インタークーラー気流音の低減

抄録

Turbochargers　and　inter-coolers　are　the　devices　used　to　raise　the　engine　output　of　vehicles. An　inter-cooler　raises　air　density　and　improves　air　charge　efficiency　to　engine　cylinders　by cooling　the　air　which　was　compressed　and　heated　by　the　turbocharger. Recently,　the　demand　to　improve　vehicle　quietness　is　becoming　stronger　and　stronger,　the noise　problem　caused　by　the　air　flow　through　the　inter-cooler　is　heavily　focused. Before　this　study,　the　countermeasures　to　lower　noise　level　were　tried,　but　they　were　not　only inefficient,　but　also　increased　the　cost.　ln　our　study,　the　ideal　function　was　discussed　to improve　the　unifomity　of　the　air　flow　in　the　inter-cooler.　As　a　result,　the　optimum　parameter setting　not　only　solve　the　noise　problem　but　also　improved　the　cooling　function　and　reduced the　cost.