本文選題：孔型密封　切入點(diǎn)：進(jìn)口預(yù)旋　出處：《西安交通大學(xué)學(xué)報(bào)》2016年01期 　論文類(lèi)型：期刊論文

【摘要】：為了展示透平機(jī)械密封系統(tǒng)設(shè)計(jì)中進(jìn)口防旋板在改善密封轉(zhuǎn)子動(dòng)力特性和增強(qiáng)轉(zhuǎn)子系統(tǒng)穩(wěn)定性的止旋方面的性能,采用基于轉(zhuǎn)子多頻橢圓軌跡渦動(dòng)模型和動(dòng)網(wǎng)格技術(shù)的非定常數(shù)值方法,研究了進(jìn)口防旋板對(duì)孔型密封非定常氣流激振力和轉(zhuǎn)子動(dòng)力特性系數(shù)的影響,計(jì)算分析了進(jìn)口預(yù)旋比分別為0和0.6時(shí)2種進(jìn)口防旋板結(jié)構(gòu)的孔型密封轉(zhuǎn)子動(dòng)力特性系數(shù)、非定常氣流激振力和流場(chǎng)特性,并與實(shí)驗(yàn)結(jié)果進(jìn)行了對(duì)比。研究表明:非定常數(shù)值方法能夠準(zhǔn)確預(yù)測(cè)與頻率相關(guān)的孔型密封轉(zhuǎn)子動(dòng)力特性系數(shù);進(jìn)口預(yù)旋可顯著減小孔型密封的有效阻尼、增大有效阻尼項(xiàng)的穿越頻率,易誘發(fā)轉(zhuǎn)子渦動(dòng)失穩(wěn);進(jìn)口防旋板能夠有效減小孔型密封的進(jìn)口旋流速度、孔型密封的交叉剛度和有效阻尼穿越頻率,增大孔型密封的有效剛度和有效阻尼,進(jìn)而提高轉(zhuǎn)子系統(tǒng)的穩(wěn)定性。
[Abstract]:In order to show the performance of the imported anti-spin plate in the design of the turbine mechanical seal system, the rotor dynamic characteristics and the rotor system stability can be improved. An unsteady numerical method based on the rotor multi-frequency elliptical trajectory vortex model and dynamic grid technique is used to study the effect of the imported anti-rotating plate on the unsteady airflow excitation force and the rotor dynamic characteristic coefficient of the perforated seal. The dynamic characteristic coefficients, unsteady airflow excitation force and flow field characteristics of two kinds of perforated seal rotor with inlet prespin ratio of 0 and 0.6 respectively are calculated and analyzed. The results are compared with the experimental results. The results show that the unsteady numerical method can accurately predict the frequency dependent rotor dynamic characteristics of the perforated seal, and the inlet prerotation can significantly reduce the effective damping of the perforated seal. Increasing the crossing frequency of the effective damping term can easily induce the rotor vortex instability, and the inlet anti-rotation plate can effectively reduce the inlet swirl velocity of the hole seal, the cross stiffness and the effective damping crossing frequency of the hole seal. The stability of rotor system is improved by increasing the effective stiffness and damping of pass seal.
【作者單位】： 西安交通大學(xué)能源與動(dòng)力工程學(xué)院;先進(jìn)航空發(fā)動(dòng)機(jī)協(xié)同創(chuàng)新中心;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(51406144) 博士后科學(xué)基金資助項(xiàng)目(2014M550490)
【分類(lèi)號(hào)】：TH136

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本文編號(hào)：1557539