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首页> 外文期刊>Journal of the American Helicopter Society >Boundary Layer Transition Measured by DIT on the PSP Rotor in Forward Flight
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Boundary Layer Transition Measured by DIT on the PSP Rotor in Forward Flight

机译：在向前飞行中的PSP转子下用DIT测量的边界层过渡

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摘要

A well-defined reference set of data for computational fluid dynamics and comprehensive code validation for a scaled helicopter main rotor with boundary layer transition in forward flight is presented. The boundary layer transition was measured using differential infrared thermography (DIT) on the top (suction) side of the NASA/Army "PSP rotor" in the NASA Langley 14-by-22-Foot Subsonic Tunnel. The tests used a FLIR X8500 SLS long-wave infrared camera to observe the three-bladed rotor. The boundary layer transition was detected for forward flight at an advance ratio of 0.3 (115 kt). The measured boundary layer transition positions are consistent with previous measurements and predicted boundary layer transition locations. A method for the analysis of DIT images for a rotor in forward flight is shown and validated based on computational analysis of a pitching airfoil with varying inflow, showing both qualitative and quantitative similarity to experimental data.
机译：呈现了一种明确的用于计算流体动力学数据和具有前向飞行中具有边界层转换的缩放直升机主转子的综合码验证。使用NASA / ARMY“PSP转子”的顶部（抽吸）侧的差分红外热成像（DIT）测量边界层转变，在美国宇航局/军队“PSP转子”中的NASA Langley 14-ob-22-of-22英尺的亚源隧道中的顶部（抽吸）侧。该测试使用FLIR X8500 SLS长波红外相机来观察三个叶片转子。以0.3（115kt）的预先比率检测边界层转变。测量的边界层过渡位置与先前的测量和预测的边界层转换位置一致。基于具有变化流入的俯仰翼型的计算分析，示出了用于分析转子的DIT图像的方法，并验证了具有不同流入的俯仰翼型，显示与实验数据的定性和定量相似性。

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