用狭缝叶片抑制离心泵扩散器旋转失速

Shunya Takao, S. Konno, S. Ejiri, Masahiro Miyabe
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引用次数: 2

摘要

本研究的目的是通过在扩压叶片上加工狭缝来抑制压力波动,并从流体力学的角度阐明其对扩压叶片旋转失速的影响。为了研究扩压器旋转失速引起的压力波动,对扩压器进行了实验和计算流体力学计算。在实验中,测量了两种泵(原装泵和带缝叶片泵)的特性和静压时程。然后,采用快速傅立叶变换(FFT)分析对波形数据进行处理。静压传感器分两个通道安装在扩压器入口的机匣侧。另一方面,利用商用CFD软件ANSYS CFX进行CFD计算,研究扩压器旋转失速行为和狭缝叶片的影响。在原始泵的情况下,在φ = 0.036附近确认了头流特性的正斜率。另一方面,它已经转移到较低的流量,φ = 0.020在狭缝叶片的情况下。在相同的流量下,两种情况下分别观察到周期性压力波动。根据两流道压力波形的相关关系,确定扩压器发生了旋转失速,且胞数为1。对两种泵进行了非定常reynolds -average Navier-Stokes计算。然后对扩压器内部流动进行了比较,澄清了差异。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Suppression of Diffuser Rotating Stall in a Centrifugal Pump by Use of Slit Vane
The objective of this research is to suppress pressure fluctuation by machining slits to the diffuser vanes and clarify its effect on the diffuser rotating stall from the hydrodynamics point of view. In order to investigate pressure fluctuations due to the diffuser rotating stall, both experiment and CFD (Computational Fluid Dynamics) calculations were conducted. In the experiment, two kinds of pump (one is original and another is with slit vanes) characteristics and time history of static pressure were measured. Then, data processing of wave form were conducted by FFT (Fast Fourier Transform) analysis. The static pressure transducers were mounted at casing-side of diffuser inlet in two passages. On the other hand, the CFD calculations were carried out to investigate the behavior of the diffuser rotating stall and the effect of slit vanes using a commercial CFD software, ANSYS CFX. A positive slope of head-flow characteristics is confirmed around at ϕ = 0.036 in the case of original pump. On the other hand, it has been shifted to lower flow rate, ϕ = 0.020 in the case of slit vanes. The periodic pressure fluctuations were observed for both cases at those flow rate, respectively. Then, it was confirmed that the diffuser rotating stall occurs and the number of cell is one from the co-relation between pressure wave form of two flow passages. The unsteady RANS (Reynolds-averaged Navier-Stokes) calculations were conducted for two kinds of pump. Then the internal flow within the diffuser were compared and the differences were clarified.
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