Droplet size distributions in cryogenic flash atomization

Loureiro, Daniel Dias; Kronenburg, A.; Reutzsch, Jonathan; Vogiatzaki, Konstantina

doi:10.1016/j.ijmultiphaseflow.2021.103705

Cited by 10 publications

(7 citation statements)

References 39 publications

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“…In addition, RANS simulations featuring the full injection process of the flow through the injector and in the combustion chamber have been realized. Details on the numerics have been published in previous work [10,11,15,17,27,28]. The key results are:…”

Section: Discussionmentioning

confidence: 99%

“…The DNS results will need to be exploited to develop and implement a suitable source term for the surface area transport equation that accounts for the specific characteristics of flash atomization. Dietzel et al [10] provide the surface area specific growth rates as functions of local (LES-filtered) pressures and the DNS by Loureiro et al [27] provide surface generation terms due to the dynamics of the breakup process.…”

Section: Discussionmentioning

confidence: 99%

“…Further analysis of the DNS (not shown here) provides an evolution for the surface area of the interface between liquid and vapour phase. Loureiro et al [27] observed that (i) surface density is largely determined by bubble density (i.e. nucleation rate) and Weber number and (ii) stays relatively constant after the majority of bubbles have started to coalesce as surface creation by ligament pinching and surface destruction by ligament contraction seem to balance.…”

Section: Droplet Size Distributionmentioning

confidence: 99%

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Modelling and Simulation of Flash Evaporation of Cryogenic Liquids

Gärtner

Loureiro

Kronenburg

2022

Fluid Mechanics and Its Applications

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Rocket engine manufacturers attempt to replace toxic, hypergolic fuels by less toxic substances such as cryogenic hydrogen and oxygen. Such components will be superheated when injected into the combustion chamber prior to ignition. The liquids will flash evaporate and subsequent mixing will be crucial for a successful ignition of the engine. We now conduct a series of DNS and RANS-type simulations to better understand this mixing process including microscopic processes such as bubble growth, bubble-bubble interactions, spray breakup dynamics and the resulting droplet size distribution. Full scale RANS simulations provide further insight into effects associated with flow dynamic such as shock formation behind the injector outlet. Capturing these gas dynamic effects is important, as they affect the spray morphology and droplet movements.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Droplet Size Distributionmentioning

confidence: 99%

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Modelling and Simulation of Flash Evaporation of Cryogenic Liquids

Gärtner

Loureiro

Kronenburg

2022

Fluid Mechanics and Its Applications

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“…For this a detailed phenomenological understanding of bubble growth and bubble-bubble interactions and their effect on spray breakup, droplet dynamics and subsequent mixing processes is needed. Complementary to the experimental studies in SP-B4, DNS [5,6,26] and RANS [10] simulations were conducted in SP-B5 (see Gärtner et al in this volume). RANS simulations were also performed for the overall process to investigate fluid dynamic effects and shock wave formation downstream of the injector [10].…”

Section: Flash Evaporation Of Cryogenic Liquids Under Near-vacuum Con...mentioning

confidence: 99%

“…RANS simulations were also performed for the overall process to investigate fluid dynamic effects and shock wave formation downstream of the injector [10]. Figure 12 shows an example of the temporal devel- opment of the spray break-up process and droplet generation for selected boundary conditions [26]. As an important result for this aspect, it was found that only bubbles close to the jet surface grow significantly.…”

Section: Flash Evaporation Of Cryogenic Liquids Under Near-vacuum Con...mentioning

confidence: 99%

Collaborative Research on Droplet Dynamics Under Extreme Ambient Conditions

Schulte

Dreizler

Munz

et al. 2022

Fluid Mechanics and Its Applications

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A fundamental understanding of droplet dynamics is important for the prediction and optimization of technical systems involving drops and sprays. The Collaborative Research Center (CRC) SFB-TRR 75 was established in January 2010 to focus on the dynamics of basic drop processes, and in particular on processes involving extreme ambient conditions, for example near thermodynamic critical conditions, at very low temperatures, under the influence of strong electric fields, or in situations involving extreme gradients of the boundary conditions. The goal of the CRC was to gain a profound physical understanding of the essential processes, which is the basis for new analytical and numerical descriptions as well as for improved predictive capabilities. This joint initiative involved scientists at the University of Stuttgart, the TU Darmstadt, the TU Berlin, and the German Aerospace Center (DLR) in Lampoldshausen. This first chapter provides a brief overview of the overall structure of this CRC as well as a summary of some selected scientific achievements of the subprojects involved. For further details the reader is referred to the subsequent chapters of this book related to the individual subprojects.

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