GAS TURBINE CYCLE CALCULATIONS: DIFFERENTIAL METHODS IN THE ANALYSIS OF EQUILIBRIUM OPERATION,
Abstract
The equilibrium operation of a simple turbojet engine is analyzed, using logarithmic differential methods to infer performance changes about a design point. A simple method, assuming constant specific heats and ignoring mass addition effects, is compared with a more rigorous analysis where both these effects are considered; it is shown that the computation of fuel flow, at least, should follow the rigorous analysis. The application of the analysis is illustrated by considering the performance response of a turbojet engine as the air flow is reduced. The effects of simple mass flow change and simple compressor efficiency change are considered separately, and superposition to determine the combined result is illustrated. Extensive changes of cycle parameters and component efficiences are shown to have only small changes on engine thrust and sfc response; somewhat stronger effects are associated with changing the engine flight condition. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1967
- Accession Number
- AD0820539
Entities
People
- E. P. Cockshutt
Organizations
- National Research Council Canada