Experimental measurement system and method for dynamic characteristic coefficient of annular dynamic seal

Abstract

The invention discloses an experimental measurement system and method for a dynamic characteristic coefficient of an annular dynamic seal, the experimental measurement system comprises a dynamic seal experimental section, a gas supply system, a driving system, an excitation system and a measurement system, and stable harmonic excitation is provided for a stator, so that the stator deviates from a central position to perform small-displacement periodic vortex motion; and the vortex displacement, the vortex acceleration and the received excitation force of the stator are synchronously measured, so that the dynamic characteristic coefficient related to the non-contact annular dynamic seal frequency is efficiently and accurately measured and identified in the frequency domain. According to the invention, not only can operation working condition parameters such as sealing inlet airflow pressure, rotor rotating speed and inlet pre-rotating speed be conveniently adjusted, but also sealing elements with different geometric dimensions or different structural types can be replaced for experiments, and reliable reference is provided for design and application of a dynamic sealing device of turbomachinery.

Description

technical field [0001] The invention belongs to the technical field of turbine mechanical dynamic seals, and in particular relates to an experimental measurement system and method for dynamic characteristic coefficients of annular dynamic seals. Background technique [0002] The annular dynamic seal device is one of the key components of modern turbomachinery. Its primary function is to limit the pressure difference flow of the working medium between the dynamic and static interface of the turbomachinery, thereby reducing the leakage amount and the influence of the leakage flow on the mainstream, and improving the turbomachinery. Mechanical operating efficiency. In addition, with the development of turbomachinery in the direction of high temperature, high pressure and high speed, the fluid exciting force induced by the dynamic pressure effect in the small channel of the annular dynamic seal cannot be ignored, and may even lead to the instability of the rotor system, which se...

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Problems solved by technology

Early experimental research mainly used the shock excitation mechanical impedance method to measure the effective damping, critical speed and vibration amplitude of the rotor-bearing-seal system, and then analyzed the influence of the dynamic seal on the stability of the rotor system, but this method cannot obtain all the sealing dynamics The current common experimental device based on the unbalanced co-frequency excitation mechanical impedance method can only measure the seal dynamic characteristic coefficient at the same frequency as the rotational speed, and is not suitable for damping dynamic seals with strong frequency correlation of the dynamic characteristic coefficient, and requires fluid Exciting force amplification device, poor measurement accuracy

[0004] At present, most annular dynamic seal experimental devices cannot measure the dynamic characteristic coefficient related to the sealing frequency, and a new experimental measurement system and method for the dynamic characteristic coefficient of annular dynamic seal are urgently needed

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