为了研究亚声速扩压叶栅最佳弯叶片参数与叶栅稠度的关系,在8个不同叶栅稠度下对7组共56个方案进行数值模拟,计算出每个方案下的最佳弯叶片弯高和弯角。计算结果表明:在所选积叠线形式下,在同一个弯角下弯叶片总压损失系数随弯高的增大而减小,弯高为50%时损失最小,最佳弯叶片生成线的弯高为50%;在同一弯高下,弯叶片损失随弯角增大呈现类似抛物线的形式的变化规律,存在最佳弯角(αopt)使叶栅损失最小。在不同的叶栅稠度下,最佳弯角随叶栅稠度增加呈先减小后增大的趋势,弯叶片收益随稠度增大也是先减小再增大的。叶栅稠度对最佳弯角的影响取决于叶栅负荷,叶栅负荷大时影响较大,叶栅负荷较小时影响很小,甚至可以忽略。
In order to research relationship between optimum curved blade generate line and cascade solidity in linear compressor cascade, 56 schemes at 8 different solidity are simulated, the optimum curved height and optimum curved angle are present here. The results show that loss decreases with the curved height increasing at the same curved angle, loss is minimal at the curved height of 50%, the optimum curved height is 50%. Loss variation with curved angle presents a approximate parabola type at the same curved height, there is an optimum curved angle (αopt), at which curved angle loss is minimal. With solidity increasing, optimum angle and benefit of curved angle are both present first decreases, and then increases. The larger the blade loading the larger the influence of the solidity to the optimum curved angle, the lower the blade loading the lower the influence of the solidity to the optimum curved angle.