【摘要】：結(jié)合密封環(huán)的工作特點和結(jié)構(gòu)形式,提出密封環(huán)在接觸過程中局部高溫?zé)釒傻哪M方法。基于伽遼金有限元算法,構(gòu)建密封系統(tǒng)的熱傳導(dǎo)、熱流密度、溫度場擾動等非均勻特性的物理模型,及其各物理場之間的耦合關(guān)系,將密封環(huán)局部高溫?zé)釒У臒岵环�(wěn)定問題轉(zhuǎn)化為矩陣行列式,并進(jìn)行求解,可以獲得在不同的摩擦條件下,發(fā)生局部高溫?zé)釒У呐R界速度值。同時,模擬計算獲得了臨界速度與摩擦因數(shù)、彈性模量、導(dǎo)熱系數(shù)、熱膨脹系數(shù)和密封環(huán)尺寸的關(guān)系曲線。除導(dǎo)熱系數(shù)外,其余幾個因素對生成高溫?zé)釒У呐R界速度影響較大。利用密封系統(tǒng)試驗臺進(jìn)行結(jié)果分析和模型驗證,在高溫?zé)釒У呐R界速度方面,試驗結(jié)果與模擬計算保持一致。通過掃描電子顯微鏡進(jìn)行密封表面形貌分析,在試驗速度高于臨界速度的條件下進(jìn)行試驗后,密封表面出現(xiàn)明顯的帶狀磨痕,與高溫?zé)釒卣饔休^高的吻合度,表明有限元離散模型在密封熱不穩(wěn)定研究方面的適用性。
[Abstract]:Combined with the working characteristics and structural forms of the sealing ring, a simulation method for the formation of the local high temperature tropical zone during the contact process of the sealing ring is proposed. Based on Galerkin finite element method, the physical model of heat conduction, heat flux density, temperature field disturbance and the coupling relationship among the physical fields of the sealed system are constructed. The problem of thermal instability in the local high temperature zone of the sealing ring is transformed into a matrix determinant, and the critical velocity values of the local high temperature zone can be obtained under different friction conditions. At the same time, the curves of critical velocity and friction coefficient, elastic modulus, thermal conductivity, thermal expansion coefficient and size of seal ring are obtained. In addition to the thermal conductivity, the other factors have a great influence on the critical velocity of the high temperature zone. The results are analyzed and verified by using the sealing system test-bed. The experimental results are consistent with the simulation results in the critical velocity of the high-temperature tropical zone. The surface morphology of the seal was analyzed by scanning electron microscope. When the test speed was higher than the critical speed, there were obvious band wear marks on the seal surface, which were in good agreement with the characteristics of the high temperature tropics. It is shown that the finite element discrete model is applicable to the study of thermal instability of seals.
【作者單位】： 江蘇大學(xué)汽車與交通工程學(xué)院;中國北方車輛研究所;
【基金】：國家自然科學(xué)基金(51675238) 中國博士后科學(xué)基金(2017M610301) 江蘇省“六大人才高峰”高層次人才(2014-JXQC-005) 江蘇大學(xué)科技項目青年扶持基金(FCJJ005)資助項目
【分類號】：TB33;TH136

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