Physics-Based Modeling of Multicomponent Transcritical Phase Change and Spray Breakup in High-Pressu
Abstract
Research Problem: Advanced propulsion and power systems relevant to the US Navy (e.g., future detonation engines and high-power gas-,turbine jet engines) almost always operate under high pressures for high power density and thermodynamic cycle efficiency. Due to th,e high-pressure environment, the injected multicomponent liquid propellants and fuel-air mixtures often go through thermodynamically, transcritical processes during the spray breakup, evaporation, mixing and combustion processes. Transcritical phase change and spra,y breakup are not well-understood and their high-fidelity physics-based modeling is not well-developed (especially for multicomponen,t mixtures), which severely limits the development of new technologies for Navy-relevant propulsion and power systems. Research Obje,ctives: This project targets to develop a united multiphase computational fluid dynamics (CFD) framework, which can accurately predi,ct phase change and interface dynamics of multicomponent mixtures in all thermodynamic regimes (i.e., subcritical, transcritical, an,d supercritical regimes).Technical Approaches: (a) We propose to develop a vapor-liquid equilibrium (VLE)-based CFD solver accelerat,ed by parallel in situ adaptive tabulation (ISAT), which can accurately predict phase change of multicomponent mixtures in any therm,odynamic regime (especially at high-pressure transcritical conditions). (b) We propose to develop a VLE-based phase-field method, wh,ich can accurately predict spray breakup with phase change of multicomponent liquid fuels in any thermodynamic regime (considering t,hickened interface, relaxed surface tension, and nonequilibrium effects). (c) We propose to develop subgrid-scale (SGS) models of sm,all-scale phase separation & turbulence-thermodynamics interactions at high pressures, including SGS models of unresolved droplets/b,ubbles and SGS terms in filtered real-fluid equation of state (EOS) and filtered VLE equations. The proposed approaches will be buil,t upon PI Yangs unique prior works and preliminary results, and hence have a very solid foundation and low risks.Anticipated Outcom,es: The deliverables of this project are the proposed physics-based models, including the accelerated VLE-based CFD solver, the VLE-,based phase-field method, and the SGS models. These models will enable high-fidelity CFD simulations and enhance the physical unders,tanding of transcritical phase change and spray breakup in multicomponent systems.Impact on DoD Capacities: The high-fidelity CFD si,mulations enabled by our proposed research will promote the development of new propulsion and power technologies for long-term natio,nal security needs. For example, based on the simulations, the injectors can be re-designed and the components of liquid fuels can b,e optimized at high operating pressures.This Project Summary/Abstract is Approved for Public Release.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Apr 01, 2022
- Source ID
- N000142212287
Entities
People
- Suo Yang
Organizations
- Office of Naval Research
- Regents of the University of Minnesota
- United States Navy