CAJ | 학술논문

在一台双级低速轴流压气机上进行了均匀进气时的失速起始特性实验研究。利用压气机周向、径向和轴向不同位置的多个动态压力传感器，捕捉到了压气机失速起始过程中不同位置动态压力信号的变化情况，表明压气机的失速起始具有三维非定常特征。压气机在失速前出现了模态波扰动，其传播速度为34．5％转子转速。首先在第2级转子的尖部诱发小失速团，该小失速团的周向范围和旋转频率与充分发展的失速团相同，但不稳定，它同时向下游、径向和上游3个不同方向快速扩展，在扩展过程中周向范围和旋转速度不变。通过对动态总压信号频谱分析和小波分析，发现导致压气机失速的主要原因是第2级转子部分叶排叶尖区域吸力面附面层出现了较大的分离，造成气流堵塞，诱发小失速团。
재일태쌍급저속축류압기궤상진행료균균진기시적실속기시특성실험연구。이용압기궤주향、경향화축향불동위치적다개동태압력전감기，포착도료압기궤실속기시과정중불동위치동태압력신호적변화정황，표명압기궤적실속기시구유삼유비정상특정。압기궤재실속전출현료모태파우동，기전파속도위34．5％전자전속。수선재제2급전자적첨부유발소실속단，해소실속단적주향범위화선전빈솔여충분발전적실속단상동，단불은정，타동시향하유、경향화상유3개불동방향쾌속확전，재확전과정중주향범위화선전속도불변。통과대동태총압신호빈보분석화소파분석，발현도치압기궤실속적주요원인시제2급전자부분협배협첨구역흡력면부면층출현료교대적분리，조성기류도새，유발소실속단。
Stall inception in a two-stage low-speed axial compressor was experimentally investigated with uniform inlet flow.By high response dynamic pressure transducers in circumferential,radial and axial directions,the dynamic pressure data at different positions were collected,and three-dimensional and unsteady characteristic of stall inception was found.The modal wave was found before stall which is rotated at speed of 34.5%rotor.Firstly,small stall cell emerged at the tip of second stage rotor,and the rotating speed was the same as fully developed rotating stall cell.Small stall cell is not stable,and will spread through up-stream,downstream and radial directions with constant circumferential scope and rotating speed.By using frequency and wavelet analyses,the reason of stall cell emergence could be the boundary layer separation around the tip area of second stage rotor.