Exhaust aftertreatment device with star-plugged turbulator

An exhaust aftertreatment device comprising:

• a housing having an upstream inlet for receiving exhaust, and a downstream outlet for discharging said exhaust;
• an aftertreatment element in said housing for treating said exhaust;
• an injector in said housing upstream of said aftertreatment element and injecting chemical species mixing with said exhaust prior to reaching said aftertreatment element;
• a turbulator in said housing between said injector and said aftertreatment element, said turbulator comprising a tube having a perforated star-plugged downstream end, wherein:
• said housing and said tube extend coaxially along an axis;
• said housing comprises an upstream housing section and an aftertreatment element housing section meeting at a junction;
• said injector has an injection tip in said upstream housing section, said injection tip being upstream of said junction;
• said aftertreatment element is in said aftertreatment housing section;
• said tube has an upstream segment, an intermediate segment, and a downstream segment;
• said upstream segment of said tube provides said upstream housing section;
• said intermediate segment of said tube extends axially through and into said aftertreatment housing section at said junction of said upstream and aftertreatment housing sections;
• said aftertreatment housing section has a sidewall spaced radially outwardly of said intermediate segment and said downstream segment of said tube by an annular gap therebetween;
• said downstream segment of said tube provides said perforated star-plugged downstream end;
• said downstream segment of said tube is axially spaced from said junction of said upstream and aftertreatment housing sections by said intermediate segment of said tube therebetween.