论文标题
内流能量收割机中的扑动不稳
Flutter Instability in an Internal Flow Energy Harvester
论文作者
论文摘要
基于振动的流量收获可以为低功率应用（例如分布式传感器网络）提供强大的原位能量提取。流体结构不稳定性决定了收割机的生存能力，因为对流动的结构响应决定了其功率输出。以前对基于弹性的流量能量收割机的工作表明，在收敛变化通道中的弹性成员易受气体弹性弹力的影响。这项工作探讨了通过实验和模拟驱动颤动的机制。然后，基于通道流量率调制开发模型，并考虑正常和跨度流量限制对不稳定性的影响。模型的线性稳定性分析复制了在实验中观察到的颤动发作，临界频率和模式形状。该模型表明，通过通道喉通道调制是流体诱导的振动的主要机制。提出的广义模型可以作为能量收获者设计参数探索的基础，也许将来会导致更强大的设备，也可以导致其他类似的流量几何形状，这些几何形状在狭窄的流动过程中弹性构件中会产生颤动的不稳定。
Vibration-based flow energy harvesting enables robust, in-situ energy extraction for low-power applications, such as distributed sensor networks. Fluid-structure instabilities dictate a harvester's viability since the structural response to the flow determines its power output. Previous work on a flextensional-based flow energy harvester demonstrated that an elastic member within a converging-diverging channel is susceptible to the aeroelastic flutter. This work explores the mechanism driving flutter through experiments and simulations. A model is then developed based on channel flow-rate modulation and considering the effects of both normal and spanwise flow confinement on the instability. Linear stability analysis of the model replicates flutter onset, critical frequency, and mode shapes observed in experiments. The model suggests that flow modulation through the channel throat is the principal mechanism for the fluid-induced vibration. The generalized model presented can serve as the foundation of design parameter exploration for energy harvesters, perhaps leading to more powerful devices in the future, but also to other similar flow geometries where the flutter instability arises in an elastic member within a narrow flow passage.
