Simulation of Carbon-Carbon Crack Growth Due to Carbon Oxidation in High Temperatures

摘要

High-temperature gas-dynamic computational techniques are employed to study microflows in expanding cracknchannels caused by the oxidation of the channel carbon walls. Wall regression rates for three reinforced carbon–ncarbon samples that were tested in a high-enthalpy arcjet environment were modeled. The test geometries and flownconditions span flowregimes fromthe transitional through the continuum, but the samemechanismforwallmaterialnloss, atomic oxygen reaction with bare carbon, was used in all three cases. Kinetic (direct simulation Monte Carlo)nand continuum(Navier–Stokes) gas-dynamic approaches were used. The predicted wall regression rates were foundnto agree with arcjetmeasurements, and the general specimen shape change was predicted. Local gas flowfield resultsnwere found to affect the oxidation rate in amanner that cannot be predicted by previous mass loss correlations. Thenmethod holds promise for future modeling of materials gas-dynamic interactions for hypersonic flight.