Characterization of Cryogenic Injection at Supercritical Pressure

Branam, Richard; Mayer, W.

doi:10.2514/2.6138

Cited by 89 publications

(54 citation statements)

References 11 publications

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“…However, only a few sets of quantitative experimental data have been made public compared with data on incompressible variable-density jets [7]. To the best of the authors£ knowledge, Raman-scattering-based density pro¦les of transcritical nitrogen jets are the only quantitative data that have been published [1,8]. These pro¦les showed that the spatial growth rate of transcritical jets agrees with those predicted by the theoretical equations and measurements for incompressible variable-density turbulent jets.…”

Section: Introductionmentioning

confidence: 59%

Temperature measurement of cryogenic nitrogen jets at supercritical pressure

Tani

Teramoto

Toki

et al. 2016

Progress in Propulsion Physics

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The temperatures of transcritical and supercritical nitrogen jets were measured to explore the in §uence of ¤pseudovaporization¥ upon cryogenic propellant mixing in high-pressure rocket chambers. Pseudovaporization is the large thermodynamic transition near the pseudocritical temperature under transcritical conditions, which can include a drastic density change and large peak of isobaric speci¦c heat. A decline in the rise of temperature along the jet centerline of the transcritical jet was caused at the position where the local temperature reached nearpseudocritical temperature. This can be considered to be due to the large peak of isobaric speci¦c heat. The density jump appeared near the pseudocritical temperature, which can be correlated to the sudden expansion due to pseudovaporization. The axial pro¦les of the temperature and density of the supercritical jet monotonically increased and decreased, respectively, in the downstream region of the end of the jet potential core. Similar to the axial pro¦les, the radial pro¦les of the temperature were in §uenced by the pseudovaporization ¡ i. e., the temperature rise in the radial direction became very shallow in the region where the local temperature was still lower than the pseudocritical temperature. The full width at half maximum of the density pro¦les stayed almost constant further downstream of the end of the jet potential core, whereas that of the mass fraction pro¦les of the incompressible variable-density jet began to increase near the end of the potential core. Hence, the evolutions of jet mixing layers of transcritical jets and variable-density jets can be considered to di¨er due to pseudovaporization. NOMENCLATURE SymbolsD inner diameter of injector, 2 mm h speci¦c enthalpy

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Section: Introductionmentioning

confidence: 59%

Temperature measurement of cryogenic nitrogen jets at supercritical pressure

Tani

Teramoto

Toki

et al. 2016

Progress in Propulsion Physics

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“…However, the authors of [3,36] discuss that despite using sophisticated methods, they had problems to determine the exact temperature at the nitrogen in §ow. Also, the measurement data were recorded in a transient phase in which the feeding lines did not have the same temperature as the injected §uid.…”

Section: In §Uence Of the Equation Of Statementioning

confidence: 99%

“…The testing chamber is a cylindrical tank (D c = 122 mm) and is initially ¦lled with nitrogen at ambient temperature. While the chamber front wall has been assumed to be adiabatic, the outer walls have been kept at a constant temperature of 298 K. More details on the experimental setup are given in [36].…”

Section: Computational Setupmentioning

confidence: 99%

Large-eddy simulation of trans- and supercritical injection

Müller

Niedermeier

Jarczyk

et al. 2016

Progress in Propulsion Physics

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In a joint e¨ort to develop a robust numerical tool for the simulation of injection, mixing, and combustion in liquid rocket engines at high pressure, a real-gas thermodynamics model has been implemented into two computational §uid dynamics (CFD) codes, the density-based INCA and a pressure-based version of OpenFOAM. As a part of the validation process, both codes have been used to perform large-eddy simulations (LES) of trans-and supercritical nitrogen injection. Despite the di¨erent code architecture and the di¨erent subgrid scale turbulence modeling strategy, both codes yield similar results. The agreement with the available experimental data is good.

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“…The con¦guration for the numerical simulation is the experimental setup [9,10]. It consists of a single round jet (2.2 mm in diameter) injected in a cylindrical chamber (122 mm in diameter) pressurized at 39.7 bar at a temperature of 298 K (Fig.…”

Section: Flow Configurationmentioning

confidence: 99%

“…To the authors£ knowledge, the studies by Zong et al [16,17], who simulated highpressure round jets from AFRL experiments, are the only unstationary analyses of a three-dimensional (3D) nonreactive cryogenic round jet at high Reynolds number. RCM-1 test case has been simulated using Reynolds-averaged Navier Stokes (RANS) approach by Branam and Mayer [9] and Cheng and Farmer [21]. The aim of the current study was to describe the destabilization processes for a nitrogen jet under SC conditions.…”

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confidence: 99%