Airblast spray in crossflow – Structure, trajectory and droplet sizing

Sinha, Anubhav; Prakash, Ritesh; Mohan, A. Madan; Ravikrishna, RV

doi:10.1016/j.ijmultiphaseflow.2015.02.008

Cited by 45 publications

(15 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[10][11][12] Recent investigations have recognized the importance of this configuration in fuel injection gas turbine combustors. [13][14][15][16][17] This configuration can be especially useful in applications where fuel has to be atomized and evaporated rather quickly; typically in compact combustors for small gas turbines, or for lean premixed prevaporized combustors, where the desired residence time for droplets is small. This configuration appears to be more efficient in atomizing and mixing fuel than the traditional method of injecting liquid jet in crossflow.…”

Section: Introductionmentioning

confidence: 99%

LES of spray in crossflow – Effect of droplet distortion

Sinha

Ravikrishna

2016

International Journal of Spray and Combustion Dynamics

Self Cite

View full text Add to dashboard Cite

The present investigation is focused on modeling of spray in crossflow using Large Eddy Simulations (LES). The modeling efforts are supported by experiments which are used both to provide accurate boundary and initial conditions and to evaluate droplet shapes in the near nozzle region. The droplets are modeled as Lagrangian parcels in an Eulerian continuum. Droplets in such configuration have been found to be distorted and not in perfect spherical shape from experimental results of our previous study. Droplet distortion is computed by Taylor-Analogy Breakup (TAB) distortion model. Each droplet is modelled as damped spring-mass system, where surface tension acts as a spring on the mass of the droplet and viscous dissipation provides the damping effect. The effort is to examine the effect of drag law used and the effect of this distortion on the droplet sizes produced in the flow field. Spray wind-ward trajectory and droplet sizes obtained from simulations are compared with the experimental results available. Although computational spray trajectory shows a reasonable match with experimental values, droplet sizes using the standard TAB model are found to be larger than that from experimental observation. To account for this distortion and its role in early breakup of droplets, constants of the TAB model are modified and the droplet sizes are found to be in good agreement with the experimental data.

show abstract

Section: Introductionmentioning

confidence: 99%

LES of spray in crossflow – Effect of droplet distortion

Sinha

Ravikrishna

2016

International Journal of Spray and Combustion Dynamics

Self Cite

View full text Add to dashboard Cite

show abstract

“…Schematic of the test section is shown in figure 4. The crossflow air is made uniform and the velocity and turbulence profiles are measured and reported elsewhere, along with other details of the experimental facility [14], and only the test section and atomizer will be described here briefly. The test section consists of metal plates for top and bottom wall, and quartz plates from the side walls.…”

Section: Experimental Set-upmentioning

confidence: 99%

“…There are many investigations focusing on this configuration [2][3][4][5][6][7][8][9][10][11][12]. However, injecting liquid in the form of spray appears more promising in terms of providing better control over trajectory, droplet size and velocity [13][14][15][16]. The experimental investigation by Leong et al [13] appears to be the first systematic study of spray injected into a crossflow aimed for gas turbine combustors.…”

Section: Introductionmentioning

confidence: 99%

“…They have used ambient temperature conditions for all their experiments. Sinha et al [14] built upon their findings and carried out experimental investigation for a much wider range of parameters and using different liquids. They have derived a generalized spray trajectory correlation, which is found to be in good agreement with their experimental results obtained for water and ethanol.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental studies on structure of airblast spray in crossflow

Sinha

Ravikrishna

2019

Sādhanā

Self Cite

View full text Add to dashboard Cite

The present investigation is focused on experimental studies on the structure of airblast spray in crossflow. Atomizer is at a higher pressure than ambient and the airblast gas is expected to exhibit features generally found in under-expanded gas jets. High-speed images are captured using shadowgraphy technique. Certain wave-like structures observed in the near-nozzle region are attributed to shock-vortex interactions, generally observed in under-expanded gas jets. Proper Orthogonal Decomposition (POD) analysis has been carried out using these images. POD mode shapes clearly show signatures of shock-vortex oscillations and frequencies close to the screeching frequency observed in under-expanded jets. The POD modes are compared for different conditions and the significance of dynamic structures and their temporal behavior is discussed. Finally, a regime map is also proposed to characterize spray behavior in crossflow.

show abstract

“…In several recent papers, DTV calibration is often performed with a standard calibration plate ( Nishino et al (20 0 0) ; Fdida and Blaisot (2010) ; Castanet et al (2013) ; Sinha et al (2015) ) and validated on a mono-dispersed droplet generator ( Anand et al, 2012 ). In our work, this initial calibration step is performed with calibrated glass beads.…”

Section: Statistical Processingmentioning

confidence: 99%