Effect of rotor-rotor interaction on blade aerodynamic loads in a vaneless counter-rotating compressor
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摘要:
采用非定常数值模拟研究高负荷无导叶对转压气机级间动/动干涉下叶片表面动态载荷特性。研究表明：上游转子扰动源于下游转子外伸激波扫掠，集中于压力面尾缘结尾激波之后，脉动强度最大可达
25000 Pa，平均为2485.5 Pa，与上游转子叶片表面平均静压的比值分别为24.91%和2.48%，主频为下游转子叶片相对通过频率及其倍频；下游转子扰动源于上游转子尾迹、尾迹涡及其势流，遍布整个叶片表面，脉动强度与主流相对速度分布强相关，在超声速区为8000 Pa，在亚声速区最大可达40000 Pa，平均为6331.25 Pa，其与下游转子叶片表面平均静压的比值分别为0.28%、14.21%和2.25%，主频为上游转子叶片相对通过频率及其倍频。上游转子叶片表面时均力为102.8 N，脉动幅值为21.3 N，压力面受力远大于吸力面；下游转子叶片表面时均力为698.5 N，脉动幅值仅为7.2 N，吸力面与压力面相互抵消。动/动干涉显著强化叶片载荷水平，上游转子扰动集中于叶片尾缘，下游转子集中于叶片表面亚声速区，载荷受激波和叶片表面相对速度分布影响。Abstract:Unsteady numerical simulation method was utilized to study the characteristic of blade dynamic loads under the rotor-rotor interaction in a high-load vaneless counter-rotating compressor. The study showed that: the unsteady pressure pulsation of upstream rotor originated from the shock wave sweeping of the downstream rotor. It mainly concentrated near the pressure surface trailing edge after the upstream rotor blade ending shock wave. Its maximum pulsation intensity was
25000 Pa and average was2485.5 Pa, which were 24.91% and 2.48% related to average static pressure of upstream rotor blade. Its main frequencies were the relative blade pass frequency of the downstream rotor and its multiples. The unsteady pressure pulsation of downstream rotor originated from the wake, wake vortex, and potential wave of upstream rotor. It was spread over the entire blade surface. Its intensity distribution was strongly correlated with the relative velocity distribution, which was8000 Pa in the supersonic region, and40000 Pa in the subsonic region,6331.25 Pa in blade surface average. Its 0.28% and 14.21%, 2.25% were related to average static pressure of downstream rotor blade. Its main frequencies were the relative blade pass frequency of the upstream rotor blade and its multiples. The average force of upstream rotor blade in a period was 102.8 N, and its fluctuation amplitude was 21.3 N. The force on the pressure surface was greater than that on the suction surface. The average force of downstream rotor blade was 698.5 N, its fluctuation amplitude was 7.2 N. The force on the pressure surface and suction surface can cancel each other out. The rotor-rotor interaction of the counter-rotating compressor increased the load on the blade, and the load distribution was affected by the relative velocity distribution and shock wave.-
Key words:
- counter-rotating compressor /
- rotor-rotor interaction /
- aerodynamic load /
- shock wave /
- wake
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图 1 两级无导叶对转压气机子午流道
Figure 1. Meridian channel of two-stage vaneless counter-rotating compressor
图 3 不同物理时间步R1 50%叶高监测点无量纲静压脉动
Figure 3. Normalized static pressure of 50% span monitor points of R1 at different time steps
图 10 50%叶高$ \dfrac{4}{8}T $及$ \dfrac{8}{8}T $时刻的熵
Figure 10. Entropy at $ \dfrac{4}{8}T $ and $ \dfrac{8}{8}T $ in 50% span
图 13 叶片表面非定常静压脉动强度分布
Figure 13. Unsteady pressure fluctuation intensity distribution on blade surface
图 14 Stage 37动静叶片表面非定常静压脉动强度分布
Figure 14. Unsteady pressure fluctuation intensity distribution on rotor and stator blade surfaces of Stage 37
表 1 高负荷对转压气机主要设计参数
Table 1. Main design parameters of highly-loaded counter-rotating compressor
参数 数值 R1 R2 叶尖负荷系数 0.40 0.49 叶片数 23 13 叶尖间隙/mm 0.2 0.2 流量系数 0.40 0.39 叶尖切线速度/（m/s） 416 495 中径扩散因子 0.40 0.49 
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表 2 网格无关性计算结果
Table 2. Grid independency solution
网格数/104 流量系数 压升系数 等熵效率/% 最大偏差/% 113 0.3395 5.4526 80.01 0.28 239 0.3388 5.4533 80.23 0.09 360 0.3386 5.4484 80.30
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表 3 Stage 37主要设计参数
Table 3. Main design parameters of Stage 37
参数 数值 叶尖负荷系数 0.37 叶片数 36 叶尖间隙/mm 0.356 流量系数 0.44 叶尖切线速度/（m/s） 455
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