液态水含量对防冰表面水膜流动换热的影响

为了研究液态水含量对防冰表面水膜流动换热的影响,基于机翼防冰表面水膜及空气相互作用机理,并考虑水膜表面传热传质过程,建立了水膜与空气的流动换热模型,得到溢流水膜及空气边界层流动换热的积分控制方程,通过对比文献试验结果验证了模型的准确性.在此基础上,比较了不同液态水含量条件下防冰表面水膜厚度及主要热流量的分布情况.结果表明:液态水含量对水膜沿表面厚度分布有明显影响,而对换热过程中各项热流的影响主要集中在水滴撞击区域,加热热流与散热热流随液态水含量的增加呈现相反的变化趋势.

Influence of liquid water content on flow and heat transfer of water film on anti-icing surfaces

In order to study the effect of liquid water content on flow and heat transfer of water film on anti-icing surface,amathematical model was developed based on the interaction mechanism of the water film and air boundary layer and considering the massand heat transfer of the water film. Governing equations of water film and air flow in the model were both in integral form. The validation ofthe model was carried out by the comparison between the computation of the model and the measurement data from the reference. On thisbasis,the film thickness and main heat flux distribution on the anti-icing surface under different liquid water contents were compared.Results show that the thickness distribution of the water film is affected obviously by liquid water content while the influence for the heattransfer mainly concentrates on the droplets impingement region. In addition,the opposite trend can be observed in the distributions of theheating heat fluxes and heat losses with liquid water content increasing.