Thrust performance of unsteady propulsors using a novel measurement system, and corresponding wake patterns.
Thrust performance of unsteady propulsors using a novel measurement system, and corresponding wake patterns.
复制标题
使用新颖的测量系统和相应的尾流模式来测量非定常推进器的推力性能。
DOI：
10.1007/s00348-008-0489-1
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发表时间：
2008
影响因子：
2.4
通讯作者：
Smits,AlexanderJ
中科院分区：
文献类型：
--
作者：
Buchholz,JamesHJ;Clark,RichardP;Smits,AlexanderJ
描述了一种用于测量由生物启发的振荡水动力推进器产生的不稳定推力和推进效率的装置。力测量是使用基于应变计的力传感器实现的，并通过杠杆增强或减弱所施加的力并控制测量灵敏度和振动的固有频率。该杠杆可用于将系统调整到特定应用，并且结果表明，使用该杠杆，可以使刚度增加的速度快于测量灵敏度下降的速度。效率是通过测量施加给流体的时间平均功率来计算的。该装置应用于两种不同的推进器，展示了系统的多功能性；对尾流可视化进行了检查，这提供了对有效推进的物理机制的深入了解。
An apparatus is described for the measurement of unsteady thrust and propulsive efficiency produced by biologically inspired oscillating hydrodynamic propulsors. Force measurement is achieved using a strain-gauge-based force transducer, augmented with a lever to amplify or attenuate the applied force and control the measurement sensitivity and natural frequency of vibration. The lever can be used to tune the system to a specific application and it is shown that, using the lever, the stiffness can be made to increase more rapidly than the measurement sensitivity decreases. Efficiency is computed from measurements of the time-averaged power imparted to the fluid. The apparatus is applied to two different propulsors, demonstrating the versatility of the system; wake visualizations are examined, which provide insight into the physical mechanisms of efficient propulsion.