๐ฅ Steam-Injected Gas Turbine (STIG / Cheng)
Calculate Steam-Injected Gas Turbine (STIG / Cheng cycle) performance: power boost gain (+40-70%), thermal efficiency, HRSG steam duty, and turbine expansion.
โก Fortran 90 Engine
Double Precision (IEEE 754)
โ ISO / ASME Validated
Thermodynamics
๐ Solver Telemetry
โ ACTIVE
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24
โก Solves
18
๐พ Downloads
461
๐ฆ Fortran Code
11.4 KB
๐
Released
Jun 2026
โฑ๏ธ Latency
< 1 ms
๐ฅ Dual-Fluid Gas Turbine & HRSG Steam Injection Manifold
Real-time visual simulation: High-temperature exhaust generating superheated steam injected into combustor for massive power boost๐ Configuration & Presets
โ๏ธ Aeroderivative LM5000 STIG
โก Frame 6B Peaker Boost (+50%)
๐ฅ Cheng Dual-Fluid Cycle (18% Steam)
๐ญ Microturbine Distributed CHP
STIG / Cheng Dual-Fluid Formulation:
โข Turbine Expansion: Wฬturb = (แนair ยท cp,air + แนsteam ยท cp,steam) ยท TIT ยท [1 โ (1/rp)(ฮณโ1)/ฮณ] ยท ฮทt
โข Power Boost: ฮPnet / Psimple โ +40% to +70%
โข Steam specific heat (cp,steam โ 2.15 kJ/kgยทK) is ~2ร air, multiplying expansion power.
โข Drastic reduction in thermal NOx emissions in combustor.
โข Turbine Expansion: Wฬturb = (แนair ยท cp,air + แนsteam ยท cp,steam) ยท TIT ยท [1 โ (1/rp)(ฮณโ1)/ฮณ] ยท ฮทt
โข Power Boost: ฮPnet / Psimple โ +40% to +70%
โข Steam specific heat (cp,steam โ 2.15 kJ/kgยทK) is ~2ร air, multiplying expansion power.
โข Drastic reduction in thermal NOx emissions in combustor.
๐ STIG Performance Results
Configure inputs and click Compute to view results.
๐ Calculation Methodology & STIG Standards
Dual-Fluid Expansion Principle
Injecting superheated steam increases mass flow and specific heat ($c_{p,steam} \approx 2.15\,\text{kJ/kg}\cdot\text{K}$) across turbine expanders without demanding additional compressor parasitic power.
Single-Shaft Simplicity
Achieves combined-cycle-class efficiency ($\eta \approx 45 - 50\%$) without the capital complexity of a separate steam turbine, condenser, cooling tower, and vacuum system.
Key Engineering Assumptions
- Superheated steam injected at $P_{inj} > 1.15 P_{comp}$.
- Ideal gas mixture thermodynamics for exhaust products + steam.
- Applicable to aeroderivative turbines, peaker power stations, and industrial cogeneration.