lecture_28 - 16.512 Rocket Propulsion Prof Manuel...

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16.512, Rocket Propulsion Prof. Manuel Martinez-Sanchez Lecture 28: Mechanical Design of Turbomachinery Integration and Rotordynamics of Turbo Pumps 1. Integration and Mechanical Components As noted before, turbines and pumps are often mounted on a common shaft. If the oxidizer and fuel have similar densities, their respective pumps can also be on one shaft. This is the case in the MK-3 Atlas and Delta II booster turbopump, which, however, has a geared turbine-pump transmission. The Russian RD-170 takes a further integration step by having a single turbine drive both, fuel and oxidizer pump, all on a single shaft. In addition, these pumps feed not a single thrust chamber, but a cluster of four in the case of the Energia vehicle (Fig 4, Lec. 24). Engines using LH fuel require different speeds for the oxidizer and fuel pumps. The first of these engines, the RL-10, had a single-stage oxygen pump on one shaft, gear driven by a second shaft on which were mounted a 2-stage hydrogen pump and the drive turbine. More recent engines (LE-7, SSME) feature separate shafts for the oxygen and fuel, each carrying its own drive turbine.
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