Doctor of Philosophy (PhD)
Engineering Science (Interdepartmental Program)
Experimental studies have been performed on two-pass rectangular internal coolant channels with aspect ratio AR 4:1 with high rotation numbers. Three passages are investigated: smooth, 90 deg ribbed and 45 deg ribbed. A maximum Reynolds number of 150,000 and a maximum rotation number of 0.6 are achieved in the study. These maximum parameter values are considerably higher than those previously reported for the 4:1 AR geometry, and provide data for parameter ranges that may be representative of certain modern turbine blades. Heat transfer behaviors with rotation in the three passages are presented. Rotation effects, density effects and buoyancy effects are discussed. Friction factors and thermal performance factors are also provided. In addition, innovative finning strategies are proposed and tested in a straight stationary rectangular channel using transient liquid crystal method aiming to enhance the heat transfer rate of heat exchangers. The test results show an overall heat transfer rate of 3 and above for Reynolds numbers up to 65,000.
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Release the entire work immediately for access worldwide.
Zhou, Fuguo, "Internal cooling in ribbed rectangular (AR=4:1) passages at high rotation numbers and improvement in finning strategies" (2008). LSU Doctoral Dissertations. 2484.