Numerical assessment of cavitation erosion risk using incompressible simulation of cavitating flows
Artikel i vetenskaplig tidskrift, 2020

In this paper, a numerical method to assess the risk of cavitation erosion is proposed, which can be applied to incompressible simulation approaches. The method is based on the energy description of cavitation erosion, which considers an energy transfer between the collapsing cavities and the eroded surface. The proposed framework provides two improvements compared with other published methods. First, it is based on the kinetic energy in the surrounding liquid during the collapse instead of the potential energy of collapsing cavities, which avoids the uncertainty regarding the calculation of the collapse driving pressure in the potential energy equation. Secondly, the approach considers both micro-jets and shock-waves as the mechanisms for cavitation erosion, while previous methods have taken into account only one of these erosion mechanisms. For validation, the proposed method is applied to the cavitating axisymmetric nozzle flow of Franc et al. (2011), and the predicted risk of cavitation erosion is compared with the experimental erosion pattern. This comparison shows that the areas predicted with high erosion risk agree qualitatively well with the experimental erosion pattern. Furthermore, as the current method can be used to study the relationship between the cavity dynamics and the risk of cavitation erosion, the hydrodynamic mechanism responsible for the high risk of cavitation erosion at the inception region of the sheet cavity is investigated in detail. It is shown for the first time that the risk of cavitation erosion in this region is closely tied to the separation of the flow entering the nozzle.

Cavitation erosion

Risk assessment

incompressible simulation

Cavitation

Författare

Mohammad Hossein Arabnejad Khanouki

Chalmers, Mekanik och maritima vetenskaper, Marin teknik

Urban Svennberg

Kongsberg Maritime

Rickard Bensow

Chalmers, Mekanik och maritima vetenskaper, Marin teknik

Wear

0043-1648 (ISSN)

203529

CaFE

Europeiska kommissionen (EU), 2015-01-01 -- 2019-01-01.

Drivkrafter

Hållbar utveckling

Styrkeområden

Transport

Energi

Infrastruktur

C3SE (Chalmers Centre for Computational Science and Engineering)

Ämneskategorier

Tillförlitlighets- och kvalitetsteknik

Strömningsmekanik och akustik

DOI

10.1016/j.wear.2020.203529

Mer information

Skapat

2020-11-21