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Gas Leakage VS Fitting Tolerance

Gas Leakage VS Fitting Tolerance

(OP)
Hi engineers,

My question is about the relation between gas leakage between shaft and hole clearance and tolerance of fitting. I am working on upgrade of a gas turbine by enabling one stage of its stator vanes to rotate. The vanes will rotate around their axis by means of a mechanism. The problem is that each vane ,in original design, has a passage going through its core axis and delivered the air to the center part of the turbine, but in the rotating config air can not be fed to the vane easily.

I thought about feeding air to a slot on the hole surface ,which the vane shaft is supported, and a hole on the shaft to intake the air. so, the air will be fed to the vane. This design may cause high leakage of the air due to loose fitting between the vane shaft and the hole. A tight fitting can not be used because the shaft has to rotate. If I had a measure, standard or some formulas to help me to calculate the leaking air, I would be able to design the system confidently or compensate the leaking air with more air.

I seek your advise on the calculation of leaking air or any alternative ideas to feed cooling air to the rotating vane.

Thank you in advance,

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