軸流圧縮機でのアクティブストール制御の研究 : 第1報:あるストール警報手法

概要

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This paper studies the stall warning technology for active stall control which explores the possibility of reducing current excessive stall margin requirement for compressor design based on accumulation of the worst case scenario. In order to obtain early and secure warning, a unique scheme which provides stall-risk index was developed based on pressure signals by high response transducers on the casing wall at a location of the rotor leading edge. The index is generated by computing correlation of pressure time histories of current and one previous revolution over each blade pitch. Tests on the low-speed, single-stage research compressor exhibited remarkable deterioration of the correlation value with proximity to stall sufficiently in advance of so-called spike inception. Extensive experiments showed that degree of the index deterioration depends on various factors such as flow coefficient, tip clearance and rotor incidence. In order to provide reliable stall warning in practical application, these effects must be carefully examined.
2006-05-20