the spray resulting from a 1 mm diameter liquid ethanol jet injection into a supersonic air crossflow is presented. The isentropic Mach number at the injection location is 1.94, while the momentum flux ratio is varied between 3 and 13. Steady and unsteady components of the penetration depth are retrieved using backlit imaging perpendicular to the spray at a frame rate of 20 kHz, coupled with a telecentric lens to accommodate the test section's width and ensure equal magnification through the spray's width. Spray width at specific axial locations downstream of injection is measured by imaging Mie scattered light from a planar laser sheet directed perpendicular to the flow direction so that a cross section of the spray is recorded by a camera placed at a known angle between camera axis and flow direction.

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Breakup of liquid sheets and jets in a supersonic gas stream

Cited by 49 publications

References 9 publications

Numerical investigation of droplets-gas mixing performance in depth adjustable underwater launcher cooling chamber

Numerical investigation of droplets-gas mixing performance in depth adjustable underwater launcher cooling chamber

Influence of liquid and gas compressibility on the growth of waves in thin liquid sheets

Characterization of the steady and unsteady spray structures of a liquid jet in supersonic crossflow

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