花瓣螺旋通道内流动与换热特性数值模拟研究
发布时间：2025-06-25 23:55
随着紧凑型热交换器的广泛使用,许多科研人员已经密切关注着它。在不显着增加其设计成本的情况下进一步提高紧凑热转换器效率的方法已得到积极开发,使用扭曲的N瓣管就是其中之一。但是,对于三瓣管和四瓣管的研究通常仅限于以水为工作介质的情况,并没有详细分析四瓣管的结构参数对流动特性和传热的影响。因此,这项工作从四瓣管结构特性对流动特性和传热的影响方面进行了全面的分析。同时,还对三瓣管和四瓣管进行了比较。针对超临界CO2,CH4和水这三种介质,研究人员研究了运行条件对流动特性和传热特性的影响。首先,使用ANSUYS FLUENT软件包,使用以下设置开发了所考虑横截面几何形状的三维模型:稳态、SST k-ω湍流模型。接下来分析了结构参数对压降、传热系数和TPF的影响。结果表明,管的L/D比和扭曲角α越高,导热率和压降就越高。然后通过分析TPF值(与传统圆管的传热效率相比),可以得出最大TPF的计算公式。对于四瓣管:L/D=0.05,α=1.285o;对于三瓣管:L/D=0.05,α=2.57o。之后,对这些横截面形状进行比较,最终选择了四瓣管进行更深入的研究。其次,分析了运行条件对超临界CO2,CH4的...
【文章页数】：84 页
【学位级别】：硕士
【文章目录】：
摘要
Abstract
Nomenclature
Chapter 1 Introduction
1.1 Research background, research purpose and significance
1.2 Literature review
1.3 Analysis of literature review
Chapter 2 Numerical calculation method
2.1 Introduction
2.2 Mathematical approach
2.2.1 Basic governing equation of viscous flow
2.2.2 Turbulence models
2.2.3 Numerical method
2.3 Numerical model comparison and validation
2.3.1 Computational methods and models.#.
2.3.2 Meshing
2.3.3 Supercritical CO2 verification
2.3.4 Supercritical CH4 verification
2.4 Water analytical verification
2.5 Chapter summary
Chapter 3 The study of the influence of tube geometry on the flow and heat transfer characteristics
3.1 Introduction
3.2 Geometric model parameters of the lobed tubes
3.3 Mesh independence test
3.4 The influence of the structural parameters of the tube on the heat transfercharacteristics of the flow
3.4.1 L/D ratio influence
3.4.2 The influence of the tube twisting angle α
3.5 Chapter summary
Chapter 4 The study of the influence of operational conditions on the flow and heattransfer characteristics
4.1 Introduction
4.2 Supercritical CO2
4.2.1 Mass flow influence
4.2.2 Inlet temperature influence
4.3 Supercritical CH4
4.3.1 Mass flow influence
4.3.2 Inlet temperature influence
4.4 Water
4.4.1 Mass flow influence
4.4.2 Inlet temperature influence
4.5 Development of correlation equations
4.6 Chapter summary
结论
Conclusions
References
Acknowledgement
本文编号：4052822
【文章页数】：84 页
【学位级别】：硕士
【文章目录】：
摘要
Abstract
Nomenclature
Chapter 1 Introduction
1.1 Research background, research purpose and significance
1.2 Literature review
1.3 Analysis of literature review
Chapter 2 Numerical calculation method
2.1 Introduction
2.2 Mathematical approach
2.2.1 Basic governing equation of viscous flow
2.2.2 Turbulence models
2.2.3 Numerical method
2.3 Numerical model comparison and validation
2.3.1 Computational methods and models.#.
2.3.2 Meshing
2.3.3 Supercritical CO2 verification
2.3.4 Supercritical CH4 verification
2.4 Water analytical verification
2.5 Chapter summary
Chapter 3 The study of the influence of tube geometry on the flow and heat transfer characteristics
3.1 Introduction
3.2 Geometric model parameters of the lobed tubes
3.3 Mesh independence test
3.4 The influence of the structural parameters of the tube on the heat transfercharacteristics of the flow
3.4.1 L/D ratio influence
3.4.2 The influence of the tube twisting angle α
3.5 Chapter summary
Chapter 4 The study of the influence of operational conditions on the flow and heattransfer characteristics
4.1 Introduction
4.2 Supercritical CO2
4.2.2 Inlet temperature influence
4.3 Supercritical CH4
4.3.2 Inlet temperature influence
4.4 Water
4.4.1 Mass flow influence
4.4.2 Inlet temperature influence
4.5 Development of correlation equations
4.6 Chapter summary
结论
Conclusions
References
Acknowledgement
本文编号：4052822
本文链接：https://www.wllwen.com/kejilunwen/dongligc/4052822.html
