국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	STUDIES ON SCRAMJET NOZZLES (1) Performance of Two Dimensional Nozzles
저자	Hiroshi Miyajima, Tohru Mitani, Shigeru Sato, Shuuichi Ueda, Kouichiro Tani, Tetsuo Hiraiwa, Katsuhiro Ito, Kazuo Kusaka, Muneo Izumikawa,
Keyword	Scramjet; Nozzle performance; Kinetic loss; Two-dimensional loss; Friction loss
URL	http://send.nal.go.jp/send/jpn/dlfile.php3/naltr01149?doctype=7&filetype=20&path0=naltr01149&path1=pdf&path2=naltr01149.pdf
보고서번호	NAL TR-1149
발행년도	1992.4
출처	NAL (National Aerospace Laboratory of Japan)
ABSTRACT	A series of experiments was conducted for studying scramjet nozzle performance under Mach 8 flight conditionsusing high temperature gas e experiments were performed using a thrust measuring system installed in a high altitude test facility.Delivered specific impulse (ISP) by MMH/NTO combustion was found to be 17.3 sec (EN3) to 26.1 sec (EN5).These small increments of ISP in the scramjet nozzles,however,correspond to ISP gains of about 1100 sec for H2 fueled scramjets.Performances of nozzles were predicted using computer codes,and energy release loss,kinetic loss and two-dimensional loss were identified.The two-dimensional loss was predicted to be 16.5％ in the EN3 nozzle and to decrease to 7.0％ in the EN5 nozzle.The kinetic loss due to chemical freezing was found to be 4.4％ (EN3) and 3.0％ (EN5).The nozzle performance could be compared with the experimental results.A friction loss (12.4％) measured by thrusts suggested laminar flow in the scramjet nozzle used in the MMH/NTO experiments.Measured heat flux on nozzles also supported the laminar boundary layer.Experiments using a cold gas flow with the scramjet nozzles were also conducted to co with the hot flow.