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圆台扰流板式空气换热器传热与流动特性实验研究

发表时间:2021-03-31  浏览量:42  下载量:4
全部作者: 赵振,徐亮,高建民,席雷,李云龙
作者单位: 西安交通大学机械制造系统工程国家重点实验室
摘 要: 板式空气换热器是热能再利用的重要装备,可以有效地提高能源利用率。本文研究了一种新型的圆台扰流板式空气换热器,通过模拟实际工况,在不同热、冷温比及流速下对其进行了实验研究。根据实验结果拟合了传热准则式和摩擦系数方程,分析了不同雷诺数(Re)下圆台扰流板式空气换热器流动及传热性能,探索了不同温比(Th/Tc)和流速比(Vh/Vc)对总传热系数和熵产数的影响规律,最后通过敏感性分析获得了各输入参数对换热器性能影响的重要程度。研究结果表明:拟合得到的准则式与实验结果较为符合;与光滑圆管相比,圆台扰流板式空气换热器的传热性能提升了1.93~1.69倍,但相应的阻力系数增加了4.66~7.33倍,综合性能提升了11.68%~17.98%. 综合考虑总传热系数和熵产数时,应尽可能地选择温比较低及流速相近的工况,此外,流速比对总传热系数的影响更大,而温比在对熵产数的影响中占主导作用。研究结果可为未来先进空气换热器的结构设计提供参考和借鉴。
关 键 词: 工程热物理;圆台扰流单元;传热特性;总传热系数;熵产数
Title: Experimental investigation on heat transfer and flow characteristics of a plate air heat exchanger with cone-type vortex generator
Author: ZHAO Zhen, XU Liang, GAO Jianmin, XI Lei, LI Yunlong
Organization: State Key Laboratory for Manufacturing Systems Engineering, Xi’an Jiaotong University
Abstract: Plate air heat exchanger is an important equipment of heat energy reuse, which can effectively improve energy utilization. In this study, a new type of plate air heat exchanger with cone-type vortex generator is studied. The experimental study is carried out under different heat, cold temperature ratios and flow rate ratios by simulating the actual working conditions. According to the experimental results, the heat transfer criterion formula and friction coefficient equation are fitted, the flow and heat transfer performance of the plate air heat exchangers with cone-type vortex generator at different Reynolds numbers (Re) is analyzed, the effects of heat, cold temperature ratio (Th/Tc) and flow rate ratio (Vh/Vc) on the total heat transfer coefficient and entropy production number are explored, the importance of each input parameter on the performance of the heat exchanger is obtained through sensitivity analysis. The results show that the fitted criterion formula is in good agreement with the experimental results. Compared with the smooth circular tube, the heat transfer performance of the plate air heat exchanger with cone-type vortex generator is increased by 1.93-1.69 times, the corresponding resistance coefficient is increased by 4.66-7.33 times, and the comprehensive performance is improved by 11.68%-17.98%. When considering the total heat transfer coefficient and entropy production number, the working conditions with low temperature ratio and similar flow rate should be selected as far as possible. In addition, the flow rate ratio has a greater impact on the total heat transfer coefficient, and the temperature ratio plays a major role in the entropy production number. The results of this paper can provide reference for the structure design of advanced air heat exchanger in the future.
Key words: engineering thermophysics; cone-type vortex generator; heat transfer performance; overall heat transfer coefficient; entropy production number
发表期数: 2021年3月第1期
引用格式: 赵振,徐亮,高建民,等. 圆台扰流板式空气换热器传热与流动特性实验研究[J]. 中国科技论文在线精品论文,2021,14(1):26-37.
 
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