Modeling of solid-liquid circulation in the National Aerospace Plane's slush hydrogen tanks

Navickas, J.; Cady, E. C.; Flaska, T. L.

doi:10.2514/6.1988-2824

Cited by 3 publications

(9 citation statements)

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“…Moreover, when the pipe diameter increases, the solid hydrogen degradation decreases and this is due to the decrease in friction losses. Navickas et al (1989) conducted numerical studies to estimate the liquid thermal stratification caused by buoyancy effects. This approach is based on a two-phase flow analysis in which one set of equations is provided for each phase.…”

Section: Nomenclaturementioning

confidence: 99%

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Prognosis and Numerical Analysis of the Pressure Drop in Slush Hydrogen Vacuum-Jacketed Transfer Lines

Hatem

Zakhia

Zeghondy

et al. 2016

Interfac Phenom Heat Transfer

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Hydrogen offers high combustion qualities and therefore is chosen as a propellant for the national aerospace plane (NASP). The low density of hydrogen is a major inconvenience; therefore, a solid-liquid mixture called SLUSH hydrogen is used to increase the density and cooling capacity. In this paper, a two-phase mixture is modeled using separated flow model in which the mathematical equations are written separately for each phase where different properties and velocities are considered for each phase. Mass, momentum, energy equations, and interfacial phenomena equations are developed with the inclusion of drag force, virtual mass force, mass and momentum transfer, and interfacial shear stress. turbulence effects are treated and multiparticle drag correlations are used. Results for pressure drop across a 1.5 in. Schedule 5S vacuum-jacketed pipe show good agreement comparing it with earlier experimental data and numerical analysis.

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Section: Nomenclaturementioning

confidence: 99%

“…where C D is the drag coefficient, V r is the relative velocity as V r = V s − V l and A proj is the projected area per unit volume of a typical solid particle and is given by Navickas et al (1989)…”

Section: Interfacial Drag Forcementioning

confidence: 99%

Prognosis and Numerical Analysis of the Pressure Drop in Slush Hydrogen Vacuum-Jacketed Transfer Lines

Hatem

Zakhia

Zeghondy

et al. 2016

Interfac Phenom Heat Transfer

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“…Slush flows have not been the matter of many numerical and modelling studies in the literature. If the first experimental studies performed to freeze hydrogen properties were performed in the sixties [12][13], the first studies reporting on numerical activities for slush date back to the late eighties [14][15] and the first review [16] on the state of the art for slush hydrogen production and utilisation has been published only in 1994.…”

Section: Literature Reviewmentioning

confidence: 99%

“…Most of the studies on slush modelling have been done in the USA in the frame of the National Aerospace Plane (NASP) projects. They have been carried out with commercial CFD software: MicroCompact [17], FLOW3D [14][15]18] and PHOENICS [19]. The study performed by Zakhia [19] was focused on the calculation of flow dynamics of slush hydrogen in transfer ducts, while others [14][15]17] were investigating the stratification in slush hydrogen propellant tanks.…”

Section: Nasa Nasp Projectmentioning

confidence: 99%

“…This was also the case in the paper of Sasmal et al [18] where little details were provided on the modelling used with the solver FLOW3D to investigate the influence of heat-transfer rates on pressurization of liquid/slush hydrogen propellant tanks. Two other studies were also performed, using FLOW3D by Navickas et al [14][15], for estimating the liquid thermal stratification caused by buoyancy effects. FLOW3D was modified for this activity.…”

Section: Nasa Nasp Projectmentioning

confidence: 99%

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Review of the Modelling of Slush Hydrogen Flows

Reynier¹,

Bugel²,

Lecointre

2011

The Journal of Computational Multiphase Flows

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In the perspective of mass savings related to future launchers, the use of slush hydrogen as propellant is attractive. Due to its higher density, the use of slush hydrogen could lead to the mass reduction of propellant and the utilisation of smaller tanks. However, the use of slush hydrogen in rocket engines presents different challenges. The first one is the production of slush hydrogen. Other aspects are the problems induced by the use of slush in a propulsion system: slush flow in pipes and singularities, design of a compatible turbopump and injection of slush in a combustion chamber. In order to prepare numerical tools for supporting future technical activities, ISA has undertaken a large effort in the direction of the modelling of slush hydrogen flows. The work has been split in two parts: the engineering modelling for slush flows in pipe lines and the preparation of more advanced models. At first, an extensive review of the available studies on this topic reported in the literature has been undertaken. Then, an engineering model has been selected and incorporated in a numerical tool. The different issues in term of modelling related to slush hydrogen have been identified and a potential model for future computational fluid dynamics calculations has been selected.

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