Diagnostics for Combustion Metrics in Natural Gas Fuelled Reciprocating Engines Argonne National Laboratory

Format:

Conference/Event

Author/Creator:

Bihari, Bihari, author.

Contributor:

Biruduganti, Munidhar

Gupta, Steenath B.

Sekar, Raj R.

Conference Name:

SIAT 2011 (2011-01-19 : Pune, India)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Pune, MH The Automotive Research Association of India 2011

Summary:

Two diagnostics were developed that are particularly suitablefor use with natural gas-fuelled reciprocating engines that areused for power generation applications.The first diagnostic relates flame chemiluminescence tothermodynamic metrics relevant to engine combustion - Heat ReleaseRate (HRR) and in-cylinder bulk gas temperature. Studies wereconducted in a single-cylinder natural gas-fired reciprocatingengine that could simulate turbocharged conditions with Exhaust GasRecirculation. Crank-angle-resolved spectra (266 to 795 nm) offlame luminosity were measured for various operational conditionsby varying the ignition timing for MBT conditions and by holdingthe speed at 1800 rpm and Brake Mean Effective Pressure (BMEP) at12 bar. The effect of dilution on CO₂* chemiluminescenceintensities was studied, by varying the global equivalence ratio(0.6 - 1.0) and by varying the Exhaust Gas Recirculation rate.Though the measured CO₂* chemiluminescence intensities did notcorrelate with in-cylinder bulk gas temperature and Heat ReleaseRate (HRR) on a crank-angle-resolved basis, the peak valuescorrelated extremely well with the peak cycle heat release ratesand to a lesser extent with the peak cycle temperatures. Suchobservations point towards the potential use of flamechemiluminescence to monitor peak bulk gas temperatures, as wellas, peak heat release rates in natural gas-fired reciprocatingengines.A second diagnostic based on Laser-Induced BreakdownSpectroscopy (LIBS) was evaluated to measure in-cylinderequivalence ratio. Following the laser-induced spark ignition eventin a single-cylinder natural gas-fuelled engine that was equippedwith an Exhaust Gas Recirculation (EGR) system, the broadbandemission from the spark kernel was collected and spectrallyresolved. The peaks corresponding to Hα, N and O atoms weremeasured for a range of conditions with global equivalence ratiosranging between 0.6 and 1.0, and for Exhaust Gas Recirculationfractions up to 29%. The (Hα/O) and (Hα/N) peak intensity ratiosfrom the spectral scans correlated extremely well (R₂ 0.97) withlocal oxygen-based equivalence ratios. From the relations that weredeveloped, it appears that for homogenous intake charge, such aLIBS diagnostic enables estimation of EGR rate with the knowledgeof the global equivalence ratio

Notes:

Vendor supplied data

Publisher Number:

2011-26-0007

Access Restriction:

Restricted for use by site license