An ablation model based on finite-rate heterogeneous reactions is incorporated into a conjugate flowfield/ablation analysis framework, relaxing the assumption of equilibrium ablation made in previous studies using this conjugate analysis methodology. Fully coupled, conjugate, two-dimensional simulations modeling the ablation of pyrolyzing carbon–phenolic material in the HIPPO nozzle test case are presented; comparisons are made between equilibrium and finite-rate surface chemistry assumptions. The finite-rate surface chemistry method provides substantially improved agreement with experimental measurements. The difference in the surface recession predictions obtained with the equilibrium and finite-rate models is larger than expected. This suggests that finite-rate surface chemistry effects may be important for temperatures above the 2000–2500 K threshold that is typically assumed for equilibrium surface chemistry. Additional studies investigate the effects of finite-rate gas-phase reactions and radiative heat transfer on the predicted ablation response.
Coupled Simulations of Finite-Rate Ablation with Pyrolysis in Rocket Nozzles
Journal of Thermophysics and Heat Transfer ; 34 , 2 ; 381-392
2019-12-18
12 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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