Effect of strain rate on NOx emission in opposed impinging jet flame combustor

2002 ◽  
pp. 527-539
Author(s):  
S. Lim ◽  
Y. Yoon ◽  
C. Lee ◽  
I.-S. Jeung
Keyword(s):  
Strain Rate ◽  
Impinging Jet ◽  
Nox Emission ◽  
Jet Flame

526 Study on analysis of thermo-flow field in impinging jet flame during line heating

2001 ◽  
Vol 2001.14 (0) ◽  
pp. 585-586
Author(s):  
Junji SAWAMURA ◽  
Yasumitsu TOMITA ◽  
Naoki OSAWA ◽  
Kiyoshi HASHIMOTO
Keyword(s):  
Flow Field ◽  
Impinging Jet ◽  
Line Heating ◽  
Jet Flame

K-1925 Changes in NOx Emission Index during Development Process of Jet Flame after Injection

2001 ◽  
Vol II.01.1 (0) ◽  
pp. 483-484
Author(s):  
Tomomi KANEKO ◽  
Takemi CHIKAHISA ◽  
Yukio HISHINUMA
Keyword(s):  
Development Process ◽  
Nox Emission ◽  
Jet Flame ◽  
Emission Index

Direct Numerical Simulation of a Non-Premixed Impinging Jet Flame

2006 ◽  
Vol 129 (8) ◽  
pp. 951-957 ◽  
Author(s):  
Xi Jiang ◽  
Hua Zhao ◽  
Kai H. Luo
Keyword(s):  
Numerical Simulation ◽  
Direct Numerical Simulation ◽  
Impinging Jet ◽  
Jet Flame ◽  
Law Of The Wall ◽  
Wall Distance ◽  
Variable Density Flow ◽  
Nonisothermal Flows ◽  
The Law ◽  
Impinging Flame

A non-premixed impinging jet flame at a Reynolds number 2000 and a nozzle-to-plate distance of two jet diameters was investigated using direct numerical simulation (DNS). Fully three-dimensional simulations were performed employing high-order numerical methods and high-fidelity boundary conditions to solve governing equations for variable-density flow and finite-rate Arrhenius chemistry. Both the instantaneous and time-averaged flow and heat transfer characteristics of the impinging flame were examined. Detailed analysis of the near-wall layer was conducted. Because of the relaminarization effect of the wall, the wall boundary layer of the impinging jet is very thin, that is, in the regime of viscous sublayer. It was found that the law-of-the-wall relations for nonisothermal flows in the literature need to be revisited. A reduced wall distance incorporating the fluid dynamic viscosity was proposed to be used in the law-of-the-wall relations for nonisothermal flows, which showed improved prediction over the law of the wall with the reduced wall distance defined in terms of fluid kinematic viscosity in the literature. Effects of external perturbation on the dynamic behavior of the impinging flame were found to be insignificant.

scholarly journals Study on Combustion Analysis in the Impinging Jet Flame during Line Heating Process

2001 ◽  
Vol 2001 (190) ◽  
pp. 489-497
Author(s):  
Junji Sawamura ◽  
Yasumitsu Tomita ◽  
Naoki Osawa ◽  
Kiyoshi Hashimoto ◽  
Nobutaka Shinkai
Keyword(s):  
Impinging Jet ◽  
Heating Process ◽  
Combustion Analysis ◽  
Line Heating ◽  
Jet Flame

Numerical study on NO(x) reduction of impinging-jet-flame combustion in a closed vessel

1996 ◽  
Author(s):  
Jaeheon Kim ◽  
Soogab Lee ◽  
In-Seuck Jeung ◽  
Seong-Man Choi
Keyword(s):  
Numerical Study ◽  
Impinging Jet ◽  
Closed Vessel ◽  
Jet Flame ◽  
Flame Combustion

Effect of liftoff on NOx emission of turbulent jet flame in high-temperature coflowing air

1998 ◽  
Vol 27 (1) ◽  
pp. 1149-1155 ◽  
Author(s):  
Toshiro Fujimori ◽  
Dirk Riechelmann ◽  
Junichi Sato
Keyword(s):  
High Temperature ◽  
Turbulent Jet ◽  
Nox Emission ◽  
Jet Flame

Dislocation Substructures Produced During Tensile, Creep, and Fatigue Deformation of Ti3Al at 700°C

1977 ◽  
Vol 35 ◽  
pp. 272-273
Author(s):  
S. M. L. Sastry
Keyword(s):  
Intermetallic Compound ◽  
Strain Rate ◽  
Tensile Creep ◽  
Slip Systems ◽  
Slip Vector ◽  
Superlattice Structure ◽  
Slip Activity ◽  
Dislocation Arrangement ◽  
Ordered Intermetallic ◽  
Tangled Dislocation

Ti3Al is an ordered intermetallic compound having the DO19-type superlattice structure. The compound exhibits very limited ductility in tension below 700°C because of a pronounced planarity of slip and the absence of a sufficient number of independent slip systems. Significant differences in slip behavior in the compound as a result of differences in strain rate and mode of deformation are reported here.Figure 1 is a comparison of dislocation substructures in polycrystalline Ti3Al specimens deformed in tension, creep, and fatigue. Slip activity on both the basal and prism planes is observed for each mode of deformation. The dominant slip vector in unidirectional deformation is the a-type (b) = <1120>) (Fig. la). The dislocations are straight, occur for the most part in a screw orientation, and are arranged in planar bands. In contrast, the dislocation distribution in specimens crept at 700°C (Fig. lb) is characterized by a much reduced planarity of slip, a tangled dislocation arrangement instead of planar bands, and an increased incidence of nonbasal slip vectors.

Quantitative analysis of in situ straining experiments in the case of strong frictional forces

1978 ◽  
Vol 36 (1) ◽  
pp. 570-571
Author(s):  
F. Louchet ◽  
L.P. Kubin
Keyword(s):  
Strain Rate ◽  
Radiation Effects ◽  
Dislocation Line ◽  
Critical Length ◽  
Local Strain ◽  
Local Flow ◽  
Double Kink ◽  
Dislocation Densities ◽  
Frictional Forces ◽  
Local Strain Rate

Investigation of frictional forces -Experimental techniques and working conditions in the high voltage electron microscope have already been described (1). Care has been taken in order to minimize both surface and radiation effects under deformation conditions.Dislocation densities and velocities are measured on the records of the deformation. It can be noticed that mobile dislocation densities can be far below the total dislocation density in the operative system. The local strain-rate can be deduced from these measurements. The local flow stresses are deduced from the curvature radii of the dislocations when the local strain-rate reaches the values of ∿ 10-4 s-1.For a straight screw segment of length L moving by double-kink nucleation between two pinning points, the velocity is :where ΔG(τ) is the activation energy and lc the critical length for double-kink nucleation. The term L/lc takes into account the number of simultaneous attempts for double-kink nucleation on the dislocation line.

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