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不同孔間距下鎳基單晶葉片氣膜孔彈塑性行為研究
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西北工業(yè)大學(xué)基礎(chǔ)研究基金 (JCY20130126, JC20100231),“111”計(jì)劃 (B07050)；國家自然科學(xué)基金 (51205315, 51210008, 50905142)


Crystallographic Behavior of Nickel Base Single Crystal Blades Film Cooling Holes under Different Hole Distances
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    摘要:

    氣膜冷卻作為一重要的熱防護(hù)技術(shù)廣泛應(yīng)用于渦輪葉片中，但是氣膜孔的引入破壞了葉片的結(jié)構(gòu)完整性，成為裂紋形核的重要區(qū)域。將鎳基單晶葉片前緣氣膜孔簡(jiǎn)化為平板模型，基于晶體塑性理論分析了多孔干涉下氣膜孔的彈塑性力學(xué)行為，分析了孔邊分切應(yīng)力的分布規(guī)律；并比較了不同橫向、縱向間距對(duì)氣膜孔彈塑性行為的影響。結(jié)果表明多排氣膜孔間存在著明顯的應(yīng)力干涉，高應(yīng)力區(qū)出現(xiàn)在相鄰兩列氣膜孔孔心連線區(qū)域，低應(yīng)力區(qū)出現(xiàn)在同列氣膜孔之間，呈現(xiàn)菱形分布?？走叞嗣骟w、十二面體、六面體滑移系均開動(dòng)，最大分切應(yīng)力出現(xiàn)在夾角0o/20o/30o的位置上；橫向孔間距增加，孔邊應(yīng)力降低；縱向孔間距增加，孔邊應(yīng)力增加。六面體滑移系分切應(yīng)力對(duì)載荷、孔間距變化最為敏感

    Abstract:

    Film cooling as an important thermal protection technology has been widely used in gas turbine blades. However, due to stress concentration around holes, the cooling holes have become key crack nucleation regions of blades. In this paper, the crystallographic behaviors of cooling holes were analyzed by the crystallographic constitutive model. Film cooling holes in the leading edge was simplified to a flat model. The distributions of resolved shear stress along cooling holes and changes under different hole distances were obtained. The results show that stress interference exits among cooling holes clearly. Higher stress areas appear between the centerlines of the cooling holes in two adjacent columns and the lower stress regions as a diamond-shape occur between two cooling holes in the same columns. All the slip systems of octahedral, dodecahedral and hexahedral will be active. And the maximum resolved shear stresses occur at the angle 0o/20o/30o of cooling hole. With horizontal holes distance increasing, the maximum stress around cooling holes decreases. With the vertical holes distance increasing, the maximum stress around cooling holes increases. In all the slip system, the hexahedral slip systems is the most sensitive to hole distances change

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李 磊,侯乃先,敖良波,王心美,岳珠峰.不同孔間距下鎳基單晶葉片氣膜孔彈塑性行為研究[J].稀有金屬材料與工程,2013,42(3):519~523.[Li Lei, Hou Naixian, Ao Liangbo, Wang Xinmei, Yue Zhufeng. Crystallographic Behavior of Nickel Base Single Crystal Blades Film Cooling Holes under Different Hole Distances[J]. Rare Metal Materials and Engineering,2013,42(3):519~523.]
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  • 收稿日期:2012-09-01
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