Numerical study on the effect of steam extraction on hydrodynamic characteristics of rotational supercavitating evaporator for desalination

Тип публикации: статья из журнала

Год издания: 2019

Идентификатор DOI: 10.1016/j.desal.2018.12.012

Ключевые слова: CFD numerical simulation, Hydrodynamic characteristics, Rotational supercavitating evaporator, Steam extraction, Supercavitation, Thermal desalination method

Аннотация: A supercavitation-based thermal desalination method has been put forward, based on which a novel device named Rotational Supercavitating Evaporator (RSCE) has been designed. To investigate the effects of steam extraction on the hydrodynamic characteristics and desalination performance and then determine the ranges of rotational speed and extraction pressure suitable for the operation of RSCE, three-dimensional steady numerical simulations are conducted on the supercavitating flows in RSCE under different rotational speeds and extraction pressures. The results show that steam extraction has little influence on the morphological characteristics and resistance characteristics and is conducive to the generation of the steam in the supercavity. Besides, the steam extraction process enhances the re-entrant jets generated in the region with the radius less than 55 mm under all the rotational speeds other than 3250 r/min and under all the extraction pressures other than 3000 Pa. Despite little change of morphological characteristics, the intensified re-entrant jet increases the length and thickness of the developed supercavity, while decreases the size of the underdeveloped supercavity due to its interaction with the blade. RSCE has low energy consumption when operating under low extraction pressure and the rotational speed of 3750 r/min. © 2019 Elsevier B.V.

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Издание

Журнал: Desalination

Выпуск журнала: Vol. 455

Номера страниц: 1-18

ISSN журнала: 00119164

Издатель: Elsevier B.V.

Авторы

  • Zheng Zhi-Ying (Harbin Inst Technol, Sch Energy Sci & Engn, Harbin 150001, Heilongjiang, Peoples R China; Harbin Inst Technol, Sch Civil Engn, Harbin 150090, Heilongjiang, Peoples R China; Kyoto Univ, Dept Nucl Engn, Kyoto 6158540, Japan)
  • Li Qian (Harbin Inst Technol, Sch Energy Sci & Engn, Harbin 150001, Heilongjiang, Peoples R China)
  • Wang Lu (Harbin Engn Univ, Coll Aerosp & Civil Engn, Harbin 150001, Heilongjiang, Peoples R China)
  • Yao Li-Ming (Heilongjiang Acad Sci, Inst Adv Technol, Harbin 150020, Heilongjiang, Peoples R China)
  • Cai Wei-Hua (Harbin Inst Technol, Sch Energy Sci & Engn, Harbin 150001, Heilongjiang, Peoples R China)
  • Kulagin Vladimir A. (Siberian Fed Univ, Dept Heat Technol & Fluid Dynam, Krasnoyarsk 660041, Russia)
  • Li Hui (Harbin Inst Technol, Sch Civil Engn, Harbin 150090, Heilongjiang, Peoples R China)
  • Li Feng-Chen (Harbin Inst Technol, Sch Energy Sci & Engn, Harbin 150001, Heilongjiang, Peoples R China; Sun Yat Sen Univ, Sino French Inst Nucl Engn & Technol, Zhuhai 519082, Peoples R ChinaArticle)

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