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과산화수소 하이브리드 로켓을 위한 접촉점화성 고체연료의 점화 특성
정준영(Junyeong Jeong),Vikas Khandu Bhosale,권세진(Sejin Kwon) 한국추진공학회 2019 한국추진공학회 학술대회논문집 Vol.2019 No.5
접촉점화성 하이브리드 로켓은 산화제가 고체연료에 직접 분사되어 접촉 점화되는 시스템을 가지고 있어 시스템이 간단하고 신뢰성이 높으며 응답성이 뛰어나다는 장점이 있다. 하지만 신뢰성있는 점화성능을 확보하기 위해 일정하고 짧은 점화지연을 가지는 연료를 제작하는 것이 중요하다. 본 연구에서는 95 wt% 과산화수소 기반 하이브리드 로켓을 위한 접촉점화성 고체연료를 제작, 검증하였다. 파라핀왁스 기반 접촉점화성 고체연료의 제작 공정을 수립하고, 환원제의 종류, 농도, 그리고 첨가제의 종류에 따른 점화성능에 대해 연구하였다. Hypergolic hybrid rocket has a system in which the oxidizer is injected directly into the solid fuel and ignited at the same time, so its system is very simple and reliable. However, it is important to fabricate hypergolic fuel with constant and short ignition delay to ensure the reliable ignition performance. In this study, hypergolic solid fuels for 95 wt% hydrogen peroxide based hybrid rocket were fabricated and evaluated. The manufacturing process of paraffin wax based hypergolic solid fuel was established and the ignition characteristics according to the type and concentration of the reducing agents was studied. In addition, change of the ignition characteristics according to the additives was studied.
Yun, Junyeong,Song, Changhoon,Lee, Hanchan,Park, Heun,Jeong, Yu Ra,Kim, Jung Wook,Jin, Sang Woo,Oh, Seung Yun,Sun, Lianfang,Zi, Goangseup,Ha, Jeong Sook Elsevier 2018 Nano energy Vol.49 No.-
<P><B>Abstract</B></P> <P>The aim of this paper is to report on the fabrication of a stretchable array of high-performance solid-state micro-supercapacitors (MSCs), which can be charged with integrated, commercial Si-based solar cells (SCs). This would facilitate the powering of an integrated strain sensor. The planar MSCs comprised electrodes of potentiostatically deposited polypyrrole, on spray-coated multi-walled carbon nanotube film, and a gel-type electrolyte of LiCl/polyvinyl alcohol with a redox additive of 1-methyl-3-propylimidazolium iodide. The fabricated MSC achieved an areal capacitance of 5.17 mF cm<SUP>−2</SUP>. After 5000 charge/discharge cycles, the MSC retained 80% of their initial capacitance. A strain sensor was fabricated utilizing a composite film of fragmentized graphene foam and polydimethylsiloxane. Such fabricated twelve parallel connected MSCs, a strain sensor, and SCs were integrated on a single deformable polymer substrate with embedded stiff platforms of negative epoxy series resist (SU-8) via long serpentine interconnections of polyimide encapsulated Ti/Pt metal film for mechanical stability under stretching. After 1000 repetitive biaxial stretching/releasing cycles by 30%, no noticeable change was observed in the charge/discharge behavior of the MSC array. Furthermore, both the photo-charge/discharge characteristics and electrochemical performance remained stable. When the whole integrated system was attached to the wrist, the integrated strain sensor could detect both externally applied strain and the arterial pulse using the energy stored in the MSCs from the SCs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We fabricate a stretchable array of micro-supercapacitors charged by solar cells for wireless powering of the integrated strain sensor. </LI> <LI> Serpentine interconnections with the embedded stiff SU-8 platform enable stable performance under stretching deformation. </LI> <LI> Strain sensor detects pulse signal of the radial artery and bending motion of the wrist. </LI> <LI> The sensor is operated for 100 s with energy supplied by the integrated array. </LI> <LI> Under repeated biaxial stretching, the stretchable array retains stable performance. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>