A Method for Predicting the Off-Design Performance of Closed-Brayton-Cycle Engines.
Abstract
The development of a computer program for predicting the off-design performance of closed-Brayton-cycle engines is discussed. The approach to the problem was to modify an existing Navy-developed open-cycle gas turbine engine program. The characteristics of the existing program and the various techniques used in closing the cycle are discussed, along with modification of the existing program subroutines and the development of new program controls. The requirements for modeling the component performance and the mechanical losses associated with a laboratory engine under test are considered. Engine off-design performance predictions obtained by the above method are compared with those of the engine manufacturer. Further comparisons are made between the computed results and those obtained from actual engine test data. Some estimates of the errors associated with the engine data-acquisition system are presented. A discussion of multi-parameter performance mapping is included, and the basis procedure used in developing a four-parameter map of the closed-Brayton-cycle laboratory engine is described. The map obtained by this method is presented and discussed. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1978
- Accession Number
- ADA060008
Entities
People
- David W Taylor
- Donald T. Knauss