Heat Transfer, Adiabatic Effectiveness and Injectant Distributions Downstream of Single Rows and Two Staggered Rows of Film-Cooling Holes with Simple and Compound Angles
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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Experimental results for two compound angle injection systemsconfigurations 1 and 3, and for a simple injection system configuration 2 are compared in this thesis. The effects of blowing ratio, spanwise hole spacing, hole angle orientation, and streamwise position xd are discussed in reference to measurements of spanwise-averaged adiabatic effectiveness, iso-energetic Stanton number, and Stanton number 0 approximately equal to 1.5 obtained downstream of both one row of holes and two staggered rows of holes. Results indicate that effectiveness depends mostly on four parameters simple or compound angle injection, spanwise hole spacing, one or two rows of holes, and blowing ratio. Results show that for a specified blowing ratio, for all configurations tested to date, spanwise-averaged adiabatic effectiveness is greatest at lower xd values but decreases with streamwise development as the injectant convected downstream. The rate of spanwise-averaged adiabatic effectiveness decrease is dependent on the blowing ratio, and mostly a result of lift-off of the injectant from the test surface at xd values less than about 20. At larger xd, spanwise-averaged adiabatic effectiveness values generally increase with blowing ratio mostly because of greater amounts of injectant along the test surface. Results also show that the iso-energetic Stanton number ratio lies between 1 and 1.35 for all cases studied and generally increases with blowing ratio for a given xd.