Develop high-fidelity modeling and efficient simulation techniques for supercritical combustion High-Fidelity Modeling and Simulation of Supercritical.

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Presentation transcript:

Develop high-fidelity modeling and efficient simulation techniques for supercritical combustion High-Fidelity Modeling and Simulation of Supercritical Combustion AFOSR Grant No. FA9550-18-1-0216 Vigor Yang, Suresh Menon, and Joseph C. Oefelein 2D DNS LOX/CH4 mixing layer: cold flow (left) and combustion (right) turbulent-chemistry interaction SGS motions real-fluid property evaluation Flamelet-progress variable vs. correlated dynamic chemistry model Computational time SGS modeling FPV FRC Acceleration of real-fluid property evaluation Time Z Therm. Trans. Others Baseline 2.97 ms 28.8% 19.2% 5.5% 46.5% CDE 1.77 ms 10.3% 9.7% 2.3% 77.7% Tabulation 1.45 ms 0.1% 6.9% 2.8% 90.2% reduction in error in filtered density term 𝜺 𝝓 = 𝝓(𝑸 − 𝝓 𝑸 𝝓(𝑸 Baseline: brutal force evaluation; CDE: correlated dynamic evaluation Tabulation: pre-calculated and stored in a library

Vapor-liquid-equilibrium (VLE) framework for super-critical mixing and combustion in LES modeling 3-injector sector LRE: LOX-GCH4 𝑻 𝑳𝒐𝒙 =𝟏𝟏𝟎 𝐊, 𝑻 𝑪𝑯𝟒 =𝟐𝟔𝟎 𝐊 P = 130 bar (supercritical) Resolving near-injection region is difficult due to large density gradients created by non-ideal thermodynamics, and a multi- phase state, not represented by a single EoS. Vapor-liquid Equilibrium is being included into LES and subgrid models Phase fraction 𝜷∈[𝟎,𝟏] identified multi-phase conditions at the interface of the two species. Without accounting for this thermodynamics, unphysical states are obtained 3D TML of 𝑵 𝟐 / 𝑪 𝟔 𝑯 𝟏𝟒 LES-VLE test case 𝑻 𝑵𝟐 =𝟐𝟗𝟖 𝐊, 𝑻 𝑪𝟔𝑯𝟏𝟒 =𝟒𝟕𝟎−𝟔𝟎𝟎 𝐊 P = 50 bar liquid Temperature (left) and Q-criterion with O2 mass fraction (right) gas 15-injector test model for VLE GOX-GCH4 (above) and LOX-GCH4 (planned)

Progression of DNS/LES benchmarks performed using RAPTOR code DNS of liquid n-decane-air jet-in-cross-flow: Re = 100,000 (jet), 620,000 (cross-flow) P = 40 bar (supercritical) DNS of 3D mixing layer designed to emulate an array of methane/LOX streams at conditions relevant to LRE’s in progress on Oak Ridge Summit platform Mixture fraction isosurface (high) Mixture fraction isosurface (low) Vorticity (reveals structure) Scalar dissipation Hybrid-DNS/LES of methane-LOX shear-coaxial and swirl-coaxial injection processes at conditions that match the geometry and operating conditions of the AFRL combustion stability experiment (Wegener, Leyva, Forliti, and Talley, AIAA Paper 2014-0137).