Guinzburg, Adiel | Engineering Papers

NASA NTRS2002

Deep Throttle Turbopump Technology Design Concepts

The objective of this project is to increase the throttling range of turbopumps from 30 to 120% of the design value, while maintaining high performance levels. Details are given on wide flow range issues, H-Q characteristics, stall characteristics, energy levels, pressure fluctuations at impeller exit, WFR impeller characteristics, commercial diffuser pumps, slotted or tandem vanes, leading edge characteristics, leading edge models, throat models, diffusion passage models, computational fluid dynamics (CFD) methodologies, and CFD flow cases.

Guinzburg, Adiel↗

NASA NTRS1999

Laser Velocimeter Measurements of the Flow Within a Vane-Island Diffuser

A series of detailed non-intrusive laser velocimeter flow field surveys were performed to validate computational fluid dynamic (CFD) codes for rotating pump components. Three component laser-2-focus (L2F) laser velocimetry was used to acquire data within a flow passage of a diffuser at design flow conditions. The thirteen vane-island type diffuser was designed to allow diffusion in the axial direction. Multiple laser velocimeter surveys were performed throughout several diffuser passages and at multiple diffuser depths (hub to shroud). The axial (3D) component of the velocity at all locations was small. The radial and meridional velocity components nearest the diffuser hub increased in magnitude relative to the flow nearest the shroud as the flow progressed through the diffuser. A continuity check across the diffuser throat and based on the meridional velocity component yielded a match with a facility flow meter of 98.0%.

Ferguson, Thomas V.↗