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Gasoline Spray (Spray G) Topic 3.5 Internal flow modeling Ron Grover (GM)

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Spray G – Internal Flow Modeling. Gasoline Spray (Spray G) Topic 3.5 Internal flow modeling Ron Grover (GM) . Overview. Research Questions Can we actually get results? What is a representative discharge coefficient injector ? What is the flow field exiting the injector?

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slide1
Spray G – Internal Flow Modeling

Gasoline Spray (Spray G)

Topic 3.5Internal flow modeling

Ron Grover (GM)

slide2
Overview

Research Questions

  • Can we actually get results?
  • What is a representative discharge coefficient injector?
  • What is the flow field exiting the injector?
  • What is the deviation in mass flow per hole?

Outline

  • Model setup and assumptions
  • Mass flow calculations
  • Nozzle exit velocity field
  • Summary and discussion
slide3
Spray G – Model Setup
  • Fluid Solver HRMFoam (c/o UMass)
  • Turbulence k-epsilon
  • Assumptions Submerged Fluid, Incompressible, Isenthalpic
  • Meshing 414,000 cells
  • Mesh Topology Polyhedral (STAR-CCM+)

2 layer extrusion on wall

  • Needle Motion None. Fixed maximum lift 45 µm

Nozzle cell size ~ 20-30 µm

L/D ~ 1 (nozzle)

L/D ~ 1.2

(c-bore)

Cell size ~ 30 – 65 µm

slide4
Spray G – Run to Steady State

Predicted CD ~ 0.50

Cv ~ 0.73

CA~ 0.69

GM Measurement CD~ 0.52

slide6
Spray G – Velocity Cut Planes

Nozzle Hole Exit

Counterbore Exit

Time=2.8ms

slide9
Summary & Discussion Points

Initial Findings

  • CFD calculations show that deficit in discharge coefficient is equally attributed to both a velocity and area deficit
  • The velocity distribution per hole is biased towards the side of the hole closest to the injector axis
  • An instantaneous snapshot of discharge coefficient per hole shows variation; a finding that requires further investigation

Call for Additional Contributions!

  • Solicit various modeling approaches (1-fluid, 2-component, etc. )
  • Increased mesh resolution
  • Effect of plenum size
  • Needle motion effects
  • Internal-to-external nozzle flow coupling
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