Investigation Of Influence Of The De-swirl On Flow Inside Co-rotating Cavity

The internal air system has several important functions to perform. These functions includeinternal engine cooling, sealing and control of bearing axial loads.In order to provide the coolingair,the flow design of the internal passages is important. The radial inlet flow in the co-rotating cavityis the important mode. But the total pressure losses increased under the influence of the Coriolis force.This affected the engine performance and it’s safe operation. Therefore, to reduce the total pressurelosses by revising the flow in the cavity is necessary.The theory analyse was progressed for the infection complication of the pressure losses. And thenthe experimentation was progressed. The orderliness of pressure losses alonged with rotate speed andflux was achieved. The numerical simulation was implementary. The reason of the Coriolis forceappears was analysed. Accordingly the de-swirled nozzles and the inner vane were designed Theflow characteristics inside the different de-swirl models were also summed up. The results show that:(1)in the de-swirl nozzle model, the tangential velocity inside cavity can be reduced to a certainamount, but has little change at lower radius;(2) in the de-swirl tube model,the tangential velocitywas limited to the range of tube, but the friction was increased；(3) compared with the de-swirl nozzleand the de-swirl tube,in the inner de-swirl nozzle model,the tangential velocity was reducedobviously and also the pressure losses;(4) the inner vane could reduce the relative tangential velocityand the pressure drop,the commutation was achieved...