Gasdynamic stimulation of combustion of lean fuel mixtures. 2. Evaluation of thermodynamic parameters and the magnitude of heat losses

2000 ◽  
Vol 73 (2) ◽  
pp. 299-302
Author(s):  
O. V. Achasov ◽  
T. Kageyama ◽  
S. A. Labuda ◽  
T. Taillefet ◽  
F. Fisson
Keyword(s):  
Thermodynamic Parameters ◽  
Heat Losses ◽  
Lean Fuel ◽  
Fuel Mixtures ◽  
Stimulation Of

Gasdynamic stimulation of combustion of lean fuel mixtures. 1. experimental study

2000 ◽  
Vol 73 (2) ◽  
pp. 293-298
Author(s):  
O. V. Achasov ◽  
T. Kageyama ◽  
S. A. Labuda ◽  
T. Taillefet ◽  
F. Fisson
Keyword(s):  
Experimental Study ◽  
Lean Fuel ◽  
Fuel Mixtures ◽  
Stimulation Of

scholarly journals Combustion of lean fuel mixtures with subcritical streamer microwave discharge

2021 ◽  
Vol 1047 (1) ◽  
pp. 012052
Author(s):  
P V Bulat ◽  
I I Esakov ◽  
L P Grachev ◽  
K N Volkov
Keyword(s):  
Microwave Discharge ◽  
Lean Fuel ◽  
Fuel Mixtures

Ignition of Lean Methane-Based Fuel Blends at Gas Turbine Pressures

2005 ◽  
Author(s):  
Eric L. Petersen ◽  
Joel M. Hall ◽  
Schuyler D. Smith ◽  
Jaap de Vries ◽  
Anthony Amadio ◽  
...  
Keyword(s):  
Gas Turbine ◽  
Oxidation Kinetics ◽  
Rate Coefficients ◽  
Fuel Blends ◽  
Reflected Shock ◽  
Ignition Delay Times ◽  
Lean Fuel ◽  
Fuel Mixtures ◽  
Kinetics Of ◽  
Good Agreement

Shock-tube experiments and chemical kinetics modeling were performed to further understand the ignition and oxidation kinetics of lean methane-based fuel blends at gas turbine pressures. Ignition delay times were obtained behind reflected shock waves for fuel mixtures consisting of CH4, CH4/H2, CH4/C2H6, and CH4/C3H8 in ratios ranging from 90/10 to 60/40%. Lean fuel/air equivalence ratios (φ = 0.5) were utilized, and the test pressures ranged from 0.54 to 25.3 atm. A methane-oxidation kinetics mechanism based on GRI-Mech 3.0 was assembled to reproduce the methane/air mixtures. Additional reactions involving CH3O and CH3O2 chemistry and modifications to a few of the pressure-dependent reaction rate coefficients were needed to achieve good agreement between data and model.

scholarly journals MEMS Across the Valley of Death

2006 ◽  
Vol 128 (04) ◽  
pp. 26-30 ◽  
Author(s):  
Alan S. Brown
Keyword(s):  
Microelectromechanical Systems ◽  
Real Problem ◽  
Venture Capitalists ◽  
Jet Engines ◽  
Angular Rotation ◽  
Chip Size ◽  
Lean Fuel ◽  
Fuel Mixtures ◽  
The Right ◽  
Valley Of Death

This paper elaborates increasing use of microelectromechanical systems (MEMS) in aerospace industry. MEMS are chip-size devices usually carved from semiconductor wafers. Jet engines running lean fuel mixtures are prone to instability. High-temperature MEMS sensors could improve performance and fuel mileage while reducing emissions. The paper also discusses different MEMS structures, as MEMS structures vary greatly. The oscillating proofmass structures sense angular rotation around an axis in the gyro on the right. The industry has also begun to build a more innovation-ready infrastructure. The MEMS and Nanotechnology Exchange provides another way to ease the tortuous path to commercialization. It promises more prototypes, and more technologies will flow from MEMS inventors in the future. However, experts believe that the real problem is that until more MEMS companies begin making money in aerospace, venture capitalists hesitate to fund their companies.

