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

Date

2021-07-01

Author

Alanyalioglu, Cetin Ozan
Özyörük, Yusuf

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

208
views

0
downloads

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

Suggestions

OpenMETU
Core

CONJUGATE HEAT TRANSFER ANALYSIS OF INTERNALLY COOLED TURBINE BLADE Gorgulu, Ilhan; Gumusel, Baris; Akmandor, I. Sinan (2012-06-15) There are different characters of air flow in a conventional gas turbine blade cooling channel. These flow characters; including high streamline curvature caused from 180 degree bends, sequential flow separations caused from rib turbulators and pin-fin structures are analyzed separately with available commercial software for different turbulence models and validated against reliable experimental data from open literature. Also coupled conjugate heat transfer analyses on NASA C3X vane, which has only radial ...
A process modeling approach for micro drilling of aerospace alloys with a waterjet guided laser system Subasi, Levent; Gökler, Mustafa İlhan; Yaman, Ulaş (2022-04-01) Laser drilling is a preferred method to make cooling holes on gas turbine parts. Although it is a fast process, there are some quality issues. Waterjet guided laser (WJGL) is a hybrid process, in which a laser beam is coupled with and guided through thin cylindrical waterjet. Pressurized water in this novel process provides focusing, cooling and cleaning of the machining zone, eliminating undesired side effects of the laser. The process can be conveniently used for micro drilling operations on aerospace jet...
Numerical simulation of charring ablation coupled with computational fluid dynamics Alanyalıoğlu, Çetin Ozan.; Özyörük, Yusuf; Department of Aerospace Engineering (2019) Usage of charring ablators as nozzle liners is a common practice in the field of solid rocket motor industry. Among them, silica-phenolic is a commonly employed material due to its excellent insulation capability. During the design of a solid propellant rocket motor employing silica-phenolic as a nozzle liner, it is desired to have an accurate thermal analysis along with throat recession rate estimation, as the interior ballistics of a solid rocket motor is tightly coupled with throat diameter. This work pr...
The impact of biofuel properties on emissions and performances of a micro gas turbine using combustion vibrations detection Allouis, Christophe Gerard; Amoresano, A.; Capasso, R.; Langella, G.; Niola, V; Quaremba, G. (2018-10-01) The use of pure vegetable oils in Micro Gas Turbine can damage the injection system or the combustion chamber causing undesired vibrations. An ideal solution would consist in having an available tool able to forecast and/or follow in real time the vibrational state of the combustion device. The present paper describes tests performed on a low emission Micro Gas Turbine for power generation, fueled with different liquid fuels, including commercial diesel oil and its blends with pure rapeseed oil. A particula...
A hydrodynamic model developed for the condensate flowing over a sinusoidal fluted tube Gökçe, Hüseyin; Özgen, Canan (Elsevier BV, 1987-9) Fluted tubes which were designed by Gregorig considering the use of surface tension forces are commonly used in evaporators and condensers for desalination purposes. In this study the surface profile of a fluted tube, which cannot be described by any conventional coordinate system is obtained numerically by using an intrinsic-coordinate system. Navier-Stokes equations are solved after some simplifications for the condensate flowing over the sinusoidal fluted profile to find the volumetric flow rate. The res...

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.