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Hybrid fs/ps rotational CARS temperature and oxygen measurements and soot LII measurements in a turbulent C2H4-fueled jet flame

54th AIAA Aerospace Sciences Meeting

Kearney, Sean P.; Hoffmeister, K.N.G.; Guildenbecher, Daniel R.; Winters, Caroline; Grasser, Thomas; Hewson, John C.

We present a detailed set of measurements from a piloted, sooting, turbulent C2H4-fueled jet flame. Hybrid femtosecond/picosecond coherent anti-Stokes Raman scattering (CARS) is used to monitor temperature and oxygen, while laser-induced incandescence (LII) is applied for imaging of the soot volume fraction in the challenging jet-flame environment at Reynolds number, Re = 20,000. A new dual-detection channel CARS instrument provides the enhanced dynamic range required in this highly intermittent and turbulent environment. LII measurements are made across a wide field of view requiring us to account for spatial variation in the soot-volume-fraction response of the instrument. Single-laser-shot results are used to illustrate the mean and rms statistics, as well as probability densities of all three measured quantities. LII data from the soot-growth region of the jet are used to benchmark the soot source term for one-dimensional turbulence (ODT) modeling of this turbulent flame. The ODT code is then used to predict temperature, oxygen and soot fluctuations within the soot oxidation region higher in the flame.

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TYPE Conference Poster YEAR 2016
OSTIScopus

Growth of mono- and mixed cultures of Nannochloropsis salina and Phaeodactylum tricornutum on struvite as a nutrient source

Bioresource Technology

Davis, Ryan W.; Siccardi, Anthony J.; Huysman, Nathan D.; Wyatt, Nicholas B.; Hewson, John C.; Lane, Todd

The suitability of crude and purified struvite (MgNH4PO4), a major precipitate in wastewater streams, was investigated for renewable replacement of conventional nitrogen and phosphate resources for cultivation of microalgae. Bovine effluent wastewater stone, the source of crude struvite, was characterized for soluble N/P, trace metals, and biochemical components and compared to the purified mineral. Cultivation trials using struvite as a major nutrient source were conducted using two microalgae production strains, Nannochloropsis salina and Phaeodactylum tricornutum, in both lab and outdoor pilot-scale raceways in a variety of seasonal conditions. Both crude and purified struvite-based media were found to result in biomass productivities at least as high as established media formulations (maximum outdoor co-culture yield ~20±4gAFDW/m2/day). Analysis of nutrient uptake by the alga suggest that struvite provides increased nutrient utilization efficiency, and that crude struvite satisfies the trace metals requirement and results in increased pigment productivity for both microalgae strains.

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TYPE Journal Article YEAR 2015
DOIOSTIScopus
Results 151–175 of 261
Results 151–175 of 261
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