In this paper,using the computational fluid dynamics based on Euler Lagrange and the commercial software Barracuda VR,the gas-particle hydrodynamics and the erosion of particles on the inner wall and internal componen...In this paper,using the computational fluid dynamics based on Euler Lagrange and the commercial software Barracuda VR,the gas-particle hydrodynamics and the erosion of particles on the inner wall and internal components of the spouted bed in the integrated multi-jet swirling spout-fluidized bed(IMSSFB)are studied.Erosion experiments have obtained the characterization of particle erosion on internal components and verified the relevant numerical models.The results show that:the particle distribution within the IMSSFB is uneven due to the cyclonic effect of the axial swirl vane(ASV),resulting in particle erosion for the ASV being concentrated on one side;when the gas reaches the top,too high an erosion gas velocity leads to gas backflow.As the filling height increases,there is a tendency for the erosion position of the particles on the ASV to expand upwards.However,the effect of increasing gas velocity on the erosion position is insignificant.展开更多
The micromix combustor is capable of shortening flame lengths and achieving very low emissions under lean fuel conditions,and mostly uses multi-jet burner.Lacking the traditional swirl flame stabilization mechanism,th...The micromix combustor is capable of shortening flame lengths and achieving very low emissions under lean fuel conditions,and mostly uses multi-jet burner.Lacking the traditional swirl flame stabilization mechanism,the limited stability range of multi-jet burner restricts its application in gas turbine combustor,especially for methane fuel.This study presents the development and experimental analysis of a multi-jet burner with pilot flames,using both premixed and non-premixed pilot flames.The design aims to improve lean blowout limit,a critical factor for expanding the operational range and low-load capability.Experiments at atmospheric pressure,along with large eddy simulations,are conducted to illustrate the stabilizing mechanisms and establish pilot flame design criteria.The findings reveal that the stability of the multi-jet burner is primarily depended on the stability of single-nozzle flame.An optimized pilot flame is crucial for the single-nozzle.The premixed pilot flame requires the pilot nozzle diameter to be less than 0.6 mm to provide sufficient heat and radicals to stabilize the main flame,ensuring that the burner stability is improved by 35 K.The non-premixed pilot flames demonstrate a greater potential for stability enhancement,particularly as the pilot fuel ratio increases.In addition,when the pilot fuel ratio is less than 15%,the non-premixed pilot flame has certain NO_(x) emission advantages,achieving a wide range of 252 K for burner stability without causing emission problems.These results provide an innovative perspective on enhancing stability in gas turbine combustors by designing pilot flames on the single-nozzle.展开更多
基金supported by the National Natural Science Foundation of China(22178286)Shaanxi Qin Chuangyuan“scientist and engineer”team construction project(2022KXJ-041)。
文摘In this paper,using the computational fluid dynamics based on Euler Lagrange and the commercial software Barracuda VR,the gas-particle hydrodynamics and the erosion of particles on the inner wall and internal components of the spouted bed in the integrated multi-jet swirling spout-fluidized bed(IMSSFB)are studied.Erosion experiments have obtained the characterization of particle erosion on internal components and verified the relevant numerical models.The results show that:the particle distribution within the IMSSFB is uneven due to the cyclonic effect of the axial swirl vane(ASV),resulting in particle erosion for the ASV being concentrated on one side;when the gas reaches the top,too high an erosion gas velocity leads to gas backflow.As the filling height increases,there is a tendency for the erosion position of the particles on the ASV to expand upwards.However,the effect of increasing gas velocity on the erosion position is insignificant.
基金the support provided by National Science and Technology Major Project of China(No.2019-Ⅲ-00180062)。
文摘The micromix combustor is capable of shortening flame lengths and achieving very low emissions under lean fuel conditions,and mostly uses multi-jet burner.Lacking the traditional swirl flame stabilization mechanism,the limited stability range of multi-jet burner restricts its application in gas turbine combustor,especially for methane fuel.This study presents the development and experimental analysis of a multi-jet burner with pilot flames,using both premixed and non-premixed pilot flames.The design aims to improve lean blowout limit,a critical factor for expanding the operational range and low-load capability.Experiments at atmospheric pressure,along with large eddy simulations,are conducted to illustrate the stabilizing mechanisms and establish pilot flame design criteria.The findings reveal that the stability of the multi-jet burner is primarily depended on the stability of single-nozzle flame.An optimized pilot flame is crucial for the single-nozzle.The premixed pilot flame requires the pilot nozzle diameter to be less than 0.6 mm to provide sufficient heat and radicals to stabilize the main flame,ensuring that the burner stability is improved by 35 K.The non-premixed pilot flames demonstrate a greater potential for stability enhancement,particularly as the pilot fuel ratio increases.In addition,when the pilot fuel ratio is less than 15%,the non-premixed pilot flame has certain NO_(x) emission advantages,achieving a wide range of 252 K for burner stability without causing emission problems.These results provide an innovative perspective on enhancing stability in gas turbine combustors by designing pilot flames on the single-nozzle.
