短距冲击流动下的流型及换热
FLOW PATTERNS AND HEAT TRANSFER OF IMPINGEMENT FLOW
-
摘要: 本文阐述了短距冲击情况下各种流型及相应的各种局部换热特性。对于二维缝射流, 冲击流流型及局部换热特性显著地受射流紊度的发展程度、靶面对射流的反影响以及高射流速度下压缩性等因素的影响, 靶面上局部换热的多峰分布取决于这些因素的发展。而对于圆射流排, 除上述因素外, 尚有射流三维性质的影响, 在短冲击距下流动的三维性导致驻点线两侧局部换热有比二维缝射流更陡峭得多的下降速度。Abstract: The various flow patterns and corresponding various characteristics of local heat transfer of impingement flow are considered for the short distance between nozzle exit and target surface.In the case of the two-dimensional slot jet,the flow patterns and characteristics of local heat transfer are remarkably influenced by these factors such as the degree of turbulance development in jet,the reaction of target surface on the jets and the compressibility of jet at high velocity.The types of multi-peak distribution of local heat transfer on the target surface depend on variation of these factors.For the row of circular jets,besides the above-mentioed factors,the effect of the three-dimensional flow of jets at short distance between nozle exits and target surface,leads to makes the local heat transfer from both sides of the stagnant line drop sharper than that of the two-dimensional slot jet.
点击查看大图
计量
- 文章访问数: 1643
- HTML浏览量: 7
- PDF量: 11
- 被引次数: 0