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Abstract: A numerical method is put forward, which can be used for
analyzing the fluid-solid coupling function of gas flow-induced
vibrations in a three-dimensional rotor seal system. First, a nonlinear
fluid-solid coupling model is set up for a three-dimensional rotor seal
system and then the nonlinear aerodynamic force of a seal device flow
field is calculated through a direct numerical simulation method. As a
result, an analytical method is brought forth, which evaluates the gas
flow-induced vibration problem of a rotor seal system by taking into
account the fluid-solid coupling effect.With respect to different
speeds, pressure ratios and pre-rotations there are different amplitudes
for each individual frequency component of a rotor vibration. However,
there is always a frequency component of rotor first-order critical
speed. Furthermore, the amplitude of the component will increase with
the increase in speed, gas-flow inlet pressure and the
positive-direction incoming gas pre-rotation. The above circumstance is
found to be in fairly good agreement with the phenomenon of seal gas
flow-induced vibrations found in engineering practice and test
results.The nonlinear characteristics of the seal gas flow-induced
vibrations is captured.
Key words: Seal Nonlinear Gas flow-induced vibration Fluid-solid
coupling
CLC No: TK26
国家自然科学基金资助项目(50076019). Received 20011101, received in revised form
20020626
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