螺旋翅片管空冷器换热与阻力性能研究及优化

Study and optimization on heat exchange and resistance performance of spiral finned tube air coolers

为了获得翅片螺距t、翅片高度h、横向管间距S_(1)和纵向管间距S_(2)对螺旋翅片管束换热与阻力性能的影响,并优化翅片结构,对12组螺旋翅片管束进行数值模拟,并通过模化试验验证。结果表明:t为2.3-2.6 mm时,增大翅片螺距,Nu与Eu都减小;h为9.5-15.5 mm时,增大翅片高度,Nu与Eu都增大;S_(1)为62-72 mm时增大横向管间距,Nu变化幅度很小,但Eu明显减小;S_(2)为53.69-63.69 mm时,增大纵向管间距,Nu与Eu减小的幅度很小;剪裁30°翅片对换热与阻力几乎无影响,但可以节省16.7%的翅片材料。提出了换热与阻力性能关联式,可为其他空冷器的优化提供依据。

In order to study the effects of fin spacing(t),fin height(h),transverse tube pitch(S_(1))and longitudinal tube pitch(S_(2))on flow heat transfer and resistance performance of spiral finned tube bundles,and optimize fin structure,numerical simulation on 12 groups of spiral finned tube bundles was carried out and validation was done through model test.The results indicate that both Nu and Eu decrease with fin spacing increasing at t=2.3-2.6 mm.Both Nu and Eu increase with fin height increasing at h=9.5-15.5 mm.The effect of Nu becomes little when S_(1) increases from 62 mm to 72 mm,but Eu decreases obviously.The changes of Nu and Eu are not obvious with S_(2) increasing from 53.69 mm to 63.69 mm.Cutting 30°on the fins has little effect on heat exchange and resistance,but can save 16.7%of fin material.The correlations for Nu and Eu are put forward,which provides guidance for the optimization of other air coolers.