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Development of Physics - Based Emission Prediction Model
- 1. Towards the Development of a Preliminary Combustor Design and Sizing Computational Software Part III: Development of Physics Based Emission Model John Melchizedek John Britto Thermal Power MSc, Aerospace Propulsion Option School of Engineering January 2015 Supervisor: Dr. Vishal Sethi Objective Methodology Develop models to approximate the flow characteristic of combustors Integrate flow models and Chemical Reactor Network (CRN) into unified emission model CRN E3 Combustor Emission Model Target Physical Parameters Model Parameters Flow Model Dimension Flow Splits Emission Generalization Experimental DataDevelopment Variable Model Overview Input Jet Penetration Flow Splits Dimension Conclusion Key Reference Recirculation Apeak Flow splits Mixing Length Jet Mixing Radial Growth Fuel Distribution NW I MID I CORE I RECIR I RECIR O CORE O MID O NW O RTDP 0 5 10 15 20 25 30 35 0 0.2 0.4 0.6 0.8 1 1.2 1.4 EmissionIndex fuel flow EI NOx predicted EI NOx actual EI CO predicted EI CO actual A new methodology and emission model was successfully developed Model can be extend to Radially staged combustors and converted into 3D by circumferentially arranging reactors 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0 10 20 30 40 50 60 70 80 90 100 0 0.2 0.4 0.6 0.8 1 1.2 1.4 Length(cm) Radius(%) Fuel flow (kg/s) Model Parameters R peak R growth L mixing Emission Indices Burrus, D.L., et al, “Energy Efficient Engine: Component Development and Integration: Single-Annular Combustor Technology Report”, NASA CR-159695. Tavg NASA CEA 𝜙 𝒎 𝒂 𝒓𝒆𝒈 = 𝒎 𝒇 𝒓𝒆𝒈 𝝓 × 𝑭𝑨𝑹𝑺 Guess 𝑚 𝑎 𝑡𝑜𝑡𝑎𝑙 = 𝑚 𝑎 𝑟𝑒𝑔 Generalization IF Yes IF NO Fuel +Air Fuel Air