🔥 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.
⚡ Fortran 90 Engine
Double Precision (IEEE 754)
✓ ISO / ASME Validated
📊 Solver Telemetry
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👁️ Consultations
24
⚡ Calculs faits
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💾 Téléchargements
343
📦 Code Fortran
11.4 KB
📅 Mise en service
Jun 2026
⏱️ Latence
< 1 ms
🔥 Dual-Fluid Gas Turbine & HRSG Steam Injection Manifold
Real-time visual simulation: High-temperature exhaust generating superheated steam injected into combustor for massive power boost📝 Configuration & Presets
✈️ Aeroderivative LM5000 STIG
⚡ Frame 6B Peaker Boost (+50%)
🔥 Cheng Dual-Fluid Cycle (18% Steam)
🏭 Microturbine Distributed CHP
STIG / Cheng Dual-Fluid Formulation:
• Turbine Expansion: Ẇturb = (ṁair · cp,air + ṁsteam · cp,steam) · TIT · [1 − (1/rp)(γ−1)/γ] · ηt
• Power Boost: ΔPnet / Psimple ≈ +40% to +70%
• Steam specific heat (cp,steam ≈ 2.15 kJ/kg·K) is ~2× air, multiplying expansion power.
• Drastic reduction in thermal NOx emissions in combustor.
• Turbine Expansion: Ẇturb = (ṁair · cp,air + ṁsteam · cp,steam) · TIT · [1 − (1/rp)(γ−1)/γ] · ηt
• Power Boost: ΔPnet / Psimple ≈ +40% to +70%
• Steam specific heat (cp,steam ≈ 2.15 kJ/kg·K) is ~2× air, multiplying expansion power.
• Drastic reduction in thermal NOx emissions in combustor.
📊 STIG Performance Results
Configure inputs and click Compute to view results.
📘 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.