Investigation of a pulsating-combustion chamber

Akulich, P. V.; Kuts, P. S.; Samsonyuk, V. K.; Severyanin, V. S.; Slizhuk, V. D.

doi:10.1007/bf02681787

Cited by 2 publications

(4 citation statements)

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“…As the valve positions are interchanged, the fuel feeding tube ( 16) extends as a central pipe inside the cylindrical furnace tube (7), while the air is introduced alone from the lateral inlet for operating the non-premixed flame mode. An eccentric shaft is attached through the bracket (8) to a pulley driven by the AC induction motor (10) which is supported by the concrete base (12) via the metallic frame (11). Two designs are examined for the rotary part arrangement.…”

Section: Experimental Test Rig and Layoutmentioning

confidence: 99%

“…Akulich et al. 10 reported that pulsating combustion ensures heat and mass transfer rates severalfold higher with a greater turbulence intensity (by more than one order of magnitude in comparison to typical combustion systems). The rates of nitric oxides decrease by a factor of three and the thermal efficiency is improved significantly.…”

Section: Introductionmentioning

confidence: 99%

“…Although pulsating combustion is an old technology, it has recently received renewed attention mainly in the search for high-efficiency heating devices and high-pressure pulse systems. Akulich et al 10 reported that pulsating combustion ensures heat and mass transfer rates severalfold higher with a greater turbulence intensity (by more than one order of magnitude in comparison to typical combustion systems). The rates of nitric oxides decrease by a factor of three and the thermal efficiency is improved significantly.…”

Section: Introductionmentioning

confidence: 99%

“…Figure10. Effect of the diameter ratio and rotational speed variation on the exhaust emissions in the first design: (a) experimental variation of the HC emissions by the rotor different cross-sections with the diameter ratio at 4500 r/min and (b) effect of the Strouhal number on the measured NO x emissions for the triangular shaft different hydraulic diameter ratios.…”

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confidence: 99%

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Combustion performance of eccentrically rotated flames

Ismael

Abdelkhalek

Kamal

2013

Proceedings of the Institution of Mechanical Engineers, Part A:

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Experimental/computational work highlighted the combustion performance with eccentric blockage rotation in the reactive flow passage to augment the turbulence production rates in the flame for acquiring high power to weight ratios and effective heat transfer in industrial applications. The temporal/spatial velocity gradients stimulated around the reactive stream boundaries enhanced the turbulence development in both premixed and non-premixed flames. The eccentric shapes included circular, elliptical, squared and triangular shafts as well as a triple/straight blade rotor. The design was further developed to incorporate simultaneous rotation of the eccentric blockage around its axis via a planetary gear assembly to duplicate the vortical structure. While the premixed flames responded to such cyclic action by having a mixture velocity of 16.8 m/s, the non-premixed flames acquired an increase of 341% in the largest eddy size and a flame length reduction by 42%. Increasing the Strouhal number to 0.94 and the swirl ratio to 0.78 increased the turbulent kinetic energy to 9.1 m 2 /s 2 . By controlling the drag coefficient and wake vorticity for the solid shapes, the triangular rotor enhanced the combustor outward heat flux to exhibit a heater efficiency of 36.8% in the premixed flame mode and reduced the HC and CO emissions, respectively, to 0.1% and 513 ppm for non-premixed flames. Decreasing the reactive stream cross-section favorably increased the flow shearing effects, while the elliptical shape showed the highest sensitivity to axes' orientation with respect to the direction of rotation. Due to the reduction in peak temperatures via increasing the turbulence intensity and heat transfer rate from the flame, the NO x exhaust concentrations decreased to a minimum value around 10 ppm. The combustion efficiency of diffusion flames was optimized with the fuel port central positioning in the burner, where the planetary gear design provided a turbulence intensity of 13.7% by the triple blade rotor.

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Section: Experimental Test Rig and Layoutmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Combustion performance of eccentrically rotated flames

Ismael

Abdelkhalek

Kamal

2013

Proceedings of the Institution of Mechanical Engineers, Part A:

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Study the Effect of Air Pulsation on the Flame Characteristics

Magdy

Kamal

Hamed

et al. 2021

TECM

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Pulsating combustion is used in a lot of industrial applications like conveyer drying, spray, boilers of commercial scale because its great role in increasing combustion efficiency and producing environmentally friendly combustion products. This paper evaluates how different frequencies (100, 200, 300, 400 and 500) rad/s applied to air velocity view a lot of improvements in the combustion and flow variables (v, T, NO and turbulent kinetic energy) and the effect of adding cross excess air to air pulsation with 500 rad/s frequency on the same flow variables. The performance of pulsating flames was numerically modulated by using Ansys Fluent 16 commercial package by building a 2D combustion chamber of Harwell standard furnace boundary condition on Ansys geometry and divided it into 61000 elements in Ansys meshing 16. Eddy Dissipation Model (EDM) is used to solve transient numerical combustion equations and Detached Eddy Simulation (DES) as viscous model. Converged numerical results have shown that increasing frequency from 100 to 500 rad/s increase average velocities of combustion products and turbulent kinetic energy by 22% and 80 respectively. The pollutant NO decrease by 60% and the time average temperature decrease from 1900 k to 1000 k.

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Investigation of a pulsating-combustion chamber

Cited by 2 publications

References 0 publications

Combustion performance of eccentrically rotated flames

Combustion performance of eccentrically rotated flames

Study the Effect of Air Pulsation on the Flame Characteristics

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