Validation of Transient Cooling Modeling for Hypersonic Application

Gascoin, Nicolas; Gillard, Philippe; Dufour, Emmanuel; Touré, Youssoufi

doi:10.2514/1.26022

Cited by 87 publications

(38 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A previous work [7] furnishes a chemical validation under stationary conditions as a validation of the transient thermal and hydraulic behaviour of RESPIRE. Good agreement is found on temperature, compared to the CFD software CFD-ACE (2-D heated tube with tabulated fluid) [6]. Thermal and hydraulic time evolutions are reasonable and quantitative results are adequate for a 1-D model, used as predimensioning tool.…”

Section: Equationsmentioning

confidence: 69%

“…A FTIR spectrometer NICOLET 6700 is available with a specific and innovative identification and quantification method of pyrolysis products under stationary and transient conditions to enable "real-time" and inline measures. The calibration of the FTIR instrument was performed with five products of pyrolysis which have already been analysed in former works (methane, ethene, ethane, propene and propane) [6]. The spectrometer is equipped with a DTGS detector, a KBr beamsplitter and a cell with a pathlength of 0.1 m. It is employed to obtain the absorption spectra every 15 seconds with 4 scans and with a resolution of 0.5 cm -1 .…”

Section: The Comparer Test Benchmentioning

confidence: 99%

“…It considers an existing detailed pyrolysis mechanism (1185 reactions, 153 species) [5] for the n-dodecane but it could treat other fluids with appropriate pyrolysis mechanism or with data tables giving the fluid properties [6]. The n-dodecane is used because of its purity and because it is representative of aeronautic kerosene.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Synthetic and jet fuels pyrolysis for cooling and combustion applications

Gascoin

Abraham

Gillard

2010

Journal of Analytical and Applied Pyrolysis

View full text Add to dashboard Cite

Large heat load are encountered in hypersonic flight applications due to the high vehicle speed (over Mach 5, i.e. 5000 km.h-1) and to the combustion heat release. If passive and ablative protections are a way to ensure the thermal management, the regenerative cooling is probably the most efficient one to enable the structures withstanding (notably for reusable structures). The present study is a part of COMPARER project (COntrol and Measure of PArameters in a REacting stReam) which aims at investigating the highly coupled phenomenon (heat and mass transfers, pyrolysis, combustion) in a cooling channel surrounding a SCRamjet combustion chamber and at proposing some parameters to enable the control of such a complex technology. In this paper, we present the comparative numerical pyrolysis study of some selected synthetic and jet fuels (heptane, decane, dodecane, kerosene surrogate). The fluid pyrolysis has been studied experimentally and the results of RESPIRE numerical simulation under lab and in-flight conditions are given with validation to provide a deep understanding of phenomenon. The impact of the density, of the critical parameters, of the viscosity and of the chemistry is investigated to analyze their effect on the cooling efficiency of the engine. That also enables to estimate which properties the best cooling fuel should have. Furthermore, a combustion study is conducted because the cooling fuel is the one that ensure the thrust. The RESPIRE code enables to conduct both coupled pyrolysis and combustion studies. A first approach of the dynamic regeneratively cooled SCRamjet is provided to get a large vision of the fuel nature impact on the system.

show abstract

Section: Equationsmentioning

confidence: 69%

Section: The Comparer Test Benchmentioning

confidence: 99%

See 1 more Smart Citation

Synthetic and jet fuels pyrolysis for cooling and combustion applications

Gascoin

Abraham

Gillard

2010

Journal of Analytical and Applied Pyrolysis

View full text Add to dashboard Cite

show abstract

“…A numerical tool, called RESPIRE (a French acronym for SCRamjet Cooling with Endothermic Fuel, Transient Reactor Programming) has been developed for the COMPARER project [50]. It uses a detailed pyrolysis mechanism (1185 reactions, 153 species) and it is adapted to stationary and transient studies under liquid, gas or supercritical conditions.…”

mentioning

confidence: 99%

Characterisation of coking activity during supercritical hydrocarbon pyrolysis

Gascoin¹,

Gillard²,

Bernard³

et al. 2008

Fuel Processing Technology

Self Cite

104

View full text Add to dashboard Cite

The active cooling of the Supersonic Combustion Ramjet engine, for hypersonic flight purpose, is ensured thanks to fuel, n-dodecane for the present study. The endothermic fuel pyrolysis, starting above 800 K, could generate an unwanted coke formation. Experimental tests up to 1125 K and between 1 MPa and 6 MPa have been performed on the hydrocarbon fuel pyrolysis to evaluate the coking activity. 316L stainless steel, low carbon steel and titanium reactors have been considered. A witness of the coke formation, based on its thermal insulation and pressure loss effects, has been found. A correlation between methane production and coke deposit was found. The coke has been studied with Scanning Electron Microscope (SEM), Energy Dispersion Spectroscopy (EDS), X-ray diffractometer and Fourier Transform Infrared (FTIR) spectroscopy. The porosity, the density and the permeability of the coke have been estimated.

show abstract

“…The equations that are present in the code are extensively detailed in previous work. 54,55 If using the MIRAGE code in full 1D configuration, a space step of 1 mm to 1 cm with adapted Courant-Friedrichs-Lewy condition is acceptable without degrading the accuracy of the results. This configuration presents the main interest to study the ignition location and multipoint ignition effects.…”

Section: Preliminary Workmentioning

confidence: 99%

Confined Kerosene Vapor Explosion: Severity Prediction Laws Based on Numerical Simulations.

Gascoin¹,

Gillard

2010

Energy Fuels

View full text Add to dashboard Cite

The vulnerability of aircraft, if attacked by conventional weapons, depends notably on the possibility to initiate and to propagate a combustion reaction in the multicompartmented kerosene tanks. After a review of the related mechanisms and existing studies, the numerical simulation tool MIRAGE (french acronym for gas flow adaptable and transient reactive modeling) is used extensively to investigate the effects of four parameters: the ignition energy (from 5 to 1000 J), the equivalence ratio in air (from 0.3 to 2.19), the tank pressure (from 1 to 1.8 bar absolute), and its volume (from 0.4 to 2 m 3 ). A detailed kinetic mechanism is considered (207 species, 1592 reactions) to properly represent the chemistry. The maximum pressure after explosion is found to depend mainly on the initial pressure and on the equivalence ratio, but not on the tank volume or the applied energy. A critical value of the energy, corresponding to the limit between ignition and no ignition, is shown depending on the equivalence ratio but also on the initial pressure of the tank. Thanks to these results of "numerical experiments", empirical laws are proposed to estimate the overpressure and its dynamic depending on the preceding four parameters. These laws are also applied to some test cases of the literature, with good agreement.

show abstract

Validation of Transient Cooling Modeling for Hypersonic Application

Cited by 87 publications

References 37 publications

Synthetic and jet fuels pyrolysis for cooling and combustion applications

Synthetic and jet fuels pyrolysis for cooling and combustion applications

Characterisation of coking activity during supercritical hydrocarbon pyrolysis

Confined Kerosene Vapor Explosion: Severity Prediction Laws Based on Numerical Simulations.

Contact Info

Product

Resources

About