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Total number
Full text
Number of local repositories
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0213U007539,
0112U000935
,
Development equalincreased heat transfer surfaces for gas turbine regenerators of gas transport systems and research their heat-aerodynamics characteristics .
Pismennyy E. N.,
06-12-2013
Faculty of аircraft and space systems NTUU "KPI"
Object of research - process manufacturing technology helical tubes for external aerodynamics and heat transfer in arrays of spiral tubes equally developed surface. Purpose of the study - technology of spiral tubes equally developed surface patterns and impact indicators to foreign heat and aerodynamic properties of geometric parameters of tubes helical profile, their ranges and operational factors. Purpose - to develop recommendations on technology of spiral tubes equally developed surface by trohrolykovoho obkochuvannya smooth walled tubes of circular cross section using the internal mandrel, creating a common calculation methods of heat transfer and aerodynamic resistance surfaces when they are cross-washing gas flow based on experimental studies of transport processes of heat and momentum for heat exchangers such as "gas-gas". Research methods - determination of average convective heat transfer coefficients and coefficients of resistance on the results of experimental measurements of the temperature distribution on the surface of tubes and pressure losses packages helical tubes. The study of the flow on the outer surface of the tube surface visualization method using injection saget - kerosene suspension in the stream. Measurement of geometrical parameters and the hardness of the metal spiral tube after deformation. Carrying out numerical simulations to identify optimal pitch and depth on the surface of hollow tubes without destroying it and determine intensity strength tube after deformation. First examined patterns of external heat transfer and aerodynamic resistance chess packages spiral tubes in developed surface mounted impact of basic geometric and operational parameters on the intensity of heat. These new generalized expressions for the calculation of convective heat transfer and resistance to change into account the geometric characteristics of tubes and packages ranging changes: h/D from 0.09 to 0.13 and t/D from 0.2 to 0.32 , the relative longitudinal and transverse steps between the tubes from 1.1 to 1.9 and from 0.9 to 2.4, respectively. The surface of the outer tube intensify heat transfer depending on the geometrical parameters of tubes and packages of 1.1-1.25 times with a slight increase in resistance compared with packages tubes round profile . Rate of development of the surface is relatively 1.15-1.25 smooth-walled surface.
Баранюк О.В.
Бородій Ю.П.
Маковей В.О.
Проценко П.Ю.
Рева С.А.
Рогачов В.А.
Терех О.М.
2020-04-02
Updated: 2025-12-06
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