Laser-Induced Breakdown Spectroscopy for In-Cylinder Equivalence Ratio Measurements in Laser-Ignited Natural Gas Engines

Applied Spectroscopy - Tập 63 Số 5 - Trang 549-554 - 2009
Sachin Joshi1, Daniel B. Olsen1, Cosmin E. Dumitrescu1, Paulius V. Puzinauskas1, Azer P. Yalin1
1Engines and Energy Conversion Laboratory, Department of Mechanical Engineering, Colorado State University, Fort Collins, Colorado 80521 (S.J., D.B.O., A.P.Y.); and Department of Mechanical Engineering, University of Alabama, Tuscaloosa, Alabama 35487 (C.D., P.V.P.)

Tóm tắt

In this contribution we present the first demonstration of simultaneous use of laser sparks for engine ignition and laser-induced breakdown spectroscopy (LIBS) measurements of in-cylinder equivalence ratios. A 1064 nm neodynium yttrium aluminum garnet (Nd:YAG) laser beam is used with an optical spark plug to ignite a single cylinder natural gas engine. The optical emission from the combustion initiating laser spark is collected through the optical spark plug and cycle-by-cycle spectra are analyzed for Hα (656 nm), O (777 nm), and N (742 nm, 744 nm, and 746 nm) neutral atomic lines. The line area ratios of Hα/O777, Hα/N746, and Hα/Ntot (where Ntot is the sum of areas of the aforementioned N lines) are correlated with equivalence ratios measured by a wide band universal exhaust gas oxygen (UEGO) sensor. Experiments are performed for input laser energy levels of 21 mJ and 26 mJ, compression ratios of 9 and 11, and equivalence ratios between 0.6 and 0.95. The results show a linear correlation ( R2 > 0.99) of line intensity ratio with equivalence ratio, thereby suggesting an engine diagnostic method for cylinder resolved equivalence ratio measurements.

Từ khóa


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Thông tin xuất bản

Applied Spectroscopy

Tập 63 Số 5

549-554

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