Uncertainty quantification of real stagger angle deviation affecting compressor performance
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摘要:
为研究叶片安装角偏差对压气机性能及稳定性的影响,以单级轴流亚声速压气机为研究对象,采用任意多项式混沌方法作为不确定性量化方法,量化研究了叶片安装角偏差对压气机气动性能和流场结构的不确定性影响。研究发现:性能参数与安装角偏差之间均为完全单调相关,且随着质量流量减小,压气机性能波动程度总体呈减小趋势。安装角偏差改变了气流攻角,在大流量工况下,由于叶根区域负攻角程度最为严重,因此该区域内流场波动程度最大;而在小流量工况下,叶顶间隙泄漏涡受安装角偏差影响明显,叶顶区域流动损失波动程度最大。同时,由于近失速工况下叶顶间隙泄漏涡的发展方向以及膨胀程度随安装角偏差发生变化,叶顶区域堵塞程度受到影响,最终导致压气机稳定性产生波动。
Abstract:In order to study the influence of blade stage angle deviation on compressor performance and stability, a subsonic single rotor axial compressor was taken as the research object and sparse approximation arbitrary polynomial chaos method was used as uncertainty quantification method to evaluate the uncertainty effect of blade stage angle deviation on compressor aerodynamic performance and flow field structure. Results showed that the performance parameters were all monotonically correlated with the stagger angle deviation, and the fluctuation degree of compressor performance decreased with the decline of mass flow rate. The stagger angle deviation changed the incidence angle. Under the condition of large mass flow rate, the fluctuation of the flow field in the blade root area was the largest because the negative incidence angle was the most serious in this area. Under the condition of small mass flow rate, the tip clearance leakage vortex was significantly affected by stagger angle deviation, and the flow loss fluctuation in the blade tip area was the largest. At the same time, because the development direction and expansion degree of tip clearance leakage vortex changed with the stagger angle deviation under near stall condition, the plugging degree of tip area was affected, finally leading to fluctuation of the compressor stability.
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表 1 转子主要设计参数
Table 1. Main design parameters of the rotor
设计参数 数值 设计转速/(r/min) 15200 设计流量/(kg/s) 5.6 总压比 1.249 等熵效率 0.905 叶尖相对马赫数 0.78 轮毂比 0.61 叶片数 30 叶顶间隙/mm 0.35 平均展弦比 1.94 表 2 各叶片组安装角偏差的概率分布
Table 2. Probability distribution of stagger angle deviation of each blade group
组别 安装角偏差相关参数 均值/(°) 标准差/(°) 分布区间/(°) 分布形式 分析方法 G1 0.0409 0.21779 [−0.48, +0.48] 离散点 SAMBA PC G2 0 0.1667 [−0.5, +0.5] 正态分布 NIPC G3 0.0409 0.21779 [−0.612, +0.694] 正态分布 NIPC 表 3 各叶片组性能统计参数对比
Table 3. Comparison of performance statistical parameters of each blade group
参数 G1 G2 G3 OP1 η μ 0.906108 0.905591 0.906122 σ 0.003774 0.002832 0.003639 π μ 1.094565 1.094262 1.094565 σ 0.001820 0.001381 0.001788 OP4 η μ 0.932173 0.932097 0.932172 σ 0.000443 0.000333 0.000437 π μ 1.118218 1.118048 1.118218 σ 0.000922 0.000705 0.000920 OP6 η μ 0.925753 0.925808 0.925752 σ 0.000241 0.000190 0.000249 π μ 1.127515 1.127399 1.127511 σ 0.000634 0.000485 0.000630 ${\varDelta _{{\text{SMI}}}}$/% μ − 0.029754 0.006977 − 0.050607 σ 0.315833 0.223276 0.337653 表 4 相关系数计算结果
Table 4. Calculation result of correlation coefficient
工况 总压比-安装角
偏差相关系数等熵效率-安装角
偏差相关系数OP1 1 1 OP6 1 −1 -
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