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gas-turbine-cycle skill

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This skill performs comprehensive gas turbine cycle analysis for turbofan, turbojet, and turboprop designs, enabling optimization and off-design performance.

npx playbooks add skill a5c-ai/babysitter --skill gas-turbine-cycle

Review the files below or copy the command above to add this skill to your agents.

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SKILL.md

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---
name: gas-turbine-cycle
description: Expert skill for gas turbine engine thermodynamic cycle analysis and optimization
allowed-tools:
  - Read
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  - Glob
  - Grep
  - Edit
  - WebFetch
  - WebSearch
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metadata:
  version: "1.0"
  category: aerospace-engineering
  tags:
    - propulsion
    - gas-turbine
    - thermodynamics
    - cycle-analysis
---

# Gas Turbine Cycle Analysis Skill

## Purpose
Provide comprehensive gas turbine engine thermodynamic cycle analysis capabilities for turbofan, turbojet, and turboprop engine design and optimization.

## Capabilities
- NPSS and GasTurb model setup and execution
- Component matching and off-design analysis
- Turbofan, turbojet, turboprop configuration
- Performance map generation and interpolation
- Bleed and power extraction modeling
- Transient performance analysis
- SFC optimization studies
- Engine inlet and nozzle integration

## Usage Guidelines
- Select appropriate component models based on engine configuration
- Validate component maps against available test data
- Consider off-design performance across the flight envelope
- Account for bleed and power extraction in system-level analysis
- Optimize cycle parameters for specific mission requirements
- Document assumptions and limitations for each analysis

## Dependencies
- NPSS (Numerical Propulsion System Simulation)
- GasTurb
- MATLAB

## Process Integration
- AE-004: Gas Turbine Cycle Analysis

Overview

This skill provides expert gas turbine engine thermodynamic cycle analysis and optimization for turbofan, turbojet, and turboprop configurations. It focuses on end-to-end cycle modeling, off-design performance, and system-level effects such as bleed and power extraction. The goal is to enable robust performance predictions and targeted specific fuel consumption (SFC) improvements for mission profiles.

How this skill works

The skill sets up and executes detailed cycle models using component maps and simulation tools, supporting NPSS and GasTurb model formats. It performs component matching, off-design interpolation of performance maps, transient simulations, and SFC optimization across flight envelopes. Results include performance tables, maps, and sensitivity data for inlet, core, turbine, and nozzle integration decisions.

When to use it

Preliminary and detailed design of turbofan, turbojet, or turboprop engines
Evaluating off-design performance across altitude and throttle schedules
Optimizing cycle parameters to reduce SFC for a given mission profile
Assessing the impact of bleed, shaft power extraction, or accessory loads
Generating performance maps and interpolants for system integration

Best practices

Select component model fidelity to match available data and analysis goals
Validate component maps and model outputs against test data where possible
Perform off-design scans across the full flight envelope, not just design points
Document assumptions, boundary conditions, and limitations for each study
Include sensitivity studies for key parameters (inlet losses, turbine cooling, bypass ratio)

Example use cases

Configure a turbofan cycle and optimize fan pressure ratio and bypass ratio to minimize SFC for a 2-hour mission
Run off-design analysis to predict thrust and temperatures during climb and cruise profiles
Model bleed extraction for environmental control and anti-ice systems and quantify SFC penalty
Perform transient spool-down/spool-up simulations for engine restart and surge margin assessment
Create interpolated performance maps for use in aircraft-level flight simulation

FAQ

Which simulation tools are supported?

Primary support is for NPSS and GasTurb model workflows; MATLAB is used for pre/post-processing and optimization scripting.

How do I account for accessory loads and bleed?

Model bleed and power extraction explicitly as mass and power sinks in the cycle, and include them in off-design and optimization runs to capture system-level impacts.