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.
关键词
中心锥/波瓣引射器/直升机排气/引射能力/总压损失/热混合效率
Key words
central cone/lobe ejector/helicopter exhaust/ejection capability/total pressure loss/thermal mixing efficiency
维普
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