矩形流道内低速气流的流动与传热特性研究

Phenomenon of airflow and heat transfer in retangle channel is widely exist in mechanical and electrical products. Characteristics of airflow and heat transfer in rectangular channel, which is set with the heat exchanger and air driving equipment, are studied in order to improve the heat transfer efficiency. According to the analytic of flow characteristics of axial fan and air passing through driven equipment with different structural parameters, effect of hydraulic diameter on distortion of the axial fan performance is analyzed spcifically; Combined with structural parameters, effect of upstream parameters on flow characteristics in the channel is also researched; Characteristics of heat flux distribution are also analyzed. In the research, axial fan is set as the driving device in the channel, and both structural and non structural parameters, such as hydraulic diameter, deflecting ring structure, upstream velocity and conditions, are considered to get a better coupling method of airflow and heat transfer. Based on the research, principle of airflow and heat transfer in retangle channel with axial fan as driving device would be acquired. Results of the research not only can consummate the theory of flow and heat transfer in retangle channel, but also can give effective advices to the channel structure and heat dissipation design in mechanical and electrical products.

矩形流道中的低速气流流动与传热现象广泛存在于机电产品的换热结构中。为提高矩形流道中气流的流动效率与换热效率，本项目对设置有低温换热结构与气流驱动设备的矩形流道中的气流流动与传热特性进行系统研究。解析流道的不同结构参数下气流流经风机与换热结构的流动特性，重点分析流道水力直径对轴流风机特性畸变的影响机理；结合结构参数研究流道入口的不同来流条件对流道内气流流动的影响；在不同的流动状态下解析换热管表面热流密度的分布规律。项目将轴流风机作为气流流动的驱动部件直接集成到流道中，将流道的水力直径、导流罩结构等结构参数，以及来流速度、来流状态等非结构参数集成考虑，进行流动、传热的协同研究，并确立较优的耦合方式，获取矩形流道内以轴流风机为驱动力源的气流流动与传热规律。本项目的研究成果不仅可以完善矩形流道内的气流流动与传热理论，还可为机电产品中的流道设计及散热设计等提供有效指导。

矩形流道中的低速气流流动与传热现象广泛存在于机电产品的换热结构中。为提高矩形流道中气流的流动效率与换热效率，对设置有低温换热结构与气流驱动设备的矩形流道中的气流流动与传热特性进行系统研究。研究了矩形流道内不同风机转速下的流场，并对流场特性进行了相应的分析；在流道的不同进口参数下，发现了轴流风机流场“离心”特性的影响机理，认为轴流风机的旋转，风机的进出口压差以及气流的粘性是导致风机流场“离心”特性的原因。在不同的矩形流道的进口水力直径的条件下，研究了换热管不同位置的温度，并对整体的换热量进行了采集与计算。本项目的研究成果不仅可以完善矩形流道内的气流流动与传热理论，还可为机电产品中的流道设计及散热设计等提供有效指导。