Yes,I figured it was a typo-Wouldn't want to be around a washer that spins at 8,000RPM thats unbalanced!!!
And yes as JohnB300m points out turbine blades are cooled with compressor bleed air.On very RARE occasions this fails with bad things happening!For the most part gas turbines are VERY reliable engines!!
Never heard of refrigerants cooling turbine blades-at the temps the blades operate at the refrigants would break down to toxic and corrosive gases.The bleed air method is the most used.The cooling system with refrigerants would add considerable weight-say for aircraft.For aircraft the engine has to be lightweight as possible.Good reason why many engines had compressed air starters-the electric motor and battery supply required would be too heavy.Newer generation engines can be electically started.Hence in the older days why "start carts" were used.
