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Technical Briefs

In-Cylinder Equivalence Ratio Measurements in an EGR Equipped Engine

[+] Author and Article Information
Sreenath B. Gupta

 Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439sgupta@anl.gov

Bipin Bihari, Munidhar Biruduganti, Raj Sekar

 Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439

J. Eng. Gas Turbines Power 133(11), 114504 (May 18, 2011) (5 pages) doi:10.1115/1.4003789 History: Received January 20, 2011; Revised February 28, 2011; Published May 18, 2011; Online May 18, 2011

A single-cylinder natural gas fueled engine equipped with an exhaust gas recirculation (EGR) system was ignited using a laser. The broadband emission from the spark kernel was spectrally resolved, and the peaks corresponding to Hα, N, and O atoms were measured for a range of conditions with global equivalence ratios ranging between 0.6 and 1.0 and for exhaust gas recirculation fractions up to 29%. The (Hα/O) and (Hα/N) peak intensity ratios from the spectral scans correlated extremely well (R2>0.97) with local oxygen based equivalence ratios. Appropriate relations were developed to relate such values to global equivalence ratios and the EGR rate. For a homogeneous intake charge, the present laser induced breakdown spectroscopy diagnostic enables an estimation of one of the two values, global equivalence ratio or EGR rate, with the knowledge of the other.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic representation of engine flows

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Figure 2

Relation between ψ and ϕ for various levels of EGR

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Figure 3

Schematic of the optical arrangement to collect spectral signals. 1: mirror with central hole; 2: cylinder head; 3: laser plug; 4: f=13 mm sapphire lens; 5: f=50 mm quartz lens; and 6: optical fiber.

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Figure 4

(a) H atom signal intensity averaged over 1 μs time window at 656.3 nm. (b) LIBS spectrum obtained with 1 μs delay and 5 μs exposure.

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Figure 5

Correlation of line intensity ratios (Hα/O), (H/N_746), and (H/N_sum) with ψ for cases with EGR≥0

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