本文關(guān)鍵詞：基于CFD的蒸汽芯模加熱過程仿真及結(jié)構(gòu)優(yōu)化　出處：《哈爾濱理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 熱芯纏繞工藝 數(shù)值模擬 芯模結(jié)構(gòu) 導(dǎo)流板

【摘要】：熱芯纏繞工藝是一種基于內(nèi)固化工藝的新工藝，實(shí)現(xiàn)了復(fù)合材料邊纏繞邊固化的一體化成型。其原理是將復(fù)合材料在芯模上纏繞成型的同時(shí)向芯模內(nèi)通入高溫高壓蒸汽對其進(jìn)行加熱固化，因此具有生產(chǎn)效率高、成品質(zhì)量佳、生產(chǎn)過程簡單等優(yōu)點(diǎn)，目前已應(yīng)用于高壓殼體的生產(chǎn)。 對于熱芯纏繞這種纏繞和固化一體化的工藝來說，固化成型過程中使芯模軸向溫度按照期望分布十分重要。而芯模結(jié)構(gòu)對于芯模軸向溫度分布起著決定性作用。例如，由于通入高溫蒸汽在到達(dá)芯模尾部時(shí)的能量損耗導(dǎo)尾部溫度較低，使得尾部成型質(zhì)量大大降低。而且芯模內(nèi)部管道上的出氣孔附近的芯模外表面溫度更高，導(dǎo)致此處的殼體更易分層。針對這些問題，本文通過在小孔外設(shè)計(jì)導(dǎo)向芯模尾部的導(dǎo)流板對芯模結(jié)構(gòu)加以改進(jìn)，并通過仿真分析和實(shí)驗(yàn)驗(yàn)證對熱芯纏繞工藝進(jìn)行進(jìn)一步研究。 本文將首先介紹熱芯纏繞工藝的工作原理，分析纏繞固化過程的內(nèi)部多場變化原理，從而采用湍流模型、蒸汽相變模型、固流耦合動(dòng)力學(xué)模型、傳熱模型，通過SIMPLE算法，對動(dòng)量、能量控制方程進(jìn)行解算，用流體仿真軟件實(shí)現(xiàn)對整個(gè)加熱過程的仿真模擬。然后，對本文設(shè)計(jì)的帶有導(dǎo)流板的芯模結(jié)構(gòu)改進(jìn)方案建立多組不同導(dǎo)流板角度的模型。在相同入口壓力下分析導(dǎo)流板角度對芯模表面溫度分布的影響，經(jīng)過對兩組模型溫度分布的分析，針對局部高溫和尾部溫度過低問題對角度進(jìn)行優(yōu)化，得到了一個(gè)優(yōu)良角度范圍。再在取自實(shí)際芯模的首中尾部三個(gè)壓力值的入口壓力下對幾個(gè)優(yōu)良角度進(jìn)行第三組仿真，分析不同入口壓力對選取角度的影響，對比其流場、溫度場分布情況，并加入數(shù)學(xué)算法精確分析溫度分布波動(dòng)程度，，選出最適合的芯模模型和加熱方案。經(jīng)過以上幾組仿真分析最終得到最適合的芯模結(jié)構(gòu)。再通過實(shí)物進(jìn)行對比實(shí)驗(yàn)，驗(yàn)證該方案能有效改善芯模局部高溫和芯模尾部低溫的問題，為使芯模溫度按期望分布提供優(yōu)化方法。
[Abstract]:Hot core winding is a new process based on internal solidification process. The principle is to heat and solidify the composite material with high temperature and high pressure steam into the core mold while winding the composite material on the core mold. Therefore, it has the advantages of high production efficiency, good finished product quality, simple production process, and has been used in the production of high pressure shell. For the hot core winding this winding and solidification integration process. It is very important to make the axial temperature distribution of the core die according to the desired distribution during the solidification process. The core mold structure plays a decisive role in the axial temperature distribution of the core mold. For example. Due to the low temperature of energy loss at the end of the core mold, the quality of the tail molding is greatly reduced, and the outer surface temperature of the core mold near the outlet hole in the inner pipe of the core mold is higher. In order to solve these problems, the structure of the core die is improved by designing the guide plate at the end of the core die outside the hole. And through the simulation analysis and experimental verification, the hot core winding process is further studied. This paper will first introduce the working principle of the hot core winding process, and analyze the principle of internal multi-field change in the winding solidification process, so as to adopt turbulence model, steam phase transition model, solid-flow coupling dynamics model, heat transfer model. The momentum and energy control equations are solved by SIMPLE algorithm, and the whole heating process is simulated by fluid simulation software. For the core die structure improvement scheme with guide plate designed in this paper, a number of different flow guide plate angle models are established, and the influence of guide plate angle on core mold surface temperature distribution is analyzed under the same inlet pressure. Through the analysis of the temperature distribution of the two groups of models, the angle is optimized for the local high temperature and the low tail temperature. A good angle range is obtained. Under the inlet pressure of three pressure values of the first and the tail of the actual core die, the third group of simulation is carried out to analyze the influence of different inlet pressure on the selection angle. The flow field and temperature field distribution are compared, and the fluctuation degree of temperature distribution is analyzed accurately by adding mathematical algorithm. The most suitable core mold model and heating scheme are selected. The most suitable core mold structure is obtained through the simulation and analysis above. It is verified that the proposed scheme can effectively improve the local high temperature of the core mold and the low temperature of the core mold tail, and provide an optimization method for the core mold temperature to be optimized according to the expected distribution of the core mold temperature.
【學(xué)位授予單位】：哈爾濱理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB33

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