Presentation on theme: "Finite Element Modeling and Simulation of the Effect of Water Injection on Gas Turbine Combustor NO x Emissions and Component Temperature Joseph M. Basile."— Presentation transcript:
Finite Element Modeling and Simulation of the Effect of Water Injection on Gas Turbine Combustor NO x Emissions and Component Temperature Joseph M. Basile Master’s Thesis 11/14/2014 Professor S. Bose Professor E. Gutierrez-Miravete Professor N. Lemcoff Rensselaer Polytechnic Institute
2 Water Injection and NO x Nitrous Oxides (NO x ) are a byproduct of gas turbine engine operation, and are considered harmful pollutants Reducing NO x emissions is the subject of contemporary research Most research focuses on methods that achieve the greatest reduction in emissions with the least impact to performance Water injection is perhaps the most studied and most effect means of reducing NO x What other benefits can water injection have?
3 Water Injection High combustion temperature can wear or damage engine components Like air cooling and high temperature coatings, liquid water injection into the engine could protect components from heat related damage while simultaneously reducing NO x emissions NO x emissions are highest when the temperature is highest J85-GE-17A turbojet
4 Engine Modeling 3D model created from a description of a research engine from University of Padova, Italy Engine interior from compressor outlet to turbine inlet, including the combustion chamber, were modeled and simulated A 2D axisymmetric model was created for initial simulations Boundary conditions and lessons learned were used to create a 3D model of 1/12 of engine
5 2D Axisymmetric Model Airflow Region Airflow Inlet Combustion Chamber Combustion Region Fuel Injector Combustor Outlet Water Injection Inlet Water Evaporation Region Axis of Revolution
6 Boundary Conditions Simulation Number Backpressure (Pa) Air Flow (kg/s) Fuel Pressure (Pa) Fuel Flow Rate (kg/s) Water Pressure (Pa) Water Flow (kg/s) Target0.530.0072610.013533 13955000.505723957360.002474017000.01147 23950000.51473957360.00554017000.01259 33941480.529823957360.010654017000.01448 43941480.530273954000.008524017000.01453 53941480.530533952000.007254017000.01457 63941480.530713952000.007264015000.01391 73941480.530813952000.007264013860.01353
11 3D Model Results Average Combustor Exit Temperature – Without water injection: 1037.49 K – With water injection: 919.054 K NO x Production – Without water injection: 3.015E-5 kg/s – With water injection: 4.564E-6 kg/s – 84.86% reduction in NO x emissions Inner wall surface temperature – Without water injection: 400-800 K – With water injection: ~373 K – Wall temperature of around ~370 – 380 K was maintained along the inner wall due to the evaporation of water droplets