太阳能斯特林机热交换器动态流阻损失数值分析  

Numerical analysis of dynamic flow resistance loss in solar power Stirling engine's heat exchanger

作　　者：曾俊[1] 彭佑多[1] 戴学[1] 肖蓉[1] 

机构地区：[1]湖南科技大学机械设备健康维护省重点实验室,湖南湘潭411201

出　　处：《湖南科技大学学报（自然科学版）》2015年第2期33-39,共7页Journal of Hunan University of Science And Technology：Natural Science Edition

基　　金：湖南省战略性新型产业重大科技攻关项目(2011GK4058);湖南省高校产学研基金项目(11CY020)

摘　　要：建立了太阳能斯特林机热交换器流阻损失方程,确定了其内工质流速和质量流率与转角的内在联系,开展了热交换器动态流阻损失数值计算,得到了回热器、加热器和冷却器动态流阻损失特性及其与热交换器参数的关系.研究表明:回热器、冷却器、加热器流阻功率损失比例分别为65.5%,19%和15.5%.回热器内流阻损失随丝网目数的增加而增大,随丝网孔隙率的增加而减小;冷却器内正、反向流阻损失峰值分别出现在转角100°和270°附近,且反向峰值更大;加热器内流阻损失曲线在横轴两侧不对称,正、反向峰值分别在转角144°和300°位置取得,且正向峰值大于反向峰值;同时在加热器和冷却器中,管径对流阻损失的影响均更显著.The flow resistance loss equations were built,that of solar power Stirling engine heat exchanger, and internal connection between the working medium speed was determined,mass flow rate and rotation angle, the heat exchanger numerical calculation of dynamic flow resistance loss was carried out,and the relationship was obtained that between different parameters and dynamic flow resistance loss in heat exchanger.Research shows that the mechanical power loss in regenerator,heater and cooler each accounted for 65.5%,19% and 15.5%. In regenerator the flow resistance loss increase with the rise of screen mesh number,decreases with the rise of mesh porosity.The peak of positive and reverse flow resistance loss in cooler appeared near the angle 100°and 270°respectively,and reverse is greater than the positive.Inside the heater,flow resistance loss curve asymmetry on each side of the horizontal axis,positive and reverse peak at angle 144°and 300°respectively, and positive peak is greater than the reverse.Effect of pipe diameter on the flow resistance loss both in the heater and cooler are more significant.

关 键 词：斯特林热机 热交换器 流阻损失 数值计算 

分 类 号：TH4[机械工程—机械制造及自动化]