Numerical investigation on influence of diamond shaped strut on the performance of a scramjet combustor

Suneetha, Lakka; Randive, Pitambar; Pandey, Krishna Murari

doi:10.1016/j.ijhydene.2019.01.187

Cited by 34 publications

(7 citation statements)

References 72 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As discussed in several studies (Suneetha et al , 2019; Yan et al , 2019; Zhang et al , 2020; Gerlinger et al , 2008; Kim et al , 2004), combustion efficiency can be calculated by comparing the fuel mass flow rate at every stream wise cross-section to the fuel mass flow rate at the jet inflow and defined as: where m ̇ fuel,x is local fuel mass flow rate. When the combustion efficiency is defined via equation (16), the mixing and fuel burning rate are better pronounced and quantified.…”

Section: Resultsmentioning

confidence: 99%

LES/FMDF of turbulent reacting jet in cross-flow

Esmaeili

Afshari

2020

HFF

View full text Add to dashboard Cite

Purpose This study aims to numerically investigate the flow features and mixing/combustion efficiencies in a turbulent reacting jet in cross-flow by a hybrid Eulerian-Lagrangian methodology. Design/methodology/approach A high-order hybrid solver is employed where, the velocity field is obtained by solving the Eulerian filtered compressible transport equations while the species are simulated by using the filtered mass density function (FMDF) method. Findings The main features of a reacting JICF flame are reproduced by the large-eddy simulation (LES)/FMDF method. The computed mean and root-mean-square values of velocity and mean temperature field are in good agreement with experimental data. Reacting JICF’s with different momentum ratios are considered. The jet penetrates deeper for higher momentum ratios. Mixing and combustion efficiency are improved by increasing the momentum ratio. Originality/value The authors investigate the flow and combustion characteristics in subsonic reacting JICFs for which very limited studies are reported in the literature.

show abstract

Section: Resultsmentioning

confidence: 99%

LES/FMDF of turbulent reacting jet in cross-flow

Esmaeili

Afshari

2020

HFF

View full text Add to dashboard Cite

show abstract

“…The computational study of the strut-based scramjet combustor model is performed using ANSYS FLUENT commercial software. In this study, the two-dimensional compressible Reynolds Averaged Navier Stokes (RANS) equation along with a densitybased double precision solver was used to resolve the governing equations [16]. The significance of the RANS equation is that it is capable of providing accurate results even with coarse meshes and resolves the steady flow equations much more easily than other models [46].…”

Section: Methodsmentioning

confidence: 99%

“…A robust flame holding mechanism is needed owing to the short residence time of airflow in the scramjet combustor. There are various injection and flame holding mechanisms, such as cavities [4][5][6][7][8][9][10], pylons [11][12][13][14] and struts [15][16][17][18][19][20][21][22][23][24][25][26][27][28]. The combinations of the aforementioned schemes [29][30][31][32] were succeeded to some extend by several studies.…”

Section: Introductionmentioning

confidence: 99%

The Combustion Characteristics of Double Ramps in a Strut-Based Scramjet Combustor

et al. 2021

View full text Add to dashboard Cite

This paper focuses on the influence of ramp locations upstream of a strut-based scramjet combustor under reacting flow conditions that are numerically investigated. In contrast, a computational study is adopted using Reynolds Averaged Navier Stokes (RANS) equations with the Shear Stress Transport (SST) k-ω turbulence model. The numerical results of the Deutsches Zentrum für Luft- und Raumfahrt or German Aerospace Centre (DLR) scramjet model are validated with the reported experimental values that show compliance within the range, indicating that the adopted simulation method can be extended for other investigations as well. The performance of the ramps in the strut-based scramjet combustor is analyzed based on parameters such as wall pressures, combustion efficiency and total pressure loss at various axial locations of the combustor. From the numerical shadowgraph, more shock interactions are observed upstream of the strut injection region for the ramp cases, which decelerates the flow downstream, and additional shock reflections with less intensity are also noticed when compared with the DLR scramjet model. The shock reflection due to the ramps enhances the hydrogen distribution in the spatial direction. The ignition delay is noticed for ramp combustors due to the deceleration of flow compared to the baseline strut only scramjet combustor. However, a higher flame temperature is observed with the ramp combustor. Because more shock interactions arise from the ramps, a marginal increase in the total pressure loss is observed for ramp combustors when compared to the baseline model.

show abstract

“…Followed by Oevermenn, many researchers have numerically investigated supersonic combustion using strut injector as the reference model. 18,[25][26][27][28][29][30] The study of Choubey and Pandey 13 on the effect of two struts in the combustor model with hydrogen injection from the walls shows the better mixing of the airfuel streams. The higher the wall pressure interactions, the high the reflection angle with less intensity, and multiple shocks are formed creating more turbulence at the divergent area of the combustor.…”

Section: Introductionmentioning

confidence: 99%

“…Followed by Oevermenn, many researchers have numerically investigated supersonic combustion using strut injector as the reference model. 18,25–30…”

Section: Introductionmentioning

confidence: 99%

Numerical investigations on the influence of double ramps in a strut based scramjet combustor

Athithan

Jeyakumar

2022

International Journal of Engine Research

View full text Add to dashboard Cite

This numerical study addresses the performance of double ramps in a strut injection scramjet combustor. Reynolds Averaged Navier Stokes (RANS) equations with the Shear Stress Transport SST k-[Formula: see text] turbulence model are used for numerical analysis. The dual ramps are located symmetrically at the top and bottom wall of a scramjet combustor downstream of the strut injector. The influence of the location of ramps in the scramjet combustor is analyzed based on the key parameters such as shock waves, static pressures, and temperature distribution across the combustor, which are verified with available DLR scramjet experimental data that show similar acceptable values within the range. Simulation is extended for the investigation of other configurations. The performance of the scramjet configurations has been analyzed using the variables such as shock patterns, Mach number contours, wall static pressures, mass fractions of the reactants and products, combustion efficiency, and stagnation pressure loss of combustor. Numerical shadowgraph indicates that numerous shock reflections occur for the dual ramp cases that decelerate the combustor’s flow downstream. In addition, the recirculation regions are created for the dual ramp cases, which help in anchoring the flame. The static pressure distributions show the variation of peaks due to shock patterns and their interactions. The combustion efficiency increases as the ramps are positioned downstream of the strut injector. The mass fractions of reactants and products indicate complete combustion of the hydrogen issued from the combustor in the vicinity of the cavities. The total pressure loss for the DLR strut model is comparatively lower than dual ramp cases due to the multiple shocks from the ramp decelerating the flow downstream of the combustor.

show abstract

Numerical investigation on influence of diamond shaped strut on the performance of a scramjet combustor

Cited by 34 publications

References 72 publications

LES/FMDF of turbulent reacting jet in cross-flow

LES/FMDF of turbulent reacting jet in cross-flow

The Combustion Characteristics of Double Ramps in a Strut-Based Scramjet Combustor

Numerical investigations on the influence of double ramps in a strut based scramjet combustor

Contact Info

Product

Resources

About