摘要
基于控制容积法和协调一致的求解压力-速度藕合方程的半隐方法(SIMPLEC),采用Realizablek-ε紊流模型对不同孔间距的气膜冷却流场的传热特性进行了数值模拟。通过比较不同孔间距K的冷却效率,得出:K较小时有助于提高中心孔的气膜冷却效率;K越小的射流其射流孔间冷却死区消失的越快,并在中心孔位置附近有较高的冷却效率;气膜的覆盖区域是随着K的增加而增大的,K=2.5与K=2工况的覆盖面积基本相同,K=2则比K=2.5工况拥有更高的气膜冷却效率。
Numerical simulation is performed based on a control volume procedure utilizing to investigate the heat transfer characteristics of aperture ratio, the semi-implicit method for pressure-lined equations consistent （SIMPLE） pressure-velocity coupling arithmetic, using Realizable k-ε turbulence model. The result obtained by comparing the cooling effectiveness of different aperture ratio K shows a smaller K value will help improve the film-cooling effectiveness of centre bore; smaller K value jet flow is, sooner the cooling dead area disappear and there is a high cooling effectiveness around the centre bore; the region of the film coverage is increased with the value of K. The same coverage region can be achieved with K = 2 and K = 2.5, while the cooling effectiveness is higher when K is large.
出处
《东北电力大学学报》
2009年第1期36-39,共4页
Journal of Northeast Electric Power University
关键词
气膜冷却
孔间距
数值模拟
冷却效率
Film cooling
Aperture ratio
Numerical simulation
Cooling effectiveness
