Transcritical diffuse-interface hydrodynamics of propellants in high-pressure combustors of chemical propulsion systems

Jofre, L.; Urzay, Javier

doi:10.1016/j.pecs.2020.100877

Cited by 68 publications

(37 citation statements)

References 148 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Interest in the behavior of supercritical fluids is not new, dating back to at least 1869 [13]. Over the past few decades, researchers have conducted several studies to better understand the dynamics of multiphase flows in this regime [5,6,[8][9][10][11][12][14][15][16].…”

Section: Review On Supercritical Fluids and Transcritical Injectionmentioning

confidence: 99%

See 1 more Smart Citation

Towards Understanding the Structure of Subcritical and Transcritical Liquid–Gas Interfaces Using a Tabulated Real Fluid Modeling Approach

et al. 2021

View full text Add to dashboard Cite

A fundamental understanding and simulation of fuel atomization, phase transition, and mixing are among the topics researchers have struggled with for decades. One of the reasons for this is that the accurate, robust, and efficient simulation of fuel jets remains a challenge. In this paper, a tabulated multi-component real-fluid model (RFM) is proposed to overcome most of the limitations and to make real-fluid simulations affordable. Essentially, a fully compressible two-phase flow and a diffuse interface approach are used for the RFM model, which were implemented in the CONVERGE solver. PISO and SIMPLE numerical schemes were modified to account for a highly coupled real-fluid tabulation approach. These new RFM model and numerical schemes were applied to the simulation of different fundamental 1-D, 2-D, and 3-D test cases to better understand the structure of subcritical and transcritical liquid–gas interfaces and to reveal the hydro-thermodynamic characteristics of multicomponent jet mixing. The simulation of a classical cryogenic injection of liquid nitrogen coaxially with a hot hydrogen jet is performed using thermodynamic tables generated by two different equations of state: Peng–Robinson (PR) and Soave–Redlich–Kwong (SRK). The numerical results are finally compared with available experimental data and published numerical studies with satisfactory agreement.

show abstract

Section: Review On Supercritical Fluids and Transcritical Injectionmentioning

confidence: 99%

“…This class of two-phase flows is known as transcritical injection [1][2][3][4][5][6][7][8][9][10][11][12][13]. A fundamental understanding and simulation of such transcritical flows are among the topics researchers have been struggling with for decades.…”

Section: Introductionmentioning

confidence: 99%

Towards Understanding the Structure of Subcritical and Transcritical Liquid–Gas Interfaces Using a Tabulated Real Fluid Modeling Approach

et al. 2021

View full text Add to dashboard Cite

show abstract

“…The interfacial energy contribution is scaled by the capillary coefficients κ ij , which, similar to surface tension, is dominantly a function of temperature. In this paper, we employ a diffuse-interface model that is derived from LGT [7,8]. The governing equations are…”

Section: Mathematical Modelmentioning

confidence: 99%

“…In this paper, we developed a diffuse-interface method for capturing the unsteady behavior of liquid-vapor interface during transcritical evaporation. Specifically, we employ an unsteady diffused-interface model derived from LGT [7,8] to simulate the nanoscale transcritical evaporation process of Dodecane/Nitrogen. The thermodynamic condition is such that the pressure is supercritical for both species and temperature is supercritical for Nitrogen.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analyses of Transcritical Evaporation using Diffuse-Interface Method

Ihme

2021

ICLASS

View full text Add to dashboard Cite

Liquid fuel placed in a supercritical environment (with respect to the fuel's critical properties) can undergo different evaporation processes that is determined by the droplet's surface temperature T s in comparison with the critical mixing temperature T c . In the transcritical regime, the ambient condition is such that at initial time, T s < T c , a sharp liquid-vapor interface exists, and evaporation occurs at subcritical condition. Eventually, the surface temperature approaches the critical mixing temperature, and the evaporation process becomes supercritical, with no distinct liquid-vapor interface. Traditional methods for simulating this complex evaporation behavior employ separate formulations for the liquid and vapor phases during subcritical evaporation and a continuous formulation during supercritical evaporation. Here, we developed a holistic formulation for the simulation of transcritical evaporation that is valid for both sub-and super-critical evaporation regimes using a diffuse-interface method derived from Linear Gradient Theory. The formulation allows for direct modeling of surface tension and interface thickness during the process of interface thickening as T s → T c . The diffuse-interface model was employed in simulations of a nanoscale transcritical planar evaporation configuration. Furthermore, the ability of the diffuse-interface model to resolve both macroscale fluid behavior and nanoscale liquid-vapor interface structure was demonstrated.

show abstract

“…Indeed, it can not be determined from a priori-analysis whether the spatiotemporal evolution of the involved thermodynamic states is subcritical or supercritical during the entire fuel injection event. As a matter of fact, both subcritical and supercritical regimes may exist simultaneously, as discussed by [5,1]. Thereby, two-phase flow models that can handle such multi-component mixtures accurately and robustly are required for further development of DFICE.…”

Section: Introductionmentioning

confidence: 99%

A tabulated real-fluid modeling approach applied to renewable dual-fuel evaporation and mixing

Gaballa

Jafari

Di-Lella

et al. 2021

ICLASS

View full text Add to dashboard Cite

The substitution of diesel by cleaner renewable fuels such as short-chain alcohols in dual-fuel internal combustion engines is considered an attractive solution to reduce the pollutant emissions from internal combustion engines. In this context, accurate and robust two-phase flow models taking into account the real fuel thermodynamics are required to predict the phase change and mixing processes when various fuels are injected in sub-transcritical conditions. The present study proposes an efficient Real-Fluid model (RFM) based on a two-phase fully compressible four-equation model under mechanical and thermal equilibrium assumptions and closed by a thermodynamic equilibrium tabulation approach. Compared to previous research limited to binary mixtures tabulation, the proposed tabulation approach can further handle ternary mixtures using four-dimensional (4D) tables. In this article, the RFM model has been applied to compare the evaporation and mixing of n-dodecane droplets in single and bi-component ambient. For the single component nitrogen ambient, the numerical results compare well with recent experiments. Finally, n-dodecane droplets evaporation in a bi-component (nitrogen and methanol) ambient relevant to dual-fuel engines have been explored using the Cubic Plus Association (CPA) equation of state. It was found that the initial presence of methanol in the ambient strongly accelerates the mixing process.

show abstract

Transcritical diffuse-interface hydrodynamics of propellants in high-pressure combustors of chemical propulsion systems

Cited by 68 publications

References 148 publications

Towards Understanding the Structure of Subcritical and Transcritical Liquid–Gas Interfaces Using a Tabulated Real Fluid Modeling Approach

Towards Understanding the Structure of Subcritical and Transcritical Liquid–Gas Interfaces Using a Tabulated Real Fluid Modeling Approach

Numerical Analyses of Transcritical Evaporation using Diffuse-Interface Method

A tabulated real-fluid modeling approach applied to renewable dual-fuel evaporation and mixing

Contact Info

Product

Resources

About