The effect of flow oscillations on cavity drag

DOI Web Site 被引用文献3件

書誌事項

公開日
1987-04
権利情報
  • https://www.cambridge.org/core/terms
DOI
  • 10.1017/s002211208700106x
公開者
Cambridge University Press (CUP)

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説明

<jats:p>An experimental investigation of flow over an axisymmetric cavity shows that self-sustained, periodic oscillations of the cavity shear layer are associated with low cavity drag. In this low-drag mode the flow regulates itself to fix the mean-shear-layer stagnation point at the downstream corner. Above a critical value of the cavity width-to-depth ratio there is an abrupt and large increase of drag due to the onset of the ‘wake mode’ of instability. It is also shown by measurement of the momentum balance how the drag of the cavity is related to the state of the shear layer, as defined by the mean momentum transport <jats:inline-formula id="ffm1">$\rho\overline{u}\overline{v}$</jats:inline-formula> and the Reynolds stress <jats:inline-formula id="ffm2">$\rho\overline{u^{\prime}v^{\prime}}$</jats:inline-formula>, and how these are related to the amplifying oscillations in the shear layer. The cavity shear layer is found to be different, in several respects, from a free shear layer.</jats:p>

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