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Mathematical background for static analysis of impulse gas seal is created in current paper. It includes evaluation of gap and flow rates of gas in turbocompressors. This paper consists of two parts. In the first one all logical steps of creation of the theoretical model for impulse gas seals are given. It should be mentioned, that they are valid for isothermal steady process which is observed here. The verification of derived theory is shown in the second part on a calculation example.

The paper describes the construction and operating principle of the non-contacting impulse face seal. A mathematical model of the impulse seal was formulated. The method of control of the opening force by change of the cavity volume within sealing gap was described. The results obtained from the numerical calculations prove that the effect of the cavity volume on the axial vibrations of the flexibly mounted ring.

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