The Calculation of Static Characteristics of Impulse Gas Seal

Abstract

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.

Analysis of Pressure Distribution in Non-Contacting Impulse Gas Face Seals

“…For the adopted sealing ring geometry, it was noted that for the nominal radial clearance height of , the pressure value is . In the subject literature, non-contacting impulse gas face seals are often described as semiactive or self-adjusting seals [22,24]. In the discussed structural solution, the self-adjustment of the radial clearance height is generated through the selection (during the designing phase) of the geometric parameters of the modifications applied to the rings' face surfaces.…”

“…The grooves are facing the process side (gland) space filled with the sealed medium with a set pressure Po. The operating principle for the impulse gas face seal was provided in the papers of the creators of such seals [24].…”

Numerical modeling and analysis of the noncontacting impulse gas face seals

“…The principle of operation of the impulse face seal was described in the papers written by the creators of this kind of seals. 31…”

“…The principle of operation of the impulse face seal was described in the papers written by the creators of this kind of seals. 31 During operation, when the moving channel (4) coincides with the chamber (3) for a short period of time there is a rapid flow (injection) of the sealing medium from the stuffing box to the chamber aforementioned. During this period of time, there is a pressure surge in the chamber.…”

“…Noncontacting impulse face seals are often described in the literature as semi-active or self-regulating seals. 31,35 In the construction solution that was discussed, the effect of self-regulation of the radial gap height is caused by selecting (at the design stage) geometric parameters of the modifications applied on the face surfaces of the rings. A desirable radial gap height is obtained by ''adjusting'' the hydrodynamic force (opening force) generated in the fluid film.…”