Hi everyone,
After working on both heavy duty and aeroderivative gas turbines and being aware of the major differences of the control theory of both, I have some questions about the mechanical side of the aeroderivative GT.
I know that (correct me if i am wrong) the Aero GT shaft is much lighter than the HD, and the power output is a mix of low torque and high speed comparing to HD, but i want to understand the bearing types of Aero GT. the Gas Generator GG can achieve 10000rpm and for that we used a different type of oil (synthetic oil) for lubrication. we have roller bearings for journal bearing, and the thrust load is carried by the ball bearings, how is that?, how can we achieve those high speeds with those bearings? is the oil wedge still there?
My second question is according to the control theory and the auxiliary system, we do not have an electrical lube pump. we do have only a lube pump in the gear box combined with the scavenge pumps, and in the same time the synthetic oil tank is mounted on a high level. is this has a relationship with not having an electrical pump (means when the GT is stopped the bearing or sumps are always drown in oil?), during the cooldown the hot oil does not need a circulation? a fixed residence time in the bearing?
Thanks in advance
After working on both heavy duty and aeroderivative gas turbines and being aware of the major differences of the control theory of both, I have some questions about the mechanical side of the aeroderivative GT.
I know that (correct me if i am wrong) the Aero GT shaft is much lighter than the HD, and the power output is a mix of low torque and high speed comparing to HD, but i want to understand the bearing types of Aero GT. the Gas Generator GG can achieve 10000rpm and for that we used a different type of oil (synthetic oil) for lubrication. we have roller bearings for journal bearing, and the thrust load is carried by the ball bearings, how is that?, how can we achieve those high speeds with those bearings? is the oil wedge still there?
My second question is according to the control theory and the auxiliary system, we do not have an electrical lube pump. we do have only a lube pump in the gear box combined with the scavenge pumps, and in the same time the synthetic oil tank is mounted on a high level. is this has a relationship with not having an electrical pump (means when the GT is stopped the bearing or sumps are always drown in oil?), during the cooldown the hot oil does not need a circulation? a fixed residence time in the bearing?
Thanks in advance