Browse Publications Technical Papers 2009-01-1834
2009-06-15

The Spray Behavior of Liquid LPG at Different Back Pressures During Injection in a Constant Volume Chamber 2009-01-1834

In direct injection spark ignition engines (DISI) two different injection strategies are often used. Late injection is used to obtain a stratified charge whereas a homogeneous mixture can be obtained by early injection. One of the main problems is the ignition of the mixture in both situations. The spray contour has to be at a fixed position with respect to the spark plug for the stratified situation.
The results of a research project on a direct fuel injection system for liquid petroleum gas (LPG) in a DISI engine are presented. In the first step of the project two different swirl injectors are tested in a constant volume chamber. The spray penetration and spray angle are determined from high speed images. Flash-boiling of the spray changes the spray angle significantly. Therefore, optimization of the position of the swirl injector tip relative to the spark plug is extremely difficult. In a second phase tests on a single cylinder research engine are recommended to obtain more knowledge about the influence of the direct injection of liquid LPG on the combustion process.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 43% off list price.
Login to see discount.
Special Offer: With TechSelect, you decide what SAE Technical Papers you need, when you need them, and how much you want to pay.
X