Conjugate Analysis of Silica-Phenolic Charring Ablation Coupled with Interior Ballistics

Date

2021-07-01

Author

Alanyalioglu, Cetin Ozan
Özyörük, Yusuf

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Because of its excellent insulation capability, the usage of a silica-phenolic charring ablator as a nozzle liner is a common practice in the solid rocket motor industry. During the design of a solid rocket motor employing a silica-phenolic nozzle liner, it is desired to conduct an accurate analysis yielding in-depth thermal response and recession characteristics. As the interior ballistics and nozzle recession rate mutually interact, the best practice is to perform a coupled solution to both. Commonly used one-dimensional analysis tools with empirical approaches for estimation of convective heat transfer rate and blowing effect generally lack sought accuracy and do not model the transient shape-change phenomenon, which affects the nozzle performance. This Paper considers governing equations for charring, including pyrolysis gas injection and surface energy balance for melting ablation, along with a boundary condition governed by interior ballistics, and demonstrates a framework in which these equations are solved with governing equations for the nozzle flowfield in a coupled manner. Development and validation of a one-dimensional material response solver based on the same governing equations is also demonstrated. Also, results from a static firing test conducted with a small-scale ballistic evaluation motor employing a silica-phenolic nozzle insert are provided. Results from both investigations are compared and discussed.

URI

https://hdl.handle.net/11511/91610

Journal

JOURNAL OF PROPULSION AND POWER

DOI

https://doi.org/10.2514/1.b37839

Collections

Department of Aerospace Engineering, Article

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Citation Formats

C. O. Alanyalioglu and Y. Özyörük, “Conjugate Analysis of Silica-Phenolic Charring Ablation Coupled with Interior Ballistics,” JOURNAL OF PROPULSION AND POWER, pp. 528–543, 2021, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/91610.