Influence of Central Cone Configuration on Performance of Lobed Ejector Exhaust System
Lobe ejector exhaust system is widely used in helicopter turboshaft engines,but there are few researches on the use of central cone.Under the condition that the typical lobe ejector geometry remains unchanged,different central cone geometric models were constructed.The effects of four different center cones including hyperbolic,tapered,S-shaped,straight pipe+tapered on the e-jection capacity,total pressure loss and thermal mixing efficiency of the exhaust system of the lobe e-jector were studied by numerical simulation method.The results showed that the hyperbolic central cone was better in ejection capacity and thermal mixing efficiency,but it also brought about greater total pressure loss.In general,the influence of several configurations of central cones on the ejection capacity,mixing effect and total pressure loss of lobed ejectors was small.In engineering applica-tions,the center cone scheme could be selected by comprehensively considering the processing diffi-culty,disassembly and maintenance of different configurations of actual lobed ejectors.
central conelobe ejectorhelicopter exhaustejection capabilitytotal pressure lossthermal mixing efficiency
万方数据
维普
