Delnov V.N.
A.I. Leypunsky Institute for Physics and Power Engineering, Obninsk, Russia
The paper considers the IPPE JSC scientific discoveries in the area of hydrodynamics of distribution header systems (DHS) in heat exchangers and reactors of nuclear power plants (NPP).
A brief analysis is given of the scientific discoveries registered in the USSR for the period from 1969 to 1991 and registered at the International Academy of Authors of Scientific Discoveries and Inventions for the period from 1991 to 2022.
Some definitions related to scientific discoveries and a classification of various typical DNS are presented.
Consideration is given to hydrodynamic features and characteristic patterns of the coolant flow in the DHS flow parts, with different conditions for the coolant supply and removal.
It is demonstrated that in a relatively restricted space and in free space of the DHS the coolant flow is of a jet nature. However, there are a few types of jets and processes to transform one type of jet into another.
A brief description and some formulas are given of the regularity of liquid distribution at the outlet of the DHS flow paths and the phenomenon of hydrodynamic identity in the distribution header systems, registered as scientific discoveries.
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