Gas-phase saturation and evaporative cooling effects during wet compression of a fuel aerosol under RCM conditions

Goldsborough, S. Scott; Johnson, Michael; Zhu, Guojun

doi:10.1016/j.combustflame.2010.07.018

Cited by 8 publications

(19 citation statements)

References 44 publications

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“…They also noted that the evaluation of the compressed gas temperature can be complicated because of the cooling effects associated with evaporation of the droplets. The concept of aerosol RCMs and the near-droplet phenomena, including evaporation and fuel vapor transport into the surrounding gas were later studied through a droplet vaporization model developed by Goldsborough et al [158,159]. These studies provided guidelines on experimental configurations and the interpretation of data.…”

Section: Aerosol Fueling and Direct Test Chamber Methodsmentioning

confidence: 99%

Advances in rapid compression machine studies of low- and intermediate-temperature autoignition phenomena

Goldsborough

Hochgreb

Vanhove

et al. 2017

Progress in Energy and Combustion Science

197

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Rapid compression machines (RCMs) are widely-used to acquire experimental insights into fuel autoignition and pollutant formation chemistry, especially at conditions relevant to current and future combustion technologies. RCM studies emphasize important experimental regimes, characterized by lowto intermediate-temperatures (600-1200 K) and moderate to high pressures (5-80 bar). At these conditions, which are directly relevant to modern combustion schemes including low temperature combustion (LTC) for internal combustion engines and dry low emissions (DLE) for gas turbine engines, combustion chemistry exhibits complex and experimentally challenging behaviors such as the chemistry attributed to cool flame behavior and the negative temperature coefficient regime. Challenges for studying this regime include that experimental observations can be more sensitive to coupled physicalchemical processes leading to phenomena such as mixed deflagrative/autoignitive combustion. Experimental strategies which leverage the strengths of RCMs have been developed in recent years to make RCMs particularly well suited for elucidating LTC and DLE chemistry, as well as convolved physicalchemical processes. Specifically, this work presents a review of experimental and computational efforts applying RCMs to study autoignition phenomena, and the insights gained through these efforts. A brief history of RCM development is presented towards the steady improvement in design, characterization, instrumentation and data analysis. Novel experimental approaches and measurement techniques, coordinated with computational methods are described which have expanded the utility of RCMs beyond empirical studies of explosion limits to increasingly detailed understanding of autoignition chemistry and the role of physical-chemical interactions. Fundamental insight into the autoignition chemistry of specific fuels is described, demonstrating the extent of knowledge of low-temperature chemistry derived from RCM studies, from simple hydrocarbons to multi-component blends and full-boiling range fuels. Emerging needs and further opportunities are suggested, including investigations of under-explored fuels and the implementation of increasingly higher fidelity diagnostics.

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Section: Aerosol Fueling and Direct Test Chamber Methodsmentioning

confidence: 99%

Advances in rapid compression machine studies of low- and intermediate-temperature autoignition phenomena

Goldsborough

Hochgreb

Vanhove

et al. 2017

Progress in Energy and Combustion Science

197

View full text Add to dashboard Cite

show abstract

“…The results of this work can be used to aid the successful design and operation of aerosol RCMs. Previous studies by our group have investigated effects of physical parameters where n-dodecane, a relatively small involatile hydrocarbon, was used as the fuel [17,18]. In those studies it was shown that smaller droplets are more affected by gasphase fuel stratification and evaporative cooling while larger droplets result in greater gas-phase compositional and thermal stratification.…”

Section: Introductionmentioning

confidence: 99%

“…Three diluent gases including nitrogen, neon and argon are studied while oxygen mole fractions of 21% are used as the balance of the non-fuel gas. Initial droplet diameters of d 0 = 3 and 8μm are considered based on results of our previous studies [18]. These droplet sizes are much smaller than typically produced by fuel injectors, but could be created via an ultra-sonic nebulizing system or similar device (e.g., see ref.…”

Section: Introductionmentioning

confidence: 99%

Fuel and diluent property effects during wet compression of a fuel aerosol under RCM conditions

Goldsborough

Johnson

Zhu

2012

Fuel

Self Cite

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“…Utamura et al [16] showed experimentally that 1% of injection ratio in wet compression leads to 8% increase in power delivery. Wet compression in gas turbines has been thoroughly investigated recently [17][18][19][20][21][22][23][24]. White and Meacock [25] developed a model for the transient operations of the non-equilibrium wet compression process based on droplet evaporation, and Kim et al [26] obtained the analytic expressions with algebraic equations as solutions.…”

Section: Introductionmentioning

confidence: 99%

Analytical modeling and assessment of overspray fogging process in gas turbine systems

Kim

2015

J. Engin. Thermophys.

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In this study, analysis of the overspray fogging process, which consists of inlet fogging and wet compression processes in gas turbine cycle, is carried out with a non-equilibrium analytical modeling based on liquid droplet evaporation. The transient behaviors of droplet diameter and air temperature are examined. Special attention is paid to the effects of system parameters such as pressure ratio, water injection ratio, and initial droplet diameter on the process performances, including evaporation time of droplets, compressor outlet temperature, and compression work. Process performances are also estimated under the condition of critical water injection ratio above which complete evaporation of injected water droplets within a compressor is not possible. The analytical results indicate that the overspray fogging process has a potential of lowering compressor outlet temperature and saving significant compression work when compared to dry compression, and this technique is more effective for a higher pressure ratio and smaller size of injected water droplet.

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Gas-phase saturation and evaporative cooling effects during wet compression of a fuel aerosol under RCM conditions

Cited by 8 publications

References 44 publications

Advances in rapid compression machine studies of low- and intermediate-temperature autoignition phenomena

Advances in rapid compression machine studies of low- and intermediate-temperature autoignition phenomena

Fuel and diluent property effects during wet compression of a fuel aerosol under RCM conditions

Analytical modeling and assessment of overspray fogging process in gas turbine systems

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