Forschungs- & Entwicklungsinformationsdienst der Gemeinschaft - CORDIS

Experimental investigation of the effects of different injection strategies on NOx emissions, instantaneous piston wall temperature, instantaneous heat transfer coefficient, and flame temperature

The task of Chalmers University of Technology was the creation of an experimental database for a 2.02 l single cylinder D.I. diesel research engine. This database can be used for validation and verification of numerical models in order to improve NOx predictions. Due to the different requirements of the used measurement methods, the experimental work had to be divided into three different parts.

Part 1:
The research engine was instrumented with a thermo-piston. Two different thermo-pistons (Nr. 1 and Nr. 2) were used during the time of the project.

Measurements were made after a stabilization period of around 5-10 minutes and they include:
- Measuring of the local, crank angle resolved temperature at the piston surface and cylinder head.
- Measuring of the exhaust emissions.
- Conventional measurements (cylinder pressure, &), to allow the calculation of the heat loses to the coolant, oil, and exhaust gas.

Part 2:
The research engine was instrumented with a thermo-piston. An endoscope was inserted into the cylinder head to allow flame imaging. Due to problems with soot deposition on the protection window of the endoscope, the engine was first stabilized under motoring conditions and flame images were taken after a short stabilization time under firing conditions.
- Determination of the sooting flame temperature, and the soot KL factor using two-colour pyrometry

Part 3
The engine block and the cylinder head had to be changed to allow optical access through the liner and the cylinder head. Measurements were made under motoring conditions and include:
- LDA measurements of the flow field in the combustion chamber.

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Chalmers University of Technology
Hörsalsvägen 7
41296 Göteborg
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