Experimental investigation of distance between v-gutters on flame stabilization and NOx emissions

Abstract

Blow-off performance and NO x emissions of the propane and air mixture in a rectangular combustion chamber with bluff bodies were investigated experimentally and numerically. The effects of distance between bluff bodies on NO x emissions, the blow-off limit, and exhaust gas temperature were examined. It was observed that NO x emissions are highly dependent on distance between V-gutters. The re-circulation zone behind the bluff body expands in width based on the decrease of distance between V-gutters, and expands in length with the increase of inlet velocity. The temperature fields behind the bluff body show a similar change, the temperature behind the bluff body reaches its highest when the distance between V-gutters reaches 20 mm, meaning it has better flame stability. The blow-off limit is significantly improved with the decrease of distance between V-gutters. The blow-off limit is greatly improved by reducing the distance between the V-gutters. Maximum blow-off limit of 0.

Effects of different fuel supply types on combustion characteristics behind group of V-gutter flame holders: Experimental and numerical study

“…Simulations performed in [15] with a triangular-shaped bluff body (with slits on both sides) and based on experimental data obtained [8] indicate that the increasing in the angle at the corner vertex leads to increased flame stabilization. Similar results have been reported in [16,17].…”

“…The main scientific and technical challenges address the increases in the operating efficiencies of the gas turbine bases combustion devices inasmuch as decreasing the harmful emissions is a principle task in the new century. Considering technical and economic perspectives it is acceptable to use bluff bodies or their combinations [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. In this context, a considerable advantage of burners based on bluff bodies is that they can operate with various kinds of --------------fuels in a broad range of densities and viscosities such as heavy petroleum-based gases or light natural gases or various gas mixtures with hydrogen [6].…”

“…The results presented in this articles are motivated by the broad spectrum of results developed in previous experimental reports [16,17,[27][28][29][30]. Precisely, the study focuses on a grid consisting of a group of corner flame holders of the same type and its effect on the combustion process performance.…”

Numerical study of the injection conditions effect on the behavior of hydrogen-air diffusion flame

“…The present work mainly concerns the numerical simulation of the phenomenon of turbulent combustion, in a non-premixed flame of the H2-Air type. The aim is to produce a numerical investigation of non-polluting combustion and giving rise to very high temperatures (of the order of 2000 K) [17]. The studied configuration is composed of two coaxial axis-symmetric jets, such as can be found in diffusion burners.…”

Metallic plate heating by a flat burner: Experiments and CFD simulations

“…An analysis of the main reasons for the formation of nitrogen oxides in various devices and the prospects for the development of the power industry showed that traditional methods of fuel combustion do not provide the required parameters. Improving the efficiency of fuel combustion can be obtained by using microflame combustion [1][2][3].…”