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Title: Atomization and dense-fluid breakup regimes in liquid rocket engines

Journal Article · · Journal of Propulsion and Power
DOI:https://doi.org/10.2514/1.B35562· OSTI ID:1237373
 [1];  [1]
  1. Sandia National Lab. (SNL-CA), Livermore, CA (United States)

Until recently, modern theory has lacked a fundamentally based model to predict the operating pressures where classical sprays transition to dense-fluid mixing with diminished surface tension. In this paper, such a model is presented to quantify this transition for liquid-oxygen–hydrogen and n-decane–gaseous-oxygen injection processes. The analysis reveals that respective molecular interfaces break down not necessarily because of vanishing surface tension forces but instead because of the combination of broadened interfaces and a reduction in mean free molecular path. When this occurs, the interfacial structure itself enters the continuum regime, where transport processes rather than intermolecular forces dominate. Using this model, regime diagrams for the respective systems are constructed that show the range of operating pressures and temperatures where this transition occurs. The analysis also reveals the conditions where classical spray dynamics persists even at high supercritical pressures. As a result, it demonstrates that, depending on the composition and temperature of the injected fluids, the injection process can exhibit either classical spray atomization, dense-fluid diffusion-dominated mixing, or supercritical mixing phenomena at chamber pressures encountered in state-of-the-art liquid rocket engines.

Research Organization:
Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Sponsoring Organization:
USDOE Office of Under Secretary for Science (S-4)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1237373
Report Number(s):
SAND-2015-1156J; 567064
Journal Information:
Journal of Propulsion and Power, Vol. 31, Issue 5; ISSN 0748-4658
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 13 works
Citation information provided by
Web of Science

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Cited By (7)

Study on instability of circular liquid jets at subcritical to supercritical conditions using dynamic mode decomposition journal January 2020
Large Eddy Simulation of a Supercritical Fuel Jet in Cross Flow using GPU-Acceleration conference January 2016
High Fidelity Large Eddy Simulation of Reacting Supercritical Fuel Jet-in-Cross-Flow using GPU acceleration conference July 2016
Understanding the breakdown of classic two-phase theory and spray atomization at engine-relevant conditions journal April 2016
Transition of subcritical liquid jets in single and multicomponent systems journal October 2018
Large-Eddy Simulation of Coaxial LN2/GH2 Injection at Trans- and Supercritical Conditions journal January 2016
Large-Eddy Simulation of Coaxial LN2/GH2 Injection at Trans- and Supercritical Conditions conference January 2015

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