Abstract
Finger seal is an advanced compliant seal and can be utilized to separate high (HP) and low pressure (LP) zones in high speed rotating shaft environment. The work to be presented concerns the dynamic behavior of a repetitive section of a two-layer finger seal with high-and padded low-pressure laminates. The dynamic performance of the finger seal are analyzed by the coupled fluid-solid-interaction (FSI) simulations. By using the commercial software ANSYS-CFX, the numerical simulation results of interactions between the gas flow and fingers structural deformation are described when the radial periodic excitation from the shaft applies to the finger seal. And the gas film loading capacity, gas film stiffness and leakage varied with time are put forward in different working conditions. Compared with the dynamic performance analysis results based on equivalent dynamic method, the FSI dynamic analysis shows some different characteristics which are more accordance with actual circumstance. Moreover, it is shown that under low pressure differential and high rotation speed the non-contacting finger seal with advance features both in sealing effectiveness and potential unlimited life span can be obtained by rational structure design. But for the non-contacting finger seal with circumferential convergent pad working in high pressure and low rotating speed conditions, it is difficult to improve the sealing performance by the way of changing the structure parameters of finger seal. It is because the high pressure plays a major role on this sealing situation.
Highlights
Finger seal is new type seal presented after labyrinth seal and brush seal which is regarded as a revolutionary new technology in air-to-air sealing for secondary flow control and gas path sealing in gas turbine engines
Using the structural and working conditions from Reference[6],the finger seal displacement responses are calculated by the FSI method from the current paper, and the results are compared with the method of equivalent dynamic model from reference[6]
The finger will rise up following the rotor due to the increasing film load capacity. 4.2 Effect of pad parameters on the finger seal dynamic performance The load capacity of dynamic finger seal is mainly caused by the dynamic pad
Summary
Finger seal is new type seal presented after labyrinth seal and brush seal which is regarded as a revolutionary new technology in air-to-air sealing for secondary flow control and gas path sealing in gas turbine engines. Under the differential pressure and rotary motion of rotor, hydrodynamic pressure will generate in the flow film between rotor and pads to lift the finger seal and maintain the non-contacting operation condition. This non-contacting finger seal are expected to be used in high-speed and high-temperature sealing conditions with better performance. In order to further understand the dynamic performance of the hydrodynamic finger seal and the flow characteristic of the fluid, the fluid-solid coupling analysis method based on the prototype of the sealing system is used in presented work to concern about the dynamic performance of the non-contacting finger seal. The dynamic performances of non-contacting finger seal in different working conditions and with different structures are analyzed in the fourth part, and it ends with the conclusions
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