This suppliement presents results obtained in limited tests with 1500F turbine gas inlet temperature. The position of the cooling jet with respect to the disk of the wheel was found to be an important parameter in veil cooling. When the flow of the issuing cooling jet is at the surface of the disk, it provides a high temperature gradient for heat transfer, but it does not induce any considerable mixing with the main gas stream, and thus does not promote a high heat transfer. When the cooling jet is directed at a slight distance from the surface of the disk, there is more cooling gas mixing with the main gas stream, and the effect of this spacing required investigation to provide a sound basis for higher temperature tests of veil cooling effects.
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