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| 1 | Modeling of finite-size droplets and particles in multiphase flows显示文摘The conventional point-particle approach for treating the dispersed phase in a continuous flowfield is extended by taking into account the effect of finite particle size, using a Gaussian interpolation from Lagrangian points to the Eulerian field.The inter-phase exchange terms in the conservation equations are distributed over the volume encompassing the particle size, as opposed to the Dirac delta function generally used in the point-particle approach.The proposed approach is benchmarked against three different flow configurations in a numerical framework based on large eddy simulation(LES) turbulence closure.First, the flow over a circular cylinder is simulated for a Reynolds number of 3900 at 1 atm pressure.Results show good agreement with experimental data for the mean streamwise velocity and the vortex shedding frequency in the wake region.The calculated flowfield exhibits correct physics, which the conventional point-particle approach fails to capture.The second case deals with diesel jet injection in quiescent environment over a pressure range of 1.1–5.0 MPa.The calculated jet penetration depth closely matches measurements.It decreases with increasing chamber pressure, due to enhanced drag force in a denser fluid environment.Finally, water and acetone jet injection normal to air crossflow is studied at1 atm.The calculated jet penetration and Sauter mean diameter of liquid droplets compare very well with measurements. | Prashant Khare Shanwu Wang Vigor Yang | 2015 | Chinese Journal of Aeronautics2015，28，4： | 3 |
| 2 | A high-fidelity design methodology using LES-based simulation and POD-based emulation:A case study of swirl injectors显示文摘Engineering design is undergoing a paradigm shift from design for performance to design for affordability, operability, and durability, seeking multi-objective optimization. To facilitate this transformation, significantly extended design freedom and knowledge must be available in the early design stages. This paper presents a high-fidelity framework for design and optimization of the liquid swirl injectors that are widely used in aerospace propulsion and power-generation systems. The framework assembles a set of techniques, including Design Of Experiment(DOE), high-fidelity Large Eddy Simulations(LES), machine learning, Proper Orthogonal Decomposition(POD)-based Kriging surrogate modeling(emulation), inverse problem optimization, and uncertainty quantification. LES-based simulations can reveal detailed spatiotemporal evolution of flow structures and flame dynamics in a high-fidelity manner, and identify important injector design parameters according to their effects on propellant mixing, flame stabilization, and thermal protection.For a given a space of design parameters, DOE determines the number of design points to perform LES-based simulations. POD-based emulations, trained by the LES database, can effectively explore the design space and deduce an optimal group of design parameters in a turn-around time that is reduced by three orders of magnitude. The accuracy of the emulated results is validated, and the uncertainty of prediction is quantified. The proposed design methodology is expected to profoundly extend the knowledge base and reduce the cost for initial design stages. | Xingjian WANG Shiang-Ting YEH Yu-Hung CHANG Vigor YANG | 2018 | Chinese Journal of Aeronautics2018，31，9： | 3 |
| 3 | Pressure-coupled vaporization response of n -pentane fuel droplet at subcritical and supercritical conditions显示文摘 | George C. Hsiao Hua Meng Vigor Yang | 2010 | Proceedings of the Combustion Institute2010，，2： | 2 |
| 4 | Recent advances in physical understanding and quantitative prediction of impinging-jet dynamics and atomization显示文摘Impinging-jet injectors are widely used in liquid propulsion applications, since their simple configuration provides reliable and efficient atomization. The flowfield involves a series of complicated spatio-temporal evolutions. Much effort has been directed toward understanding the underlying physics and developing quantitative predictions of impinging-jet atomization. This paper summarizes the recent advances in this direction, including state-of-the-art theoretical, experimental, and numerical studies, along with representative results. Finally, concluding remarks address remaining challenges and highlight modeling capabilities of high-fidelity simulations. | Xiaodong CHEN Vigor YANG | 2019 | Chinese Journal of Aeronautics2019，32，1： | 2 |
| 5 | Dynamics and stability of lean-premixed swirl-stabilized combustion显示文摘 | Ying Huang Vigor Yang | 2009 | Progress in Energy and Combustion Science2009，，4： | 2 |
| 6 | Bifurcation of Flame Structure in a Lean-premixed Swirl-stabilized Combustor: Transition from Stable to Unstable Flame 显示文摘 | Ying Huang Vigor Yang | 2004 | Combustion and Flame2004，，136： | 1 |
| 7 | Effect of Swirl on Combustion Dynamics in a Lean-premixed Swirl-stabilized Combustor 显示文摘 | Ying Huang Vigor Yang | 2005 | Proceedings of the Combustion Institute2005，，30： | 1 |
| 8 | Combustion of bimodal nano/micron-sized aluminum particle dust in air 显示文摘 | Huang Ying Grant A Risha Vigor Yang | 2007 | Proceedings of the Combustion Institute2007，31，： | 1 |
| 9 | A unified treatment of general fluid thermodynamics and its application to a preconditioning scheme显示文摘 | Hua Meng Vigor Yang | 2003 | Journal of Computational Physics2003，，1： | 1 |
| 10 | Adaptive Control of Combustion Instability with On-line System Identification显示文摘 | Shozo Koshigoe Toshihiko Komatsuzaki Vigor Yang | 1999 | Journal of Propulsion and Power1999，15，3： | 1 |
| 11 | Modeling of supercritical vaporization, mixing, and combustion processes in liquid-fueled propulsion systems显示文摘 | Vigor Yang | 2000 | Proceedings of the Combustion Institute2000，，1： | 1 |
| 12 | Dynamics and stability of lean-premixed swirl - stabilized combustion 显示文摘 | Ying Huang Vigor Yang | 2009 | Progress in Energy and Com- bustion Science2009，，35： | 1 |
| 13 | Internal Flow Dynamics in a Valveless Airbreathing Pl,lse Detonation Engine显示文摘 | Fuhua Ma Jeong-Yeol Choi Vigor Yang | 2008 | Journal of Propulsion and Power2008，24，3： | 1 |
| 14 | Liquid-propellant rocket engine injector dynamics显示文摘 | Bazarov V G Yang Vigor | 1998 | Journal of Propulsion Power1998，14，5： | 1 |
| 15 | Dynamics and Stability of Lean- Premixed Swirl-Stabilized Combustion 显示文摘 | Ying Huang Vigor Yang | 2009 | Progress in En- ergy and Combustion Science2009，35，29： | 1 |
| 16 | Liquid Rocket Engine Combustion Instability 显示文摘 | Vigor Yang Anderson W | 1995 | Progress in Astronautics and Aeronautics1995，169，： | 1 |
| 17 | Mitigation of graphite nozzle ero- sion by boundary-layer control in solid rocket motors 显示文摘 | Piyush Thakre Vigor Yang | 2009 | Journal of Propulsion and Power2009，25，5： | 1 |
| 18 | Combustion of micron-sized aluminum particle,liquid water,and hydrogen peroxide mixtures显示文摘 | SUNDARAM Dilip Srinivas YANG Vigor | 2014 | Combustion and Flame2014，161，： | 1 |
| 19 | A model of API HTPB composite propellant combustion in rocket-motor environ- ments显示文摘 | CAI Wei-dong Thakre Piyush YANG Vigor | 2008 | Combustion Science and Technology2008，180，： | 1 |
| 20 | Dynamics and stability of lean-premixed swirl-stabilized combustion显示文摘 | Ying Huang Vigor Yang | 2009 | Progress in Energy and Combustion Science2009，，4： | 1 |
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