Spray G – Internal Flow Modeling
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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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Spray G – Internal Flow Modeling

Gasoline Spray (Spray G)

Topic 3.5Internal 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?

  • What is the deviation in mass flow per hole?

Outline

  • Model setup and assumptions

  • Mass flow calculations

  • Nozzle exit velocity field

  • Summary and discussion


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


Spray G – Run to Steady State

Predicted CD ~ 0.50

Cv ~ 0.73

CA~ 0.69

GM Measurement CD~ 0.52



Spray G – Velocity Cut Planes

Nozzle Hole Exit

Counterbore Exit

Time=2.8ms


Discharge Coefficient Per Hole

2

3

1

8

4

5

7

6

Time=2.8ms


Discharge Coefficient Per Hole

2

3

1

8

4

5

7

6

Time=2.8ms


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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