Unsteady Performance of Finite-Span Pitching Propulsors in Side-by-Side Arrangements
Unsteady Performance of Finite-Span Pitching Propulsors in Side-by-Side Arrangements
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DOI：
10.2514/6.2018-3732
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发表时间：
2018-06
期刊：
影响因子：
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通讯作者：
Melike Kurt;K. Moored
中科院分区：
文献类型：
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作者：
Melike Kurt;K. Moored
对两个展弦比为 AR = 2 的有限跨距俯仰机翼并排相互作用的性能进行了实验测量。针对各种同步和跨流间隔进行了实验。报告单个机翼和集体机翼的推力、功率和升力系数以及效率。我们发现，对于 Y* ≤ 0.75 的紧密间距，在异相振荡 (φ = π) 期间，集体推力和功耗会增加，而效率会下降。类似地，对于 Y* ≤ 1.125 的间距，在同相振荡 (φ = 0) 期间，总推力和功耗会降低，而效率会增加。与提高推力或效率之间的这种权衡相反，存在一些条件，例如在 Y* = 1 和 φ ≈ π/2 和 3π/2 时，集体推力增加 20%，同时集体效率增加 17%。进一步证明，集体升力的方向显示出对同步性和间距的依赖性。
Experimental measurements are presented on the performance of two finite-span pitching wings with an aspect ratio of AR = 2 interacting in a side-by-side arrangement. Experiments are conducted for various synchronies and cross-stream spacings. The thrust, power and lift coefficients as well as the efficiency are reported for both the individual wings and the collective. The collective thrust and power consumption are found to increasewhile the efficiency decreases during out-of-phase oscillations (φ = π) for close spacings of Y∗ ≤ 0.75. Similarly, the collective thrust and power consumption are found to decrease while the efficiency increases during inphase oscillations (φ = 0) for spacings of Y∗ ≤ 1.125. In contrast to this trade-off between improved thrust or efficiency, there are conditions such as at Y∗ = 1 and φ ≈ π/2 and 3π/2 that give a 20% increase in collective thrust and 17% increase in collective efficiency at the same time. It is further demonstrated that the direction of the collective lift shows a dependence on both the synchrony and the spacing.