title: Combined velocity and temperature imaging of gas flow in an engine cylinder.
abstract: A combined velocity and temperature measurement method using a high-speed camera, a pulsed UV laser, and temperature-sensitive phosphor particles is proposed. The temperature was calculated from the phosphorescence lifetime, while the velocity was obtained from images of the phosphor particles during a single decay. This method was applied to in-cylinder measurements of gas flow at high temperatures under motoring conditions. Tumble flow was observed at the top dead center. The temperature-change dependence on the crank angle agrees qualitatively with the gas temperature and the pressure.
authors.affiliation: National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki, Japan. s.someya@aist.go.jp
authors.forename: Satoshi
authors.initials: S
authors.lastname: Someya
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Okura
authors.forename: Mitsunori
authors.initials: M
authors.lastname: Uchida
authors.forename: Yoshihisa
authors.initials: Y
authors.lastname: Sato
authors.forename: Koji
authors.initials: K
authors.lastname: Okamoto