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Numerical study on morphological characteristics of rotational natural supercavitation by rotational supercavitating evaporator with optimized blade shape

  • Zhi-ying Zheng (郑智颖)
  • Qian Li (李倩)
  • Lu Wang (王璐)
  • Li-ming Yao (姚立明)
  • Wei-hua Cai (蔡伟华)
  • Hui Li (李惠)
  • Feng-chen Li (李凤臣)Email author
Article
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Abstract

Based on supercavitation effect, a novel device named Rotational Supercavitating Evaporator (RSCE) has been designed for desalination. In order to improve the blade shape of rotational cavitator in RSCE for performance optimization, the blade shapes with different sizes are designed by utilizing the improved calculation method for the blade shape and the validated empirical formulae obtained by previous two-dimensional numerical simulations, from which the optimized blade shape with the wedge angle of 45º and design speed of 5000 r/min is selected. The estimation method for the desalination performance parameters is established to validate the feasibility of the utilization of the results obtained by two-dimensional numerical simulations in the design of three-dimensional blade shape. Three-dimensional numerical simulations are then conducted on the supercavitating flows around the rotational cavitator with the optimized blade shape under different rotational speeds to obtain the morphological characteristics of rotational natural supercavitation. The results show that the profile of the supercavity tail is concaved toward the inside of the supercavity due to the re-entrant jet. The empirical formulae of supercavity size with account of rotation are fitted, in which the exponents deviate from those obtained by previous two-dimensional numerical simulations. The influences of rotation on the morphological characteristics are analyzed from the perspectives of the tip and hub vortices and the interaction between the supercavity tail and the blade. Further numerical simulation on the supercavitating flow around the rotational cavitator made up by the blades with uniform thickness of exit edge illustrate that the morphological characteristics are also affected by the blade shape.

Key words

Rotational natural supercavitation morphological characteristics blade shape CFD numerical simulation rotational supercavitating evaporator 

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Copyright information

© China Ship Scientific Research Center 2019

Authors and Affiliations

  • Zhi-ying Zheng (郑智颖)
    • 1
    • 2
    • 3
  • Qian Li (李倩)
    • 1
  • Lu Wang (王璐)
    • 4
  • Li-ming Yao (姚立明)
    • 5
  • Wei-hua Cai (蔡伟华)
    • 1
  • Hui Li (李惠)
    • 2
  • Feng-chen Li (李凤臣)
    • 6
    • 1
    Email author
  1. 1.School of Energy Science and EngineeringHarbin Institute of TechnologyHarbinChina
  2. 2.School of Civil EngineeringHarbin Institute of TechnologyHarbinChina
  3. 3.Department of Nuclear EngineeringKyoto UniversityKyotoJapan
  4. 4.College of Aerospace and Civil EngineeringHarbin Engineering UniversityHarbinChina
  5. 5.Institute of Advanced TechnologyHeilongjiang Academy of SciencesHarbinChina
  6. 6.Sino-French Institute of Nuclear Engineering and TechnologySun Yat-Sen UniversityZhuhaiChina

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