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For the compressor, the value of y remains constant, except for a very small variation with temperature, hence the last term may be ignored, y does vary with air-fuel ratio, but its influence on turbine performance is small and is therefore also ignored. Fortunately the Reynolds number (m/jj.D) also has only a small effect on performance and can be ignored. A relationship between rjis, A7/7(91 and Po2/Po\ has already been given (eqns 2.12 and 2.16), hence eqn (2.20) may be reduced to m^ToiR Po,D2

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