Two-phase flow structure and operating characteristics of supersonic steam injector

This paper experimentally studies the influence of two-phase flow behavior on the operating limits of steam injector (SI). SI is the passive jet pump with a converging-diverging structure. SI operates without the electrical power and discharges water at high pressure. However, in regard to the opera...

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Autores principales:	Kyosuke SATO, Yutaka ABE, Akiko KANEKO, Tetsuya KANAGAWA, Michitsugu MORI
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2015
Materias:	steam injector nuclear plant safety system passive jet pump two-phase flow direct contact condensation Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/e95524a572ed4b2eae470c5ca58c448f
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spelling	oai:doaj.org-article:e95524a572ed4b2eae470c5ca58c448f2021-11-26T06:30:10ZTwo-phase flow structure and operating characteristics of supersonic steam injector2187-974510.1299/mej.15-00004https://doaj.org/article/e95524a572ed4b2eae470c5ca58c448f2015-07-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/2/5/2_15-00004/_pdf/-char/enhttps://doaj.org/toc/2187-9745This paper experimentally studies the influence of two-phase flow behavior on the operating limits of steam injector (SI). SI is the passive jet pump with a converging-diverging structure. SI operates without the electrical power and discharges water at high pressure. However, in regard to the operating limits of SI, it is unclear which takes into account the discharged flow structure. In this paper, the pressure distributions along the flow direction and the discharge pressure were measured by changing the inlet steam pressure and the load on the exit of the test section. Furthermore, the discharged flow at the diffuser was observed with a high-speed camera. As a result, a boundary was observed in the discharged flow at which the flow structure changed. The area from the throat to this boundary is considered as a two-phase region which steam did not condense completely in the mixing nozzle remained. This boundary moved upstream as the load on the exit increased, and a significant pressure rise occurred at the position where the boundary was reached. In addition, white propagations towards the downstream direction were observed. This propagation is considered as pressure wave propagation. The propagating speed was estimated using image processing. Assuming that the pressure wave propagates at sonic speed, the void fraction at the discharged flow was estimated by the existing model. Based on the above, the influence of the two-phase flow (in the discharged flow structure) on the operating characteristics of SI is discussed.Kyosuke SATOYutaka ABEAkiko KANEKOTetsuya KANAGAWAMichitsugu MORIThe Japan Society of Mechanical Engineersarticlesteam injectornuclear plant safety systempassive jet pumptwo-phase flowdirect contact condensationMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 2, Iss 5, Pp 15-00004-15-00004 (2015)
institution	DOAJ
collection	DOAJ
language	EN
topic	steam injector nuclear plant safety system passive jet pump two-phase flow direct contact condensation Mechanical engineering and machinery TJ1-1570
spellingShingle	steam injector nuclear plant safety system passive jet pump two-phase flow direct contact condensation Mechanical engineering and machinery TJ1-1570 Kyosuke SATO Yutaka ABE Akiko KANEKO Tetsuya KANAGAWA Michitsugu MORI Two-phase flow structure and operating characteristics of supersonic steam injector
description	This paper experimentally studies the influence of two-phase flow behavior on the operating limits of steam injector (SI). SI is the passive jet pump with a converging-diverging structure. SI operates without the electrical power and discharges water at high pressure. However, in regard to the operating limits of SI, it is unclear which takes into account the discharged flow structure. In this paper, the pressure distributions along the flow direction and the discharge pressure were measured by changing the inlet steam pressure and the load on the exit of the test section. Furthermore, the discharged flow at the diffuser was observed with a high-speed camera. As a result, a boundary was observed in the discharged flow at which the flow structure changed. The area from the throat to this boundary is considered as a two-phase region which steam did not condense completely in the mixing nozzle remained. This boundary moved upstream as the load on the exit increased, and a significant pressure rise occurred at the position where the boundary was reached. In addition, white propagations towards the downstream direction were observed. This propagation is considered as pressure wave propagation. The propagating speed was estimated using image processing. Assuming that the pressure wave propagates at sonic speed, the void fraction at the discharged flow was estimated by the existing model. Based on the above, the influence of the two-phase flow (in the discharged flow structure) on the operating characteristics of SI is discussed.
format	article
author	Kyosuke SATO Yutaka ABE Akiko KANEKO Tetsuya KANAGAWA Michitsugu MORI
author_facet	Kyosuke SATO Yutaka ABE Akiko KANEKO Tetsuya KANAGAWA Michitsugu MORI
author_sort	Kyosuke SATO
title	Two-phase flow structure and operating characteristics of supersonic steam injector
title_short	Two-phase flow structure and operating characteristics of supersonic steam injector
title_full	Two-phase flow structure and operating characteristics of supersonic steam injector
title_fullStr	Two-phase flow structure and operating characteristics of supersonic steam injector
title_full_unstemmed	Two-phase flow structure and operating characteristics of supersonic steam injector
title_sort	two-phase flow structure and operating characteristics of supersonic steam injector
publisher	The Japan Society of Mechanical Engineers
publishDate	2015
url	https://doaj.org/article/e95524a572ed4b2eae470c5ca58c448f
work_keys_str_mv	AT kyosukesato twophaseflowstructureandoperatingcharacteristicsofsupersonicsteaminjector AT yutakaabe twophaseflowstructureandoperatingcharacteristicsofsupersonicsteaminjector AT akikokaneko twophaseflowstructureandoperatingcharacteristicsofsupersonicsteaminjector AT tetsuyakanagawa twophaseflowstructureandoperatingcharacteristicsofsupersonicsteaminjector AT michitsugumori twophaseflowstructureandoperatingcharacteristicsofsupersonicsteaminjector
_version_	1718409815538008064

Two-phase flow structure and operating characteristics of supersonic steam injector

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