Heat Transfer, Adiabatic Effectiveness and Injectant Distributions Downstream of Single and Double Rows of Film-Cooling Holes with Simple and Compound Angles.
Abstract
Experimental results are presented which describe the development and structure of flow downstream of single and double rows of film cooling holes with both simple and compound angle orientations. Two configurations are investigated, a simple angle injection system in which the injectant is introduced into the freestream parallel to the main flow (as viewed in streamwise/spanwise planes), and a compound angle injection system in which the injectant is introduced with spanwise velocity components. 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. In general, for a given m, for all the configurations tested, effectiveness is greatest at low x/d values, and decreases with increasing x/d. As blowing ratio increases, effectiveness generally decreases, particularly at low x/d values because of lift-off effects. Iso-energetic Stanton number ratios vary between 1. 0 and 1.25 for all cases, and generally increase with increasing blowing ratio at any given x/d. Effectiveness values measured downstream of two rows of holes are higher than values measured downstream of one row of holes. Adiabatic film- cooling effectiveness data for both the compound angle injection system and the simple angle injection collapse with minimal scatter in n/m vs xI/s coordinates.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 28, 1991
- Accession Number
- ADA240743
Entities
People
- Salvatore Ciriello Jr
Organizations
- Naval Postgraduate School