The velocity field of multiple jets-in-crossflow was examined experimentally for various jet hole supply plenum configurations using particle image velocimetry. The jet hydrodynamics are discussed in relation to implications on gas turbine film-cooling applications. The counter-flow plenum case produced desirable in-hole vortices of opposite rotational sense to that of the primary counter-rotating vortex pair (CRVP) in the jet. For this case, the interaction of in-hole vorticity and the CRVP weakened the CRVP, resulting in a lower trajectory and increased spanwise spreading. This is advantageous for film-cooling applications where surface coverage and jet attachment are necessary to prevent hot-gas penetration to the blade or vane surface.
Experiments in Fluids – Springer Journals
Published: Dec 8, 2002
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