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The paper is focused on a numerical simulation of unsteady flow in a pipeline. The special attention is paid to a numerical model of an air valve, which has to include all possible regimes: critical/subcritical inflow and critical/subcritical outflow of air. Thermodynamic equation of subcritical mass flow was simplified to get more friendly shape of relevant equations, which enables easier solution of the problem. Abstrakt Článek je zaměřen na numerickou simulaci nestacionárního proudění vdoi:10.22223/tr.2014-1/1975 fatcat:eckfxsark5cqxemjb2qe2xza2y