周期性规则拓扑流动损失的定量分析和预测

Quantitatively Prediction and Analysis of Hydrodynamic Loss across Periodic Regular Topologies

对能源转换系统中的流动损失进行准确评估有助于提高系统能效优化的效率。针对具有周期性规则拓扑的扰流结构,提出了一种可用于定量分析和预测流动损失的完备数学模型。以常见的错排短柱阵列为例,详细阐述了模型的建立方法,以及如何基于所建立的指数型经验方程对流动损失进行定量的因素分析。为此,建立了一套采用对称和周期边界的数值方法,用于高效收集模型建立所需的基础数据。研究结果表明,数学模型中特定结构或流动参数对应指数的绝对值可表征其对流动损失的定量影响。该模型具有较高的普适性,可用于具有类似拓扑特征和任意数量影响因素的扰流结构流动损失分析和预测。

Evaluating hydrodynamic loss in energy conversion systems precisely is of vital importance in improving system energy efficiency. This paper proposed a complete mathematical model which can be used for analyzing and predicting pressure loss across any topology with regular periodic features on a quantitative level. Taking staggered arrays of short pin fins as a typical example, de-tailed process of building up the model is demonstrated, based on which the hydrodynamic loss is analyzed quantitatively according to the exponent-type empirical equations. Specifically, a nu-merical approach is proposed employing symmetric and periodic boundary conditions, to collect fundamental data required for establishing the model. The result indicated that, the absolute value of the exponents of particular structural or hydrodynamic parameters can be used for charac-terizing their quantitative influence upon pressure loss. The model is highly adaptable for various kinds of geometries with similar topology features and amounts of influencing parameters, thus can be used to predict and analyzing the hydrodynamic loss of the aforementioned structures.