Transient Gas-liquid Flow in Helical Axial Pump Diffuser and Its DMD Analysis

doi:10.6041/j.issn.1000-1298.2020.09.014

	Transient Gas-liquid Flow in Helical Axial Pump Diffuser and Its DMD Analysis
	Zhang, Renhui 1,2; Wang, Shaohua 1; Osman, Juma S A 1
刊名	Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
	2020-09-25
卷号	51 期号:9 页码:118-126
关键词	Axial flow Decomposition Diffusers (fluid) Flow fields Modal analysis Pumps Stators Velocity Characteristics of flow fields Flow field distribution Gas liquid two-phase flows Rotor-stator interactions Steady state characteristics Steady-state flow field Transient flow characteristics Unsteady characteristics
ISSN号	10001298
DOI	10.6041/j.issn.1000-1298.2020.09.014
英文摘要	In order to analyze the unsteady characteristics of helical axial pump, numerical simulation of unsteady gas-liquid two phase flow in helical axial pump was carried out, and the flow field distributions of different blade heights at different flow rates were obtained. Dynamic modal decomposition (DMD) was used to decompose the transient velocity field under the condition of flow rate of 100 m3/h and gas content of 30%. The first four major modes and their corresponding frequency information were obtained which can reflect the main flow characteristics. The characteristics of flow field in diffuser can be divided into dissipative modal, basic static modal and high order dynamic modal. The dissipative modal attenuated gradually with time and had little influence on the development of the flow field. The basic mode was the steady-state characteristic with a frequency of 0, which reflected the characteristics of steady state flow field caused by flow passage. The order three and order four dynamic modes reflected the rotor-stator interaction between impeller and diffuser. It gradually dissipated in the process of continuous downstream development of diffuser, and the effect of rotor-stator interaction on downstream flow of guide blade was small. The main modal field characteristics and frequency information were obtained by decomposing the phase field. The characteristics of the basic static modal field showed that on a section with a large guide blade height, the higher the velocity was, the lower the gas content was. The dynamic modal characteristics of the phase field were basically consistent with those of the velocity field. The DMD method can clearly analyze the complex transient flow characteristics in the guide vane of helical axial pump. © 2020, Chinese Society of Agricultural Machinery. All right reserved.
语种	中文
出版者	Chinese Society of Agricultural Machinery
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/115093]
专题	能源与动力工程学院
作者单位	1.College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou; 730050, China; 2.Key Laboratory of Fluid Machinery and Systems of Gansu Province, Lanzhou University of Technology, Lanzhou; 730050, China
推荐引用方式 GB/T 7714	Zhang, Renhui,Wang, Shaohua,Osman, Juma S A. Transient Gas-liquid Flow in Helical Axial Pump Diffuser and Its DMD Analysis[J]. Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery,2020,51(9):118-126.
APA	Zhang, Renhui,Wang, Shaohua,&Osman, Juma S A.(2020).Transient Gas-liquid Flow in Helical Axial Pump Diffuser and Its DMD Analysis.Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery,51(9),118-126.
MLA	Zhang, Renhui,et al."Transient Gas-liquid Flow in Helical Axial Pump Diffuser and Its DMD Analysis".Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 51.9(2020):118-126.