本文選題：碳纖維 + 格子Boltzmann方法��； 參考：《哈爾濱工業(yè)大學》2015年碩士論文

【摘要】：碳纖維復合材料具有的低熱導率性能使得它在熱防護方面的用途越來越廣泛,而且任何高于絕對零度的物體都在發(fā)射和吸收輻射能,尤其在高溫情況下。格子Boltzmann方法在流體力學與熱傳輸領(lǐng)域目前是最具前途的數(shù)值模擬方法之一,對輻射與導熱耦合傳熱問題的研究也具有可行性。本文從理論出發(fā),基于格子Boltzmann方法對碳纖維復合材料的五種典型結(jié)構(gòu)進行了導熱和輻射導熱耦合模擬,針對90°二維編織、短切纖維無規(guī)則排列、軸向相互平行排列等典型編織結(jié)構(gòu),及有規(guī)則光滑層狀組織、各向同性光滑層狀組織、粗糙層狀組織等三類熱解碳微觀組織,主要研究內(nèi)容包括:(1)基于格子Boltzmann方法,針對碳纖維復合隔熱結(jié)構(gòu),建立了熱傳導模型,采用Fortran語言編制了導熱及輻射的計算程序并進行了可靠性驗證;(2)計算了從273K到1273K之間五種結(jié)構(gòu)的各向異性導熱性能,分析溫度、厚度、編織結(jié)構(gòu)和熱解碳微觀組織對其導熱性能的影響;(3)計算五種結(jié)構(gòu)輻射導熱耦合傳熱下的當量傳熱性能參數(shù),分析溫度對輻射熱流的影響規(guī)律,并分別對比輻射熱流對不同編織結(jié)構(gòu)和不同熱解碳微觀組織的碳纖維復合材料導熱性能的影響程度。研究發(fā)現(xiàn),碳纖維復合材料的溫度、厚度、編織結(jié)構(gòu)均對其傳熱性能有著明顯的影響。考慮輻射作用下的當量傳熱性能,在低溫時與純導熱相比差別不大,而在溫度高于600K之后,當量傳熱性能逐漸高于純導熱的值,為工程應用提供了設(shè)計參考。
[Abstract]:Carbon fiber composites are widely used in thermal protection due to their low thermal conductivity, and any object above absolute zero emits and absorbs radiation energy, especially at high temperature. Lattice Boltzmann method is one of the most promising numerical simulation methods in the field of fluid mechanics and heat transfer. In this paper, based on lattice Boltzmann method, heat conduction and radiation conduction coupling simulation of five typical structures of carbon fiber composites are carried out. For 90 擄two-dimensional braiding, the short cut fibers are arranged irregularly. Typical braided structures such as axial parallel arrangement, regular smooth lamellar structure, isotropic smooth lamellar microstructure, rough lamellar microstructure, etc. The main research contents include: 1) lattice Boltzmann method. A heat conduction model is established for carbon fiber composite thermal insulation structure. The calculation program of heat conduction and radiation is compiled by Fortran language and the reliability verification is carried out. The anisotropic thermal conductivity of five structures from 273K to 1273K is calculated, and the temperature is analyzed. The influence of thickness, braided structure and Microstructure of Pyrolytic carbon on the Thermal conductivity of five structures the equivalent heat transfer performance parameters under the radiation heat conduction coupling are calculated, and the influence of temperature on the radiation heat flux is analyzed. The effects of radiation heat flux on the thermal conductivity of carbon fiber composites with different braided structures and different pyrolytic carbon microstructures were compared. It is found that the temperature, thickness and braided structure of CFRP have obvious influence on the heat transfer performance. Considering the effect of radiation, the equivalent heat transfer performance is not different from that of pure heat conduction at low temperature, but when the temperature is above 600K, the equivalent heat transfer performance is gradually higher than that of pure heat conduction, which provides the design reference for engineering application.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TB33

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本文編號：1967216