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在低速轴流风机中 ,前弯动叶和常规径向直叶片比较 ,具有提高效率 4～ 5%,增加变工况范围 1 5～ 2 0 %的优良性能。本文在发展完善“双激盘”理论模型的基础上 ,采用平板圆弧叶型实验数据 ,加入了攻角损失的计算 ,并将其用于前弯动叶片设计工况以及变工况的性能估计。在设计工况下和实验结果比较 ,沿叶高效率的最大误差为 1 .5%,沿叶高总压的最大误差为 1 .8%,两参数沿叶高的流量平均误差分别为 1 %和 1 .5%。在稳定工况范围内按流量平均计算的效率误差和总压误差均在 2 %以内。计算结果表明 ,该法可用于估计变工况下弯掠动叶片的性能 ,是一种简单、明了、适合工程需求的方法。
In the low-speed axial fan, the forward curved blade has the advantages of improving the efficiency by 4~5% and increasing the working range by 15~20% compared with the conventional radial straight blade. On the basis of developing and perfecting the theoretical model of “double disk”, this paper adds the calculation of the angle of attack loss by using the experimental data of the slab circular arc blade and applies it to the design condition of the forward bending blade and the performance of variable working condition estimate. Compared with the experimental results, the maximum error along the leaf efficiency is 1.5% and the maximum error along the total leaf pressure is 1.8%. The average error of the flow rate along the leaf height of the two parameters is 1% And 1.5%. The efficiency error and the total pressure error calculated by the average flow rate in a stable working condition are both within 2%. The calculation results show that this method can be used to estimate the performance of curved blade under varied conditions and is a simple, clear and suitable method for engineering requirements.