Numerical Investigation of the Effect of Sudden Expansion Ratio of Solid Fuel Ramjet Combustor with Swirling Turbulent Reacting Flow

Li, Weixuan; Chen, Xiong; Cai, Wenxiang; Musa, Omer

doi:10.3390/en12091784

Cited by 8 publications

(3 citation statements)

References 35 publications

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“…As described in Ref. [53], the heat transfer coefficient can be promoted with the effect of vortices. Thus, the aforementioned phenomenon could be explained as follows.…”

Section: Heat Transfer Characteristics Figure 11 Describes the Regres...mentioning

confidence: 94%

Numerical Investigation of Inlet Thermodynamic Conditions on Solid Fuel Ramjet Performances

Zhao

Chen

et al. 2021

International Journal of Aerospace Engineering

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In this work, 2D numerical RANS (Reynolds Average Navier-Stokes) simulations were carried out to investigate the thermodynamic performance of a solid fuel ramjet (SFRJ) with different inlet conditions. This is achieved by using an in-house FORTRAN code to simulate a 2D turbulent, reacting, unsteady flow in the ramjet engine. The inlet conditions are characterized by three key parameters: (1) swirl number ( S N ), (2) mass flow rate ( m ̇ air ), and (3) inlet temperature ( T in ). With the code numerically validated by benchmarking with a number of computed cases, it is applied to perform systematic studies on the turbulent flow recirculation, combustion, and heat transfer characteristics. It is found that increasing S N , m ̇ air , or T in can dramatically enhance the combustion heat release rate, regression rate, and combustor average temperature. Furthermore, the analysis on the chemical reaction intermediate (CO) reveals that the chemical reaction is more sufficient with increased m ̇ air , but S N = 0 . In addition, a secondary vortex is generated at the corner of the backward facing step in the presence of a swirl flow resulting from the instability of the shear layer. Finally, the nonlinear correlations between the heat transfer, combustion characteristics, and flow field characteristics and the corresponding inlet thermodynamic parameters are identified.

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“…As described in Ref. [53], the heat transfer coefficient can be promoted with the effect of vortices. Thus, the aforementioned phenomenon could be explained as follows.…”

Section: Heat Transfer Characteristics Figure 11 Describes the Regres...mentioning

confidence: 94%

Numerical Investigation of Inlet Thermodynamic Conditions on Solid Fuel Ramjet Performances

Zhao

Chen

et al. 2021

International Journal of Aerospace Engineering

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“…The initial temperature is fixed at 300 K. The plate has density of 7840 kg/m 3 , a thermal conductivity of 49.8 W/(m•K), and specific heat of 465 J/(kg•K). The analytical solutions are calculated using Equations (14) and (15) for transient temperature distributions. Excellent agreements are observed when comparing numerical and analytical results (see Figure 14).…”

Section: Heat Conductionmentioning

confidence: 99%

“…Swirl flow has a major impact on flame stabilization and performance of SFRJ, as reported by many studies [10][11][12][13][14][15][16][17][18][19]. William et al [20] experimentally examined the SFRJ at low air mass flux with swirl intensity varying from 0 to 0.649.…”

Section: Introductionmentioning

confidence: 99%

Unsteady Simulation of Ignition of Turbulent Reactive Swirling Flow of Novel Design of Solid-Fuel Ramjet Motor

Musa

Chen

et al. 2019

Energies

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This paper presents a numerical investigation of ignition and combustion stabilization of a novel design of a solid-fuel ramjet (SFRJ) motor with and without swirl flow. The proposed design includes two solid fuels, retaining the simple design of the classic SFRJ. Numerical simulations of unsteady, turbulent, reactive, and swirling flow coupled with solid-fuel pyrolysis have been performed using an in-house CFD solver. Experiments on SFRJ were conducted via a connected-pipe test facility to validate the developed code. Furthermore, the code was validated for chemical reactions, heat diffusion, and swirl flow by using benchmark test cases of shock-induced, semi-infinite plate, and dump combustor with swirl flow, respectively. Then, the proposed and classic designs were simulated for the same inflow conditions and configurations, and the results were analyzed and discussed. It is found that the mixing degree, reactant residence time, mass flux, ignition delay time, and regression rate improve when using the proposed design. Moreover, the proposed design reveals interesting observations of a new flame being created and merged with the main flame.

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Ramjet combustion instability and thermodynamic performances

Zhao¹

2023

Thermoacoustic Combustion Instability Control

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Numerical Investigation of the Effect of Sudden Expansion Ratio of Solid Fuel Ramjet Combustor with Swirling Turbulent Reacting Flow

Cited by 8 publications

References 35 publications

Numerical Investigation of Inlet Thermodynamic Conditions on Solid Fuel Ramjet Performances

Numerical Investigation of Inlet Thermodynamic Conditions on Solid Fuel Ramjet Performances

Unsteady Simulation of Ignition of Turbulent Reactive Swirling Flow of Novel Design of Solid-Fuel Ramjet Motor

Ramjet combustion instability and thermodynamic performances

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