Experimental investigations on flow field and combustion characteristics of a model trapped vortex combustor

Jin, Yi; Li, Yefang; He, Xiaomin; Zhang, Jingyu; Jiang, Bo; Wu, Zhongming; Song, Yaoyu

doi:10.1016/j.apenergy.2014.08.029

Cited by 40 publications

(7 citation statements)

References 22 publications

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“…PIV is a noncontact measurement technique which offers full-field measurements without significant flow-field interference. Many researchers have studied combustor flow fields using PIV [15][16][17][18][19][20]. For example, the swirling flow inside a rectangular-shaped chamber was studied in [19].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Flow Characteristics of a Reverse-Flow Combustor

et al. 2022

International Journal of Aerospace Engineering

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Reverse-flow combustor is widely used for small engines to overcome high speed shaft whirling problem and to provide a low frontal area. An experimental investigation was carried out to research the flow field characteristics of a reverse-flow combustor in this paper. Different aerodynamic conditions were studied using PIV to reveal the characteristics of both the nonreacting and reacting flow fields. The structure of the nonreacting flow field in the central section shows similarity as the total pressure loss coefficient increases. The penetrating depth, jet angle, recirculation zone position, and the flow streamlines are similar, while the velocity value of the flow field increases. The structure of the reacting flow field on the central section is different from that of nonreacting flow field, but the variation trend of the reacting flow field under different pressure loss coefficient is similar to that of the nonreacting flow field. By examining the nonreacting and reacting flow fields under the same total pressure loss conditions, marked differences were observed in the primary zone close to the swirler outlet. The relative motion between fuel injection, airflow, and combustion affects the flow field in this zone. The velocity with combustion is faster than that of the nonreacting flow because of the increased temperature and heat release.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Flow Characteristics of a Reverse-Flow Combustor

et al. 2022

International Journal of Aerospace Engineering

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“…The combustion characteristics may be mainly attributed to the significant differences in the flow patterns. Jin et al (2014a); Jin et al (2014b); Jin et al (2014c) focus on the effects of the cavity-injector/radial-strut relative positions on the TVC performance. These specific positions include inline, intermediate and staggered arrangement.…”

Section: Introductionmentioning

confidence: 99%

Effect of Mainstream Swirling on Flowfield Characteristics of an Outer-Cavity Trapped Vortex Combustor

2021

JAFM

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Nonreacting flow characteristics are important for determining the performances of combustors. In the present work, the effects of mainstream swirling on the nonreacting flow characteristics of an outer-cavity trapped vortex combustor are investigated by introducing swirlers. The results are first validated by particle image velocimetry measurements by considering four swirl numbers (0, 0.4, 0.6, and 0.8) and three velocity sets. The results show that the addition of swirlers in the mainstream introduces 3D flow not only in the mainstream but also in the cavities. As the swirl number increases, the size of the low-velocity region near the center-line of the combustor increases both in the axial and radial directions. The cavity flow maintains the dual-vortex pattern for most cases; however, for certain cases with high mainstream velocities and high swirl numbers (0.6, 0.8), multiple-vortex patterns are observed. The mixing results are discussed in terms of turbulence intensity and kinetic energy. The turbulence intensities of the combustor outlet for a swirl number of 0.8 are found to increase by approximately 250-350% compared to the case without swirling, indicating dramatically enhanced mixing.

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“…Three design criteria are of crucial importance in the microturbine combustor technologies. First, the trapped vortex formed by recirculation of the combustion product should be reinforced using suitable fuel and air injection [40] to widen the stable combustion range [41]. Second, superior sustainable combustion performance should be attained by preheating combustion by-products via recirculation materials.…”

Section: Introductionmentioning

confidence: 99%

Design, manufacture and test of a micro-turbine renewable energy combustor

Bazooyar

Darabkhani

2020

Energy Conversion and Management

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The ever-increasing demand on highly efficient decentralized power generation with low CO2 emission has made microturbines for power generation in micro-combined heat and power (mCHP) generation systems popular when running on biofuels as a renewable source of energy. This document presents a state-of-the-art design, and optimization (in terms of design, performance and emission control) of a micro-turbine renewable energy combustor that fits into the existing Bladon 12kWe recuperated microturbine plenum while running on a range of biofuels as it can successfully provide the required power of the mCHP. Governing equations for in-depth analysis of the combustor consist of manufacturer empirical data to simulate system-level operation with respect to replacement of the fossil with biofuels. The Model developed and validated at company's ISO conditions confirms the output power of the new combustor fits the conventional system with slight eco-energy improvements. The modeling of the combustor in a complete microturbine assembly system is performed, then was utilized to further analysis of the microturbine with the designed combustor. The experimental results gave on average 46.7% electrical efficiency, 83.2% system efficiency, 12 kWe electrical power, and 90% recuperator effectiveness at nominal operating conditions of microturbine (MT). Sensitivity analyses evaluate changes in performance with respect to fuel phase (e.g., liquid or gaseous) and design variables (e.g., orientation, shape, and dimensions of combustor), leading to energy optimization of the unit.Experimental findings demonstrate that the combustor in microturbine can meet the target performance specifications of a company conventional diesel microturbine with significant savings. An objective function including both combustor and recuperator technical energy data is defined for finding the best ratio of fuel and air and their flow rates to find the most effective operating points for the operation of MT. Annual time series simulations completed for Coventry, West Midlands, United Kingdom indicate a new combustor can reduce operational costs of diesel 3 fuel combustor by 8%, 2%, 36%, and 25% when supplying bioethanol, DME, biogas, and NG, respectively. Annual operating time of the renewable microturbine combustor at rated capacity included an 11% reduction in exergy loss with biogas fuel relative to diesel fuel.

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Experimental investigations on flow field and combustion characteristics of a model trapped vortex combustor

Cited by 40 publications

References 22 publications

Experimental Investigation on Flow Characteristics of a Reverse-Flow Combustor

Experimental Investigation on Flow Characteristics of a Reverse-Flow Combustor

Effect of Mainstream Swirling on Flowfield Characteristics of an Outer-Cavity Trapped Vortex Combustor

Design, manufacture and test of a micro-turbine renewable energy combustor

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