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The final blade row, the hydraulic turbine, is shown in Figure 27. All the flow from the rotor passes through the turbine. A labyrinth at the base of the hub shroud prevented excessive leakage around the turbine. C. HARDWARE DIMENSIONS A tabulation of the dimension and other pertinent design parameters for each blade row is given in Table I. VI. TEST PROGRAM The test program consisted of two series conducted at different time periods. During the first test series, a conventional inducer, a 60 ° hubless inducer with both long and short spinners, and a 45° hubless inducer with both long and short spinners were each driven directly by an electric motor. A total of 28 cavitating and noncavitating tests were made, and the performance of each inducer was obtained. The second test series was conducted using either the conventional inducer or the 45° hubless inducer with the long spinner. The inducers were powered by a full flow hydraulic turbine drive system. The rotor, which supplies power to the hydraulic turbine, was in turn driven by either the electric motor for steady-state or a GN 2 gas turbine for transient operation. A total of 23 tests was conducted; 16 at steady-state and 7 in transient. A. TEST INSTRUMENTATION The performance of each component (inducers, rotor, and hydraulic turbine) was obtained by using Keil probes at the discharge of each row, as shown in Figure 28. The angle at which the probes were set was determined by the performance prediction. These probes have a wide operating range so that even the off-design flow coefficient measured data are valid. The probes were placed at three radial locations (20%, 50%, 80% of hub to tip radial distance) and the pressure measured external to the pump through drilled passages which connected to the probes. When the inducers were tested separately (top of Figure 28) the probes were located directly downstream. During the later test series, these probes were removed (middle of Figure 28) and the performance of the downstream was rotor calculated by assuming that the inducer head rise was unchanged. This assumption appears valid since the measured rotor performance was unchanged with the two different performing inducers. Overall performance of all components was determined by averaging the measured pressure from the three probes. ing systems: The following types Flows Pressures Temperatures Torque Speeds of sensors were incorporated into the measur- Turbine type flowmeter Strain gage pressure transducer Resistance temperature transmitters Strain gage with slip rings Magnetic coil type 39PDF Image | HUBLESS INDUCER FLOW HYDRAULIC TURBINE INDUCER BOOST PUMP
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