Vortex-induced energy loss of a mixed-flow waterjet pump under different operating conditions

doi:10.1007/s10409-023-23064-x

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	Vortex-induced energy loss of a mixed-flow waterjet pump under different operating conditions
	Kan, Kan ; Xu, Yuhang ; Xu, Hui ; Feng, Jiangang ; Yang ZX(杨子轩)
刊名	ACTA MECHANICA SINICA ; 9
	2023-09
卷号	39 页码:323064
关键词	Mixed-flow waterjet pump Entropy production Turbulence dissipation Enstrophy transport
ISSN号	0567-7718
DOI	10.1007/s10409-023-23064-x
英文摘要	Mixed-flow waterjet pumps (M-FWPs) are core units of high-speed ship power propulsion. When operated under non-optimal operating conditions, the unstable flow generated in the flow passage leads to a reduction in pump efficiency. This article investigates the energy loss mechanism of M-FWPs under different operating conditions through entropy production theory based on numerical simulations. The analyses of the simulation data show that the turbulence dissipation (EPTD) makes the dominant contribution to the entropy production rate. By comparing the correlations of velocity gradient, vorticity, and turbulent kinetic energy (TKE) with the EPTD, it is discovered that under non-optimal operating conditions, the inflow angle at the impeller inlet does not match the blade inlet angle at the leading edge of the blade, resulting in unsteady flow structures such as flow separation and large-scale vortices. The increase in vorticity and TKE caused by these unsteady structures ultimately causes the generation of turbulent entropy. Further examination of the enstrophy transport equation indicates that the relative vortex generation term plays a dominant role in the development of the unsteady flow in the flow passage.
分类号	二类
WOS研究方向	Engineering, Mechanical ; Mechanics
语种	英语
WOS记录号	WOS:001004816600003
资助机构	National Natural Science Foundation of China [52009033, 11972038] ; Natural Science Foundation of Jiangsu Province [BK20200509] ; Postdoctoral Research Foundation of China [2022M711021, 2021M690876]
其他责任者	Yang, ZX (corresponding author), Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China.
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/92408]
专题	力学研究所_非线性力学国家重点实验室
作者单位	1.{Yang Zixuan} Chinese Acad Sci Inst Mech Beijing 100190 Peoples R China 2.{Xu Hui, Feng Jiangang} Hohai Univ Coll Agr Sci & Engn Nanjing 210098 Peoples R China 3.{Kan Kan, Xu Hui} Hohai Univ Coll Water Conservancy & Hydropower Engn Nanjing 210098 Peoples R China 4.{Kan Kan, Xu Yuhang} Hohai Univ Coll Energy & Elect Engn Nanjing 211100 Peoples R China
推荐引用方式 GB/T 7714	Kan, Kan,Xu, Yuhang,Xu, Hui,et al. Vortex-induced energy loss of a mixed-flow waterjet pump under different operating conditions[J]. ACTA MECHANICA SINICA, 9,2023,39:323064.
APA	Kan, Kan,Xu, Yuhang,Xu, Hui,Feng, Jiangang,&杨子轩.(2023).Vortex-induced energy loss of a mixed-flow waterjet pump under different operating conditions.ACTA MECHANICA SINICA,39,323064.
MLA	Kan, Kan,et al."Vortex-induced energy loss of a mixed-flow waterjet pump under different operating conditions".ACTA MECHANICA SINICA 39(2023):323064.