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  • To provide comprehensive experimental measurements of flow, heat flux characteristics and NOx emissions for gasoline engines including detailed study of heat fluxes to cylinder head. Standard engine
FP5

MINNOX Report Summary

Project ID: ENK6-CT-2001-00530
Funded under: FP5-EESD
Country: Germany

To provide comprehensive experimental measurements of flow, heat flux characteristics and NOx emissions for gasoline engines including detailed study of heat fluxes to cylinder head. Standard engine

The purpose of this working package is to deliver measuring results of the surface temperature of the combustion chamber for 3-D simulations. With these measurements the models for heat transfer in 3-D-calculations could be controlled and calibrated. Exactly knowing of the local heat transfer is necessary to predict NOx emissions within 3D-calculations.

An innovative surface temperature method using special surface thermocouples have been applied to the engine for measuring the local instantaneous heat flux.
For measuring 121 surface thermocouples had been applied to a special cylinder head. Because of the extremely low mass of the sensors fast measuring, i.e. with a resolution of 1 °CA, was possible.

The effect of the flame propagation on the local heat transfer had been intensively analysed under various operating conditions and also under various flow field conditions. This was realized with different intake duct geometry (tumble sheet).
It had been necessary to apply an eligible engine to fit the existing cylinder head. The engine and the measuring equipment had build up and the measurements had been carried out.

For every engine operating point a burn rate analysis had been calculated. Furthermore, heat flux at every sensor point on the combustion chamber surface had been calculated.

The used measurement technology is also usable for temperature measurement at other engine components, for example fuel injectors, to determine the thermal load of such components.

The few publications available where a comparable number of measuring points were used are published in the early 1980´s. In this time it was technically not possible to record all of the signals simultaneously. The only chance was to sample the signals, which made it impossible to evaluate single cycles and made an extreme measuring time necessary to collect all the data (several minutes).

In this project, for the first time ever, it was possible to record more then 100 sensor positions (121) simultaneously with a resolution of 1°CA.

Related information

Reported by

UNIVERSITAET STUTTGART
Pfaffenwaldring 12
70569 STUTTGART
Germany
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