Turbulent flow in a cylindrical circular-recess channel

Волков, К. Н.; Denisikhin, S. V.; Emel’yanov, V. N.

doi:10.1007/s10891-007-0152-3

J Eng Phys Thermophy

2007

DOI: 10.1007/s10891-007-0152-3

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Turbulent flow in a cylindrical circular-recess channel

К. Н. Волков

S. V. Denisikhin

V. N. Emel’yanov

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2016

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“…The fl ow near the bottom of the nozzle of an SPRE is characterized by the presence of zones, where the fl uid decelerates and turns, and regions with high pressure gradients. The fl ows in star-shaped channels and in cylindrical channels with a ring recess were investigated in the works [11,12]. The fl ows of combustion products in regions having a complex geometric confi guration were considered in the works [13][14][15].…”

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Formation of Vortex Structures in the Prenozzle Space of an Engine with a Vectorable Thrust Nozzle

Волков

Emel’yanov

Denisikhin

2016

J Eng Phys Thermophy

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A numerical simulation of the hydrodynamic effects arising in the process of work of the vectorable thrust nozzle of a solid-propellant rocket engine has been performed. The fi elds of the fl ows of combustion products in the channel of a charge, the prenozzle space, and the nozzle unit were calculated for different angles of vectoring of the nozzle. The distributions of the gasdynamic parameters of the fl ow of combustion products in the prenozzle space, corresponding to their effl ux from the cylindrical and star-shaped channels of charges, were compared. The formation of a vortex fl ow in the neighborhood of the back cover of the nozzle was considered. Introduction.A method of increasing the effi ciency of work of a solid-propellant rocket engine (SPRE) is the use of reliable control members in it [1,2]. Control moments can be created in the structure of an SPRE with the use of a vectorable thrust nozzle vectored by steering gears in accordance with commands from the system controlling a fl ight [3][4][5][6].In modern SPREs, the subsonic section of the vectorable nozzle usually enters into (is submerged in) the combustion chamber for engineering reasons. The submergence of the nozzle of an SPRE into the space upstream of it decreases the longitudinal size of the engine but gives rise to a number of problems associated with the fl ow of high-temperature combustion products around the nozzle. The frontal surface of the input-part of a submerged nozzle is subjected to the action of a twophase fl ow of combustion products, which poses the problem of organization of the fl ow in this region so that this fl ow does not increase the heat and erosion actions on the indicated surface [5]. The gasdynamic situation in the prenozzle space of an SPRE is additionally complicated in the case where charges of different types are used in it [3][4][5].The formation of longitudinal large-scale vortices near the perforated wall of the supersonic section of a nozzle and the possibility of using porous inserts for passive control of the nozzle thrust were considered in the work [7]. It is shown in [8] that large-scale longitudinal pair vortices rotating in the opposite directions arise in the case where subsonic plane and circular jets fl ow around a submerged nozzle. These vortices are formed in the subsonic section of the nozzle and then are transferred to its supersonic section where their intensity decreases due to the widening of the vortex tubes. The formation of the indicated vortices is explained by the curvature of the lines of the fl ow around the subsonic section of the nozzle [7].The work of an SPRE with a vectorable thrust nozzle is associated with a nonsymmetric gas fl ow in the channels of the combustion chamber and the nozzle, due to which there arise a side force and a gasdynamic moment acting on the nozzle. This complex three-dimensional gas fl ow involves spread and drain lines, vortex structures, and separation zones, which leads to the intensifi cation of the heat exchange, the nonsymmetric transfer of the cond...

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Formation of Vortex Structures in the Prenozzle Space of an Engine with a Vectorable Thrust Nozzle

Волков

Emel’yanov

Denisikhin

2016

J Eng Phys Thermophy

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Turbulent flow in a cylindrical circular-recess channel

Cited by 1 publication

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Formation of Vortex Structures in the Prenozzle Space of an Engine with a Vectorable Thrust Nozzle

Formation of Vortex Structures in the Prenozzle Space of an Engine with a Vectorable Thrust Nozzle

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