Question 144Gas Turbine - Assistant Engineer
70% to passOn the marine gas turbine engine shown in the illustration, the 8th stage bleed air is used for which of the following? Illustration GT-0017
APower turbine balance piston cavity pressurization.
BLube oil sump pressurization and cooling.
CHigh pressure turbine 2nd stage nozzle cooling.
DPower turbine blade cooling.
AI Explanation
The correct answer is B) Lube oil sump pressurization and cooling. The 8th stage bleed air from the marine gas turbine engine is used to pressurize and cool the lube oil sump. This is a common application of the compressor bleed air in turbine engine design. The pressurization helps to circulate the lube oil and prevent oil foaming, while the cooling helps to maintain the proper oil temperature for lubrication and bearing performance. The other answer choices are incorrect because: A) is for the power turbine, not the compressor section; C) is for the high pressure turbine section, not the 8th stage; and D) is for the power turbine blades, not the lube oil system.
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