Three-dimensional numerical simulation of stepped dropshaft with different step shapes

The deep tunnel system is increasingly used worldwide for stormwater conveyance and storage, providing a robust and effective means of preventing urban waterlogging. In the system, the dropshaft, with the function of conveying stormwater to the deep tunnels underground, often runs under conditions o...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Jingkang Sun, Shangtuo Qian, Hui Xu, Xiaosheng Wang, Jiangang Feng
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	blade-shaped hydraulic characteristic numerical simulation stepped dropshaft Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506
Acceso en línea:	https://doaj.org/article/986a7e19b42f4697b3744f0c2137aa62
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:986a7e19b42f4697b3744f0c2137aa62
record_format	dspace
spelling	oai:doaj.org-article:986a7e19b42f4697b3744f0c2137aa622021-11-06T07:09:11ZThree-dimensional numerical simulation of stepped dropshaft with different step shapes1606-97491607-079810.2166/ws.2020.336https://doaj.org/article/986a7e19b42f4697b3744f0c2137aa622021-03-01T00:00:00Zhttp://ws.iwaponline.com/content/21/2/581https://doaj.org/toc/1606-9749https://doaj.org/toc/1607-0798The deep tunnel system is increasingly used worldwide for stormwater conveyance and storage, providing a robust and effective means of preventing urban waterlogging. In the system, the dropshaft, with the function of conveying stormwater to the deep tunnels underground, often runs under conditions of high falling head and large discharge. Based on the standard stepped dropshaft, a blade-shaped stepped dropshaft was proposed in order to control the potential standing wave and improve discharge capacity. Its hydraulic characteristics in respect of flow pattern, flow rate distribution, time-averaged pressure and energy dissipation were investigated by numerical simulation. Compared with the standard stepped dropshaft, the blade-shaped stepped dropshaft generated a more uniform flow rate distribution in the radial direction, therefore effectively decreasing the height of the standing wave near the external wall. The negative pressure areas that easily existed on the vertical wall of steps were well controlled. The energy dissipation of the blade-shaped stepped dropshaft was as high as that of the standard stepped dropshaft. Therefore, the blade-shaped stepped dropshaft could be a preferable design for the deep tunnel system. HIGHLIGHTS Report a new kind of stepped dropshaft in deep tunnel systems, namely the blade-shaped stepped dropshaft.; Obtain the hydraulic characteristics of the blade-shaped stepped dropshaft in respect of flow pattern, flow rate distribution, time-averaged pressure and energy dissipation.; Compare with the standard stepped dropshaft to obtain the influence of the step shape on the hydraulic characteristics.;Jingkang SunShangtuo QianHui XuXiaosheng WangJiangang FengIWA Publishingarticleblade-shapedhydraulic characteristicnumerical simulationstepped dropshaftWater supply for domestic and industrial purposesTD201-500River, lake, and water-supply engineering (General)TC401-506ENWater Supply, Vol 21, Iss 2, Pp 581-592 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	blade-shaped hydraulic characteristic numerical simulation stepped dropshaft Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506
spellingShingle	blade-shaped hydraulic characteristic numerical simulation stepped dropshaft Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506 Jingkang Sun Shangtuo Qian Hui Xu Xiaosheng Wang Jiangang Feng Three-dimensional numerical simulation of stepped dropshaft with different step shapes
description	The deep tunnel system is increasingly used worldwide for stormwater conveyance and storage, providing a robust and effective means of preventing urban waterlogging. In the system, the dropshaft, with the function of conveying stormwater to the deep tunnels underground, often runs under conditions of high falling head and large discharge. Based on the standard stepped dropshaft, a blade-shaped stepped dropshaft was proposed in order to control the potential standing wave and improve discharge capacity. Its hydraulic characteristics in respect of flow pattern, flow rate distribution, time-averaged pressure and energy dissipation were investigated by numerical simulation. Compared with the standard stepped dropshaft, the blade-shaped stepped dropshaft generated a more uniform flow rate distribution in the radial direction, therefore effectively decreasing the height of the standing wave near the external wall. The negative pressure areas that easily existed on the vertical wall of steps were well controlled. The energy dissipation of the blade-shaped stepped dropshaft was as high as that of the standard stepped dropshaft. Therefore, the blade-shaped stepped dropshaft could be a preferable design for the deep tunnel system. HIGHLIGHTS Report a new kind of stepped dropshaft in deep tunnel systems, namely the blade-shaped stepped dropshaft.; Obtain the hydraulic characteristics of the blade-shaped stepped dropshaft in respect of flow pattern, flow rate distribution, time-averaged pressure and energy dissipation.; Compare with the standard stepped dropshaft to obtain the influence of the step shape on the hydraulic characteristics.;
format	article
author	Jingkang Sun Shangtuo Qian Hui Xu Xiaosheng Wang Jiangang Feng
author_facet	Jingkang Sun Shangtuo Qian Hui Xu Xiaosheng Wang Jiangang Feng
author_sort	Jingkang Sun
title	Three-dimensional numerical simulation of stepped dropshaft with different step shapes
title_short	Three-dimensional numerical simulation of stepped dropshaft with different step shapes
title_full	Three-dimensional numerical simulation of stepped dropshaft with different step shapes
title_fullStr	Three-dimensional numerical simulation of stepped dropshaft with different step shapes
title_full_unstemmed	Three-dimensional numerical simulation of stepped dropshaft with different step shapes
title_sort	three-dimensional numerical simulation of stepped dropshaft with different step shapes
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/986a7e19b42f4697b3744f0c2137aa62
work_keys_str_mv	AT jingkangsun threedimensionalnumericalsimulationofsteppeddropshaftwithdifferentstepshapes AT shangtuoqian threedimensionalnumericalsimulationofsteppeddropshaftwithdifferentstepshapes AT huixu threedimensionalnumericalsimulationofsteppeddropshaftwithdifferentstepshapes AT xiaoshengwang threedimensionalnumericalsimulationofsteppeddropshaftwithdifferentstepshapes AT jiangangfeng threedimensionalnumericalsimulationofsteppeddropshaftwithdifferentstepshapes
_version_	1718443811799040000

Three-dimensional numerical simulation of stepped dropshaft with different step shapes

Ejemplares similares