Mixing Zone Optimization of a Rich-Burn/Quick-Mix/Lean-Burn Combustor

Blomeyer, Malte M.; Krautkremer, Bernd; Hennecke, Dietmar K.; Doerr, Thomas

doi:10.2514/2.5425

Cited by 18 publications

(11 citation statements)

References 7 publications

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“…In particular, the role of the momentum flux ratio J was highlighted. Some publications also deal with the mixing of multiple jets in a confined crossflow ( [11][12][13][14][15]). The influences of different geometrical parameters (spacing between jets S, size and shape of the holes, distribution of the holes on the wall surface, and height of the channel H) were analyzed.…”

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confidence: 99%

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Experimental Investigation of the Jets in Crossflow: Nonswirling Flow Case

Strzelecki¹,

Gajan²,

Gicquel³

et al. 2009

AIAA Journal

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The mixing of eight isothermal jets issuing in a fully developed circular pipe flow is investigated by means of laser Doppler anemometry, particle image velocimetry, and planar laser induced fluorescence techniques. Two values of the momentum ratio are considered. Unsteady and steady flow patterns are analyzed. Characteristic frequencies are deduced from spectral analysis. Velocity and scalar concentration fields are compared. The mean centerline concentration decay is characterized. The analysis of the flow instabilities is focused on the wake-type structures downstream of the jets and the shear layer structures appearing between the jet and the main flow. The results on the wake-type structures are consistent with previous observations done on a single jet. In particular, the influence of the velocity ratio on the signal-to-noise ratio is confirmed. The Strouhal number associated with the shear layer structure depends on the velocity ratio and on the Reynolds number. The comparison between the velocity and concentration fields confirms the difference in the jet trajectories deduced from these two fields. The detailed analysis of the concentration field gives useful information on the influence of the confinement on the jets' behavior. Nomenclature b = distance from the maximum concentration location where Cx; b 0:5C max x, m b in = b value toward the wall, m b out = b value toward the pipe axis Cx; y; z = concentration C max x = maximum concentration value in the section D = pipe diameter, m d = jet diameter, m J = momentum flux ratio ( jet U 2 jet = o U 2 o ) k = kinetic turbulence level, m=s 2 Q m axial = mass flow rate of the crossflow, kg=m 3 Q m jets = mass flow rate of the jet flow,kg=m 3 R = jet-to-crossflow-velocity ratio (U jet =U o ) r; ; x = polar coordinate Re jets = Reynolds number calculated from the jet diameter and the jet bulk velocity Re o = Reynolds number calculated from the pipe diameter and the upstream bulk velocity s = spatial coordinate along the jet trajectory, m St j = Strouhal number calculated from the jet diameter and the jet bulk velocity St o = Strouhal number calculated from the jet diameter and the upstream bulk velocity U jets = jet bulk velocity, m=s U o = main flow bulk velocity, m=s x; y; z = Cartesian coordinate y max = distance from the wall where C max x is reached

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“…The mixing of a transverse jet in a nonconfined environment has been studied for more than 60 years ( [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]). A detailed description of this work may be found in Margason [2] and Smith and Mungal [7].…”

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confidence: 99%

Experimental Investigation of the Jets in Crossflow: Nonswirling Flow Case

Strzelecki¹,

Gajan²,

Gicquel³

et al. 2009

AIAA Journal

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“…One is enhanced mixing in the primary combustion region, and the other is tuning of the air mass flow ratio among the fuel nozzle, the primary and secondary combustion regions, and the wall cooling. Much research has been performed on these factors, both in the literature [8][9][10][11][12][13][14] and in the development process for our combustor.…”

Section: Combustor Design Conceptmentioning

confidence: 99%

Emission Characteristics Through Rich–Lean Combustor Development Process for Small Aircraft Engine

Makida

Kurosawa

Yamada

et al. 2016

Journal of Propulsion and Power

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Following increasing awareness of aircraft emissions and demand for technologies to reduce NOx emissions, experimental research has been conducted to develop a combustor for a small aircraft engine in the TechCLEAN of Japan Aerospace Exploration Agency project. The combustor was tuned to produce rich-lean combustion behavior through combustion tests, including full annular combustion experiments, under atmospheric and actual operating conditions of the target engine. Excellent combustion performance was observed. The final, optimized full annular combustor achieved a reduction of NOx emissions below 40% of the standard regulated by Committee on Aviation Environmental Protection/4 of International Civil Aviation Organization while maintaining low CO and total hydrocarbon emissions and showing superior exit temperature profiles and lean blow-out performance. Through the combustor development process, the dependence of combustion characteristics on combustor configuration was also clarified.

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“…Many references in the literature suggest that the diameter of the jets does not affect either mÏxing nor combustion efficiency-The design of the modules tested wes done assuming that the diameter of the jets is not affecting wmbusti~n-Recent references in the iiterature on non-reacting cross-flows (Blomeyer et al (1999)) suggest that the diameter can affect mixing. As an extension to the investigation of the parameters Secting combustion efficiency, the effect of the jets diameter can be explored.…”

Section: Recommendatioas For Friture Workmentioning

confidence: 99%

The Effect of Jet Mixing on the Combustion Efficiency of a Hot Fuel-Rich Cross-Flow

Boutazakhti

Thomson

Lightstone

2001

Combustion Science and Technology

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2000Many combustion systems inject air into a hot fuel-nch cross-flow to minimize carbon monoxide and unbumed hydrocarbon emissions. Exemples hclude staged air injection in fluidized bed cornbustors, gas turbine engines, and electric arc fÙmace exhaust aflerbumers. Low CO and m b w t hydrocarbon emissions are important design objectives. Efforts in modehg combustion have fded in accurately predicting the levels of these emissions. The xnain aim of this study is to irnprove our understanding of the relationship between mixing, chernical kinetics, and combustion &ciency for air jets in a hot reacting cross-flow.Carbon monoxide and hydrogen concentration measurernents have k e n made for six different round jet configurations issuing air into a hot reacting cross-flow. The study of the performance of four different 9 round jets modules having diffêrent jet diameters indicated that the overall equivalence ratio bas a significant effect on the maximum combustion &ciency. An equivalence ratio of approxbateiy 0.8 leads to the best combustion efficiency for all of the 9 round jet modules. This result is similar to what is observeci in premixed combustion. The predominance of the S i of the equivalence ratio suggests that some premixing between the jets and the cross-flow takes place prior ii to combustion. The rest of the d e n t s weze run such that the optimum mixing 4-24List of Tables Table 3- The mean value of the total cacbOn concentration at x/D=1.5

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Mixing Zone Optimization of a Rich-Burn/Quick-Mix/Lean-Burn Combustor

Cited by 18 publications

References 7 publications

Experimental Investigation of the Jets in Crossflow: Nonswirling Flow Case

Experimental Investigation of the Jets in Crossflow: Nonswirling Flow Case

Emission Characteristics Through Rich–Lean Combustor Development Process for Small Aircraft Engine

The Effect of Jet Mixing on the Combustion Efficiency of a Hot Fuel-Rich Cross-Flow

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