Predictive Numerical Analysis on the Mixing Characteristics in a Rotating Detonation Engine (RDE)

Rahman, Mohammad Nurizat; Wahid, Mazlan Abdul; Yasin, Mohd Fairus Mohd; Abidin, Ummikalsom; Mazlan, Muhammad Amri

doi:10.5109/4372268

Cited by 4 publications

(3 citation statements)

References 24 publications

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“…The size, stability, and level of combustion intensity of the flame are affected by the swirl in the reacting flow while for non-reactive flow, the swirl affects jet development, entrainment and decay. These effects are greatly influenced by how much swirl is added to the flow 32,33) . Swirl is commonly expressed as the ratio of axial flux of tangential momentum to the product of the nozzle radius and axial flux of axial momentum.…”

Section: Effect Of Swirlingmentioning

confidence: 99%

A Review on the Combustion Characteristics of an Asymmetric Swirling Combustor in Flameless Mode

Najib Aminu Ismail,

Mazlan Abdul Wahid,

Sa’at

et al. 2023

Evergreen

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As the population of the world is growing rapidly, the demand for energy that is clean and efficient is increasing. Combustion is one of the major ways of energy conversion that produces very high amount of pollutant emission, as such the research arena has been taken over by coming up with combustion processes that are cleaner and efficient by the combustion engineers. Flameless combustion is one of the new techniques discovered by researchers to suppress NOx emission due to the low temperature inside the combustion zone that is well below the dissociation temperature of Nitrogen. Homogenous or proper mixing is another major factor that enhances combustion efficiency. An asymmetric swirling combustor is a unique shaped combustor that was developed by researchers in order to enhance better mixing inside the combustion zone without the need for an external swirler. The review investigated several parameters such as temperature uniformity, fuel flexibility and level of pollutant emission as discussed by researchers and it was found that the asymmetric swirling combustor is very efficient with temperature uniformity of about 0.9, thermal efficiency of 53% and very low NOx and CO of about 2ppm and 24ppm according to researchers. It was recommended that the combustor should be investigated under different flow configurations i.e. forward and reverse flow in order to know the optimum direction of flow for the asymmetric swirling combustor.

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Section: Effect Of Swirlingmentioning

confidence: 99%

A Review on the Combustion Characteristics of an Asymmetric Swirling Combustor in Flameless Mode

Najib Aminu Ismail,

Mazlan Abdul Wahid,

Sa’at

et al. 2023

Evergreen

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“…As a result, it can help with combustion tuning for actual H 2 -NG co-firing in power plants. CFD has been used extensively to investigate flow dynamics, heat transmission, and combustion qualities [17][18][19][20][21]. As a result, a detailed Large Eddy Simulation (LES) was used in this study to investigate the effects of H 2 -NG co-firing on CRZs, combustion properties, and CIVB flashback risks in a pilot-scale swirl burner facility.…”

Section: Introductionmentioning

confidence: 99%

Large Eddy Simulation of Hydrogen/Natural Gas/Air Premixed Swirling Flames and CIVB Flashback Risks

Mohammad Nurizat Rahman,

Suzana Yusup

2023

CFDL

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The desire to develop gas turbines (GTs) that can utilise natural gas (NG) blended with hydrogen (H2) often encounters operability challenges related to combustion-induced vortex breakdown (CIVB) flashback issues. Hence, a detailed Large Eddy Simulation (LES) was employed in this study to examine the impact of H2-NG co-firing on central recirculation zones (CRZs), combustion properties, and the risk of CIVB flashback in a pilot-scale swirl burner facility. The LES model successfully replicated the swirling component of the flame observed in the experiment with reasonable accuracy. The findings revealed that the introduction of H2 into the burner increased the velocity and temperature of the burned gases. The higher reactivity of H2 resulted in faster burning rates and a shift in the reaction zone, indicating that NG-H2 firing burns more rapidly than pure NG firing. Additionally, H2 was found to enhance the velocity gradient, pushing the CRZ upstream. Changes in the location of the CRZ can disrupt density and velocity gradients, affecting the generation of vorticity by the baroclinic torque and potentially increasing negative axial velocity, thereby increasing the risk of CIVB flashback. Further research is necessary to comprehensively assess the CIVB flashback risk, particularly when the proportion of H2 exceeds 30 %.

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“…Another approach that has the potential to be a dependable and cost-effective strategy in the investigation of OPWs co-firing is numerical modelling (computational fluid dynamics). Numerical modelling has been shown to be an effective technique for diagnosing and resolving flow and combustion issues [24,[26][27][28][29][30][31]. As it can provide insights into the combustion properties of unfamiliar solid fuel blends [6,24], such as OPWs co-firing, it has been widely used to examine the combustion performance of a single coal and multiple solid fuel blends in bench-pilots and full-scale utility furnaces.…”

Section: Introductionmentioning

confidence: 99%

Oil Palm Wastes Co-firing in an Opposed Firing 500 MW Utility Boiler: A Numerical Analysis

Rahman

Yusup

Chin

et al. 2023

CFDL

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Malaysia is rich in palm oil plantations, where oil palm wastes (OPWs) are one of the readily accessible biomass resources. OPWs has the potential to be used as a fuel for electricity generation. Hence, the evaluation of OPWs co-firing for one of Malaysia's 500 MW utility boilers was executed numerically. Three types of OPWs were tested including empty fruit bunches (EFB), palm kernel shell (PKS), and palm mesocarp fibres (PMF). The predicted furnace exit gas temperature (FEGT) from the numerical model was validated against the actual FEGT from the power plant where the current boiler is situated, revealing a difference of less than 10%. The nose area temperature was predicted to exceed the cap of 1200°C in OPWs co-firing cases due to higher volatile matter (VM) in OPWs than the baseline of pure coal case, leading to higher levels of volatile release. When co-firing with OPWs, the predicted unburned carbon (UBC) at the boiler's outlet is lower because OPWs-coal blends contain less fixed carbon (FC) than the pure coal blend. UBC levels were anticipated to be lower than the loss of ignition (LOI) limit in all cases, highlighting its positive impact on carbon reduction. Slightly lowered mill performance was observed as a result of the calculated OPWs fuel flow surpassing the normal operation in the power plant to make up for the low gross calorific value (GCV) of OPWs while meeting the required load from the boiler. OPWs co-firing was predicted to emit lower carbon monoxide (CO) and carbon dioxide (CO2) than baseline coal due to lower FC. Nonetheless, higher thermal nitrogen oxides (NOx) were predicted due to the higher flame temperature created by OPWs co-firing. Even so, it is recommended that the ash mineral composition be included in future numerical studies since the ash minerals may have an effect on the emitted NOx.

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Predictive Numerical Analysis on the Mixing Characteristics in a Rotating Detonation Engine (RDE)

Cited by 4 publications

References 24 publications

A Review on the Combustion Characteristics of an Asymmetric Swirling Combustor in Flameless Mode

A Review on the Combustion Characteristics of an Asymmetric Swirling Combustor in Flameless Mode

Large Eddy Simulation of Hydrogen/Natural Gas/Air Premixed Swirling Flames and CIVB Flashback Risks

Oil Palm Wastes Co-firing in an Opposed Firing 500 MW Utility Boiler: A Numerical Analysis

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