【摘要】：密封行為對(duì)高速旋轉(zhuǎn)機(jī)械的影響日益受到關(guān)注。迷宮密封中的氣流激振力作用在轉(zhuǎn)子上,對(duì)轉(zhuǎn)子系統(tǒng)的動(dòng)力學(xué)特性有著不可忽視的影響。研究迷宮密封對(duì)于轉(zhuǎn)子系統(tǒng)動(dòng)力學(xué)特性的影響對(duì)于迷宮密封-轉(zhuǎn)子系統(tǒng)的結(jié)構(gòu)設(shè)計(jì)及故障診斷有著重要的參考意義。論文采用FLUENT軟件對(duì)直通型、階梯型及交錯(cuò)型三種迷宮密封流場(chǎng)進(jìn)行數(shù)值分析,研究三種迷宮密封的封嚴(yán)特性及動(dòng)力學(xué)特性系數(shù),分析了進(jìn)出口壓差、轉(zhuǎn)子轉(zhuǎn)速對(duì)迷宮密封泄漏量及動(dòng)力學(xué)特性系數(shù)產(chǎn)生的影響。以某熱電廠使用的TRE100型離心式空氣壓縮機(jī)三級(jí)轉(zhuǎn)子上的迷宮密封為例,計(jì)算了該密封在不同密封間隙、不同進(jìn)出口壓差、不同轉(zhuǎn)速條件下的動(dòng)力學(xué)特性系數(shù)。根據(jù)得到的迷宮密封動(dòng)力學(xué)特性系數(shù),使用有限元方法建立迷宮密封-轉(zhuǎn)子系統(tǒng)動(dòng)力學(xué)模型并運(yùn)用ANSYS軟件進(jìn)行數(shù)值求解�？紤]陀螺效應(yīng)的影響,研究了軸承支承剛度、密封軸向位置、密封間隙、密封進(jìn)出口壓差、轉(zhuǎn)子轉(zhuǎn)速對(duì)于迷宮密封-轉(zhuǎn)子系統(tǒng)模態(tài)振型、臨界轉(zhuǎn)速、穩(wěn)態(tài)不平衡響應(yīng)特性的影響。研究結(jié)果對(duì)迷宮密封結(jié)構(gòu)選型和參數(shù)確定具有一定的參考價(jià)值。
[Abstract]:The effect of sealing behavior on high speed rotating machinery is paid more and more attention. The dynamic characteristics of the rotor system can not be ignored because of the effect of the airflow excitation force on the rotor in the labyrinth seal. It is important to study the influence of labyrinth seal on the dynamic characteristics of rotor system for structural design and fault diagnosis of labyrinth seal rotor system. In this paper, the flow field of three labyrinth seals is numerically analyzed by using FLUENT software. The sealing characteristics and dynamic characteristic coefficients of the three labyrinth seals are studied, and the pressure difference between the inlet and outlet is analyzed. The effect of rotor speed on leakage rate and dynamic characteristic coefficient of labyrinth seal. Taking the labyrinth seal on the three-stage rotor of the TRE100 centrifugal air compressor used in a thermal power plant as an example, the dynamic characteristic coefficients of the seal under different sealing clearance, different inlet and outlet pressure difference and different rotational speed are calculated. According to the dynamic characteristic coefficient of labyrinth seal, the dynamic model of labyrinth seal rotor system is established by finite element method and solved numerically by ANSYS software. Considering the influence of gyroscope effect, bearing support stiffness, seal axial position, seal clearance, seal inlet and outlet pressure difference, rotor speed for labyrinth seal rotor system modal mode, critical speed are studied. The effect of steady state unbalanced response. The research results have certain reference value for the selection of labyrinth seal structure and the determination of parameters.
【學(xué)位授予單位】：華東理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TH136

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