Computational Analyses of Pressurization in Cryogenic Tanks

Ahuja, Vineet; Hosangadi, Ashvin; Mattick, Stephen J.; Lee, Chun P.; Field, Robert E.; Ryan, H. M.

doi:10.2514/6.2008-4752

Cited by 13 publications

(9 citation statements)

References 11 publications

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“…where Ψ is given by (10). Given the uniform heat fluxq w the local temperature at the wall surface can be found from…”

Section: Discussionmentioning

confidence: 99%

“…The temperature stratification effects under consideration may be responsible for the possible appearance of the overheated layers [11,12] of cryogenic fuel in the external tanks, and would be crucial to designing effective pressure and temperature control in the storage tanks [7][8][9][10]13]. The model is meant to be applied towards treating very important aspects of cryogenic fuel management technology [13], such as the minimization of the boil-off effects and the optimization of fuel bias, i.e.…”

mentioning

confidence: 99%

“…However, the above model, allowing for a fairly adequate description of the ET ullage history [1,2], does not account for a substantial temperature stratification that may happen [3][4][5][6] in both the ullage [7][8][9][10] and the liquid [9,10] control volumes of the external and storage cryogenic tanks. The major goal of the present paper is to develop a model that correctly describes possible thermal stratification in both the ullage and liquid bulk parts of a tank that is based on ordinary differential equations, similar to those discussed in [1], short of a fullscale computational fluid dynamics (CFD) modeling scheme [3][4][5][6][7][8], so that it can be implemented efficiently and used for online state estimation, fault diagnosis, and fault prognosis.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Temperature Stratification in a Cryogenic Fuel Tank

Daigle

Smelyanskiy

Boschee

et al. 2013

Journal of Thermophysics and Heat Transfer

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A reduced dynamical model describing temperature stratification effects driven by natural convection in a liquid hydrogen cryogenic fuel tank has been developed. It accounts for cryogenic propellant loading, storage, and unloading in the conditions of normal, increased, and micro-gravity. The model involves multiple horizontal control volumes in both liquid and ullage spaces. Temperature and velocity boundary layers at the tank walls are taken into account by using correlation relations. Heat exchange involving the tank wall is considered by means of the lumped-parameter method. By employing basic conservation laws, the model takes into consideration the major multi-phase mass and

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“…where Ψ is given by (10). Given the uniform heat fluxq w the local temperature at the wall surface can be found from…”

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Temperature Stratification in a Cryogenic Fuel Tank

Daigle

Smelyanskiy

Boschee

et al. 2013

Journal of Thermophysics and Heat Transfer

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show abstract

“…An additional curve fit was used to compute the droplet temperature given its enthalpy. An alternative approach was also implemented to determine the enthalpy from the droplet"s temperature and pressure based on the HBMS equation of state 6 . However, this method required an iterative solution to find the droplet"s temperature given its enthalpy rendering it more computationally expensive.…”

Section: B Droplet Enthalpy-temperature Relationmentioning

confidence: 99%

Analysis of Flame Deflector Spray Nozzles in Rocket Engine Test Stands

Sachdev¹,

Ahuja²,

Hosangadi³

et al. 2010

46th AIAA/ASME/SAE/ASEE Joint Propulsion Conference &Amp;amp; Exhibit

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The development of a unified tightly coupled multi-phase computational framework is described for the analysis and design of cooling spray nozzle configurations on the flame deflector in rocket engine test stands. An Eulerian formulation is used to model the disperse phase and is coupled to the gas-phase equations through momentum and heat transfer as well as phase change. The phase change formulation is modeled according to a modified form of the Hertz-Knudsen equation. Various simple test cases are presented to verify the validity of the numerical framework. The ability of the methodology to accurately predict the temperature load on the flame deflector is demonstrated though application to an actual sub-scale test facility. The CFD simulation was able to reproduce the result of the test-firing, showing that the spray nozzle configuration provided insufficient amount of cooling.

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“…A variety of thermodynamic models of varying complexity and fidelity are available to define the properties of generalized mixtures. 5 In the present study, the thermodynamic properties were specified by modeling the mixture as an ideal one where the properties of each phase were combined in a linear manner based on the mass fractions of each component. The code has been validated and applied to a wide range of problems including some that are of relevance to the present study.…”

mentioning

confidence: 99%

Simulation of Propellant Explosions Resulting from Crew Launch Vehicle Tank Failure

Hosangadi

Madavan

2008

26th AIAA Applied Aerodynamics Conference

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Detailed assessments of the potential risk and impact of various failure scenarios are being performed as part of the design evolution process for NASA's Ares I crew launch vehicle (CLV). This paper assesses a specific failure resulting from a catastrophic disintegration during ascent of the CLV liquid propellant tank and the subsequent release of the bulk propellants into the atmosphere. The goal of the assessment is to determine the time scales of the various processes and the strength and propagation of the blast wave if the mixture ignites. Since the overall flow scenario is very complex, the problem is modeled in a series of building blocks that progresses towards a comprehensive model. The results presented in this paper indicate that an appropriately located ignition source can initiate sustained combustion and lead to the formation of a fireball with high temperatures and high pressures.

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Computational Analyses of Pressurization in Cryogenic Tanks

Cited by 13 publications

References 11 publications

Temperature Stratification in a Cryogenic Fuel Tank

Temperature Stratification in a Cryogenic Fuel Tank

Analysis of Flame Deflector Spray Nozzles in Rocket Engine Test Stands

Simulation of Propellant Explosions Resulting from Crew Launch Vehicle Tank Failure

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