Abstract
The forces exerted upon a cascade of hydrofoils in supercavitating flow are analysed by considering momentum changes in the flow between stations upstream and downstream of the cascade. Unlike potential flow models the momentum model takes account of turbulent mixing of the wake with the outer flow (as occurs in real flow) and it is possible to calculate the resulting energy losses. Unfortunately, however, this global approach does not permit cavity lengths to be estimated. A semi-empirical theory is developed which allows lift and drag force cavitation characteristics to be calculated for flat plate cascades. Experimental results are compared with theoretical predictions from the momentum theory and from both linear and non-linear potential flow theories.
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