Accession Number:

ADA277180

Title:

Orbital Transfer Rocket Engine Technology High Velocity Ratio Diffusing Crossover

Descriptive Note:

Final rept. Dec 1983-Dec 1989

Corporate Author:

ROCKWELL INTERNATIONAL CANOGA PARK CA ROCKETDYNE DIV

Personal Author(s):

Report Date:

1992-12-01

Pagination or Media Count:

155.0

Abstract:

High speed, high efficiency head rise multistage pumps require continuous passage diffusing crossovers to effectively convey the pumped fluid from the exit of one impeller to the inlet of the next impeller. On Rocketdynes Orbital Transfer Vehicle OTV, the MK49-F, a three stage high pressure liquid hydrogen turbopump, utilizes a 6.23 velocity ratio diffusing crossover. This velocity ratio approaches the diffusion limits for stable and efficient flow over the operating conditions required by the OTV system. The design of the high velocity ratio diffusing crossover was based on advanced analytical techniques anchored by previous tests of stationary two-dimensional diffusers with steady flow. To secure the design and the analytical techniques, tests were required with the unsteady whirling characteristics produced by an impeller. A tester was designed and fabricated using a 2.85 times scale model of the MK49-F turbopumps first stage, including the inducer, impeller, and the diffusing crossover. Water and air tests were completed to evaluate the large scale turbulence, non-uniform velocity, and non-steady velocity on the pump and crossover head and efficiency. Suction performance tests from 80 to 124 of design flow were completed in water to assess these pump characteristics. Pump and diffuser performance from the water and air tests were compared with the actual MK49-F test data in liquid hydrogen. Orbital transfer vehicle engine, OTV, OTVE, Liquid hydrogen turbopump, Multi-stage pump, Diffuser.

Subject Categories:

  • Pumps, Filters, Pipes, Tubing, Fittings and Valves
  • Jet and Gas Turbine Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE