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Experimental Investigation of Flow Characteristics in a Turbine Rotor-Stator Cavity with Inlet at Low Radius
Author(s): Haoliang Ren, Jian Chao Zhang, HuiChuan Cheng, JunSheng Chai, Song Fu
Keywords: Rotor-stator cavity, Rotating Reynolds number, Nondimensional mass flow rate, Swirl ratio, Particle image velocimetry
An experimental investigation has been designed and performed to determine the fluid flow characteristics in a rotor-stator cavity with large clearance ratio and inlet at low radius. In this investigation, the particle image velocimetry (PIV) technique is employed for the velocity measurements of airflow in the rotor-stator cavity. Local swirl ratios are calculated from these velocity distributions. A range of parameter combinations of interest in fluid flow characteristics is covered, including combinations of variations in axial location, rotating Reynolds number (denoted as Reφ), and inlet nondimensional mass flow rate (denoted as CW). The results indicate that the flow in the rotor-stator cavity is still dominated by circumferential motion and the radial velocity is quite small. The velocity is basically unchanged along the circumference. However, the velocity increases with the increase of radial position. In different axial positions, the velocity distribution is different. The closer to the rotor, the more uneven the flow in the rotor-stator cavity. The disturbance of the rotor rotating motion to the fluid mainly occurs in the high radius region, which should be paid more attention to in the process of reforming the flow field characteristics. The increase of Reφ is more obvious for the circumferential acceleration of low radius fluid, while the increase of CW will decrease of circumferential velocity of low radius fluid. Both higher Reφ and CW will reduce the radial distribution difference of circumferential velocity. The increment of circumferential velocity along the radial direction decreases with the increase of CW. The swirl ratio fluctuates and increases along the radius increasing direction and tends to a stable value. The swirl ratio in the core region is very close to that in the high radius near the wall region of the rotor, which can be inferred to be caused by the backflow in the rotor-stator cavity.

Journal of Applied Fluid Mechanics

The Journal of Applied Fluid Mechanics (JAFM) is an international, peer-reviewed journal which covers a wide range of theoretical, numerical and experimental aspects in fluid mechanics. The emphasis is on the applications in different engineering fields rather than on pure mathematical or physical aspects in fluid mechanics. Although many high quality journals pertaining to different aspects of fluid mechanics presently exist, research in the field is rapidly escalating.