Effect of Hot Spot Location on Flow Structure in Nozzle Guide Vane

Piotrowicz, Michal; Flaszyński, Paweł; Doerffer, Piotr

doi:10.1088/1742-6596/1101/1/012025

Cited by 2 publications

(2 citation statements)

References 6 publications

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“…Furthermore, Gaussian (single-mode) and round (multi-mode) laser beams are distinguished by a similar radial temperature distribution, as seen in nozzles [45], where heat is delivered uniformly. Spatial distribution, characteristic of a Gaussian profile, however, offers an increase in the maximum temperature, although the energy conversion rate is on average comparable.…”

Section: Discussionmentioning

confidence: 93%

Investigations of Energy Conversion and Surface Effect for Laser-Illuminated Gold Nanorod Platforms

Radomski,

Zaccagnini,

Ziółkowski

et al. 2024

Energies

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Achieving a quick temperature increase is a burning issue for biophysical applications, like germ inactivation and tumor ablation, and for energy performances, like solar collectors and steam generators. Based on the plasmon resonance phenomenon, noble metallic nanoparticles have emerged as promising weapons due to their very high biocompatibility, optical properties, and high surface-to-volume ratio, increasing energy conversion and allowing the maximum temperature to be reached faster. This work examines the energy conversion in sandwiched glassy platforms with gold nanorods. The platforms are kept vertically in the air and illuminated by a 0.5 W near-infrared laser (808 nm). To describe this aspect theoretically, the size and conversion efficiency of the electromagnetic properties are compromised between the proposed model and the stability of the nanorods. As a research approach, our model of cross-sections and polarizability for the surface effect is proposed, coupled with classical CFD numerical calculations. The results of the proposed model, validated by a thermal camera and spectroscopy measurements, indicate that as long as the energy conversion is visible with relatively low-power lasers (ΔT = 18.5 °C), the platforms do not offer fast heat dissipation. The results indicate that, despite the flow forcing by the air inflow, the entropy generation due to heat conduction is more than three orders higher than the dynamic entropy production. Flow forcing corresponds to the value of the velocity for classical convective motions. Therefore, the delivered heat flux must be distributed via convective transport or the associated high-conductive materials.

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Section: Discussionmentioning

confidence: 93%

Investigations of Energy Conversion and Surface Effect for Laser-Illuminated Gold Nanorod Platforms

Radomski,

Zaccagnini,

Ziółkowski

et al. 2024

Energies

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“…The interaction of the combustion chamber with a turbine located downstream is a very important subject for engine manufacturers. Thus, several studies have already been made on various configurations, in particular in order to understand the effects of a hot spot migration in the turbine [12][13][14]. For the FACTOR configuration, many LES of the isolated or integrated chamber with the downstream turbine are already available in the literature [15][16][17][18][19][20][21].…”

Section: Combustion Chamber/turbine Integrated Simulationmentioning

confidence: 99%

Generation of Realistic Boundary Conditions at the Combustion Chamber/Turbine Interface Using Large-Eddy Simulation

et al. 2021

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Numerical simulation of multiple components in turbomachinery applications is very CPU-demanding but remains necessary in the majority of cases to capture the proper coupling and a reliable flow prediction. During a design phase, the cost of simulation is, however, an important criterion which often defines the numerical methods to be used. In this context, the use of realistic boundary conditions capable of accurately reproducing the coupling between components is of great interest. With this in mind, this paper presents a method able to generate more realistic boundary conditions for isolated turbine large-eddy simulation (LES) while exploiting an available integrated combustion chamber/turbine LES. The unsteady boundary conditions to be used at the inflow of the isolated turbine LES are built from the modal decomposition of the database recorded at the interface between the two components of the integrated LES simulation. Given the reference LES database, the reconstructed field boundary conditions can then be compared to standard boundary conditions in the case of isolated turbine configuration flow predictions to illustrate the impact. The results demonstrate the capacity of this type of conditions to reproduce the coupling between the combustion chamber and the turbine when standard conditions cannot. The aerothermal predictions of the blade are, in particular, very satisfactory, which constitutes an important criterion for the adoption of such a method during a design phase.

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Effect of Hot Spot Location on Flow Structure in Nozzle Guide Vane

Cited by 2 publications

References 6 publications

Investigations of Energy Conversion and Surface Effect for Laser-Illuminated Gold Nanorod Platforms

Investigations of Energy Conversion and Surface Effect for Laser-Illuminated Gold Nanorod Platforms

Generation of Realistic Boundary Conditions at the Combustion Chamber/Turbine Interface Using Large-Eddy Simulation

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