Theoretical investigation of combustion characteristics in ram‐jet dump combustor with side‐inlet

Chuang, Shu‐Hao; Lin, Hsun-Cheng; Chen, Minghua; Jan, Jin-Fa

doi:10.1002/fld.1650151004

Cited by 3 publications

(1 citation statement)

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“…The numerical simulation of this process is of great interest because it would produce quantitative results at a reduced cost when compared with employing experimental methods. There are several works that apply numerical simulation to the processes of mixing and combustion assuming that the primary flow does not contain particles [34][35][36][37][38][39][40][41][42][43]. Some of them show that the description of the flow without combustion, using k21 turbulence models, is satisfactory in comparison with experimental results.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of heterogeneous combustion in a ducted rocket

Salvá

Tizón

Jenaro³

et al. 2007

Proceedings of the Institution of Mechanical Engineers, Part G:

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A model to analyse the heterogeneous combustion process that takes place in an axisymmetric combustor of an air ducted rocket is presented, including radiation. The fuel, injected into the combustor through a simple injector, is a mixture of gaseous products, carbon particles, and MgO inert particles that results from the combustion of a solid fuel (HTPB-AP-Mg). The turbulence model used is the realizable k—π model. The adopted reaction model is a reduced kinetic scheme composed of five reactions, three in gaseous phase and two heterogeneous. The model ‘finite rate/eddy dissipation model of Magnussen and Hjertager’ is used to calculate the production terms in the gas phase, meanwhile the mixed model of Field, Baum, and Street is used for the oxidation reaction of carbon particles. After a detailed analysis of the numerical results, obtained with a commercial code for a specific combustor geometry and one set of boundary conditions both for the gaseous and solid phases, the existence of a special combustion pattern is found. It is composed of a turbulent diffusion jet flame attached to the injector, where only the gaseous fuel is burned, followed by a reaction region that envelops the jet of carbon particles at the aft of the combustion chamber. This jet of carbon particles oxidizes at a finite rate producing CO and CO2. The emission of CO and C(s) from the combustor is the main cause of high efficiency reduction. Radiation has little effect on calculated global variables, such as efficiency, mass flowrate, and total pressure loss, but on the contrary its effects on the temperature fields became important. Chilling of the gas phase was observed together with a reduction of solid particle temperature, however wall combustor temperature increased greatly. Simulation results are interpreted in the light of experimental observations and available numerical solutions in the literature.

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Section: Introductionmentioning

confidence: 99%

Numerical analysis of heterogeneous combustion in a ducted rocket

Salvá

Tizón

Jenaro³

et al. 2007

Proceedings of the Institution of Mechanical Engineers, Part G:

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Numerical calculations of three‐dimensional turbulent vortex breakdown

Spall

Gatski

1995

Numerical Methods in Fluids

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SUMMARYNumerical solutions to the three-dimensional, unsteady, incompressible Reynolds-averaged Navier-Stokes equations have been obtained for bubble-type vortex breakdown. Two different turbulence models were employed: (1) standard K-E and (2) an explicit, regularized algebraic Reynolds stress model. Results are computed at a Reynolds number of 10,000. The algebraic Reynolds stress model produced a breakdown bubble with a larger length-to-diameter ratio than did the K--E model. Breakdown also occurred at lower levels of adverse pressure gradient for the algebraic stress model than for the K--E model. In each case single-cell breakdown structures resulted. This is contrasted with numerical calculations for laminar breakdown which reveal the existence of complex multicell bubble breakdown structures.KEY WORDS vortex breakdown; turbulence; computational fluid dynamics

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