Study on Swirling Flow Characteristics of Single-Helix-Blade Biomass Gas Swirl Burner

doi:10.12068/j.issn.1005-3026.2025.20240036

Abstract

Abstract:

To study the effects of gas swirling flow on diffusion and mixing characteristics and its mechanism of influence on combustion performance in biomass gas swirl burners， a mathematical and physical model for the 3-dimensional gas flow and component transport was established in a single-helix-blade biomass swirl burner based on experimental investigations. Using Fluent 19.0 as the computational platform， a systematic study was conducted on the effects of the number of helical blade turns in the air duct， helical pitch， air channel cross-sectional area， and variable-diameter pipe length， on the gas swirling flow at the burner outlet. The results were compared with experimental findings. The results indicate that the numerical simulation results are consistent with the experimental test results. The number of helical blade turns has a minimal impact on the gas swirling flow， while the helical pitch has a decisive influence. When other conditions remain unchanged， the angular velocity of the outlet airflow increases gradually with the decrease in helical pitch； the angular velocity of the outlet airflow decreases gradually with the increase in air channel cross-sectional area. As the variable-diameter pipe gets shorter， the swirling intensity of the gas is stronger.

Key words: biomass gas, swirl burner, single-helix-blade, variable-diameter pipe

CLC Number:

TQ 522.15

Ming-jie FENG, Yu-qian XIA, Sheng-hui LIU, Jie LI. Study on Swirling Flow Characteristics of Single-Helix-Blade Biomass Gas Swirl Burner[J]. Journal of Northeastern University(Natural Science), 2025, 46(9): 51-57.

Figures/Tables 9

Fig.1 Schematic diagram of burner structure

Fig.2 Schematic diagram of experimental setup

Table 1 Main parameter values used in numerical simulation

Gas1流量 m₁/(kg·s^-1)	Gas2流量 m₂/(kg·s^-1)	螺旋节距 P/mm	叶片缠绕圈数 N	空气流道横截面积 A/m²	变径管长度 L/mm
0.038	0.016	40	2	0.061 3	22
		50	3	0.033 9	45
		60	4	0.023 4	62
		70	5	0.019 1	80

Fig.3 Grid division

Fig.4 Comparison of different grid simulating results

Fig.5 Comparison of numerical simulating and testing results

Fig.6 Angular velocity variation along radial direction at burner outlet with varying P when A=0.061 3 m2 and L=45 mm

Fig.7 Angular velocity variation along radial direction at burner outlet with varying A when P=60 mm and L=45 mm

Fig.8 Angular velocity variation along radial direction at burner outlet with varying L when P=60 mm and A=0.033 9 m2

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