(上海交通大學(xué) 動(dòng)力機(jī)械與工程教育部重點(diǎn)實(shí)驗(yàn)室，上海 200240)
摘 要: 基于四參數(shù)隨機(jī)生長(zhǎng)方法開(kāi)發(fā)涂層微結(jié)構(gòu)構(gòu)造軟件，構(gòu)造層狀涂層各向異性孔隙微結(jié)構(gòu)，基于熱阻網(wǎng)絡(luò)方法開(kāi)發(fā)涂層隔熱性能分析軟件，通過(guò)數(shù)值模擬分析不同孔隙大小、厚度和方向下層狀涂層內(nèi)部傳熱過(guò)程，得到層狀涂層有效導(dǎo)熱系數(shù)和穩(wěn)態(tài)導(dǎo)熱溫度場(chǎng)。結(jié)果表明：提高涂層的孔隙率能有效地增強(qiáng)涂層隔熱性能；孔隙率一定時(shí)，層狀孔隙細(xì)小化會(huì)減弱涂層的隔熱性能，但有利于穩(wěn)態(tài)導(dǎo)熱溫度場(chǎng)的均勻分布，有利于涂層結(jié)構(gòu)穩(wěn)定；孔隙率一定時(shí)，層狀孔隙細(xì)長(zhǎng)化在一定程度上會(huì)增強(qiáng)涂層的隔熱性能；孔隙率一定時(shí)，在0°~90°內(nèi)，隨著孔隙水平夾角的增大，涂層的隔熱性能會(huì)有所減弱。且孔隙率越大，這種減弱趨勢(shì)越明顯。
關(guān)鍵字: 熱障涂層；層狀微結(jié)構(gòu)；孔隙率；有效導(dǎo)熱系數(shù)；隔熱性能
（Key Laboratory for Power Machinery and Engineering, Ministry of Education,
Shanghai Jiao Tong University, Shanghai 200240, China）
Abstract:A software for constructing coating microstructure was developed based on the quartet structure generation set (QSGS), and the anisotropic pore microstructure of layered coating was constructed, also a software for analyzing the thermal insulation performance was developed based on thermal resistance network method. By numerical simulation, the heat transfer process within the layered coatings of different pore sizes, thicknesses and directions was analyzed, then, the coating effective thermal conductivity and thermal steady state temperature field were obtained. The results show that increasing the porosity of the coating can effectively enhance the thermal insulation performance of the coating. When porosity is constant, as the layered pores diameter decreases, its thermal insulation performance will be weakened, but the steady-state temperature distribution will be more uniform, and the structure will be more stable. When porosity is constant, as the layered pores elongating, its thermal insulation performance will be enhanced to some extent. When porosity is constant in the range of 0°-90°, as the horizontal angle of the layered pores increases, its thermal insulation performance will be weakened. And the higher the porosity, the more obvious the weaken trend.
Key words: thermal barrier coating; layered microstructure; porosity; effective thermal conductivity; thermal insulation performance
