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International Journal of Energetic Materials and Chemical Propulsion
ESCI SJR: 0.149 SNIP: 0.16 CiteScore™: 0.29

ISSN 印刷: 2150-766X
ISSN オンライン: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.v4.i1-6.820
pages 885-895

DETERMINATION OF TEMPERATURE AND OH CONCENTRATION PROFILES OF RDX/CAB PSEUDO PROPELLANTS USING UV/VISIBLE ABSORPTION SPECTROSCOPY

Abdullah Ulas
Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, PA 16802, USA
Yeu-Cherng Lu
Mechanical Engineering Department, The Pennsylvania State University, University Park, PA 16802

要約

In this paper, burning rates, temperature and OH concentration profiles of pure RDX and pseudo propellants containing RDX with CAB binder having 8, 11, and 14 percent by weight were determined. UV/Visible absorption spectroscopy was used as the diagnostic technique to determine the gas-phase temperature and OH species concentration profiles. The deduced final flame temperatures from absorption measurements are 3062 K for pure RDX, 2990 K for RDX/CAB (92/8%), 2806 K for RDX/CAB (89/11%), and 2742 K for RDX/CAB (86/14%) at 0.45 MPa. In order to examine the pressure dependency of final flame temperatures and OH mole fractions, absorption measurements were also conducted at 0.17 and 0.79 MPa for pure RDX. The results showed that pure RDX has a final flame temperature of around 2950 K at 0.17 MPa and 3220 K at 0.79 MPa. The deduced final flame temperatures are in good agreement with equilibrium calculations. The deduced OH concentrations from absorption measurements are lower than equilibrium calculations due to the non-one-dimensionality of the flame causing uncertainties in the effective pathlength of the light beam. During the tests, it was observed that there was no multistage flame structure for both pure RDX and pseudo propellants with RDX/CAB mixtures. Thermocouple measurements for pure RDX indicated that the surface temperature is about 600 K at 0.17 MPa and 675 K at 0.79 MPa.


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