Future space missions will require reusable engine platforms which in some instances will necessitate deep-engine throttling thrust capability. This is accomplished through the off-design operation of the engine fuel pumps. At off-design conditions, there are additional losses associated with centrifugal turbopump operation, leading to inefficiencies and poor pump performance. Future turbopump designs will incorporate various design changes/innovations to address these inefficiencies. Therefore a means to accurately evaluate proposed designs over extended operating ranges is required. The Centrifugal Pump Analysis Code (CPAC) provides this means. CPAC is a one-dimensional meanline analysis code which provides design and off-design performance predictions based on pump geometry and operating conditions. CPAC is based on the Loss Isolation Code (LSISO) which was written in the early 1970's for NASA Lewis Research Center. The CPAC user interface is a menu driven treed format with an on-line user manual and user help screens. Several enhancements: * Additional pump elements * Node based modeling scheme * Individual or multiple element analysis * Constant or variable fluid properties * English or SI unit input/output * User-friendly interface incorporating - various input options - online input editting * Graphical output analysis including test data comparison capability along with online help and accompaning user's manual make CPAC a versatile tool for turbopump design performance and evaluation. Based on comparison to experimental test data, the performance prediction of the CPAC code is acceptable from the standpoint that it predicts performance over a wide range of pump speeds and flow rates. It also offers the capability to predict several different pump configurations such as vaneless diffuser pumps, vaned diffuser pumps, volute pumps, single and multistage pumps, including the crossover elements.
Library of Congress Subject Headings
Turbomachines--Evaluation--Data processing; Turbine pumps--Evaluation--Data processing; Centrifugal pumps--Evaluation--Data processing
Department, Program, or Center
Mechanical Engineering (KGCOE)
Knebel, Albert, "A Computational package for the evaluation of centrifugal turbopumps" (1994). Thesis. Rochester Institute of Technology. Accessed from
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