Our new work has demonstrated the impingement cooling of a flat plate by multiple asymmetric orifice jets, which mimics the internal cooling for a gas turbine blade at its leading edge. Newly found aspects are; the jets applied internally at the leading edge of a gas turbine blade are non-axisymmetric, skewed relative to each of the orifice holes’ axis, and have crescent-moon-like potential cores. As a result, the jets caused non-symmetric local heat transfer distribution on a flat plate due to the jets’ skewness and the unique potential cores. In addition, the jets were found have faster mixing and longitudinal decay of momentum than symmetric jets discharged from conventional nozzles or flat orifices, which lead to better cooling within short jet exit-to-target distance.
This work has been published as C.Y. Zhang, Y.Y. Liu, T.I. Bhaiyat, S.W. Schekman, T.J. Lu, T. Kim, “Impingement cooling by multiple asymmetric orifice jets,” J. of Heat Transfer – The Transactions of the ASME 144(4): 042301-1-13.(https://doi.org/10.1115/1.4053330).
PDF: 
Impingement cooling by multiple asymmetric orifice jets.pdf
