变截面直立管气泡泵理论模型验证研究  

THEORETICAL MODEL VALIDATION STUDY OF VARIABLE CROSS-SECTION UPRIGHT TUBULAR BUBBLE PUMP

作　　者：陈永军[1] 刘道平[1] 黄塬琳 赵荣祥[1] 陆引哲[1] 

机构地区：[1]上海理工大学制冷技术研究所,上海200093

出　　处：《太阳能学报》2016年第4期917-923,共7页Acta Energiae Solaris Sinica

基　　金：上海市研究生创新基金(JWCXSL1302);上海市教育委员会科研创新项目(13ZZ117)

摘　　要：气泡泵结构单一、运行稳定差、效率低，为解决此问题该文提出渐缩式变截面直立管气泡泵和改进发生器出口，建立气泡泵理论模型，对其在绝热弹状流下的提升特性进行理论分析，对该理论结果进行实验验证并与直径相当的直管气泡泵提升性能进行对比。结果表明：沉浸比小于0．30和气体流量在0．05—0．15g／s时，理论值与实验值曲线吻合性较好，而超出此范围由于提升管内流型改变两曲线逐渐偏离；在热源功率250～350W时变截面管气泡泵提升效率高达12．8％；低驱动功率为气泡泵充分利用低品位热源提供可能。分析表明变截面直立管应用和发生器出口改进有利于提高气泡泵工作性能，为利用太阳能，工业余热废热驱动的气泡泵优化设计、性能改善提供理论依据。The tapered upright tubular bubble pump with variable cross-section and improved generator outlet were studied to solve the problem of bubble pump, such as simple structure, low efficiency and poor working stability. The analysis was performed on the promoting characteristics of the bubble pump under adiabatic slug flow condition. A theoretical model for the bubble pump was established. The mass-flow lifting was experimentally compared between the variable cross-sectional bubble pump and the straight pipe bubble pump with the equivalent diameter. The results reveal that the experimental data are in reasonable agreement with the calculated values when the immersed ratio is less than 0.3 and gas flow ratio is 0.05-0.15 g/s. However, the flow pattern change leads to the deviation between experimental and theoretical curves beyond this value. The mass-flow lifting efficiency of the variable cross-section bubble pump is 12.8 percent higher than that of the straight pipe bubble pump when the heating power is 250-350 W, which provides the possibility for bubble pump using the low-grade heat source. These demonstrate the application of the variable cross-section upright tube and improved generator outlet are beneficial to improve the working performance of the bubble pump and provide a theoretical guidance for the optimal design and performance enhancement of the bubble pump driven by solar energy and industrial waste heat.

关 键 词：热工学 Einstein制冷 气泡泵 模型验证 低品位热源 变截面 

分 类 号：TB616[一般工业技术—制冷工程] TB657