Normalized Spray Flux Distribution in Impinging Atomization

Inoue, Chihiro; Kouwa, Junya; Watanabe, Toshinori; Himeno, Takehiro; Uzawa, Seiji; Matsuno, Shinsuke

doi:10.2322/tjsass.60.255

Cited by 3 publications

(2 citation statements)

References 8 publications

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“…The agreement between the coldflow test and combustion test also indicates that the effect of confinement by the chamber wall on c is not statistically significant. The results of cold-flow test slightly overestimate the results of combustion test, because the cold-flow test doesn't consider the heat loss dissipated to the large heat capacity of the uncooled chamber wall in the combustion test [26]. We can roughly estimate that the nonimplementation of film-cooling fuel deteriorates c up to 10% by heat loss (see Appendix B), consistent with the discrepancy between the cold-flow test and combustion test in case 1.…”

Section: A Characteristic Velocitysupporting

confidence: 51%

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Direct Formulation of Bipropellant Thruster Performance for Quantitative Cold-Flow Diagnostic

Inoue¹,

Oishi²,

Daimon³

et al. 2021

Journal of Propulsion and Power

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Section: A Characteristic Velocitysupporting

confidence: 51%

“…Fig. 6 Top and side views of the three-dimensional-printed patternator [26], with the lower part of each section connected to a tube leading to the test tube downstream. measurement results of the propellant mass flow rate, combustion pressure, and throat area.…”

Section: Resultsmentioning

confidence: 99%

Direct Formulation of Bipropellant Thruster Performance for Quantitative Cold-Flow Diagnostic

Inoue¹,

Oishi²,

Daimon³

et al. 2021

Journal of Propulsion and Power

Self Cite

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Experimental Investigation of Unlike Triplet Sprays Using High-Magnification Shadowgraphy: Influence of the Jets Velocities and Central Jet Properties

2023

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In this study, inert liquid sprays are generated by impinging two symmetric jets of water with a central jet of water, ethanol, or n-dodecane. This configuration, referred to as an unlike triplet injector, can be used in rocket engines to atomize liquid storable propellants, for instance, hydrogen peroxide oxidizer combined to a fuel. Here, the inert sprays are investigated in the so-called impact waves regime, which corresponds to jets a Weber number of higher than 1000. The atomization process is characterized using high-magnification shadowgraphy (HMS) from the impinging point of the jets into a sheet until it breaks up into ligaments and droplets. The HMS technique enables 10 kHz visualizations with an interframe of 4 μs and a spatial resolution up to 6.4 μm/pixel (1024 × 1024 pixels). Characteristic lengths of the primary atomization are measured: breakup length, apparent wavelength, and ligaments size. Similarly, the droplet populations are described based on arithmetic and Sauter mean diameters, shape, and velocity. Statistics of large droplet distributions are analyzed regarding the injection conditions and distance to the impingement point. Compared to like-doublet spray, the like-triplet evidences a slower atomization (longer breakup distance) and generates larger drops that require more distance to stabilize in size, centricity, and velocity. Unlike-triplet sprays exhibit a similar behavior to like-triplet spray while producing larger droplets, probably because of the fuel properties that stabilize the liquid sheet.

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