@inproceedings{oai:ynu.repo.nii.ac.jp:00003853,
 author = {Kurokawa, Junichi and Saha, Sankar Lar and Matsui, Jun and Kitahora, Takaya},
 book = {Proceeding of US-Japan Seminar: Abnormal Flow Phenomena in Turbomachines, Nov. 1-6, 1998, Osaka, Japan},
 month = {},
 note = {application/pdf, In order to control and suppress several anomalous phenomena, such as a rotating stall in a vaneless or a vaned diffuser of a radial flow turbomachine, performance instability with a positive gradient of head-capacity curve in a mixed flow turbomachine and a draft tube surge in a Francis turbine, a new passive device using shallow grooves on a casing wall is proposed and its effect is studied experimentally. The results show that the shallow grooves with adequate dimensions can suppress these instabilities. Theoretical consideration has revealed that a remarkable effects of shallow grooves are caused by two mechanisms;one is a significant decrease in the tangential velocity due to mixing between the main flow and the groove flow, and the other is an increase in meridional velocity of the main flow due to the reverse flow in the grooves.},
 pages = {1--7},
 title = {A New Passive Device to Suppress Several Instabilities in Turbomachines by Use of J-Grooves},
 year = {1998}
}