국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Measurements of Dynamic Stability of Capsule-Type Re-Entry Vehicles at Hypersonic Speeds
저자	Yukimitsu YAMAMOTO, Mitsunori WATANABE, Shigeaki NOMURA, Tadao KOYAMA, Koichi HOZUMI, Akira YOSHIZAWA, Tetsuichi ITO,HITOSHI TAKATSUKA
Keyword
URL	http://send.nal.go.jp/send/jpn/dlpdf.php3/naltm00556.pdf?id=NALTM0000556
보고서번호	NAL TM-556
발행년도	1986.11
출처	NAL (National Aerospace Laboratory of Japan)
ABSTRACT	Hypersonic wind tunnel tests were conducted to measure the pitch damping characteristics of a series of capsule-type vehicles at a Mach number of 7. 1. Data were obtained utilizing thesmall amplitude free oscillation technique at angles of attack from 0 to 10deg at a Reynolds number of 4.5?104, based on a unit length (cm). Model configurations are classified into two types, i. e. , 1) a blunt cone type (S-type) which consists of a model with half cone angles of 6갞 and 10갞, and 2) acapsule type (M-type) which has a blunted forebody followed by a conical boattail and cylinder. Results of the tests indicate that S-type models are dynamically stable through the angles of attack, whereas M-type models reveal dynamic instability at low angles of attack. These trends are thought to be due to flow reattachment effects occurring on the cylinder surface of the capsules. These undamping results can be eliminated or greatly reduced by taking angles of attack.