High Performance Inertial Air Filters

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High Performance Inertial Air Filters

• DMS Project Group 7
• Marcus Andrews
• Elizabeth Bonilla
• Kevin Gomes
• Joe Vandeveer
• Michael Vitarelli
• Kachuen Wong

Prof. Mavroidis Prof. Knight, Advisor 12 / 9 / 03
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Outline

• Background
• Objective
• Design Selection
• Calculations
• CAD Modeling
• Computational Fluid Dynamics (CFD)
• Rapid Prototyping
• Experimental Design

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Background

• Proper filtration of air is essential in todays
  sophisticated mechanical systems
• Internal combustion engines
• Diesels
• HVAC
• High performance required for applications in
• Military - Naval Ships Engines
• Industry
• Example - Locomotives traveling through desert
  environments

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Background

• Types of Air Filters
• Membrane Filters
• Wet Filters
• Electrostatic Filters
• Inertial Filters
• Why Inertial Filters?
• Less Moving Parts, Low Maintenance
• No Energy Requirements
• Infrequent Filter Changes

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Objective

• Design an optimal Inertial Air Filter for a Honda
  Model EB11000 portable generator
• Specifications
• Dimensions no larger than 7.5x7.5x2
• Pressure drop no greater than 4.35 psi
• (30 kPa)
• 80 separation of 50-micron diameter
  particles

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Accomplishments - Design

• Selection Matrix

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Top Preliminary Designs

• Based on centrifugal inertia
• Induced swirling of airflow forces particulate to
  side walls for separation
• Dimensions outside of design specifications

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Top Preliminary Designs (cont.)
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Model Development

• Allowable Pressure Drop
• Combustion Analysis of Octane
• Using engines given fuel consumption rate and
  stoichiometric combustion, the flow rate of air
  required can be calculated
• C8H18 (O23.76 N2) -gt CO2 H2O N2
• C8H18 (O23.76 N2) -gt 8 CO2 9 H2O N2
• C8H18 12.5 (O23.76 N2) -gt 8 CO2 9 H2O N2

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Model Development

• Ideal Gas Law
• Applied ideal gas law using displacement of
  engine to obtain air pressure at inlet of engine,
  also the outlet of the filter
• PV nRT
• P nRT/V
• P 72383 kPa

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Model Development

• Experimental Calculations
• Similitude
• Reynolds number
• This number must be similar in both model and
  prototype to obtain accurate results

V Velocity D Diameter of Pipe ? Kinematic
Viscosity
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Final Designs for Consideration

• Centrifugal motion forces particles to the sides
  for removal

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Final Designs for Consideration
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Final Design Selection
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Computational Fluid Dynamics

• Fluent
• State-of-theart software for modeling fluid flow
• Simulations
• Particle separation
• Pressure drop
• Velocity field

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Pressure Drop

• Very low pressure drop 0.032 kPa

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Particle Separation

• 1-micron particles consistently pass through.
• Almost all larger particles are removed.

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Experimental Design

• What Do We Want to Measure?
• Pressure drop through filter
• Inlet and Outlet Pressure
• Particle Separation
• Particles in Particles out
• Air Mass Flow Rate

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Experiment Setup
Funnel with throttling valve
Enclosed Chamber
Test Section
Shop Vacuum and Collection Bin
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Lab Safety Requirements

• Long Clothing
• Safety Goggles
• Face Masks
• No open-toe shoes
• Particles contained in a static-dissipative
  chamber

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List of Components

• The following components are vital to measuring
  the parameters we wish to test in the experiment

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Conclusions

• Inertial air filters have distinct advantages
  over conventional filters.
• Top designs have been selected according to in
  depth analysis.
• Future plans
• Fabrication of experiment and testing
• Further optimization of designs

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Questions?

• QA Session