국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	High Altitude Performance Tests of Perfect ZrO2/Ni FGM Chamber
저자	Yukio KURODA, Masahiro SATO, Makoto TADANO, Shin-ichi MORIYA, Kazuo KUSAKA, Tatsuo KUMAGAI, Akio MORO, Hideyuki TAGUCHI, Yoshihiro KAWAMATA, Yoichiro MIKI, Nobuyuki SHIMODA
Keyword	ZrO2/Ni; Chamber; FGM; Reusable; Engine; HAPT; Bipropellant
URL	http://send.nal.go.jp/send/jpn/dlpdf.php3/naltr0001327.pdf?id=NALTR0001327
보고서번호	NAL TR-1327
발행년도	1997,5
출처	NAL (National Aerospace Laboratory of Japan)
ABSTRACT	Ceramic thermal barrier coating systems will be of growing importance for the reusable high performance orbitiong maneuvering engine(OME).These coatings have been previously studied for many years aiming to improve the resistance to extreme conditions ofo the large difference in thermal coefficient of expansion between the coating materials and the metal wall and the low ductility of the ceramic coating,cracks occur in the ceramic coating layer or spalling occurs during repiated thermal cycles.One method of improving adhesion of the coating to the metal wall is to apply FGM.In this test series,high altitude performance tests(HAPT)of regeneratively cooled 1200N thrust engine composed of ZrO2/Ni FGM chambers were conducted with nitrogen tetroxide/monomethyl hydrazine(NTO-MMH)bipropellant.To enhance the engine performance,we employed the high performance unlike quadlet element injector.The film cooling fraction was reduced to zero percent of the total fuel flow rate to obtain high performance.The combustion chamber used in HAPT was composed of perfect ZrO2/Ni FGM,i.e.,the chamber inner wall was made of ZrO2-8％Y2O3(8YSZ:100vol％),the cooling wall side was made of pure Ni and intermediate material were ZrO2/Ni FGM.The method of applying perfect FGM is to spray 8Z mixed with NiCoCrAlY onto a mandrel and electro-form onto the sprayed 8YSZ(24.5vol％)/NiCoCrAlY(75.5vol％)FGM layer.We believe that this reversed process of composing perfect FGM will provide an improved ceramic-metal bond between the sprayed FGM layer and electro-formed FGM layer.This series of tests was initiated at Kakuda Research Center(KRC)to evaluate the real engine performance and to study the effect of FGM coatings on thrust chamber life.A total of 50 firing tests including sea level tests were performed to evaluate the engine performance in terms of vacuum specific impulse(Ispv),and also obtain chamber thermal data.The high performance of the engine,i.e.,Ispv=318s at Pc=1.4MPa,was verified.This paper also presents the preliminary design concept of FGM,used for the thrust chamber,which prolongs thrust chamber life.