Turbopumps

The assembly of a turbine with one or more pumps is called a turbopump. Its purpose is to raise the pressure of the flowing propellant. Its principal subsystems are a hot gas powered turbine and one or two propellant pumps. It is a high precision rotating machine, operating at high shaft speed with severe thermal gradients and large pressure changes, it usually is located next to a thrust chamber, which is a potent source of noise and vibration.

This turbopump feed system and its several cycles have been discussed in Section 6.6 and Fig. 6-2 categorizes the various common turbopump configurations. Turbopumps or installation of turbopumps in rocket engines are shown in Figs. 1-4, 6-1, 6-12, 8-19, 10-1, 10-2, 10-3, and 10-11; they are discussed in Refs. 6-1 and 10-1. A schematic diagram of different design arrangements of pumps and turbines for common turbopump types can be seen in Fig. 10-4. Table 10-1 shows lists parameters of pumps and turbines of two large rocket engines.

Specific nomenclature and terminology used in the next few paragraphs will be explained later in this Chapter. In Fig. 10-1 a simple turbopump with a

TABLE 10-1. Turbopump Characteristics

Engine'. Space Shuttle Main Engine" LE-7*

Feed System Cycle: Modified Staged Combustion Cycle Modified Staged Combustion Cycle

Propellants: Liquid Oxygen and Liquid Hydrogen Liquid Oxygen and Liquid Hydrogen

Pumps

Designation'

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