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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0.05~0.15 g/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250~350 W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。
In order to solve this problem, this paper proposes a tapered variable section vertical riser bubble pump and an improved generator outlet. The theoretical model of the bubble pump is established, and its lifting characteristics under adiabatic slug flow The theoretical analysis is carried out. The theoretical results are verified experimentally and compared with the performance of straight tube bubble pump with the same diameter. The results show that when the immersion ratio is less than 0.30 and gas flow rate is 0.05-0.15 g / s, the theoretical value is in good agreement with the experimental value curve. However, The 350 W time-varying cross-section tube bubble pump can enhance the efficiency up to 12.8%. The low driving power provides the possibility for the bubble pump to make full use of the low-grade heat source. The analysis shows that the application of the variable cross-section riser and the improvement of the outlet of the generator are beneficial to improve the performance of the bubble pump and provide a theoretical basis for the optimization design and performance improvement of the bubble pump driven by waste heat of solar energy and industrial waste heat.