Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)
- Volume 22 Issue 9
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- Pages.1290-1306
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- 1998
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- 1226-4881(pISSN)
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- 2288-5324(eISSN)
DOI QR Code
Turbulence Characteristics of a Three-Dimensional Boundary Layer on a Rotating Disk with an Impinging Jet (II) - Turbulence Statistics -
충돌제트를 갖는 회전원판 위 3차원 경계층의 난류특성 (II) - 난류 통계량 -
- Received : 1998.02.02
- Published : 1998.09.01
Abstract
An experimental study has been performed on a three-dimensional boundary layer over a rotating disk with an impinging jet at the center of the disk. The objective of the present study is to investigate the turbulence statistics of the three-dimensional turbulent boundary layer, which may be regarded as one of the simplest models for the flow in turbomachinery. Six components of the Reynolds stresses and ten triple products are measured by aligning the miniature X-wire probe to the mean velocity direction. The ratio of the wall-parallel shear stress magnitude to twice the turbulent kinetic energy in the near-wall region is strongly decreased by the impinging jet. In the case of the free rotating disk flow the shear stress vector lags behind the mean velocity gradient vector in the whole boundary layer, while the lag is weakened as the impinging jet speed increases.
Keywords
- Three Dimensional Boundary Layer;
- Townsend Structural Parameter;
- Eddy Viscosity Ratio;
- Rotating Disk;
- Impinging Jet
- 3차원 경계층;
- Townsend 구조변수;
- 점성비;
- 회전원판;
- 충돌제트;