摘要
Themajorcausesofthesoundpressurelevel(SPL)variationduetothechangesoftheinclinedangleofacircularcylinderandtheaspectratio(ratioofdistancebetweenendplatestocylinderdiameter)wereinvestigated.Thevelocityfluctuationofthewakeandthesurfacepressurefluctuationofthecylinderweremeasuredinalownoisewindtunneltofindthecorrelationlength,coherentoutputpowerandStrouhalnumber.TheresultsshowthatthechangesofthesevaluesqualitativelycorrespondwiththechangeofSPL.Flowvisualizationtestsareperformedtoclarifythevariationofwakeinrelationwithinclinedangleandaspectratio.ItisfoundthatthespanwisestructureofKarman’svortexstreetisbrokendownbytheupwardflowsgeneratedaroundthebottomendplate,andthedegreeoftheinterferencebetweentheupwardflowandKarman’svortexstreetissmallerwhentheaspectratioislarger.
出版日期
2004年02月12日（中国期刊网平台首次上网日期，不代表论文的发表时间）
