Aerodynamics of a promising vortex furnace design

Ануфриев, И. С.; Стрижак, П. А.; Chernetskii, M. Yu.; Shadrin, E. Yu.; Шарыпов, О. В.

doi:10.1134/s1063785015080027

Cited by 15 publications

(13 citation statements)

References 11 publications

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“…Earlier, based on independent measurement techniques, using 3D-LDA [1] and Stereo PIV (Particle Image Velocimetry) systems [2], the authors studied the aerodynamics of a model of the studied vortex furnace with distributed tangential air supply. Based on the "minimum total pressure criterion" [5] the vortex flow structure was visualized.…”

Section: Measurement Results and Their Analysismentioning

confidence: 99%

“…A distinctive feature of this design compared to the previously studied one [3] (where the additional tangential inlet is located in the lower part of the combustion chamber), is the vertical arrangement of the nozzles of the secondary blast, and the presence of the "visor" inside the vortex chamber to prevent entrainment of fuel particles from the combustion chamber. The advantages of this design of the vortex furnace are described in [1,2]. Measurements of pressure fluctuations were carried out using noise analyzer Bruel&Kjaer (pressure measurement up to 103.5 kPa, frequency measurement -4.2 Hz20 kHz, sensitivity -54.9 mV/PA).…”

Section: Experimental Setup and Measurement Techniquesmentioning

confidence: 99%

“…In previous works [1,2] authors visualized the vortex structure of the flow in the model of the improved vortex furnace with distributed fuel-air mixture supply and vertically oriented nozzles of the secondary blast. The obtained results were based on measuring the time-averaged flow characteristics and did not allow making an unambiguous conclusion about the vortex core dynamics.…”

Section: Introductionmentioning

confidence: 99%

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Identification of possible non-stationary effects in a new type of vortex furnace

2017

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Abstract. The article presents the results of an experimental study of pressure and velocity pulsations in the model of improved vortex furnace with distributed air supply and vertically oriented nozzles of the secondary blast. Investigation of aerodynamic characteristics of a swirling flow with different regime parameters was conducted in an isothermal laboratory model (in 1:25 scale) of vortex furnace using laser Doppler measuring system and pressure pulsations analyzer. The obtained results have revealed a number of features of the flow structure, and the spectral analysis of pressure and velocity pulsations allows to speak about the absence of large-scale unsteady vortical structures in the studied design.

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Section: Measurement Results and Their Analysismentioning

confidence: 99%

Section: Experimental Setup and Measurement Techniquesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Identification of possible non-stationary effects in a new type of vortex furnace

2017

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“…This approach remains to be relevant and is currently supplemented by the capabilities of modern non-intrusive optical systems (laser Doppler anemometry -LDA, Particle image velocimetry -PIV) for a detailed analysis of internal structure of the flows [6,7]. Moreover, the physical experiment provides also an empirical information for verifying the results of mathematical modeling [8,9].…”

Section: Introductionmentioning

confidence: 99%

Investigation of aerodynamic structure of isothermal swirl flow in a two-stage burner

Yusupov

Krasinsky

Шторк

2017

J. Phys.: Conf. Ser.

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Abstract. The work is devoted to experimental and nu merical study of aerodynamic structure of a swirl flow in isothermal model of a vortex burner device that is characterized by the fluid flow supply via two sequentially-mounted tangential swirlers. Depending on the way of the flow supply into the second-stage swirler, either co-swirl or counter-swirl of two flows can be realized. The effect of the second-stage supply direction on the resulting aerodynamic structure has been investigated. Using LDA measurement system the profiles of averaged axial and tangential velocity co mponents were obtained. Experiments have sh own that in the co-swirl case the flow inside the vortex burner model is characterized by strong non-uniformity, wh ile in the counter-swirl regime a rapid mixing of the flows from the first and second stages occurs, resulting in a uniform distribution of the flo w across the chamber section. Nu merical simu lation of 3D isothermal turbulent flow has been performed for the counter-swirl regime using the differential Reynolds stress model in the time-dependent formu lation. Using the Qcriterion for the identificat ion of vortices in numerical data arrays, the evolution of large-scale vortex structures of the swirl flo w inside the vortex chamber has been visualized, indicating the presence of two spiral-shape vortex filaments in the vortex chamber. The periodic character of dynamics of these vortex structures has been revealed.

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“…Study of the flow structure in the four-vortex furnace model was carried out using the particle image velocimetry (PIV) method, which is the more productive in comparison with the method of laser Doppler anemometry, also used for diagnostics of flow pattern [3][4][5][6][7].…”

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confidence: 99%

Flow structure diagnostics in a four-vortex furnace model using PIV-method

Shadrin

Papulov

2017

MATEC Web Conf.

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Abstract. In this paper the flow structure in a four-vortex furnace of a pulverized coal boiler has been studied. The results of an experimental study of inner aerodynamics carried out on a laboratory isothermal model of a combustion device are presented. Using the particle image velocimetry method, flow velocity distributions have been obtained in a number of sections. A spatial flow structure consisting of four stable conjugate vortices with vertical flow rotation axes has been visualized.The perspectives of coal energy development necessitate the creation of new ways of efficient and environmentally safe use of solid fuels. The limited reserves of high-quality solid fuels lead to the need to involve low-grade ("non-project") coals in the fuel and energy balance. The solution of this problem requires a significant increase in the characteristics of steam boilers of TPPs and the development of new types of combustion devices that satisfy modern standards of energy efficiency and environmental safety. One of the promising technologies in this field is fuel combustion in the vortex flow. The flow swirling provides for a more complete fuel burnup due to better mixing and longer residence time of fuel particles in the combustion chamber.In this paper, the flow structure in a perspective combustion device [1] with a fourvortex solid fuel combustion scheme is experimentally studied. Four vortical structures with vertical axes and opposite directions of rotation are formed there. The furnace is designed for the use at thermal power plants for burning brown slagging coal. The furnace is equipped with a shielded rectangular combustion chamber. Two diagonally directed blocks of multilevel burners are mounted on the sidewalls; they are close to the axis of symmetry of the sidewalls so that the ratio of distance between the burners to the burner height is 0.8-1.2. In the center of the front and rear walls, there are nozzles of secondary and tertiary inflow, made in the form of vertical near-wall slots, whose height is equal to the height of the burner unit and oriented relative to each other in opposite directions along the walls, where they are located. Primary fuel combustion occurs in the direct-flow part of the side burner flame. Due to optimal positioning of the side burners, efficient interaction of burner jets mixing and ignition is achieved via intensive flue gas suction in the inter-burner space. The colliding straight-flow parts of the flame, directed from the sidewalls towards each other, turbulize the flow, and due to the nozzles of secondary and tertiary inflow, form four vortex flows with vertical rotation axes ( Fig. 1-a).

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Aerodynamics of a promising vortex furnace design

Cited by 15 publications

References 11 publications

Identification of possible non-stationary effects in a new type of vortex furnace

Identification of possible non-stationary effects in a new type of vortex furnace

Investigation of aerodynamic structure of isothermal swirl flow in a two-stage burner

Flow structure diagnostics in a four-vortex furnace model using PIV-method

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