Work

Quantification of the boundary layer on a tripped generic submarine sail

Year: 2024

Type: conference-paper

Abstract: : Boundary-layer transition to separation over the appendages of a submarine can affect manoeuvrability and drag. It is of interest to stimulate the boundary layer in model-scale testing so that it is more representative of the turbulent state at full scale. This paper explores the effect of Hama trips on boundary-layer transition by using a NACA0021 profile which matches the sail geometry of a generic benchmark submarine known as the BB2. The boundary layer is measured by a Pitot tube and flow transition is assessed by infrared thermography. Key results show that, with a suitable trip height and location, the fully turbulent boundary layer yields a reasonable collapse over a range of chord-length Reynolds numbers. The effectiveness of two different trip heights is presented in the form of a performance chart for Reynolds number vs trip location. Keywords: boundary layer, wind tunnel, infrared thermography

Source: Zenodo (CERN European Organization for Nuclear Research)

DOI: 10.5281/zenodo.14213400

Authors: Christopher Brown, Henry Ng, Pier Marzocca, Christopher Purser

Institutions: RMIT University, University of Liverpool, Defence Science and Technology Group

Language: English

Topic: Fluid Dynamics and Turbulent Flows

Subfield: Computational Mechanics

Field: Engineering

Domain: Physical Sciences

Open Access status: green

OpenAlex ID: W6930622792

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