Study of Prediction Methods for NOx Emission from Turbofan Engines

Chandrasekaran, N.; Guha, Ayan

doi:10.2514/1.b34245

Cited by 44 publications

(18 citation statements)

References 13 publications

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“…It also can be observed that CO and EICO increased with the increment in ṁF/ṁpri ratio at a given P, which is explained by the escalating CO formation through Equation (8) as more CH4 participated It also can be observed that CO and EICO increased with the increment inṁ F /ṁ pri ratio at a given P, which is explained by the escalating CO formation through Equation (8) as more CH 4 participated in the combustion. Fitting the data in Figure 17 with the power function y = Cx 1 a x 2 b , the correlations for the influences of P andṁ F /ṁ pri ratio on CO and EICO are described by Equations (24) and (25):…”

Section: Co Emissionmentioning

confidence: 99%

“…0.75 (25) The prediction of CO with the correlation in Equation (24) was compared to the measurement as shown in Figure 18a. Good accordance is found between measured and the calculated results.…”

Section: Co Emissionmentioning

confidence: 99%

“…Among various impacts, the influence of combustion pressure P on NO and CO formation is of particular significance, because of the continuing trend toward engines with higher pressure ratios (relative to the atmosphere) for achieving higher thermal efficiency and lower fuel consumption [4]. Pressure ratios of heavy-duty gas turbines (F/G/H level) have been increased to about 15~40-fold, such as GE 7HA/9HA (22), Siemens SGT6-6000G/SGT5-8000H (19), Mitsubishi M501G/M701G (20) and M501H (25), ALSTOM GT26 (33).…”

Section: Introductionmentioning

confidence: 99%

“…They serve in designing and developing low-emission combustors by reducing the complicated problems affiliated with emissions to forms which are more easier for the combustion engineers. These models can be found in the reviews by Tsalavoutas et al [24], Chandrasekaran and Guha [25], as listed in Table A1 in Appendix A. For example, a general correlation proposed by Lefebvre [26] is showed by Equation 4:…”

Section: Introductionmentioning

confidence: 99%

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An Experimental Investigation on the NO and CO Emission Characteristics of a Swirl Convergent-Divergent Nozzle at Elevated Pressure

et al. 2018

Energies

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The behavior of the pollutants NO and CO at elevated combustor pressure are of special importance due to the continuing trend toward developing engines operating at higher pressure ratios to yield higher thermal efficiency. An experiment was performed to examine the NO and CO emissions for a swirl convergent-divergent nozzle at elevated pressure. The NO and CO correlations were obtained. Meanwhile, the flame length, exhaust gas oxygen concentration, exit temperature and global flame residence time were also determined to analyze the NO and CO emission characteristics. The results showed that, with the increase in combustor pressure P, flame length decreased proportionally to P −0.49 ; exit O 2 volume fraction increased and exit temperature was reduced. The global flame residence time decreased proportionally to P −0.43. As pressure increased, the NO and Emission Index of NO (EINO) levels decreased proportionally to P −0.53 and P −0.6 respectively, which is mainly attributed to the influence of global flame residence time; the NO and EINO increased almost proportionally with the increase in global flame residence time. The EINO scaling EINO (ρu e /d) was proportional to Fr 0.42 , which indicated that compared with pure fuel, the fuel diluted with primary air can cause a decrease in the exponent of the Fr power function. At higher pressure, the CO and Emission Index of CO (EICO) decreased proportionally to P −0.35 and P −0.4 , respectively, due to the increased unburned methane and high pressure which accelerated chemical reaction kinetics to promote the conversion of CO to CO 2 .

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Section: Co Emissionmentioning

confidence: 99%

Section: Co Emissionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

An Experimental Investigation on the NO and CO Emission Characteristics of a Swirl Convergent-Divergent Nozzle at Elevated Pressure

et al. 2018

Energies

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“…Among the three flight conditions, cruise phase has the largest differences as the ICOA databank covers only up to 3,000 ft altitude (Chandrasekaran and Guha, 2012). A list of emissions emitted and its differences with respect to kerosene fuel is tabulated in Table 2 for comparison.…”

Section: Emission Analysismentioning

confidence: 99%

Comparison of aircraft engine performance and emission analysis using alternative fuels

Azami

Savill

2017

IJSA

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Abstract:Following the successful flights of many commercial aircraft running with alternative fuels, the present study focuses on aircraft engine performance and emission analysis. The analysis of aircraft engine performance (thrust, fuel flow and specific fuel consumption) for different blended mixing ratio percentages of biofuels (Camelina and Jatropha) with Jet-A, at different flight conditions using in-house computer software codes, PYTHIA and TURBOMATCH. Emission analysis utilised HEPHAESTUS in-house software to predict nitrous oxides and carbon monoxide emission at various flight conditions. A model three-shaft high-bypass-ratio engine, similar to the RB211-524, was used. Blended fuels exhibited a slight improvement in engine performance at higher mixing ratio percentages; with Jatropha biofuel surpassing Camelina biofuel in terms of all considered performance indexes. Nitrous oxides can be reduced using pure Jatropha biofuel as compared to kerosene fuel for every flight condition. However, for carbon monoxide emission strongly depends on the combustor inlet conditions and flight phases.

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Emissions from FEHA Fueled RQL Gas Turbine Combustor Under High-Pressure and High-Temperature Simulated in-Flight Conditions

Fujiwara

Okai

2021

Green Energy and Technology

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Study of Prediction Methods for NOx Emission from Turbofan Engines

Cited by 44 publications

References 13 publications

An Experimental Investigation on the NO and CO Emission Characteristics of a Swirl Convergent-Divergent Nozzle at Elevated Pressure

An Experimental Investigation on the NO and CO Emission Characteristics of a Swirl Convergent-Divergent Nozzle at Elevated Pressure

Comparison of aircraft engine performance and emission analysis using alternative fuels

Emissions from FEHA Fueled RQL Gas Turbine Combustor Under High-Pressure and High-Temperature Simulated in-Flight Conditions

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