《Table 5 Pressure forces at five rotational speeds and△P=5000Pa with eccentricity (e=0.0002m)》

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《Effect and sensitivity analysis of the rotational speed on the fluid-induced force characteristics of the straight-through labyrinth gas seal》

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Fig.4 and Table 4 illustrate the dependence of the pressure forces on rotor surface for all five rotational speeds at△P=5000Pa without eccentricity（e=0.0000m）.The radial pressure force first increases by approximately 25.24%（from 0.00078069N at 200rad/s to 0.00097777N at 275rad/s）and subsequently decreases by approximately 30.70%（from 0.00097777N at275rad/s to 0.00067756N at 500rad/s）with the increasing rotational speed；the maximum radial pressure forces is 0.00097777N at 275rad/s（no sensitivity）.The axial pressure force decreases by approximately0.20%（from 0.0052557N at 200 rad/s to 0.0052454N at 500rad/s）with the increasing rotational speed（sensitivity coefficient=-0.0013）.The total pressure force first increases by approximately 0.59%（from0.0053134N at 200rad/s to 0.0053447N at 275rad/s）and subsequently decreases by approximately 1.04%（from 0.0053447N at 275rad/s to 0.005289N at500rad/s）with the increasing rotational speed；the maximum total pressure force is 0.0053447N at275rad/s（no sensitivity）.Therefore，the radial pressure force is significantly smaller than the axial pressure force，which is the crucial part of the total pressure force，and the axial pressure force is more sensitive to the increasing rotational speed.