Flow and heat transfer characteristics in a pre-swirl rotor-stator cavity

The present study investigates flow and heat transfer characteristics in a rotor-stator pre-swirl system. Considered are rotational Reynolds numbers Re Phi ranging from 3.4 x 10(5) to 6.8 x 10(5), with jet Reynolds numbers Re-w of approximately 8.8 x 10(4) to 3.81 x 10(5), and associated turbulent flow parameter lambda(T) = C-w/Re Phi(0.8) varying from 0 to 0.4. Experimentally-measured and numerically-predicted results illustrate the combined and separate influences of jet impingement and rotor entrainment, as they affect and govern flow and heat transfer characteristics within the cavity. These results show that the relative strength of the two effects varies with Re Phi, and Re-w, with similar performance for flow conditions with similar magnitudes of the turbulent flow parameter lambda(T). When 0 <lambda(T < )0.27, jet impingement and rotor entrainment both have important influences on flow and heat transfer characteristics. However, when lambda(T) > 0.27, the effects of rotor entrainment are less pronounced.