Page 128 - Mechanical Engineer's Data Handbook

THERMODYNAMICS AND HEAT TRANSFER 117

3.8.1 Simple cycle

Pz P3
Comnrensinn rg tin r = - = -
. ...
~
P1 P4 I //

1

Simple cycle with isentropic eficiencies and
C =compressor variable specijc heats
CC = wmbustion chamber tubine

T (cP = specific heat for turbine
cccp = specific heat for combustion chamber
yc = ratio of specific heats for compressor
yl =ratio of specific heats for turbine
qc = isentropic compressor efficiency
ql = isentropic turbine efficiency
4.

J
1

s

Heat supplied Q =c,T,(t-c) per kg of air I
Work done =Turbine work out -Compressor work in I 1
W=cpT1 [I( 1 -f)-(.- l)] I s

Work done = Turbine work out - Compressor work in
1
Efficiency 9 = 1 --
C

Heat supplied Q = ==cP T3 - TI - (Tz-T1)] per kg of air
~
vc
Net work out W
-
Work ratio= -
Gross work lcp( T3 - T,)ql
W
Efficiency q = -
Q