Jet to freestream velocity ratio computations for a jet in a crossflow

Margason, R. J.; Tso, Jin

doi:10.2514/6.1993-4860

Cited by 6 publications

(11 citation statements)

References 2 publications

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“…At this point, a detailed quantitative description of the flowfield was not available either experimentally or analytically. However there was a broad agreement about the jet cross section shape, appropriate correlation parameter and jet path [91].…”

Section: Early Research 1923-1970mentioning

confidence: 90%

“…Variations of the JICF include the jet in a cross flow in ground-effect and cases where there is no freestream velocity; hover out of groundeffect and hover in ground-effect. Specific applications where the JICF represents the primary flowfield feature include plume dispersion, gas turbine combustor cooling, turbofan thrust reversers, turbine cooling, turbojet thrust vectoring, reaction control for missiles and aircraft, and many variants associated with vertical and/or short take off/landing aircraft in transition flight both in and out of ground-effect [91].…”

Section: Fields Of Applicationmentioning

confidence: 99%

“…The combustion efficiency of such engines depends strongly on the liquid jet penetration depth, atomization and the consequent mixing between the atomized fuel and the free stream air. Thrust vector controlling of missiles and transpiration cooling of the thermal protection system of space vehicles are other typical applications of liquid injection into hypersonic crossflow [91,16,30]. …”

Section: Fields Of Applicationmentioning

confidence: 99%

“…The historical development of the investigation performed on JICF are presented in three different periods in the following sections: a) the early work up to 1970, b) experimental mean flowfield investigations and refinement of empiricism in potential flow based methods of calculation until about 1980, and c) recent experimental investigations which begin to provide more detailed data needed to validate contemporary computational fluid dynamic computations [91].…”

Section: Historical Elementsmentioning

confidence: 99%

“…While contour plots are probably the most convenient form for data comparisons, there are some errors which affect the interpretation of these plots. Generally, the C p contour locations become less definite as the C p gradient approaches zero which is where C p tends to zero away from the jet [91].…”

Section: Research During 1970'smentioning

confidence: 99%

See 4 more Smart Citations

Experimental Investigation of Liquid Fragmentation In Hypersonic Crossflow

Asma

Masutti

Chazot

2009

27th AIAA Applied Aerodynamics Conference

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Section: Early Research 1923-1970mentioning

confidence: 90%

Section: Fields Of Applicationmentioning

confidence: 99%

Section: Fields Of Applicationmentioning

confidence: 99%

Section: Historical Elementsmentioning

confidence: 99%

Section: Research During 1970'smentioning

confidence: 99%

See 3 more Smart Citations

Experimental Investigation of Liquid Fragmentation In Hypersonic Crossflow

Asma

Masutti

Chazot

2009

27th AIAA Applied Aerodynamics Conference

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Mixing of Jets in Cross Flow after Double Rows of Radial Injections

Nirmolo¹,

Woche

Specht

2008

Chem Eng & Technol

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Multiple rows of jets injected into a cross flow with diameters of 0.3 to 3 m were studied experimentally and numerically. The measured values were in good agreement with CFD calculations. The optimum mixing for a single row was obtained at a normalized momentum flux ratio (J/n 2 ) of 0.3 with a penetration depth (h/R) of 0.6, which is in accordance with previous studies. This condition is valid for all numbers of nozzles. However, increasing the number of nozzles will also improve the mixing quality. Double rows with a staggered arrangement always give a worse mixing quality, compared to a single row. Double rows with an inline arrangement will improve the mixing quality only if the injected volumetric flows produce over-and under-penetrated jets for a V : jo1 /V : jo2 ratio of 3/1 or 1/3. For operation under ever changing conditions a single row with J/n 2 > 0.3 and n ≥ 24 is recommended.

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Seeding optimization for instantaneous volumetric velocimetry. Application to a jet in crossflow

Cambonie

Aider

2014

Optics and Lasers in Engineering

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Every volumetric velocimetry measurements based on tracer (particles, bubbles, etc.) detection can be strongly influenced by the optical screening phenomenon. It has to be taken into account when the the statistical properties associated to the performances of the particle detection and tracking algorithms are significantly affected. It leads to a maximum concentration of particles in the images thus limiting the final spatial resolution of the instantaneous three-dimensional three-components (3D3C) velocity fields. A volumetric velocimetry system based on Defocused Digital Particle Image Velocimetry (DDPIV), named Volumetric 3-Components Velocimetry (V3V), is used to show that above a critical visual concentration of particles in the images, the concentration and accuracy of the final instantaneous raw velocity vector field drop. The critical concentration depends on physical parameters as well as on the processing algorithms. Three distinct regimes are identified. In the first regime, the concentration is well adapted to volumetric velocimetry, the largest concentration being optimal to maximize the number of valid velocity vectors. In the second regime, the performances of the detection and tracking algorithms are no longer optimal. Finally, the third regime is strongly influenced by optical screening. A rigorous methodology is proposed to optimize volumetric measurements taking into account the system specifications (pixel size, focal length, system magnification, etc.). An optimal particle concentration of 4.5×10 −2 particles.pixel −1 (ppp) is found. A relationship between the imaged concentration and the optimal final spatial resolution for fully interpolated instantaneous velocity field is obtained.The present study can be used as a guideline to achieve the measurement of instantaneous three-dimensional velocity fields with a good spatial resolution. It is finally successfully applied to a complex 3D flow test case: a jet in cross-flow.

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Jet to freestream velocity ratio computations for a jet in a crossflow

Cited by 6 publications

References 2 publications

Experimental Investigation of Liquid Fragmentation In Hypersonic Crossflow

Experimental Investigation of Liquid Fragmentation In Hypersonic Crossflow

Mixing of Jets in Cross Flow after Double Rows of Radial Injections

Seeding optimization for instantaneous volumetric velocimetry. Application to a jet in crossflow

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