Experimental and Numerical Studies on Combustion Model Selection for Split Injection Spray Combustion

Moiz, Ahmed Abdul; Som, Sibendu; Bravo, Luis; Lee, Seong-Young

doi:10.4271/2015-01-0374

Cited by 21 publications

(9 citation statements)

References 46 publications

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“…The results presented in the article are the ones using default model setup and model constants. Converge for spray simulation has been extensively validated, [34][35][36] reproducing spray dynamics under a variety of operating conditions. In this study, the ROI profile from the Zeuch or momentum flux measurement is used as a model input to determine how spray velocity at the nozzle exit changes as a function of time throughout the injection event.…”

Section: Spray Momentum Test Rigmentioning

confidence: 99%

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A comparison of computational fluid dynamics predicted initial liquid penetration using rate of injection profiles generated using two different measurement techniques

Johnson

Krishnamoorthy

et al. 2017

International Journal of Engine Research

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The rate of injection profile is a key parameter describing the fuel injection process for diesel injection. It is also an essential input parameter for computational fluid dynamics simulations of spray flows. In the present work, rate of injection profiles of a multi-hole diesel injector were measured using the Zeuch method and the momentum flux method. The rate of injection profiles measured by the momentum flux method had a faster rise in rate of injection during the initial ramp-up phase than with the Zeuch method. The measured rate of injection profiles were applied in threedimensional computational fluid dynamics simulations of diesel sprays under non-vaporizing and vaporizing conditions with sweeps in injection pressure, bulk charge gas density, and bulk charge gas temperature. Analytical results were compared against experimental data for liquid penetration generated under those conditions. Computational fluid dynamics results with the rate of injection profile measured by the Zeuch method under-predict liquid penetration during the initial ramp-up phase, while computational fluid dynamics results with the rate of injection profiles measured by the momentum flux method showed much better agreement with the experimental data of liquid length and penetration. This suggests that current computational fluid dynamics spray models may be able to more accurately model transient liquid penetration when using the velocity profile developed from momentum flux measurements. Further study is needed to evaluate how computational fluid dynamics predictions of combustion and emissions of affected when using these two rate of injection profiles.

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Section: Spray Momentum Test Rigmentioning

confidence: 99%

“…The results presented in the article are the ones using default model setup and model constants. Converge for spray simulation has been extensively validated, 34–36 reproducing spray dynamics under a variety of operating conditions.…”

Section: Numerical Modelsmentioning

confidence: 99%

A comparison of computational fluid dynamics predicted initial liquid penetration using rate of injection profiles generated using two different measurement techniques

Johnson

Krishnamoorthy

et al. 2017

International Journal of Engine Research

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“…The present study is a follow-up of a series of studies as in Refs. [7,11] in which extensive experimental and computational fluid dynamics (CFD) studies were performed to understand the ignition and sooting characteristics of multiple injections. As part of the experimental campaign, a single-shot PLIF imaging technique is used along with simultaneous application of high-speed schlieren imaging technique within a single injection cycle, to reveal the ignition and soot production characteristics of the main injection.…”

Section: Introductionmentioning

confidence: 99%

Study of soot production for double injections of n-dodecane in CI engine-like conditions

Moiz

Ameen

Lee

et al. 2016

Combustion and Flame

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Soot production mechanism in multiple injections is complex since it involves its dependence on turbulent interactions of constituting injections and their combustion progress. A concise study was performed in a constant-volume combustion vessel by considering a double injection scheme of 0.3 ms pilot injection, 0.5 ms dwell time and 1.2 ms main injection (nomenclature: 0.3/0.5/1.2 ms) with n-dodecane as fuel and replicating the thermodynamic operating condition of a compression ignition (CI) engine. Experimental ambient temperature variations of 900 K and 800 K were performed at 15% ambient oxygen level. Simultaneous planar laser-induced fluorescence (PLIF) of formaldehyde and schlieren imaging techniques were employed to analyze the ignition and flame characteristics experimentally. These studies revealed almost similar heat release rates for a double injection at 900 K and 800 K ambient gas temperatures due to combustion of a longer main injection which is enhanced by pilot combustion event. A lower soot production for 800 K ambient condition over 900 K case was observed, which was concluded to be due to its higher lift-off length which would allow for a leaner combustion of fuel-air mixtures. Numerical simulations were performed using a Large Eddy Simulation (LES) approach by extensively validating the 900 K double injection condition with respect to non-reacting vapor penetration profiles of both injections, reacting jet heat release rate and spatial as well as temporal (qualitative) soot production. As part of LES work, a dwell time variation of 0.65 ms (0.3/0.65/1.2 ms) was performed to reveal the sensitivity of soot production to variations in dwell time. It was observed numerically that marginally higher quasi-steady lift-off length of the 0.3/0.65/1.2 ms injection causes increased entrainment of surrounding oxygen into the flame region. This leads to combustion of slightly leaner fuel-air mixture and hence relatively less soot when compared to a 0.3/0.5/1.2 ms injection.

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“…It needs modification of an accurate combustion model prediction in the computation. CONVERGE a CFD code uses RNG k-ε turbulence by including Automatic Mesh Refinement AMR models a gridconverged CFD 84,85 . There is a strong demand of a simulation software which reduces the time of the development of rotary engine.…”

Section: Computational Fluid Dynamics Cfd Approachesmentioning

confidence: 99%

Combustion Chamber Design Effect on The Rotary Engine Performance - A Review

Boughou

Mohiuddin

2020

IJAE

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Comparatively, this review is meant to focus on possible developments studies of the rotary engine design. The controversial engine produces a direct rotational motion. Felix Wankel derived the triangular rotor shape from complex geometry of the Reuleaux triangle. The Wankel engine simulation and prediction of its performance is still limited. The current work reviews rotary engine's flow field inside the combustion chamber with different commercial software used. It studies different parameters effect on the performance of the engine, such as the effect of the recess sizes and the shape-factor. It is found that the engine chambers design is one of the aspects of improvement opportunities.

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Experimental and Numerical Studies on Combustion Model Selection for Split Injection Spray Combustion

Cited by 21 publications

References 46 publications

A comparison of computational fluid dynamics predicted initial liquid penetration using rate of injection profiles generated using two different measurement techniques

A comparison of computational fluid dynamics predicted initial liquid penetration using rate of injection profiles generated using two different measurement techniques

Study of soot production for double injections of n-dodecane in CI engine-like conditions

Combustion Chamber Design Effect on The Rotary Engine Performance - A Review

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