High Speed Video Measurements of a Heated Tip Urea Injector Spray Continental Automotive Systems USA

Format:

Conference/Event

Author/Creator:

van Vuuren, van Vuuren, author.

Contributor:

Sayar, Hamid

Conference Name:

SAE 2012 International Powertrains, Fuels & Lubricants Meeting (2012-09-18 : Malmo, Sweden)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2012

Summary:

The recent implementation of new rounds of stringent nitrogenoxides (NOx) emissions reduction legislation in Europeand North America is driving the introduction of new automotiveexhaust aftertreatment systems.One of these technologies comprises a catalyst that facilitatesthe reactions of ammonia (NH₃) with the exhaust nitrogen oxides(NOx) to produce nitrogen (N₂) and water (H₂O). Thistechnology is referred to as Selective Catalytic Reduction (SCR).The ammonia is delivered by a separate fluid supply and injectionsystem to the exhaust in the form of AUS-32 (Aqueous UreaSolution), and is also known under its commercial name of AdBlue®in Europe, and DEF - Diesel Exhaust Fluid - in the USA.The development and application of current production AUS-32injection systems typically rely on spray diagnostics techniquesthat were implemented for the gasoline port injector. These dataare often obtained under standard room temperature conditions.These data are then used as initial conditions for ComputationalFluid Dynamics (CFD) simulations.Up until the present, there had been only limited informationabout urea injector spray quality as the fluid temperature in theinjector increased to typical hot levels in the exhaust-mount ureainjection applications. This paper presents results from high-speedvideo imaging of an AUS-32 injector spray simulating the hotconditions at the injector spray exit for an exhaust injectionapplication.The results show substantial structural differences in thestatic spray between room temperature conditions, and conditionswhere the fluid temperature is approaching and exceeding 100°C.There are also noticeable differences in the post injection phase,which are typically not taken into account by the CFD community,but which could have a significant impact on mixing calculationsand prediction of deposits behavior.The high-speed video imaging setup and results for various sprayconfigurations are described in this paper. The implications forbetter understanding of spray-gas mixing and deposits formation arealso discussed

Notes:

Vendor supplied data

Publisher Number:

2012-01-1747

Access Restriction:

Restricted for use by site license