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Chongwen Jiang

Bio: Chongwen Jiang is an academic researcher from Beihang University. The author has contributed to research in topics: Boundary layer & Supersonic speed. The author has an hindex of 10, co-authored 52 publications receiving 261 citations. Previous affiliations of Chongwen Jiang include China Aerospace Science and Technology Corporation & National Laboratory for Computational Fluid Dynamics.

Papers published on a yearly basis

Papers
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Journal ArticleDOI
TL;DR: In this paper, the influence of heat release by the hydrogen combustion in supersonic turbulent boundary layers is numerically studied using Reynolds-averaged Navier-Stokes equations.
Abstract: Influences of heat release by the hydrogen combustion in supersonic turbulent boundary layers are numerically studied using Reynolds-averaged Navier–Stokes equations. The adopted Reynolds-averaged Navier–Stokes methodology is first validated by comparing the numerical results with the existing experimental data. Studies on the effects of the flame perpendicular position inside the boundary layer reveal that, while the flame is restricted around the edge of the boundary layer, the heat release may slightly reduce rather than increase the wall heat flux because of the suppression effect on the turbulent energy transport due to heat release. However, as the flame moves toward the wall, the skin-friction reduction effect would not be obviously strengthened, but the wall heat flux could be dramatically enhanced by the increase of near-wall chemical reactions. At a given hydrogen mass flow rate, the injection scheme with a higher injection height and a lower injection velocity could be helpful to achieve a larg...

42 citations

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TL;DR: In this article, the authors present an overview on progress and perspectives of the jet impingement research for rocket launching and discuss the interaction of impinging jets with multiphase flows.

31 citations

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TL;DR: In this article, Wang et al. developed a wall function boundary condition for high-speed flows so as to reduce the grid dependence of the simulation for the skin friction and heat flux.
Abstract: In order to develop a wall function boundary condition for high-speed flows so as to reduce the grid-dependence of the simulation for the skin friction and heat flux, a research was performed to improve the compressible wall function boundary condition proposed by Nichols. Values of parameters in the velocity law-of-the-wall were revised according to numerical experiments and the expression of temperature law-of-the-wall was modified based on theoretical analysis and numerical simulation. Besides, the formula of the heat conduction term in near-wall region was derived so that the coupling between the wall function boundary condition and CFD code was realized more accurately. Whereafter, the application study of the modified wall function was carried out. The numerical case of supersonic turbulent boundary layer on a flat plate illustrated that the modified wall function produces reasonable results of skin friction and heat flux, and profiles of velocity, temperature and turbulent eddy viscosity for coarse grids with the initial wall spacing of y+<400, and that the modifications to the original wall function can obviously improve the simulation precision. As for the application of separation flows, it was found from the numerical cases of supersonic cavity flow and hypersonic axisymmetric compression corner that the compressible velocity law-of-the-wall originally established based on the fully-developed attached turbulent boundary layer approximately holds in the near-wall region inside the separation flows, which ensures that reliable skin friction and heat flux can be given by the wall function inside the separation flows, while for the region near separation and reattachment points, the wall function gives results with a relatively large error, because the velocity law-of-the-wall used in the wall function takes on obvious deviation from the real velocity profiles near the separation and reattachment points.

31 citations

Journal ArticleDOI
TL;DR: In this paper, the applicability of the laminar finite rate model and flamelet model for supersonic combustion flows in a Reynolds-averaged Navier-Stokes (RANS) framework was investigated.

27 citations

Journal ArticleDOI
01 Jan 2017
TL;DR: In this paper, two flamelet-type models are developed for supersonic combustion flows, namely the representative interactive flamelet (RIF) model and the flamelet/progress variable (FPV) model, based on a compressible rescaling for the tabulated chemical source term of the progress variable.
Abstract: Two flamelet-type models are developed for supersonic combustion flows. First, the representative interactive flamelet (RIF) model is introduced to fully incorporate the local high-Mach-number effects into the flamelet library, and some algorithms specifically for supersonic flows are designed in the RIF model. Secondly, the flamelet/progress variable (FPV) model is also extended to supersonic combustion flows, based on a new compressible rescaling for the tabulated chemical source term of the progress variable. These two models, together with the steady flamelet (SF) model, are then applied in a supersonic combustion experimental case. Numerical results indicate that the RIF model induces very limited changes on the temperature and major species concentrations compared to the SF model, implying that the species concentrations in the flamelet library are not sensitive to the local high-Mach-number effects. Overall, the RIF model does not show obvious improvement on the simulation accuracy for the studied case. While for the FPV model, the obtained numerical results achieve much better agreements with the experimental data, including the temperature, major species concentrations and auto-ignition position. It is also found that the proposed compressible rescaling for the FPV model reasonably incorporates the high-Mach-number effects on the tabulated chemical source term of the progress variable and effectively improves the simulation accuracy of the FPV model for supersonic combustion flows.

24 citations


Cited by
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李栋, 焦予秦, Igor, Men'shov, 中村佳朗 
01 Jan 2005
TL;DR: In this paper, the authors proposed the Detached-Eddy Simulation (DES) approach and large-scale Eddy Simulation approaches (LES) approaches to simulate the environment.
Abstract: 应用DES(Detached-Eddy Simulation)方法数值模拟了3种不同失速类型的翼型的升力特性.DES方法结合了RANS(Reynolds-averaged Navier-Stokes)和LES(Large Eddy Simulation approaches)的优点.基于Spalart-Allmaras湍流模型,在近壁面DES体现为RANS模型的特点而在远离物面处又具有LES的亚格子模型的特性.对此模型使用了LU-SGS隐式格式求解.通过和实验结果对比,显示这种方法可以有效地预测翼型的失速特性.

187 citations

Journal ArticleDOI
TL;DR: This paper systematically summarizes the aerodynamic research relating to China’s high-speed railway network, and eight future development directions for the field of railway aerodynamics are proposed.
Abstract: High-speed railway aerodynamics is the key basic science for solving the bottleneck problem of high-speed railway development. This paper systematically summarizes the aerodynamic research relating to China’s high-speed railway network. Seven key research advances are comprehensively discussed, including train aerodynamic drag-reduction technology, train aerodynamic noise-reduction technology, train ventilation technology, train crossing aerodynamics, train/tunnel aerodynamics, train/climate environment aerodynamics, and train/human body aerodynamics. Seven types of railway aerodynamic test platform built by Central South University are introduced. Five major systems for a high-speed railway network—the aerodynamics theoretical system, the aerodynamic shape (train, tunnel, and so on) design system, the aerodynamics evaluation system, the 3D protection system for operational safety of the high-speed railway network, and the high-speed railway aerodynamic test/computation/analysis platform system—are also introduced. Finally, eight future development directions for the field of railway aerodynamics are proposed. For over 30 years, railway aerodynamics has been an important supporting element in the development of China’s high-speed railway network, which has also promoted the development of high-speed railway aerodynamics throughout the world.

126 citations

Journal ArticleDOI
TL;DR: In this article, a survey of mixing augmentation mechanisms for the design of large-scale scramjet engines at increased flight Mach number is presented, including wall injection, struts, ramps, cavities, vortex generators and new configurations.

126 citations

Journal ArticleDOI
TL;DR: The paper introduces original categorizations of both the wind blown sand-induced performance deficiencies of the railway systems and the prevention techniques to mitigate the windblown sand effects (Source-Path-Receiver categorization of the Sand Mitigation Measures).

90 citations

Journal ArticleDOI
TL;DR: This paper aims to promote the practical application of the AOSC system which could facilitate the development of the energy-optimized green air/space vehicle.

84 citations