The heat/mass transfer analogy is used to examine the local transport coefficients for two different endwall boundary layer thicknesses and two freestream Reynolds numbers. A linear turbine blade cascade is used in conjunction with a removable endwall plate. Naphthalene (C//1//0H//8) is cast into a mold on the plate and the rate of naphthalene sublimation is determined at 6,000 plus locations on the simulated endwall by employing a computer-aided data acquisition system. This technique allows one to obtain detailed contour plots of the local convection coefficient over the entire endwall. By examining the mass transfer contours, it is possible to infer information on the three-dimensional flow in the passage between the blades. Extremely high transport coefficients on the endwall indicate locations of potential overheating and failure in an actual turbine.
|Original language||English (US)|
|Number of pages||9|
|Journal||American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD|
|State||Published - Dec 1 1987|