Flow loss mechanism of high subsonic compressor blade vibration under low Reynolds number conditions
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摘要:
为了探索低雷诺数
Re 下高亚声速压气机叶片振动对附面层流动状态的影响,利用数值模拟手段分析了压气机叶片在不同振动频率下叶片表面附面层分离、再附及转捩的变化规律和流动损失的变化规律。研究表明,在Re =1.5×105条件下,叶片振动引起附面层垂直壁面法向的相对速度增加,使得分离后的附面层提前与主流发生掺混,促使转捩提前,此时壁面附近法向位置处的法向速度型更饱满,这提升了附面层抗分离的能力,限制了分离泡的发展。此外,叶片振动造成附面层和分离泡厚度变“薄”,这使得尾缘堆积的低能流体减少,削弱了尾缘附近流动堵塞和尾迹掺混,进而减少流动损失,改善了低Re 条件下高亚声速压气机叶型的气动性能。Abstract:In order to investigate the influence of high subsonic compressor blade vibration on the flow state of the surface layer under low Reynolds number (
Re ) conditions, numerical simulations were conducted to analyze the rule of separation, re-attachment, transition and flow loss of compressor blade surface boundary layer under different vibration frequencies. According to the simulation results, under the condition ofRe =1.5×105, the increase in the normal relative velocity of the vertical wall of the surface layer caused by blade vibration could trigger the mixing of the separated surface layer with the mainstream in advance, which promoted the advance of transition. In this case, the normal velocity pattern at normal position near the wall was fuller, which improved the ability of the boundary layer to resist separation and limited the development of the separation bubble. In addition, the boundary layer and separation bubble thickness became "thin" due to blade vibration, which reduced the accumulation of low-energy fluid at the trailing edge, and weakened flow blockage near the trailing edge and wakes mixing, thereby reducing flow loss and improving the aerodynamic performance of the high subsonic compressor blade under low Re conditions.-
Key words:
- low Reynolds number /
- compressor blade /
- blade vibration /
- boundary layer separation /
- transition
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表 1 V103几何及气动参数
Table 1. V103 Geometric and aerodynamic parameters
参数 数值 C/mm 180 t/s 0.55 $d'_{\mathrm{max}} $/C 0.055 βu/(°) 48 βs/(°) 112.5 Ma 0.67 Re 150000 β1/(°) 132 β2/(°) 96 表 2 不同拓扑结构的性能参数对比
Table 2. Comparison of performance parameters of different grid topology
方案 网格
数量/105展向网格
层数单层网格
数量/105总压损失
系数ω0 7.6 2 3.8 0.0499 1 28.6 3 9.53 0.0472 2 33.4 3 11.1 0.0471 3 52.4 4 13.1 0.0470 表 3 V103工况点参数
Table 3. V103 operating condition point parameters
计算工况参数 数值 进口总压p01/Pa 5090.0 进口总温T01/K 236.1 进口气流角β1/° 132 进口马赫数Ma 0.67 进口雷诺数Re 150000 进口湍流度Tu 3.5% 出口静压p2/Pa 4373.76 表 4 V103不同工况参数
Table 4. V103 parameters under different operating conditions
方案 振动幅度/mm 振动频率/Hz 折合频率 1 0 0 k0=0 2 0.25%C 1400 k1=1.275 3 0.25%C 1500 k2=1.366 -
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