Capability of two-dimensional Reynolds-averaged Navier—Stokes simulations for two-dimensional thrust vectoring nozzles

Kozić, Mirko; Ristić, Slаvicа

doi:10.1243/09544100jaero676

Cited by 5 publications

(6 citation statements)

References 7 publications

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“…In summary, most of the researches of flow separation problems in the nozzle have tested three numerical models of turbulences, Spalart-Allmaras (SA), SST, and k-ω [1,16,20].…”

Section: (B)mentioning

confidence: 99%

“…This prediction is directly linked to the choice of turbulence model. Kozic and Ristic [16] used a k-ω model and encountered great difficulties in using 2 nd order schemes, and the analysis of its results lead to the conclusion that the chosen model gives approximately good pressure distribution but not good enough prediction of the separation point position. Živković et al [1] has used SST model, and the analyses show that the chosen model provides good approximation of the pressure distribution and separation point.…”

Section: (B)mentioning

confidence: 99%

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Nozzle flow gas-dynamical properties under dome deflector thrust vector system effect

Boulahbal¹,

Momcilo²,

Rezgui³

2019

THERM SCI

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The paper discusses the gas-dynamical disturbances in the nozzle jet-flow, discovered by numerical simulations, caused by mechanical-shaped jet obstacles, immersed in the exit area of the nozzle flow for thrust vector control purposes. External profiled tab shaped as a dome deflector is used to disturb the flow in the exit area, which provides the comprehensive 3-D nozzle separated flow zones with different high gradients of flow stream parameters. Discovered complexity of the flow pattern in the 3-D nozzle separated zone is exploited by complex CFD simulations and used for the numerical calculations, implemented by FLUENT commercial code. Pressure and temperature distributions data along the nozzle walls, as well as on the deflector wall, are used to estimate induced lateral and thrust forces by pressure integral. Induced forces estimated by numerical simulations and hot gases nozzle tests are compared as relative efficiency values to prove the quality of numerical simulations. Numerical calculations are carried out in the nozzle, obstacle, and the gap flows showed good agreement to the calculated and measured induced forces. The main aim of the developed method is to establish an approved calculation tool to compare and choose thrust vector control possibilities based on tabs with different forms of immersion in the external jets.

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“…In summary, most of the researches of flow separation problems in the nozzle have tested three numerical models of turbulences, Spalart-Allmaras (SA), SST, and k-ω [1,16,20].…”

Section: (B)mentioning

confidence: 99%

Section: (B)mentioning

confidence: 99%

Nozzle flow gas-dynamical properties under dome deflector thrust vector system effect

Boulahbal¹,

Momcilo²,

Rezgui³

2019

THERM SCI

View full text Add to dashboard Cite

show abstract

“…Environmental harshness, particularly vibrations, the lack of an optical table, temporal flow instability, and high fluid density gradients leading to complex interference patterns often make the quantitative evaluation of interferometric data very difficult and cumbersome. This is why the use of brute force interferogram analysis [43] or capturing interferograms for qualitative analysis and flow visualization in wind tunnels is still common [22,[44][45][46][47][48][49].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Supersonic Compressible Fluid Flow Using High-Speed Interferometry

Psota

Çubreli

Hála

et al. 2021

Sensors

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This paper presents a very effective interference technique for the sensing and researching of compressible fluid flow in a wind tunnel facility. The developed technique is very sensitive and accurate, yet easy to use under conditions typical for aerodynamic labs, and will be used for the nonintrusive investigation of flutter in blade cascades. The interferometer employs a high-speed camera, fiber optics, and available “of-the-shelf” optics and optomechanics. The construction of the interferometer together with the fiber optics ensures the high compactness and portability of the system. Moreover, single-shot quantitative data processing based on introducing a spatial carrier frequency and Fourier analysis allows for almost real-time quantitative processing. As a validation case, the interferometric system was successfully applied in the research of supersonic compressible fluid discharge from a narrow channel in a wind tunnel. Density distributions were quantitatively analyzed with the spatial resolution of about 50 μm. The results of the measurement revealed important features of the flow pattern. Moreover, the measurement results were compared with Computational Fluid Dynamics (CFD) simulations with a good agreement.

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“…These damages do not take effect individually, but in mutual interaction. Fracture, which is a most severe form of material damage, is under influence of numerous factors, such as: mechanical stresses, temperature, composition and properties of atmosphere, shapes and dimensions of a part or construction; structure and properties of material and quality of surface [1][2][3][4][5]. In order to determine the cause of fracture, in this paper, the specimens of new screws, unbroken used and screws that were broken during the exploitation were tested.…”

Section: Introductionmentioning

confidence: 99%

“…The numerical methods are the primary tool today in engineering analysis and simulation. These are used in all branches of science and technology for simulation of flow, in the field of various construction fluid mechanics, aerodynamics, hydrodynamics, and thermodynamics, and combustion, multiphase flow, in pharmacy, chemical industry, thermal power plants, and sports and so on [2][3][4]. Today in the world, there is a wide range of software for the numerical simulation.…”

Section: Introductionmentioning

confidence: 99%

Determination and Analysis of the Dynamic Loaded Screws by Structural Analysis, Fractography and Numerical Simulation

Kutin¹,

Prokolab²,

Ristić³

et al. 2013

AMR

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This paper analysis the causes dynamically loaded screws failure, using the structural analysis of mechanical properties and numerical simulation. The comparison with the new unbroken screws, which were not in use, has been done to determine the condition of the broken (dynamically loaded) ones. Analysis was performed, according to the following test methods and activities: non-destructive testing, visual inspection, radiographic testing, chemical analysis of screws sample materials, mechanical properties of screws' materials. Structure analysis of screws materials: Testing macrostructure (light optical microscope, SEM-EDS) examination of the microstructure (light optical microscope, SEM-EDS), fractographic examination. Numerical simulation of the stress state of the dynamically loaded screws was done in CATIA software package, and it was identical to the bolt loads, during service exploitation. The results between numerical simulation and structural analysis were quite coinciding - the difference is about 8-10%, which is pretty good for these types of experiments. Such an overlap, says that the stress value at the very screws is reliable and give us a true picture of loadings. Structural mechanical tests have shown a very pronounced effect of dynamic loads, that large shear stress shows also as a good agreement, where between the stresses, obtained by numerical simulation and structural mechanical testing. Analysing the results, obtained by numerical simulation and structural mechanical testing were performed with the redistribution of critical stresses, and proposal for the structure optimization. The comparative analysis methods have been provided the precise prediction of fracture appearance and made possible to define the preventive measures.

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Capability of two-dimensional Reynolds-averaged Navier—Stokes simulations for two-dimensional thrust vectoring nozzles

Cited by 5 publications

References 7 publications

Nozzle flow gas-dynamical properties under dome deflector thrust vector system effect

Nozzle flow gas-dynamical properties under dome deflector thrust vector system effect

Characterization of Supersonic Compressible Fluid Flow Using High-Speed Interferometry

Determination and Analysis of the Dynamic Loaded Screws by Structural Analysis, Fractography and Numerical Simulation

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