Intake port performance has significant influence on engine
power output, fuel economy, and exhaust emissions.
Flow testing of intake ports is an integral part of total
engine design and optimization. Southwest Research Institute (SwRI) maintains a flow bench
facility with a flow capacity of 1000 SCFM at 20 in. water differential pressure that is
dedicated to port flow measurement and characterization.
Air motion for many sizes and types of engines is
characterized on the SwRI flow bench facility.
New cylinder head designs are compared to a large
database of production and prototype heads.
Measurement of in-cylinder air motion is becoming increasingly
important due to exhaust emissions and engine efficiency considerations. SwRI is the
industry leader in measuring swirl, tumble, and combined air motion. The Institute's
state-of-the-art design impulse swirl meters provide more accurate and repeatable
measurements than other types of swirl meters.
Intake Port Development
Intake ports are parametrically designed using the latest solid
Intake ports are designed to provide the optimum
balance between air flow and desired in-cylinder air motion characteristics. Parametric
models of the ports are created based on fundamental engineering principles and years of
port design experience.
Rapid prototyping techniques such as CNC machining or
stereolithography are used to produce prototype flow boxes directly from solid geometry
files. Casting core patterns are made from the same geometric database as the flow box,
ensuring flow accuracy in production components.
SwRI Wet Flow Bench Facility
SwRI maintains a steady-state water pumping flow bench that
provides visual verification of flow characteristics in engine components. This flow bench
facility can also be used to identify stagnation or recirculation zones.
This transparent flow section is used in conjunction
with neutral density particles to aid in flow visualization. Other components such as
ports and manifolds can also be analyzed on the wet flow bench.
This flyer was published in February 1997. For more information
about SwRI flowbench facilities, contact
Doug Eberle, Manager, Phone (210) 522-5260, Fax (210) 522-4581,
and Vehicle Research Division, Southwest Research Institute, P.O. Drawer
28510, San Antonio, Texas 78228-0510.
High-speed photography or laser doppler anemometry can
be used to obtain a flow velocity profile of the test component. This information can be
used for geometry modifications, or verification of CFD results.
Engine, Emissions and Vehicle Research Brochures
SwRI Technical Divisions