CAJ | 학술논문

为分析单狭缝、双狭缝和四狭缝射流冲击柱状凸形表面的流动换热特性，应用Realizable κ-ε模型对其展开数值研究。通过与实验数据对比验证了数学模型的适用性，比较探讨了单、多狭缝冲击射流的流场分布、边界层分离现象和冲击换热特点。结果表明：单、多狭缝射流冲击柱状凸形表面，气体分别在流动阻力和相邻狭缝射流逆向相遇阻力形成的逆压梯度作用下，发生边界层分离；随流动发展，多狭缝射流在相邻射流逆向相遇作用下，Nu迅速下降至最低值，随后在逆流作用下有所回升；每狭缝具有相同雷诺数Re条件下，当狭缝数目增加时，Re的增加对提高平均努塞尔数Num的效果相对较小，当无量纲曲率半径（D／B）增大时，Num对Re的变化更加敏感，增大Re将有效地增加表面Num；狭缝射流总流量一定时，狭缝数目越多，Num越小，局部努塞尔数Nu分布越均匀。
위분석단협봉、쌍협봉화사협봉사류충격주상철형표면적류동환열특성，응용Realizable κ-ε모형대기전개수치연구。통과여실험수거대비험증료수학모형적괄용성，비교탐토료단、다협봉충격사류적류장분포、변계층분리현상화충격환열특점。결과표명：단、다협봉사류충격주상철형표면，기체분별재류동조력화상린협봉사류역향상우조력형성적역압제도작용하，발생변계층분리；수류동발전，다협봉사류재상린사류역향상우작용하，Nu신속하강지최저치，수후재역류작용하유소회승；매협봉구유상동뢰낙수Re조건하，당협봉수목증가시，Re적증가대제고평균노새이수Num적효과상대교소，당무량강곡솔반경（D／B）증대시，Num대Re적변화경가민감，증대Re장유효지증가표면Num；협봉사류총류량일정시，협봉수목월다，Num월소，국부노새이수Nu분포월균균。
Flow and heat transfer of single-slot jet, double-slot jets and quadric-slot jets impingement to a cylindrical convex surface were numerically investigated by realizable k-ε model. The numerical model was validated through comparison with the experimental data. Flow distribution, boundary layer separation and impingement heat transfer were discussed and compared. The results show that： Boundary layer separation occurs in both of single and multiple-slot jets impingement due to adverse pressure gradient caused by the resistance of flow and reverse encountering of the adjacent slot jets, respectively. With flow development, Nu drops rapidly to the minimum due to the reverse encountering flow in multiple-slot jets and then has a small increase due to the adverse flow. Under the same Re of each slot, the effect of increasing Re is relative small on raising Num when slots number increases. While the effect of Re on Nu,, becomes more sensitive with increasing dimensionless curvature radius（D/B）. Nu,, could be effectively increased by increasing Re under big D/B. Under a constant total flow rate, Num decreases but uniformity of local Nu increases with increasing slots number.