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CARS temperature measurements in the unburned gas region of an internal combustion engine

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Abstract

Broadband coherent anti-Stokes Raman scattering (CARS) temperature measurements have been performed in the unburned gas region of an internal combustion engine. At the temperatures and pressures of interest, it is difficult to measure temperature accurately because temperature information is contained primarily in the shape of the nitrogen fundamental band, which is significantly affected by collisional narrowing. The results of the CARS measurements are compared to the predictions of a detailed engine heat release model. Such heat release models are widely used in the automotive industry to predict engine performance and efficiency. The temperature predictions of such models have not, to our knowledge, previously been compared to spatially and temporally resolved temperature measurements in operating engines.

© 1986 Optical Society of America

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