On gas-dynamic similarity of high-pressure hydrogen release into air

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The paper discusses the issues of gas-dynamic similarity in the problem of high-pressure hydrogen release into air and the possibility of laboratory modeling of the process by reducing the initial pressure at a fixed ratio of hydrogen and air pressures. The fundamental factor in the considered problem is the probability of hydrogen spontaneous ignition, which significantly limits the applicability of gas-dynamic similarity in modeling the considered process. It is shown, however, that for large values of the hydrogen and air pressure ratio (from 200 to 700 and higher) in view of the small values of the hydrogen ignition delay time, one can speak about the gas-dynamic similarity in a wide range of initial pressures. This should allow laboratory modeling the process of high-pressure hydrogen release with subsequent spontaneous ignition in atmospheric air at reduced pressure.

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Sobre autores

A. Kiverin

Joint institute for high temperatures of the Russian Academy of Sciences; Kutateladze Institute of Thermophysics, Siberian Branch of the Russian Academy of Sciences

Autor responsável pela correspondência
Email: alexeykiverin@ihed.ras.ru
Rússia, Moscow; Novosibirsk

A. Smygalina

Joint institute for high temperatures of the Russian Academy of Sciences

Email: alexeykiverin@ihed.ras.ru
Rússia, Moscow

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2. Fig. 1. Characteristic flow structure in the region of hydrogen self-ignition when it flows under high pressure into the air

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3. Fig. 2. Calculation of pressure (solid lines) and temperature (dashed lines) in the region between the shock wave front and the contact discontinuity for different values ​​of the initial pressure p0 and pressure ratio  = 100 (1), 200 (2), 700 (3).

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4. Fig. 3. Dependences of ignition delay time under conditions realized during the flow of hydrogen under high pressure into the air

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Declaração de direitos autorais © Russian Academy of Sciences, 2025