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首页> 外文会议>ASME Turbo Expo vol.6 pt.A; 20050606-09; Reno-Tahoe,NV(US) >Separation and Transition Control on an Aft-loaded Ultra-High-Lift LP Turbine Blade at Low Reynolds Numbers: Low-Speed Investigation
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Separation and Transition Control on an Aft-loaded Ultra-High-Lift LP Turbine Blade at Low Reynolds Numbers: Low-Speed Investigation

机译：低雷诺数的船尾超高功率LP涡轮叶片的分离和过渡控制：低速研究

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摘要

An experimental study was conducted to improve the performance of an aft-loaded ultra-high-lift low-pressure turbine blade known as U2 at low Reynolds numbers. This was achieved by manipulation of the laminar-turbulent transition process on the suction surface. The U2 profile was designed to meet the targets of reduced cost, weight and fuel burn of aircraft engines. The studies were conducted on both low-speed and high-speed experimental facilities under the unsteady flow conditions with upstream passing wakes. The current paper presents the low-speed investigation results. On the smooth suction surface, the incoming wakes are not strong enough to suppress the separation bubble due to the strong adverse pressure gradient on the suction surface and the low wake passing frequency, which allows the separation between the wakes more time to re-establish. Therefore, the profile losses of this ultra-high-lift blade are not as low as conventional or high-lift blades at low Reynolds numbers even in unsteady flows. Two different types of passive separation control devices, i.e. surface trips and air jets, were investigated to further improve the blade performance. The measurement results show that the profile losses can be further reduced to the levels similar to those of the high-lift and conventional blades due to the aft-loaded nature of this ultra-high-lift blade. Detailed surveys of the blade surface boundary layer developments showed that the loss reduction was due to the suppression of the separation underneath the wakes, the effect of the strengthened calmed region and the smaller separation bubble between wakes.
机译：进行了一项实验研究，以改善低雷诺数下船尾加载的超高升程低压涡轮叶片（称为U2）的性能。这是通过操纵吸力表面上的层流湍流过程实现的。 U2型材旨在满足降低飞机发动机成本，重量和燃油消耗的目标。这些研究是在非恒定流动条件下，在上游通过尾流的情况下，在低速和高速实验设施上进行的。当前的论文介绍了低速调查的结果。在光滑的吸力表面上，由于吸力表面上的强烈不利压力梯度和较低的尾流通过频率，进入的尾流强度不足以抑制分离气泡，这使尾流之间的间隔有更多的时间重新建立。因此，即使在不稳定的流动中，这种超高升力叶片的轮廓损失也没有低雷诺数下的常规或高升力叶片低。为了进一步提高叶片性能，研究了两种不同类型的被动式分离控制装置，即表面行程和空气喷射。测量结果表明，由于这种超高升力叶片的船尾负载特性，其轮廓损失可以进一步降低到与高升力叶片和常规叶片相似的水平。叶片表面边界层发展的详细调查表明，损失的减少是由于尾流下方分离的抑制，强化的平静区域的影响以及尾流之间较小的分离气泡的影响。

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