论文标题
非稳态传热对商业水力流动蓄能器行为的影响
Effects of Unsteady Heat Transfer on Behaviour of Commercial Hydro-Pneumatic Accumulators
论文作者
论文摘要
液压蓄能器在几乎所有流体动力系统中的储能中起着核心作用。蓄能器充当水力悬浮液中的脉动阻尼器或能量存储装置。通常会定期将携带气体的能量压缩和压缩。热传递到外部，显着决定了累加器的转移行为，因为传热会改变封闭气体的热力学状态。累加器操作模式的范围从等温到绝热。充分模拟流体动力系统需要了解累加器的转移行为，从而了解传热。工程师在技术系统中建模传热的方法是牛顿定律。但是，研究表明，在谐波振荡的气体体积中，热通量和散装温度差会改变其相位。牛顿定律无法代表这种身体现象。我们对商业膜蓄能器的两种尺寸进行了测量。实验数据证实了牛顿方法的失败。取而代之的是，可以以额外的速率术语对热传递进行建模，并且可以独立于累加器的大小进行建模。给出了传热和正确的累加转移行为的相关方程。
Hydraulic accumulators play a central role as energy storage in nearly all fluid power systems. The accumulators serve as pulsation dampers or energy storage devices in hydro-pneumatic suspensions. The energy carrying gas is compressed and decompressed, often periodically. Heat transfer to the outside significantly determines the transfer behaviour of the accumulator since heat transfer changes the thermodynamic state of the enclosed gas. The accumulators operating mode ranges from isothermal to adiabatic. Simulating fluid power systems adequately requires knowledge of the transfer behaviour of the accumulators and therefore of the heat transfer. The Engineer's approach to model heat transfer in technical system is Newton's law. However, research shows, that in harmonically oscillating gas volumes, heat flux and bulk temperature difference change their phase. Newton's law is incapable of representing this physical phenomenon. We performed measurements on two sizes of commercial membrane accumulators. Experimental data confirm the failure of Newton's approach. Instead the heat transfer can be modelled with an additional rate dependent term and independently of the accumulator's size. Correlation equations for the heat transfer and the correct accumulator transfer behaviour are given.
