Suppression of performance curve instability of a mixed flow pump by use of J-groove
Suppression of performance curve instability of a mixed flow pump by use of J-groove
复制标题
DOI：
10.1115/1.1287855
复制
发表时间：
2000-09
影响因子：
2
通讯作者：
S. Saha;J. Kurokawa;J. Matsui;H. Imamura
中科院分区：
文献类型：
--
作者：
S. Saha;J. Kurokawa;J. Matsui;H. Imamura
为了控制和抑制混流泵以扬程-流量曲线正斜率为特征的性能曲线不稳定性，提出了一种非常简单的被动方法，即在平行于压力梯度的壳体壁上设置浅槽(J型槽)。通过实验确定了抑制这种不稳定性的最佳沟槽尺寸和位置。结果表明，在不降低泵最大效率的情况下，适当尺寸和位置的浅槽可以很好地抑制这种不稳定性。浅槽的显著效果是通过槽内逆流和旋流的混合而产生的角动量吸收，降低了叶轮进口区域的旋流强度和逆流传播，使叶轮理论扬程得到恢复。
In order to control and suppress performance curve instability characterized by the positive slope of head-capacity curve of a mixed flow pump, a very simple passive method utilizing shallow grooves mounted on a casing wall parallel to the pressure gradient (J-groove) is proposed. The optimum groove dimension and location for suppressing such an instability are determined experimentally. Results show that shallow grooves of adequate dimension and proper location can suppress such instability perfectly without decreasing the pump maximum efficiency, The remarkable effect of shallow grooves is to decrease both the swirl strength and the propagation of reverse flow at the impeller inlet region, through angular momentum absorption owing to mixing of groove reverse flow and swirl flow, yielding recovery of impeller theoretical head