Correlation of lean blowoff in an annular combustor

Mellor, A. M.; Jarymowycz, T. A.

doi:10.2514/3.22866

Cited by 22 publications

(6 citation statements)

References 6 publications

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“…The lean and rich limits of fuel under different T 3 can be estimated by Eqs. (9) and (10) (proposed by Zabetakis [40]) or obtained from National Institute of Standards and Technology-JANNAF thermochemical tables: For lean:…”

Section: Characteristic Curve Of Flame Volumementioning

confidence: 99%

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Predicting Lean Blowout Limit of Combustors Based on Semi-Empirical Correlation and Simulation

Zhao

2016

Journal of Propulsion and Power

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A method named characteristic curve of flame volume is achieved for lean blowout predictions on the basis of the improved Lefebvre's model and simulated reacting flows. Three main issues are presented: 1) Based on the results from combustion visualization experiments, Lefebvre's model is improved regarding its universality for combustor configurations. The flame volume near lean blowout V flame;LBO obtained from simulated reacting flow is introduced into the model. 2) Characteristic curve of flame volume is a functional curve of flame volume V flame and fuel/air ratio q in a certain combustor and is presented as an "S" pattern, with q ranging from stable operation to nearly engine-off conditions. The region where the fuel/air ratio ranges from 3 to 10 in characteristic curve of flame volume is the unstable combustion region, and nearly all of the lean blowout points fall in this region. 3) According to the relationship between characteristic curve of flame volume expressed as q fV flame and the improved Lefebvre's model expressed as q LBO f m V flame;LBO , a method named characteristic curve of flame volume is proposed for lean blowout predictions. By the comparison with experimental data on 26 combustors, the lean blowout fuel/air ratios obtained by the characteristic curve of flame volume method fit well with that obtained by experiments, having maximum and average errors of 24.2 and 7.0% between predictions and measurements.

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Section: Characteristic Curve Of Flame Volumementioning

confidence: 99%

“…They were all originated from early studies on the stabilization of bluff-body flames. In the 1970s, PSR and CT models were introduced into the LBO predictions of primary combustors by various authors [5][6][7][8][9][10][11]. In PSR models, LBO occurs when the heat release rate in PSR models is less than heat loss rate.…”

Section: Introductionmentioning

confidence: 99%

Predicting Lean Blowout Limit of Combustors Based on Semi-Empirical Correlation and Simulation

Zhao

2016

Journal of Propulsion and Power

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Section: Introductionmentioning

confidence: 99%

“…The LBO prediction on gas turbine combustor based on correlation has been suggested by many researchers (Jarymowycz and Mellor, 1986;Xie et al, 2012;Huelskamp et al, 2015;Hu et al, 2015;Lei et al, 2021). Jarymowycz and Mellor (1986) developed a correlation to predict LBO in an annular combustor. The combustor geometry, inlet flow conditions and fuel injector properties from three different engines were taken as a model parameter for their study.…”

Section: Introductionmentioning

confidence: 99%

Prediction of lean blowout performance on variation of combustor inlet area ratio for micro gas turbine combustor

Kirubakaran

Shankar

2021

AEAT

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Purpose This paper aims to predict the effect of combustor inlet area ratio (CIAR) on the lean blowout limit (LBO) of a swirl stabilized can-type micro gas turbine combustor having a thermal capacity of 3 kW. Design/methodology/approach The blowout limits of the combustor were predicted predominantly from numerical simulations by using the average exit gas temperature (AEGT) method. In this method, the blowout limit is determined from characteristics of the average exit gas temperature of the combustion products for varying equivalence. The CIAR value considered in this study ranges from 0.2 to 0.4 and combustor inlet velocities range from 1.70 to 6.80 m/s. Findings The LBO equivalence ratio decreases gradually with an increase in inlet velocity. On the other hand, the LBO equivalence ratio decreases significantly especially at low inlet velocities with a decrease in CIAR. These results were backed by experimental results for a case of CIAR equal to 0.2. Practical implications Gas turbine combustors are vulnerable to operate on lean equivalence ratios at cruise flight to avoid high thermal stresses. A flame blowout is the main issue faced in lean operations. Based on literature and studies, the combustor lean blowout performance significantly depends on the primary zone mass flow rate. By incorporating variable area snout in the combustor will alter the primary zone mass flow rates by which the combustor will experience extended lean blowout limit characteristics. Originality/value This is a first effort to predict the lean blowout performance on the variation of combustor inlet area ratio on gas turbine combustor. This would help to extend the flame stability region for the gas turbine combustor.

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“…A considerable number of researchers predicted the LBO limits on actual and model gas turbine combustor through empirical relations, numerical and experimental predictions. Jarymowycz and Mellor (1986) developed a correlation to predict LBO in an annular combustor. The combustor geometry, inlet conditions, and fuel injector properties are taken as a model parameter.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical prediction of lean blowout limits for micro gas turbine combustor

Kirubakaran

Bhatt

2021

AEAT

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Purpose The lean blowout (LBO) limit of the combustor is one of the important performance parameters for any gas turbine combustor design. This study aims to predict the LBO limits of an in-house designed swirl stabilized 3kW can-type micro gas turbine combustor. Design/methodology/approach The experimental prediction of LBO limits was performed on 3kW swirl stabilized combustor fueled with methane for the combustor inlet velocity ranging from 1.70 m/s to 6.80 m/s. The numerical prediction of LBO limits of combustor was performed on two-dimensional axisymmetric model. The blowout limits of combustor were predicted through calculated average exit gas temperature (AEGT) method and compared with experimental predictions. Findings The results show that the predicted LBO equivalence ratio decreases gradually with an increase in combustor inlet velocity. Practical implications This LBO limits predictions will use to fix the operating boundary conditions of 3kW can-type micro gas turbine combustor. This methodology will be used in design stage as well as in the testing stage of the combustor. Originality/value This is a first effort to predict the LBO limits on micro gas turbine combustor through AEGT method. The maximum uncertainty in LBO limit prediction with AEGT is 6 % in comparison with experimental results.

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Correlation of lean blowoff in an annular combustor

Cited by 22 publications

References 6 publications

Predicting Lean Blowout Limit of Combustors Based on Semi-Empirical Correlation and Simulation

Predicting Lean Blowout Limit of Combustors Based on Semi-Empirical Correlation and Simulation

Prediction of lean blowout performance on variation of combustor inlet area ratio for micro gas turbine combustor

Experimental and numerical prediction of lean blowout limits for micro gas turbine combustor

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