In-situ Measurement For Ablation Geometry During Impinging Of Plume With Laser Triangulation Method | 66478
Journal of Material Sciences & Engineering
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In-situ ablation measurement of glass phenolic (G/P) composite during hot plume impinging was studied using laser triangular
method. G/P, a representative anti-ablative material has been studied for its application in aerospace, automobile, and defense area.
Especially, the ablation mechanism by aerodynamic heating has been well studied with various measurement methods for developing
accurate computational model. However, when G/P is required to resist impinging plume, such as plume resistance plate in vertical
launching system, different ablation behavior exhibits which demands another investigations for this mechanism and computational
model. Therefore, in-situ measurement method for proving mechanism and developing computation model of ablation with impinging
plume of high pressure and temperature is highly required. The G/P composite, a suitable material for resisting impinging plume from
rocket nozzle, was tested its ablative characteristic using small-scaled booster with 16% concentration of alumina particle. The plume
impinged vertically to material surface with about two seconds. During the test, real-time measurement of ablation geometry was
conducted with laser triangular method, using laser wavelength of 405 nm and laser intensity of 0.44 W. The laser spots were spread
on material surface by diffractive optical elements, and monitored using high-speed camera. The laser signal was distinguishable even
in the atmosphere of existing hot plume by installing optical filter, and the movement of laser spots during the test was monitored and
calculated to ablation rate. The transient section of combustion and radiation of hot plume occasionally shaded the laser, while the
highest precision level of real-time recession measurement confirmed. Moreover, the high accuracy of this method has been proved
via comparing with thermocouple signal and geometry scanning after the test. We believe this method, which firstly conducted with
highest accuracy and stability, showed its high potential for broaden research of anti-ablative materials.
Juhwan Lim has his expertise in carbon material, from nano-sized graphene to macro size carbon/carbon composite. He did his BS (2011) and MS (2013) in the Department of Mechanical Engineering from Yonsei University, Seoul, South Korea. His major field of study is synthesis, device fabrication, and optoelectrical property characterization of graphene, graphene oxide and relating nano-composites. Currently, he is a Researcher at the Agency for Defense Development. He has published 16 papers in international journal, including Journal of Physical Chemistry-C, Carbon, Journal of Materials Chemistry and Scientific Reports. Currently, his research also focuses on designing, testing and characterization of anti-ablation and thermal protection composite materials such as C/C, G/P and other FRP composites for applying it to advanced thermal protection system.