CAJ | 학술논문

为了揭示高低空环境对压气机气动弹性稳定性的影响机理，采用谐波平衡技术和能量法对叶片在不同工作高度下的颤振特性进行了数值研究。结果表明：近失速二阶模态下叶片在地面和高空于不同的波节数1和2时达到最小气动阻尼状态；近失速前两阶模态下高低空叶片的气动阻尼系数（LogDec）最小值分别为0.5460%，0.4521%和0.3460%，0.2168%，但叶尖处地面的当地LogDec小于高空值；对于近失速一阶模态，叶片尖部的非定常压力脉动随着工作高度的变化呈现出不同的时空形态，从而导致当地积累功存在较大差异。
위료게시고저공배경대압기궤기동탄성은정성적영향궤리，채용해파평형기술화능량법대협편재불동공작고도하적전진특성진행료수치연구。결과표명：근실속이계모태하협편재지면화고공우불동적파절수1화2시체도최소기동조니상태；근실속전량계모태하고저공협편적기동조니계수（LogDec）최소치분별위0.5460%，0.4521%화0.3460%，0.2168%，단협첨처지면적당지LogDec소우고공치；대우근실속일계모태，협편첨부적비정상압력맥동수착공작고도적변화정현출불동적시공형태，종이도치당지적루공존재교대차이。
In order to uncover the effect mechanics of high-low altitude on aeroelasticity stability of compres?sor,blades flutter characteristics in different altitudes were investigated through numerical study based on har?monic balance technique and energy method. Results show that,for the 2nd mode on the near stall point,the mini?mum aerodynamic damping of blades corresponding to nodal diameter has the value of 1 on the ground,while the value of 2 in high altitude. The minimum values of aerodynamic damping coefficient(LogDec)of blades were 0.3460%,0.2168%and 0.5460%,0.4521%,respectively,in high and low altitude for the first two modes on the near stall point,nevertheless,at the blade tip the local LogDec on the ground is less than this in high altitude. The unsteady pressure perturbations present various time-space shapes with different working altitudes at the blade tip corresponding to the first mode on the near stall point,which results in a huge discrepancy of local work sum?mation.