摘要
针对传统离心泵三维扭曲叶片反问题难以实现,提出了基于自由曲面变形的离心泵三维扭曲叶片反问题方法。将叶片工作面与背面的压力之差作为叶片载荷,依据设计叶片实际载荷与目标载荷间的差值来驱动叶片的变形,依次对叶片前、后盖板流线型线进行变形控制。提出了依据前、后盖板流线型线及叶片进出口边形状对叶片各轴面截线形状进行控制的策略。算例的计算结果表明,通过所提出的反问题方法得到的叶片型线与目标叶型吻合程度较好,在设计工况点及非设计工况点的效率偏差均在0.6%以内,能够较快速、准确地实现离心泵三维扭曲叶片的反问题设计。该研究为离心泵三维扭曲叶片的反问题方法提供了参考。
According to the limitation of the traditional three-dimensional inverse method of centrifugal pump twisted blade, the inverse method based on the free-form deformation is proposed to design the three-dimensional centrifugal pump twisted blade. The difference of pressure between the pressure side and suction side is taken as the blade load. The shroud and hub streamlines are successively deformed according to the difference between the actual blade load and the objective blade load. A new method for controlling the meridian section curves is proposed according to the shroud and hub streamlines and the shape of blade inlet and outlet. The calculation case results show that the blade shape of proposed inverse method is almost similar to the target blade shape.At the design point and non-design points, the differences of efficiency are in the range of 0.6%. So it can quickly achieve the inverse problem of the centrifugal pump three-dimensional twisted blade accurately. This investigation can provide a certain reference for the three-dimensional inverse method of centrifugal pump twisted blade.
引文
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