Co-existing Behavior of Surge and Rotating Stall Using Shock Tube and Windmill Characteristics in an Axial-Flow Compressor

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K05811
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Fluid engineering
• Research Institution: Waseda University
• Principal Investigator: Ohta Yutaka 早稲田大学, 理工学術院, 教授 (50211793)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: ターボ機械 / 旋回失速 / サージ / ウインドミル / 非定常数値解析 / 非設計運転状態 / 流体損失 / 非定常渦

Outline of Final Research Achievements

Unsteady phenomena and loss generation mechanism of axial-flow compressor off-design operation were investigated by detailed experiments and precise numerical simulations.Research attentions were focused on (1)unsteady flow field and cycle characteristics of co-existing state of surge and rotating stall, and (2)unsteady separated flow field and loss generation mechanism at windmill operation in high volume flow rate.
Experimental results showed that global characteristics of surge and rotating stall were found to be determined by the cascade flow structure during the surge cycle. On the other hand, unsteady numerical simulations revealed loss generation mechanism and structure of loss core developed in the rotor and/or stator cascades under the windmill operations.

Free Research Field

流体工学