颗粒物沉积与平板气膜冷却耦合效应的数值研究  

Numerical study on coupling effects of particle deposition andfilm cooling over flat plate surfaces

作　　者：伍赫 郝子晗 杨星[1,2] 丰镇平[1,2] WU He;HAO Zihan;YANG Xing;FENG Zhenping(School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China;Shaanxi Engineering Laboratory of Turbomachinery and Power Equipment,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安交通大学能源与动力工程学院,西安710049 [2]西安交通大学陕西省叶轮机械及动力装备工程实验室,西安710049

出　　处：《航空动力学报》2024年第5期107-118,共12页Journal of Aerospace Power

基　　金：国家自然科学基金(51906185);中国博士后科学基金会“博士后创新人才支持计划”(BX20180284)。

摘　　要：基于颗粒物沉积模型与动网格技术,研究了不同冷气质量流量比与颗粒物直径下气膜冷却平板表面的沉积特性及颗粒形成沉积物后对平板气膜冷却性能的影响。结果表明:在颗粒速度较低时,冷气射流对颗粒的吹拂作用使其难以在气膜孔下游沉积,且冷气射流结构对颗粒的阻隔与卷吸作用使得气膜孔下游两侧形成明显的脊状沉积带;平板表面的沉积效率随颗粒直径的变化呈现双峰分布;在较大的质量流量比下,冷气射流两侧拢起的脊状沉积带会使得气膜冷却效率显著提高,相比沉积前最大提升了6.15%;同时,颗粒沉积物能增强冷气的横向扩散,使得横向平均冷却效率有一定程度的提升。总体而言,颗粒沉积物对气膜冷却性能的影响由沉积分布特征与沉积量共同决定。Using a particle deposition model and a dynamic mesh technique,the deposition characteristics over a flat plate surface with film cooling under different mass flow ratios and particle sizes were studied.In addition,the effects of particle deposition on film cooling over the flat plate were investigated.Results revealed that at a low particle velocity,the blowing of the coolant acting on the particles made it difficult to deposit in the downstream region of film holes,and an obvious ridged shape of deposits was formed on both sides due to the blocking and entrainment of the cooling jet.However,distribution of the capture efficiency presented a bimodal pattern with the change of particle sizes.At high mass flow ratios,the ridged deposition significantly improved the cooling effectiveness,which was 6.15%higher than that before deposition.Additionally,particle deposition could enhance the lateral spreading of the coolant and improved the laterally-averaged cooling effectiveness.In general,the effects of particle deposition on film cooling performance were determined by both distribution characteristics and thickness of the deposition.

关 键 词：颗粒物沉积 气膜冷却 冷气质量流量比 斯托克斯数 动网格 

分 类 号：V231.1[航空宇航科学与技术—航空宇航推进理论与工程]