Research Article
Research on Simulation and Performance Optimization of Mach 4 Civil Aircraft Propulsion Concept
Table 7
Ramjet mode optimization scheme (design and cruising point).
| | Ramjet design point | Before optimization | After optimization | Cruising operating point | Before optimization | After optimization |
| | Flight altitude (km) | 25 | 25 | Flight altitude (km) | 25 | 25 | | Flight Mach | 4 | 4 | Flight Mach | 4 | 4 | | Thrust (kN) | 138.3 | 138.4 | Thrust (kN) | 115.0 | 114.9 | | SFC (kg/daN/h) | 2.00 | 1.97 | SFC (kg/daN/h) | 1.98 | 1.908 | | Air mass flow (kg/s) | 208 | 227 | Air mass flow (kg/s) | 228 | 267 | | Outlet temperature of the combustion chamber () (K) | 2000 | 1909 | Outlet temperature of the combustion chamber () (K) | 1730 | 1614 | | Maximum area of (m2) | 2.3 | 2.4 | A8 (m2) | 0.95 | 1.06 | | EINOx (g/kg) | 10.87 | 7.11 | EINOx (g/kg) | 4.97 | 4.74 |
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