NOx and CO emissions from gas turbines are limited by European legislation to 25 ppmvd for natural operations. To meet this objective, that of future legislation, it is necessary develop a numerical tool can predict quickly accurately. In study, chemical reactor network (CRN) developed based on computational fluid dynamics (CFD). A combustor modeled using Star-CCM+, commercial CFD code. The consists 22 elements, which act as different reaction zones in the combustor. predictions exhaust work...

This article is on heat transfer analysis by the commercial code, FLUENT, for slabs heated in a walkingbeam type of re-heating furnace POSCO (Pohang Iron & Steel Co., Ltd.). Steady state, three-dimensional performed turbulent reactive flow and radiative furnace. Computation based Favre-averaged conservation equations mass, momentum, energy species with k–ε turbulence model. The predicted global good agreement measurement. Two-dimensional transient calculation conduction slab boundary...

This paper reports the test results of a diesel engine at different speeds, injection timings and emulsion ratios with water-emulsified fuel. Results show that both NO x smoke may be reduced significantly same brake specific fuel consumption (b.s.f.c.) high speeds above 1400 r/min. At low below 1000 r/min slightly minor penalty in b.s.f.c. no overall gain use In tested range water-oil ratio by volume 0-40 there was significant deterioration HC CO emissions combustion stability terms cyclic...

An atomization model for plain-orifice diesel fuel sprays is developed. It considers both turbulent fluctuation in the jet flow and wave growth by gas inertia force due to velocity. The developed implemented as a module into KIVA code terms of primary secondary drop parcels. computation results are good agreement with experimental data size distribution well spray tip penetration shape.

The combustion characteristics of emulsified diesel fuels are investigated in a rapid compression and expansion machine (RCEM). Among the test cases, 40 water-oil (W/O) fuel injected at 20° before top dead center (BTDC) has shown best performance with respect to efficiency NO x soot emissions. pressure trace W/O is characterized by longer ignition delay lower rate rise premixed combustion. High-speed photographs show reduced flame luminosity temperature increasing ratio. Microexplosions...

The cellular breakup phenomenon is investigated experimentally for a planar liquid sheet from an air-blast nozzle. dominant sinuous wave growing spatially downstream forms complicated structures of perforated thin films and surrounding ligaments. Several characteristic parameters are measured photographic images compared with linear temporal analysis. wavelength proportional to the inverse square relative velocity between air liquid. estimated time matches growth most unstable wave, while...

We present simple effective micromixer designs utilizing electrokinetic instability (EKI) with downstream cavity structures in a micro-T channel. The amount of free charge increases at each corner the cavities where inhomogeneous flow stream meets electric field curved along concentration gradient. resulting Coulombic force enhances and leads to repetitive evolutionary pattern from one next, yielding higher mixing efficiency. efficiency is found increase by about 15% for channel...