Performance Criteria of Gas‐Turbine Combustion Chambers: A Method of Comparison and Selection for the Designer

Abstract

Typical performance data for combustion chambers with separate introduction of fuel and air have already been presented in FIG. 1. Comparison with FIG. 7, typical of one‐stream chambers, reveals some important differences. Firstly, the data are neither confined within the inflammability limits nor have their peak at the stoichiometric O.F.A.R.; the shift is usually towards the weak side. Secondly, the ratio of the maximum O.F.A.R. to minimum O.F.A.R. of a given curve may be many times the corresponding range of a one‐stream chamber. Thirdly, the curves do not all terminate at substantially the same value of combustion efficiency. Particularly the second of these features is of great practical importance, for, in gas turbines, combustion chambers are required to cope with a very wide range of O.F.A.R. and must maintain a high efficiency throughout this range. The possibility of designing for a wide O.F.A.R. range is one of the reasons for using a two‐stream in preference to a one‐stream chamber. Some of the design features influencing O.F.A.R. range will be discussed below.

Citation

Spalding, D.B. (1956), "Performance Criteria of Gas‐Turbine Combustion Chambers: A Method of Comparison and Selection for the Designer", Aircraft Engineering and Aerospace Technology, Vol. 28 No. 5, pp. 168-172. https://doi.org/10.1108/eb032693