brooksjg
I now have an answer for one type of (high bypass) engine: the air can be 650 to 700 C degrees. This vould be relevant to any discussion about VA going through the engine core, since this is quite close to the suggested melting point of the ash and therefore the ash could at least in theory block the cooling holes in a liquid state. This is presumably more problematic than considering blockages due to solid, very small particles.
Can you provde more support, link, personal experience, etc. that suggest that the melting point of VA is "quite close" to the cooling air temperature of 650-700 C degrees in a turbine blade?
I don't recall that there is any documented cases of melted VA inside a turbine blade