ERC Software

ASIPS – Advanced Spray Injection Phenomena Simulator

ASIPS models the breakup and evolution of liquid jet in a crossflow. The program first simulates the development and breakup of the liquid column. It then uses the liquid column answers to initialize a drop transport model that proceeds to a user defines solution plane. It is a computational efficient tool that is ideal for conducting “what if” screening analyses.

Liquid Column

Using the operating conditions at the orifice exit, ASIPS predicts the liquid column trajectory, mass stripped, drop initial properties, and column breakup for user controlled time steps from orifice exit to predicted breakup time. These values are then used to define initial conditions for the drop transport model.

Drop Transport

The drops shed from the liquid column are modeled as they accelerate and evaporate downstream. Drops are binned by location and the drop properties are averaged at each bin.

Output

Liquid Properties
• position & velocity
• diameter
• mass loss

Spray Properties
• penetration
• Saunter mean diameter
• mean velocity
• liquid fuel flux
• vapor fuel flux

Jet-in-crossflow liquid column & spray analysis
• spatially resolved
• time-averaged

Spray properties output
• drop diameter
• liquid phase velocity
• liquid volume flux
• gaseous fuel mass flux

Fast calculation times
• 10 – 100 min per case “batch” mode to run
• multiple cases at in serial

Simple User Interface
• single executable file
• text input file
• program requires only physical properties & operating condition

AFEAT – Automated Feature Extraction Tool

For many applications involving liquid injection, the ability to predict the details of the breakup process often is limited due to the complexity of the two-phase phenomena. Likewise, the ability to experimentally characterize these phenomena is limited, in part due to the need to rely upon visualization tools that are inherently qualitative. As a result, experimental validation of predictions from analytical atomization models or advanced computational fluid dynamic (CFD) simulations is limited.

Visualization diagnostics have evolved substantially in terms of spatial and temporal resolution. Coupling these advancements with an analysis tool to conveniently quantify the results obtained relative to the breakup process offers the potential for a marked increase in understanding of this phenomena. To address this need, ERC developed an automated feature extraction tool (AFEAT), that can be applied to the problems of liquid injection into a crossflow and liquid breakup and dispersion from pressure swirl injectors.

Input

AVI File or set of TIF files from imaging system.

Processing

Once the file(s) is read in, AFEAT does pre-processing to clean up background, orient the image, and carries out an interaction with the user to register key features and calibrate pixels to distance.

AFEAT then carries out operations on each frame to isolate critical regions in the spray including the intact liquid region, the post breakup region, and the background. Using numerous image processing methods, quantitative information about these regions are extracted for each frame and reassembled to allow for time resolved information to be realized.

Output

Intact Liquid
• Boundary
• Penetration/Angle
• Intact Liquid Breakpoint Motion

Spray Droplets
• Position
• Velocity
• Diameter

Correlation Development

By applying AFEAT to parametric experiments, it is possible to quickly develop design tools based on 1000’s of images. Examples for a liquid jet in crossflow include:

Jet-in-crossflow liquid column & spray analysis
• spatially resolved
• time-resolved

Intact Liquid
• Break point
• Angle/trajectory

Spray properties output
• drop diameter
• drop velocity

Fast calculation times
• Process 1000’s of images in an hour

Flexible user interface
• Graphical User Interface with contextual help makes getting started easy
• Text Input File option allows efficient batch mode operation

Works on any .AVI file