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Initial turbine design data presented in table 1 and flow path sketch is presented below.
Table 1
Initial design data
| 1 |
total pressure at inlet |
Pa |
533293 |
| 2 |
total enthalpy at inlet |
J/kg |
1203438 |
| 3 |
total temperature at inlet |
K |
1103 |
| 4 |
stat. pressure at outlet |
Pa |
172000 |
| 5 |
mass flow rate at inlet |
kg/s |
91.91575 |
| 6 |
inlet flow angle in abs frame |
deg |
90 |
| 7 |
isentropic velocity ratio |
- |
0.504 |
| 8 |
capacity |
MW |
22.79 |
| 9 |
total-static pressure ratio |
- |
3.015 |
| 10 |
axial length |
m |
0.42 |
Figure 3. Initial turbine design
Counter-rotating Design (4 stages). Counter-rotating turbine design procedure was performed in
the following way: the vanes of the initial turbine were removed, and the number of stages was kept
in the counter-rotating turbine as in the prototype. We assume that the most correct comparison of
two designs could be made only in this case. In the figure below counter-rotating turbine flow path
obtained after redesign is presented. Blades which are joined to the first and the second shafts are
colored red and purple colors correspondingly.
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