Behavior of Fuel Spray Injected by Tailpipe Injector for Post Treatment of Diesel Engine Emissions (Third Report)

-Vaporization Analysis of Impingement Spray on a Wall under High Temperature Ambient Conditions-

Abstract

Secondary Fuel Injection (SFI) is applied to regenerate Diesel Particulate Filter (DPF) which is an after-treatment device of diesel engine. Under this system, ensuring complete evaporation and an optimum mixture distribution in the exhaust line is important. This report focuses on impingement spray in high temperature field to understand its physical phenomena using scattered light photography method and Exciplex fluorescence method with swirl nozzle and n-dodecane. As a result, in evaporation field, the specific vortex of swirl spray disappears after wall impingement in P_inj=1 MPa, but the vortex is maintained in P_inj=4 MPa. And vapor concentration distribution in P_inj=4 MPa is more widely distributed than 1 MPa.