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扩压叶栅最佳弯叶片生成线与展弦比的关系

DOI: 10.13334/j.0258-8013.pcsee.2014.S.022, PP. 153-159

Keywords: 扩压叶栅,负荷,最佳弯高,最佳弯角,展弦比

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Abstract:

为了研究亚声速扩压叶栅最佳弯叶片参数与叶栅展弦比的关系,在7个不同展弦比下对7组共49个方案进行数值模拟。数值模拟结果表明:在同一个弯角下,叶栅损失随弯高的增大而减小,50%弯高时叶栅损失最小,弯叶片最佳弯高为50%;弯叶片弯高相同时,叶栅损失随弯角增大呈现抛物线型变化规律,损失随弯角增大先减小再增大,存在一个最佳弯角(αopt)使叶栅损失最小。最佳弯角与直叶片的负荷展向不均匀度正相关,总体趋势上两者都随叶栅展弦比的增大而减小。但是,展弦比越小端区流动对叶展中部的影响越大,叶片中部的叶型损失增大越明显,弯叶片的弯角越大叶型损失增加越明显,所以小展弦比时最佳弯角随展弦比增大有小幅度增大。

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