Design and multi-objective optimization of a new annular constructal bifurcation Stirling regenerator using response surface methodology
Design and multi-objective optimization of a new annular constructal bifurcation Stirling regenerator using response surface methodology
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使用响应面法设计和多目标优化新型环形结构分叉斯特林再生器
DOI：
10.1016/j.ijheatmasstransfer.2022.123129
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发表时间：
2022-10
影响因子：
5.2
通讯作者：
Wei Liu
中科院分区：
文献类型：
--
作者：
Minjie Yu;Chunyu Shi;Zhichun Liu;Wei Liu
·基于结构概念设计了一种环形分叉式回热器。·新型蓄热体的基体表面倾斜于气流方向。·采用响应面法和NSGA-Ⅱ优化再生器性能。·回热器提供低不可逆损失和高综合性能。传统多孔回热器的流动损失和轴向导热损失等不可逆损失在很大程度上限制了斯特林发动机的比功率和热效率。因此，本文基于结构概念和响应面方法，设计并优化了一种新型的环形结构分叉回热器，以减小回热器内的流动和轴向传热损失。首先，采用倾斜于流动方向的分叉型结构单元和分层方法构建回热器矩阵。在此基础上，采用数值模拟的方法研究了结构分叉回热器的气体流动和传热特性。基于数值计算数据，采用响应面法建立了回热器几何参数与回热器性能之间的二次多项式回归模型，并通过二维和三维响应面图分析了回热器几何尺寸的具体影响。在此基础上，采用遗传算法对换热管进行了多目标优化，使流动阻力最小，换热速率最大。从最优Pareto前沿中选择了全局摩擦系数f = 3.478、传热单元数NTU = 1.135的最优解。最后，将结构分叉回热器的整体性能与多孔回热器和平行几何回热器进行了比较。结果表明，结构分叉回热器具有较低的流动阻力、较低的轴向导热系数和较高的热性能。因此，环形结构分叉回热器具有较高的综合性能，具有改善斯特林发动机性能的潜力。本文的研究结果可为蓄热室结构的设计和优化提供新的思路和指导。
• A annular bifurcation type regenerator was designed based on constructal concept. • The matrix surface of the novel regenerator was inclined to the gas flow direction. • Regenerator performance was optimized by response surface methodology and NSGA-Ⅱ. • The regenerator offers low irreversible losses and high comprehensive performance. The irreversible losses such as the flow loss and axial heat conduction loss in traditional porous regenerators have limited the specific power and thermal efficiency of Stirling engines to a great degree. Thereby, the objective of this paper is to design and optimize a novel annular constructal bifurcation regenerator for diminishing the flow and axial heat conduction losses in the regenerator based on constructal concept and response surface methodology. First, the bifurcation type structure units with an inclined angle to the flow direction and the layered approach were applied to construct the regenerator matrix. Thereafter, the numerical simulations were employed to investigate the gas flow and heat transfer characteristics of the constructal bifurcation regenerator. Based on the numerical data, the quadratic polynomial regression models between the geometric parameters and the regenerator performance were established using response surface methodology, and the specific effects of the geometric dimensions were analyzed via 2-D and 3-D response surface plots. Subsequently, a multi-objective optimization was conducted to minimize the flow resistance and maximize the heat transfer rate by genetic algorithm. A most eclectic solution with the global friction factor f = 3.478 and the number of heat transfer units NTU = 1.135 was selected from the optimal Pareto front. Finally, the overall performance of the constructal bifurcation regenerator was compared with that of the porous regenerator and the parallel geometry regenerator. The results indicate that a low flow resistance, low axial heat conduction, and high thermal performance are obtained by the constructal bifurcation regenerator. Therefore, it is reasonable to conclude that the annular constructal bifurcation regenerator achieves a high comprehensive performance, with the potential to improve the performance of Stirling engines. The findings of this paper may provide some new ideas and guidelines for the design and optimization of the regenerator structures.
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