Presented By: Aerospace Engineering
AE Defense: Conjugate Analysis of Two-Dimensional Ablation and Pyrolysis in Rocket Nozzles
Aerospace Engineering PhD Candidate: Peter Scott, Dissertation Chair: Prof. Iain Boyd
The development of a methodology and computational framework for performing conjugate analyses of transient, two-dimensional ablation of pyrolyzing materials in rocket nozzle applications is presented. This new engineering methodology comprehensively incorporates aero-thermal-chemical processes relevant to nozzles and other high-temperature components, making it possible, for the first time, to rigorously capture the strong interactions and interdependencies that exist between the reacting flowfield and the ablating material. By basing thermal protection system engineering more firmly on first principles, improved analysis accuracy can be achieved.
This computational framework couples a multi-species, reacting flow solver to a two-dimensional material response solver. Five different treatments of the surface energy balance at the ablating wall, with increasing levels of fidelity, are investigated. The Integrated Equilibrium Surface Chemistry treatment computes the surface energy balance and recession rate directly from the diffusive fluxes at the ablating wall, without making transport coefficient or unity Lewis number assumptions, or requiring pre-computed surface thermochemistry tables. This method can inherently account for the effects that recession, wall temperature, blowing, and the presence of ablation product species in the boundary layer have on the flowfield and ablation response. As a result, improved agreement with experimental surface recession data is obtained.
Publications
Peer-Reviewed Journal Article:
Peter G. Cross and Iain D. Boyd, “Two-Dimensional Modeling of Ablation and Pyrolysis with Application to Rocket Nozzles,” Journal of Spacecraft and Rockets, 54(1):212–224, January–February 2017, doi:10.2514/1.A33656.
Conference Papers:
Peter G. Cross and Iain D. Boyd, “Reduced Reaction Mechanism for Rocket Nozzle Ablation Simulations,” 47th AIAA Thermophysics Conference, June 2017, doi:10.2514/6.2017-3682. AIAA 2017–3682.
Peter G. Cross and Iain D. Boyd, “Conjugate Analysis of Rocket Nozzle Ablation,” 47th AIAA Thermophysics Conference, June 2017, doi:10.2514/6.2017-3351. AIAA 2017–3351.
Peter G. Cross and Iain D. Boyd, “Two-Dimensional Modeling of Ablation and Pyrolysis with Application to Rocket Nozzles,” 46th AIAA Thermophysics Conference, June 2016, doi:10.2514/6.2016-3383. AIAA 2016–3383.
Presentations:
Peter G. Cross and Iain D. Boyd, “Conjugate Analyses of Ablation in Rocket Nozzles,” 9th Ablation Workshop, Bozeman, MT, August 2017.
Peter G. Cross and Iain D. Boyd, “Decoupled and Conjugate Analyses of Rocket Nozzle Ablation,” National Space & Missile Materials Symposium, Indian Wells, CA, June 2017.
Peter G. Cross and Iain D. Boyd, “Decoupled and Conjugate Analyses of Rocket Nozzle Ablation,” 8th Ablation Workshop, Tucson, AZ, October 2016.
Peter G. Cross and Iain D. Boyd, “Towards Conjugate Analysis of Rocket Nozzle Ablation,” 7th Ablation Workshop, Tullahoma, TN, October 2015.
This computational framework couples a multi-species, reacting flow solver to a two-dimensional material response solver. Five different treatments of the surface energy balance at the ablating wall, with increasing levels of fidelity, are investigated. The Integrated Equilibrium Surface Chemistry treatment computes the surface energy balance and recession rate directly from the diffusive fluxes at the ablating wall, without making transport coefficient or unity Lewis number assumptions, or requiring pre-computed surface thermochemistry tables. This method can inherently account for the effects that recession, wall temperature, blowing, and the presence of ablation product species in the boundary layer have on the flowfield and ablation response. As a result, improved agreement with experimental surface recession data is obtained.
Publications
Peer-Reviewed Journal Article:
Peter G. Cross and Iain D. Boyd, “Two-Dimensional Modeling of Ablation and Pyrolysis with Application to Rocket Nozzles,” Journal of Spacecraft and Rockets, 54(1):212–224, January–February 2017, doi:10.2514/1.A33656.
Conference Papers:
Peter G. Cross and Iain D. Boyd, “Reduced Reaction Mechanism for Rocket Nozzle Ablation Simulations,” 47th AIAA Thermophysics Conference, June 2017, doi:10.2514/6.2017-3682. AIAA 2017–3682.
Peter G. Cross and Iain D. Boyd, “Conjugate Analysis of Rocket Nozzle Ablation,” 47th AIAA Thermophysics Conference, June 2017, doi:10.2514/6.2017-3351. AIAA 2017–3351.
Peter G. Cross and Iain D. Boyd, “Two-Dimensional Modeling of Ablation and Pyrolysis with Application to Rocket Nozzles,” 46th AIAA Thermophysics Conference, June 2016, doi:10.2514/6.2016-3383. AIAA 2016–3383.
Presentations:
Peter G. Cross and Iain D. Boyd, “Conjugate Analyses of Ablation in Rocket Nozzles,” 9th Ablation Workshop, Bozeman, MT, August 2017.
Peter G. Cross and Iain D. Boyd, “Decoupled and Conjugate Analyses of Rocket Nozzle Ablation,” National Space & Missile Materials Symposium, Indian Wells, CA, June 2017.
Peter G. Cross and Iain D. Boyd, “Decoupled and Conjugate Analyses of Rocket Nozzle Ablation,” 8th Ablation Workshop, Tucson, AZ, October 2016.
Peter G. Cross and Iain D. Boyd, “Towards Conjugate Analysis of Rocket Nozzle Ablation,” 7th Ablation Workshop, Tullahoma, TN, October 2015.
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