PIV measurement and turbulence scale in turbulent combustion

Abstract

We have investigated turbulent combustion by PIV (Particle Image Velocimetry) technique. Comparing with LDV data, the validity of PIV measurements has been confirmed. Particularly, the conditions of sampling number and spatial resolution have been shown to yield reliable data using PIV. Based on the velocity fields in cold flow and combustion, the interaction between flame and flow has been discussed. It was observed that the flow field is changed by combustion and the turbulence is reduced. In order to determine statistical quantities such as mean velocity and RMS of velocity fluctuation, a sampling number of 1000 is needed. Moreover, the velocity correlation coefficient was evaluated to obtain the integral length scale of the flow. For both cold flow and combustion, the PIV estimated scale is very close to that of LDV based on the assumption of Taylor's hypothesis. As a result, the spatial resolution in this study is about 6 times smaller than the integral length scale.

Flow Field of Turbulent Premixed Combustion in a Cyclone-Jet Combustor

“…It consists of a combustion chamber with a main jet nozzle and four cyclone nozzles for pilot flames. (19) . Some errors may appear when more seeding particles pass through the laser sheet in large swirl flow.…”

Past and current components-based detailing of particle image velocimetry: A comprehensive review

“…Brandt and Merzkirch [ 28 ] investigated spray jet and water particles with 100–400 μm. Yamamoto et al [ 63 ] utilized MgO as particle scatters. Güler et al [ 69 ] investigated three different drift retardants in wind tunnel.…”

“…Yamamoto et al [ 63 ] carried out a study on turbulent combustion. In the study, PIV and LDV are used utilized, respectively.…”

Local flame structure and turbulent burning velocity by joint PLIF imaging

“…The fuel is propane. In our previous measurements by LDV and PIV, the turbulent Reynolds number, Re T , is from 96 to 448 for U m = 5 to 30 m/s, / m = 0.75 and 0.9 [20,21]. On the phase diagram, the condition of U m < 15 m/s for / m = 0.75 or U m < 20 m/s for / m = 0.90 belongs to the flamelet regime, and that of U m > 20 m/s for / m = 0.75 or U m = 30 m/s for / m = 0.90 belongs to the thin-reaction-zones regime.…”

“…The other is the orthogonal OH-PLIF measurement to obtain the 2D images in both the vertical and horizontal planes, which is quite a new trial for further discussion on 3D flame structure. The turbulent premixed flames are formed by a cyclone-jet combustor in a wide range of turbulence [20][21][22]. It should be noted that the flame characteristics including local burning velocity could be examined based on peak OH concentration in turbulent flames [23].…”