Performance of Auto-Cyclic Reactor in Catalytic Combustion of Lean Fuel Mixtures

2005 ◽  
Vol 44 (25) ◽  
pp. 9676-9682 ◽  
Author(s):  
Danilo Klvana ◽  
Jamal Chaouki ◽  
Christophe Guy ◽  
Jitka Kirchnerova ◽  
Massimiliano Zanoletti
Keyword(s):  
Catalytic Combustion ◽  
Lean Fuel ◽  
Fuel Mixtures

Models of Thermodynamic Properties of Prominences

1979 ◽  
Vol 44 ◽  
pp. 349-355
Author(s):  
R.W. Milkey
Keyword(s):  
Thermodynamic Properties ◽  
Mass Transport ◽  
Emission Spectrum ◽  
Thermodynamic Parameters ◽  
Working Group ◽  
Physical Processes ◽  
Theoretical Concepts ◽  
Group 3 ◽  
Observational Techniques

The focus of discussion in Working Group 3 was on the Thermodynamic Properties as determined spectroscopically, including the observational techniques and the theoretical modeling of physical processes responsible for the emission spectrum. Recent advances in observational techniques and theoretical concepts make this discussion particularly timely. It is wise to remember that the determination of thermodynamic parameters is not an end in itself and that these are interesting chiefly for what they can tell us about the energetics and mass transport in prominences.

Effects of 5-5'-Diphenyl-2-thiohydantoin (DPTH) and Thyroxine on the Ultrastructure and Chemical Composition of Rat Liver

1971 ◽  
Vol 29 ◽  
pp. 570-571
Author(s):  
E. A. Elfont ◽  
R. B. Tobin ◽  
D. G. Colton ◽  
M. A. Mehlman
Keyword(s):  
Chemical Composition ◽  
Rat Liver ◽  
Future Study ◽  
Mode Of Action ◽  
Liver Mitochondria ◽  
Rat Liver Mitochondria ◽  
Effective Inhibitor ◽  
Biochemical Effects ◽  
Glycerophosphate Dehydrogenase ◽  
Stimulation Of

Summary5,-5'-diphenyl-2-thiohydantoin (DPTH) is an effective inhibitor of thyroxine (T4) stimulation of α-glycerophosphate dehydrogenase in rat liver mitochondria. Because this finding indicated a possible tool for future study of the mode of action of thyroxine, the ultrastructural and biochemical effects of DPTH and/or thyroxine on rat liver mere investigated.Rats were fed either standard or DPTH (0.06%) diet for 30 days before T4 (250 ug/kg/day) was injected. Injection of T4 occurred daily for 10 days prior to sacrifice. After removal of the liver and kidneys, part of the tissue was frozen at -50°C for later biocheailcal analyses, while the rest was prefixed in buffered 3.5X glutaraldehyde (390 mOs) and post-fixed in buffered 1Z OsO4 (376 mOs). Tissues were embedded in Araldlte 502 and the sections examined in a Zeiss EM 9S.Hepatocytes from hyperthyroid rats (Fig. 2) demonstrated enlarged and more numerous mitochondria than those of controls (Fig. 1). Glycogen was almost totally absent from the cytoplasm of the T4-treated rats.

Gap junctions in the prothoracic glands of the tobacco hornworm, Manduca sexta

1992 ◽  
Vol 50 (1) ◽  
pp. 706-707
Author(s):  
Ji-da Dai ◽  
M. Joseph Costello ◽  
Lawrence I. Gilbert
Keyword(s):  
Gap Junctions ◽  
Small Molecules ◽  
Manduca Sexta ◽  
Freeze Fracture ◽  
Cell Communication ◽  
Cellular Level ◽  
Thin Sections ◽  
Prothoracic Glands ◽  
Polyhydroxylated Steroids ◽  
Stimulation Of

Insect molting and metamorphosis are elicited by a class of polyhydroxylated steroids, ecdysteroids, that originate in the prothoracic glands (PGs). Prothoracicotropic hormone stimulation of steroidogenesis by the PGs at the cellular level involves both calcium and cAMP. Cell-to-cell communication mediated by gap junctions may play a key role in regulating signal transduction by controlling the transmission of small molecules and ions between adjacent cells. This is the first report of gap junctions in the PGs, the evidence obtained by means of SEM, thin sections and freeze-fracture replicas.

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