Simulation and analysis of the jet flow patterns from supersonic nozzles of laser cutting using OpenFOAM

Darwish, Mohamed; Orazi, Leonardo; Angeli, Diego

doi:10.1007/s00170-019-03346-5

Cited by 19 publications

(10 citation statements)

References 15 publications

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“…The gas-assisted laser cutting flow was simulated using the model developed in [22]. The compressible flow through the proposed nozzles (SNA, SNB, and SNC) is governed by the Reynolds-Averaged Navier-Stokes (RANS) equations, where all of the unsteadiness is averaged out and Like most commercial nozzles, the nozzles were designed with straight walls due to their easy manufacturing, while the exit divergence angle (θ e ) was initially set equal to 30 • for SNA and 10 • for both SNB and SNC [27].…”

Section: Numerical Model and Simulation Resultsmentioning

confidence: 99%

“…The gas-assisted laser cutting flow was simulated using the model developed in [22]. The compressible flow through the proposed nozzles (SNA, SNB, and SNC) is governed by the Reynolds-Averaged Navier-Stokes (RANS) equations, where all of the unsteadiness is averaged out and regarded as part of the turbulence, together with two additional turbulence equations (k-ε).…”

Section: Numerical Model and Simulation Resultsmentioning

confidence: 99%

“…The comparative analysis of the achieved cutting quality was conducted operating under the exact-design condition specified for each supersonic nozzle, and under a fixed stagnation pressure of 20 bar, indicated as the optimal condition for the reference conical nozzle by prior experiments. This choice can be supported considering that the gas-assisted laser cutting flow shows optimum dynamic characteristics under the exact-design condition-calculated for each nozzle-so that optimal cutting quality can be obtained under these different operating settings [22,23].…”

Section: Methodsmentioning

confidence: 99%

“…Moreover, the exit jet from the supersonic nozzle in the free stream has been numerically studied to illustrate the behavior of the exit jet pattern under various operating conditions [20][21][22]. Zhang et al [20] numerically modeled and visualized the exit jet patterns from two supersonic nozzles, a Minimum Length Nozzle (MLN) designed according to the Method of Characteristics (MOC) and an identical commercial supersonic nozzle with straight walls diverging by 5 • .…”

Section: Introductionmentioning

confidence: 99%

“…Other authors in [21] investigated the gas-assisted laser cutting flow through a supersonic nozzle operated at high pressure under various operating conditions (desired-design, over-expansion, and under-expansion). The achieved results have been further investigated and accurately simulated by means of an efficient model developed by the authors of the current work [22]; the same model was used to simulate the exit jet behavior from the nozzles proposed in this article under various operating stagnation pressures [23].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Investigation on the Inert Gas-Assisted Laser Cutting Performances and Quality Using Supersonic Nozzles

Orazi

Darwish

Reggiani

2019

Metals

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In the present work, three different supersonic nozzles were designed and manufactured to operate at various stagnation pressures during laser cutting. Several cutting experiments were performed on stainless steel samples of various thicknesses (2, 4, 6 mm) using a fiber laser of 3 kW with a head adapted to fit with both the proposed supersonic nozzles and a commercial reference conical nozzle. The flow through these nozzles was numerically modeled and compared with the Schlieren visualization measurements. The mass flow rate, the Mach number, and the pressure distributions were selected in detail in order to analyze the dynamic characteristics of the exit jet and to comparatively assess the achieved cutting quality (roughness perpendicularity) and capability (maximum thickness, cutting speed). The numerical and the experimental results were found to be in high agreement in terms of the flow structure and mass flow rate. In addition, a significant reduction of the assistance gas consumption of up to 65% on average was achieved by using supersonic nozzles as opposed to conical ones, accompanied with the decrease of the operating pressure and the increase of the cutting speed.

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Section: Numerical Model and Simulation Resultsmentioning

confidence: 99%

“…The gas-assisted laser cutting flow was simulated using the model developed in [22]. The compressible flow through the proposed nozzles (SNA, SNB, and SNC) is governed by the Reynolds-Averaged Navier-Stokes (RANS) equations, where all of the unsteadiness is averaged out and regarded as part of the turbulence, together with two additional turbulence equations (k-ε).…”

Section: Numerical Model and Simulation Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Investigation on the Inert Gas-Assisted Laser Cutting Performances and Quality Using Supersonic Nozzles

Orazi

Darwish

Reggiani

2019

Metals

Self Cite

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Modeling and analysis of the visualized gas-assisted laser cutting flow from both conical and supersonic nozzles

Darwish

Mrňa

Orazi

et al. 2020

Int J Adv Manuf Technol

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Parametrical investigation for the optimization of spherical jet-stirred reactors design using large eddy simulations

et al. 2021

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Due to the importance of gas-phase chemical reaction kinetics in low-emission combustion, stirred tank reactors have been used for decades as an experimental tool to study high- and low-temperature oxidation. A Jet-Stirred Reactor (JSR) setup is valuable to determine the evolution of species mole fractions. For the accuracy of the experimental results, it is important that a JSR is designed such that the concentration field is as homogeneous as possible in order to avoid disturbance of the chemical kinetics. In this work, numerical simulations were performed to investigate the mixing in a JSR chamber. The turbulent structures inside the JSR and the nozzles are captured using Large Eddy Simulations. We conducted numerically a parametric study to evaluate the effects of thermodynamic conditions and geometrical parameters on the mixing characteristics. More specifically, the diameter of the spherical chamber is modified together with the diameter of the nozzles through which fresh gases are fed. The characterization of the gas flow inside a typical spherical JSR layout and results derived by the normalized standard deviation of a tracer mass fraction show that a reduction of the JSR diameter at high pressures improves the homogeneity. Further, we propose a new optimized configuration consisting of six nozzles pointing to the center of the reactor which provides a more uniform composition compared to the standard JSR design.

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Simulation and analysis of the jet flow patterns from supersonic nozzles of laser cutting using OpenFOAM

Cited by 19 publications

References 15 publications

Investigation on the Inert Gas-Assisted Laser Cutting Performances and Quality Using Supersonic Nozzles

Investigation on the Inert Gas-Assisted Laser Cutting Performances and Quality Using Supersonic Nozzles

Modeling and analysis of the visualized gas-assisted laser cutting flow from both conical and supersonic nozzles

Parametrical investigation for the optimization of spherical jet-stirred reactors design using large eddy simulations

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