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An In Situ Laser-Absorption Sensor for Crank Angle-Resolved Temperature, Pressure, and Humidity in Intake-Runner Flows
- Séan J. Cassady - Stanford University, USA ,
- Daniel H. Cha - Stanford University, USA ,
- Nicolas H. Pinkowski - Stanford University, USA ,
- Christopher L. Strand - Stanford University, USA ,
- Ronald K. Hanson - Stanford University, USA ,
- Xavier Ferlet - Honda Performance Development, USA ,
- Benjamin French - Honda Performance Development, USA ,
- Brad J. Mernone - Honda Performance Development, USA ,
- Alastair Gilmour - Honda Performance Development, USA ,
- Joseph M. Stitt - Honda Performance Development, USA
Journal Article
03-14-04-0034
ISSN: 1946-3936, e-ISSN: 1946-3944
Sector:
Topic:
Citation:
Cassady, S., Cha, D., Pinkowski, N., Strand, C. et al., "An In Situ Laser-Absorption Sensor for Crank Angle-Resolved Temperature, Pressure, and Humidity in Intake-Runner Flows," SAE Int. J. Engines 14(4):551-567, 2021, https://doi.org/10.4271/03-14-04-0034.
Language:
English
Abstract:
Intake-runner fluid dynamics represent a vital component in the global performance of internal combustion engines, but limited diagnostics exist to characterize these gas flows. In this work, a laser absorption-based sensor was developed to measure intake-runner gas temperature, pressure, and water (H2O) mole fraction with crank-angle resolution. The sensor was designed to target two temperature-sensitive 1.8 μm absorption transitions in ambient H2O vapor. A high-resolution study of both lines was conducted, and a novel, multi-harmonic wavelength-modulation-spectroscopy (WMS) detection technique was developed to achieve sensitive measurements at 31 kS/s (once per crank angle degree at 6000 RPM). The sensor was validated in the laboratory across a range of intake-relevant conditions and subsequently demonstrated during dynamometer (dyno) testing of a single-cylinder development engine under motored and fired conditions. Beyond this demonstration, the sensor can readily be adapted for integration with a broad range of engine-intake architectures.