Assessment of turbulence modeling for gas flow in two-dimensional convergent–divergent rocket nozzle

Balabel, Ashraf; Hegab, A.; Nasr, M.; El-Behery, Samy M.

doi:10.1016/j.apm.2011.01.013

Cited by 86 publications

(41 citation statements)

References 23 publications

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“…[21]. According to Balabel [22] it found that the numerical predictions using the SST-k-ω turbulence model show close agreement with the experimental measurements. In addition, it found by Bartosiewicza et al [21] that the RNG and SSTk-ω models are the best suited to predict the shock phase, strength, and the mean line of pressure recovery.…”

Section: Turbulence Modelingmentioning

confidence: 54%

“…The separation region formed downstream can be considered as consequence of the adverse pressure gradient through the shock, which forces the incoming boundary layer to separate. The oblique shock structures are of the weak type resulting in low supersonic flow downstream while the flow immediately past the Mach stem is subsonic as discussed as reported [22].…”

Section: Velocity Profilesmentioning

confidence: 92%

“…As the separation point becomes near the effective nozzle exit, the lambda shock system adjusted to satisfy continuity of pressure and flow direction. This trend is indicated by a slight increase of the shear stress near the nozzle exit as discussed in [22].…”

Section: Velocity Profilesmentioning

confidence: 97%

“…One can see clearly near the wall, the separation shock consists of incident and reflected oblique waves that merge into a Mach stem at the triple point. This is so-called lambda foot of the shock as discussed in [5,22].…”

Section: Velocity Profilesmentioning

confidence: 99%

See 3 more Smart Citations

Study of the Configuration and Performance of Air-Air Ejectors based on CFD Simulation

Am¹,

Mh²,

Zm³

et al. 2017

J Aeronaut Aerospace Eng

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This paper describes a numerical study of gas-gas ejector performance for different operating conditions and geometrical configurations. The performance of ejector obtained based on a simulation procedure of linearized and axisymmetric subsonic and supersonic flow using Fluent Package. A conventional finite-volume scheme utilized to solve two-dimensional transport equations with the standard k-ω SST turbulence model. The model is solved in three regions namely, the primary flow nozzle, the secondary flow channel, and the region of interaction between the supersonic nozzle jet and the secondary flow. The effect of gas motive pressure the mixing part and tail section (pipe or diffuser) geometry on the ejector performance are studied. The computational results are validated using published experimental data with acceptable agreements. The numerical results indicate that the ejector geometry has a pronounced effect on the flow parameters (i.e., pressure and gas velocity) and the ejector performance. In addition, predicted numerical results indicate that when the motive-stream velocity exceeds the speed of sound, shock waves are unavoidable inside ejectors and that shock wave pattern in mixing part has a dominant effect on ejector performance. In addition, the results indicate that the shock location inside the nozzle and the separation point are affected by the motive pressure. The results show also that configuration with convergent-divergent mixing section is much better for mixing process than the other tested configurations.

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Section: Turbulence Modelingmentioning

confidence: 54%

Section: Velocity Profilesmentioning

confidence: 92%

Section: Velocity Profilesmentioning

confidence: 97%

Section: Velocity Profilesmentioning

confidence: 99%

See 2 more Smart Citations

Study of the Configuration and Performance of Air-Air Ejectors based on CFD Simulation

Am¹,

Mh²,

Zm³

et al. 2017

J Aeronaut Aerospace Eng

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“…Coaxial devices have also been proposed: in the SEDS process (solution enhanced dispersion by supercritical fluids) a coaxial twin-fluid nozzle to co-introduce the SCF antisolvent and solution is used (Bałdyga et al, 2010;He et al, 2010;Mawson et al, 1997;Wena et al, 2010). Complex nozzles geometries have also been tested carrying out a comparative study of the nozzle by computational fluid dynamics (Balabel et al, 2011;Bouchard et al, 2008). Petit-Gas et al found that for the lowest capillary internal diameter studied, there were particles with differences morphologies according to the jet velocity.…”

Section: Parameters Influence On Hydrodynamicmentioning

confidence: 99%

Hydrodynamics Influence on Particles Formation Using SAS Process

Montes¹,

Tenorio²,

Gordillo³

et al. 2011

Hydrodynamics - Advanced Topics

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Amoxicillin and Ethyl Cellulose Precipitation by Two Supercritical Antisolvent Processes

Montes

Nunes²,

Gordillo

et al. 2013

Chem Eng & Technol

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Composites of amoxicillin and ethyl cellulose in the micrometer range were precipitated by supercritical antisolvent (SAS) processes using carbon dioxide as antisolvent and a mixture of dichloromethane and dimethylsulfoxide as solvents. Morphologies and mean diameter ranges were analyzed by scanning electron microscopy. X‐ray photoelectron spectroscopy (XPS) and high‐performance liquid chromatography were carried out in order to ensure successful coprecipitation and to determine the amoxicillin contents in the final products. The SAS processes used differ mainly in the way in which the solutions are introduced: through a normal or a coaxial nozzle. The XPS results provided proof that amoxicillin was not distributed in the same way in all the samples. The release behavior of the composites obtained was evaluated in two biological fluids, i.e., simulated gastric and simulated intestinal fluids. The different systems led to the release of the drug in different ways; but in all cases slower solubilization was obtained than for the pure drug.

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Assessment of turbulence modeling for gas flow in two-dimensional convergent–divergent rocket nozzle

Cited by 86 publications

References 23 publications

Study of the Configuration and Performance of Air-Air Ejectors based on CFD Simulation

Study of the Configuration and Performance of Air-Air Ejectors based on CFD Simulation

Hydrodynamics Influence on Particles Formation Using SAS Process

Amoxicillin and Ethyl Cellulose Precipitation by Two Supercritical Antisolvent Processes

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