Effects of combustion on the near-wall turbulence and performance for supersonic hydrogen film cooling using large eddy simulation

Jun, Wei; Zhang, Silong; Zuo, Jingying; Qin, Jiang; Zhang, Junlong; Bao, Wen

doi:10.1063/5.0139355

Cited by 20 publications

(2 citation statements)

References 69 publications

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“…The LES turbulence model assumed here is relatively mature and widely used. 41 Turbulence is an extremely complex and unsteady phenomenon, and the flow field is full of vortex structures of varying sizes. The large-scale vortices contain almost all the turbulent kinetic energy, whereas the small-scale vortices dissipate kinetic energy.…”

Section: Large Eddy Simulationmentioning

confidence: 99%

Atomization of liquid pulsed jet in subsonic crossflow

Chang

Chen

et al. 2023

AIP Advances

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Pulsed jet is an effective solution to improve fuel jet penetration depth and consequently increase the mixing efficiency of gas–liquid in conventional combustion chambers. This has the benefits of reducing pollutant emissions and diminishing the instability of fuel combustion. However, the atomization process of pulsed jets with small amplitude has still not been properly investigated. This paper studies such a process through Large Eddy Simulation and a Coupled Level Set and Volume of Fluid method. We investigate the atomization process in a liquid pulsed jet with a subsonic crossflow and the impact of the Strouhal number on atomization morphology and the behavior of the pulsed jet in general. Results show that, with a constant mass flow rate, the role of Rayleigh–Taylor instability is replaced by the periodic fluctuation of the jet velocity, which ends up dominating the primary process of atomization of the liquid transverse pulsed jet. This also improves atomization, in general, and the fragmentation of the jet. We also show that the Strouhal number significantly impacts the penetration depth of the jet, with high values increasing penetration by up to 12%.

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Section: Large Eddy Simulationmentioning

confidence: 99%

Atomization of liquid pulsed jet in subsonic crossflow

Chang

Chen

et al. 2023

AIP Advances

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“…There are many flame measurement aspects in gas turbines [1], combustors [2], engine combustion chambers [3,4], and other devices, including the density [5], temperature [6], and composition [2] fields. Commonly used methods include physical measurement and optical measurement methods.…”

Section: Introductionmentioning

confidence: 99%

Reconstruction Method of 3D Turbulent Flames by Background-Oriented Schlieren Tomography and Analysis of Time Asynchrony

Gao,

Zhang,

et al. 2023

Fire

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Background-oriented Schlieren tomography (BOST) is widely used for 3D reconstruction of turbulent flames. Two major concerns are associated with 3D reconstruction. One is the time asynchrony within the data acquisition of the high-speed camera. The other is that the ray tracing process requires significant computational consumption. This study proposes a ray tracing optimization method based on the k-d tree. The study results show that the average search nodes for each ray are only 0.018% of 3D flame with 3.07 million grid nodes. In addition, a parameter estimation method of the unknown azimuth power spectrum function is proposed. First, a typical Sandia turbulent jet diffusion flame dataset was built and validated accordingly, with experiments. The algorithm’s applicability to the 3D reconstruction of temperature and density fields is discussed on this basis. The root-mean-square error (RMSE) of the cross-section density for 3D reconstruction is below 0.1 kg/m3. In addition, the RMSE of the cross-section temperature is below 270 K. Finally, an uncertainty analysis of the flame reconstruction based on a physical model is performed by optimizing the ray tracing method. For the time asynchronous variance of 1 ms, the density uncertainty of the 3D reconstruction is below 1.6 × 10−2 kg/m3, and the temperature uncertainty is below 70 K. The method can provide an essential basis for the design of BOST systems and the 3D reconstruction of turbulent flames.

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