INLET PRE-ROTATION INFLUENCE ON THE FLOW AND HEAT TRANSFER IN A ROTATING CAVITY
In order to get better knowledge of the flow and heat transfer in the rotating cavity an experimental rig is set up in the Institute of Steam and Gas Turbines at RWTH Aachen University. The rotating cavity with cooling air axial through flow is bound by two plane discs and a cylindrical shroud. The corresponding 3D time-dependent numerical investigation is carried out using a commercial CFD code, Fluent, with the RNG k-ε turbulence model. The influence of the inlet air pre-rotation on the flow pattern and the heat transfer in the cavity is analyzed. The sophisticated unstable flow patterns with cyclonic and anti-cyclonic circulations are captured in experiments and numerical simulations. Only one pair of circulations is observed in the simulations without inlet pre-rotation, two and three pairs of circulations are observed in the simulations of the inlet air with the same pre-rotational speed as the rotating cavity, i.e. full inlet pre-rotation. The numerical heat transfers are in reasonable agreement with the experiments. The local Nusselt numbers Nu on disks show basically an increasing radius distribution for the disks heated with radial increasing temperature profile. The simulations without inlet pre-rotation overestimate the heat transfer in the middle region of the disks and the simulations with full inlet pre-rotation overestimate the heat transfer in the region near the shroud. To get an accurate CFD simulation of the flow and heat transfer in rotating cavities, it is suggested that the inlet pre-rotation be a fraction of the rotational speed of the disks.
buoyancy pre-rotation rotating cavity unstable flow turbine
Dieter Bohn Shuqing Tian
Institute of Steam and Gas Turbines RWTH Aachen University RWTHAchen University Templeraben 55 D-52056 Aachen,Germany
国际会议
The 3rd International Symposium on Jet Propulsion and Power Engineering(第三届喷气推进与动力工程国际会议 ISJPPE)
南京
英文
6-12
2010-09-13（万方平台首次上网日期，不代表论文的发表时间）