论文部分内容阅读
首先简要介绍了国内外有关周期振荡／往复流动的研究进展情况。然后，从最基本的流体力学方程出发， 探讨了描述振荡流动从层流到湍流转变的无量纲准则数。研究了圆管内处于充分发展层流的周期性往复流动时的流动阻力特性以及动力学特性。最后， 对广泛使用于回热式热机（发动机和制冷机）的回热器的流动阻力特性及动力学特性进行了分析研究， 在综合前人各种理论及实验成果的基础上， 提出了作者的看法。以上研究对深入认识周期往复流动的规律有一定的作用。
First of all, the research progress of periodic oscillatory / reciprocating flow at home and abroad is briefly introduced. Then, based on the most basic fluid mechanics equations, the dimensionless criterion describing the transition from laminar to turbulent flow is discussed. The flow resistance and dynamic characteristics of a circular tube in a fully reciprocating flow with sufficient laminar flow are studied. Finally, the flow resistance characteristics and dynamic characteristics of regenerator widely used in regenerative heat engine (engine and refrigerator) are analyzed and studied. Based on the previous theoretical and experimental results, author the opinion of. The above research has a certain effect on the thorough understanding of the law of periodic reciprocal flow.