Effect of transverse fuel injection system on combustion efficiency in scramjet combustor

Verma, Kumari Ambe; Pandey, Krishna Murari; Ray, Mukul; Sharma, K. K.

doi:10.1016/j.energy.2020.119511

Cited by 24 publications

(6 citation statements)

References 57 publications

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“…The spike in combustion efficiency at x = 140mm is a result of the reflected shocks interacting with the shear layer around the central wake region behind the strut, seen in the Mach contour. A maximum combustion efficiency of 73.42% is obtained and is comparable to published literature where efficiencies of approximately 80% were calculated [45]. It is possible efficiency does not reach 100% since the flow makes the particles exit the combustor quickly such that not all of it is able to complete combustion within the combustor.…”

Section: Figure 34 Combustion Efficiency Of Case IVsupporting

confidence: 79%

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A Preliminary Investigation of a Hydrogen Injection Wedge Strut for a Scramject Combustor Application

Ruta

2023

Preprint

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<p>This M.Eng Report is a preliminary investigation of the strut geometry in a strut-based hydrogen scramjet combustor and assesses flow characteristics in an inviscid and viscid flow with no hydrogen injection, a viscid flow with hydrogen injection, and a viscid flow with hydrogen injection and combustion model. This investigation is performed using ANSYS Fluent. The viscid cases utilize the Shear Stress Transport (SST) k-omega model for turbulence, with the volumetric eddy dissipation model for combustion case. Results in this study are validated against the same wedge strut geometry and results from the Deutsches Zentrum für Luftund Raumfahrt (DLR) scramjet, by Waidmann [1], and a grid independence study is conducted for completeness. Performance of the different geometries are quantified by mixing efficiency, combustion efficiency, and total pressure recovery. The 2-dimensional results of this paper are comparable to the Schlieren images (shadow graphs) of the DLR combustor. </p> <p>The viscid case with no hydrogen injection is compared to the inviscid case with no hydrogen stream, resulting in the presence of boundary layers and shear layers. This increased the strength and quantity of shock/expansion wave reflections downstream of the strut. The addition of the hydrogen stream increased the thickness of the central wake region along the combustor, further increasing strength of the shock reflections, as well as creating a symmetric recirculation region downstream of the strut. The eddy-dissipation combustion model is applied, resulting in a larger, non-symmetric recirculation region. The combustion efficiency reached 78.42% with complete mixing at 245 mm along the combustor, whereas the non-combusting case achieved complete mixing at 225 mm along the combustor. The high entropy caused by the irreversible processes across several strong shocks in the combustion case attributed to a total pressure loss of 46%.</p>

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Section: Figure 34 Combustion Efficiency Of Case IVsupporting

confidence: 79%

“…Total pressure recovery measures the amount of freestream conditions that are maintained when the flow exits the combustor. The total pressure loss is defined by Eq.26 [45].…”

Section: Total Pressure Lossmentioning

confidence: 99%

A Preliminary Investigation of a Hydrogen Injection Wedge Strut for a Scramject Combustor Application

Ruta

2023

Preprint

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“…Due to the consideration of effect of kinetic and turbulence, the finite rate/eddy dissipation model are widely adopted to simulate intensive turbulent combustion. , Zaitri et al presents that the finite rate/eddy dissipation model predicts more accurately the flame structure and gives a best in temperature predication . The dome of melter-gasifier is a complex zone where turbulence and chemical reactions interact, so the finite rate/eddy dissipation model is adopted in the simulation.…”

Section: Numerical Modelmentioning

confidence: 99%

Numerical Simulation of Combustion Characteristics in the Dome Zone of the COREX Melter-Gasifier: The Effect of Rising Gas

Zhou

She

et al. 2021

Ind. Eng. Chem. Res.

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The dome zone is one of the most significant areas of the COREX melter-gasifier. The coupled fields in the dome vary with the transport phenomena, which is one of the key factors that impact the smooth operation of the reactor. In this work, a three-dimensional steady-state mathematical model was developed to study the inner characteristics of the dome zone. First, the model was validated by comparing the simulated and experimental results. Then, the effects of key operating parameters of rising gas (e.g., flow rate, component, and temperature) on the hydrodynamics and thermochemical behaviors in the dome zone were analyzed. The results show that the main reaction zone can be divided into three parts, which are controlled by homogeneous reaction, heterogeneous reaction, and diffusion effect in turn. Due to the adequate reaction zone and long residence time, the burnout rate of the dust particle can reach more than 99.9%. Increasing the flow rate of rising gas leads to the increase of CO and H2 in the gas yields. When the proportion of (CO + H2) increases from 80 to 95%, the average temperature of the dome first increases and then decreases, attributed to the heat consumption of excessive H2. The temperature of rising gas insignificantly affects the component of the generator gas at the outlet.

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“…Three passive strategies are studied and reported that a zig-zag surface improves the mixing and combustion in the DLR scramjet combustor. The performance of flush wall injection at various locations in a parallel fueled scramjet combustor has been numerically investigated by Ambe Verma et al 32 They reported a combustion efficiency of up to 96% is achieved at the transverse injection location of 68 mm from the combustor inlet.…”

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

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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.

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Effect of transverse fuel injection system on combustion efficiency in scramjet combustor

Cited by 24 publications

References 57 publications

A Preliminary Investigation of a Hydrogen Injection Wedge Strut for a Scramject Combustor Application

A Preliminary Investigation of a Hydrogen Injection Wedge Strut for a Scramject Combustor Application

Numerical Simulation of Combustion Characteristics in the Dome Zone of the COREX Melter-Gasifier: The Effect of Rising Gas

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

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