LATERAL BULKHEAD STRUCTURE OF CASCADE FOR AXIAL FLOW FLUID MACHINE

摘要

PURPOSE:To decrease secondary flow loss by enlarging the lateral bulkhead from the jet port to the blade trailing edge in provision of a jet port between a blade leading edge and a blade trailing edge. CONSTITUTION:The speed distribution at the position to go to a jet port 31 has U1 in the direction of main flow 33, the content of secondary flows 25, 26 near the lateral bulkhead has the distribution of W1. In consequence, flow 40 near the blade surface and the lateral bulkhead becomes cross-flow from the blade ventral side to the blade dorsal side. When the flow reaches the jet port 31, because jet flow with speed Uij streams out through the jet port, the flow 40 near the lateral bulkhead is bent in the direction of jet flow by reason of mixture with jet flow. Further, because of Coanda effect of jet flow, the streams adhering along a bent bulkhead 37, so that the part near to the lateral bulkhead of the main flow 33 is bent in the direction of the lateral bulkhead, the area of the secondary flows becomes smaller. Therefore, the efficiency of fluid machine is improved.