Optimal Application of Riblets on Compressor Blades and Their Contamination Behavior
Optimal Application of Riblets on Compressor Blades and Their Contamination Behavior
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DOI：
10.1115/1.4006518
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发表时间：
2011
影响因子：
1.7
通讯作者：
Christoph Lietmeyer;K. Oehlert;J. Seume
中科院分区：
文献类型：
--
作者：
Christoph Lietmeyer;K. Oehlert;J. Seume
在过去的几十年里，沟槽已经显示出减少湍流边界层中粘性阻力的潜力。在文献中曾报道过几次平板和具有理想肋几何形状的涡轮叶片上边界层表面摩擦力的研究和测量。在压气机叶片的表面上必须施加肋的问题仍然没有得到充分的回答。在第一步中，通过具有梯形槽和沿着压气机叶片的吸力侧和压力侧上的表面的恒定几何形状的理想三角形肋来研究型面损失减少。结果表明，在吸力面上设置沟槽对降低叶型损失具有较大的潜力。在第二步中，研究了激光结构肋对层流分离泡的影响以及这些结构对前缘附近层流边界层的影响。在明确了叶片表面应采用沟槽的最佳选择后，提出了一种局部适应沟槽的策略。压缩机叶片的吸入侧是激光结构化的，具有分段的带状结构，在每个段中具有恒定的几何形状。测量的轮廓损失减少示出了与沿表面沿着的恒定条纹几何形状相比，这种局部适应结构对轮廓损失减少的增加的影响。此外，研究了沟槽结构压气机叶片上的颗粒沉积，并与光滑表面上的颗粒沉积进行了比较。结果表明，一个初级粒子沉积在脊尖端，然后由团聚。光滑表面上的颗粒沉积是随机的。版权所有© 2011 ASME
During the last decades, riblets have shown a potential for viscous drag reduction in turbulent boundary layers. Several investigations and measurements of skin-friction in the boundary layer over flat plates and on turbomachinery type blades with ideal riblet geometry have been reported in the literature. The question where riblets must be applied on the surface of a compressor blade is still not sufficiently answered. In a first step, the profile loss reduction by ideal triangular riblets with a trapezoidal groove and a constant geometry along the surface on the suction and pressure side of a compressor blade is investigated. The results show a higher potential on the profile loss reduction by riblets on the suction side. In a second step, the effect of laser-structured ribs on the laminar separation bubble and the influence of these structures on the laminar boundary layer near the leading edge are investigated. After clarifying the best choices where riblets should be applied on the blade surface, a strategy for locally adapted riblets is presented. The suction side of a compressor blade is laser-structured with a segmented riblet-like structure with a constant geometry in each segment. The measured profile loss reduction shows the increasing effect on the profile loss reduction of this locally adapted structure compared to a constant riblet-geometry along the surface. Furthermore, the particle deposition on a riblet-structured compressor blade is investigated and compared to the particle deposition on a smooth surface. Results show a primary particle deposition on the riblet tips followed by an agglomeration. The particle deposition on the smooth surface is stochastic.Copyright © 2011 by ASME