Turbomachinery Performance Analysis for Propulsion Engineers
Analyze turbomachinery performance with thermodynamic calculations and diagnostics
What You Can Do
You can perform quick thermodynamic calculations from engine test data, analyze off-design operating points and surge margins, diagnose failure modes from symptom data, interpret compressor maps, and optimize thermodynamic cycles for mission profiles. This skill lets you validate assumptions, identify efficiency loss root causes, and narrow investigation scope—enabling faster problem-solving than manual spreadsheet work while complementing detailed CFD and design tools.
Features
Extract pressure ratios, efficiency, mass flow, and work from test data in minutes
Assess feasibility and safety margins at non-rated operating conditions
Determine operating line placement, surge margin, and stall risk
Trace symptoms (vibration, temperature rise, efficiency loss) to probable root causes
Evaluate cycle changes and their performance/mission trade-offs
Calculate stability margins and predict compressor behavior
Rapidly evaluate turbomachinery options in early design phases
Generate failure analysis hypotheses and validation frameworks
Example Output
Example 1: Compressor Efficiency Loss Diagnosis
Input: Test data shows 8% drop in polytropic efficiency at 85% design speed, 2°C inlet temperature rise.
Output:
- Primary hypothesis: Fouling or erosion on compressor inlet guide vanes (IGVs)
- Secondary factors: Possible bearing temperature rise reducing blade clearance
- Recommended checks: Borescope inspection, water wash cycle, clearance verification
- Expected recovery: 4–6% efficiency restoration post-cleaning
Example 2: Surge Margin Assessment
Input: High-altitude engine test point—95% N_corrected, 0.58 pressure ratio, 145 kg/s corrected flow.
Output:
- Compressor map position: 89% of stall line (11% margin)
- Safety assessment: Acceptable for cruise, marginal for transient maneuvers
- Recommendation: Limit acceleration rate to 15°F/min or reduce weight by 2,200 kg
Example 3: Cycle Optimization Trade-off
Input: Request to increase turbine inlet temperature (TIT) by 50°C for improved thrust.
Output:
- Pressure ratio requirement: +0.8 (compressor work +12%)
- Specific fuel consumption impact: +1.2% SFC penalty
- Thermal stress increase: +8% on HPT airfoils
- Recommendation: Accept SFC penalty; prioritize cooling system validation before hardware build
What's Included
- SKILL.md instruction file with performance analysis framework and diagnostic methodology:
- Compressor map template: Standard reference sheet for pressure ratio, flow, and efficiency cross-plots
- Off-design analysis checklist: Step-by-step guide for surge margin, stall risk, and operating envelope assessment
- Failure diagnosis workflow: Structured approach linking symptoms to probable causes with validation steps
- Thermodynamic cycle calculator reference: Key equations and parameter definitions for turbomachinery analysis
Who It's For
- Propulsion engineers — Engine design, test, and diagnostics
- Compressor design specialists — Performance optimization and off-design behavior assessment
- Field service/support engineers — Troubleshooting in-service engine issues and efficiency degradation
- Systems engineers — Early-phase cycle analysis and mission-level performance trade-studies
- Failure analysis engineers — Root cause diagnosis and hypothesis validation
Best For
- Engine test data analysis and performance validation
- Compressor surge margin and off-design point assessment
- Turbomachinery failure mode diagnosis from symptom data
- Thermodynamic cycle optimization for mission profiles
- Rapid turbomachinery option comparison during concept development
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