Advanced Techniques for Flow Simulation in Automotive Climatic Wind Tunnels

Paper #:
  • 910312

Published:
  • 1991-02-01
Citation:
Goenka, L., "Advanced Techniques for Flow Simulation in Automotive Climatic Wind Tunnels," SAE Technical Paper 910312, 1991, https://doi.org/10.4271/910312.
Author(s):
Pages:
12
Abstract:
Two techniques for advanced flow-simulation in automotive, climatic wind-tunnels have been presented. These are the Slotted-Wall Extension * for improved flow simulation over the test vehicle, and methods for improved thermal boundary-layer simulation. The Slotted-Wall Extension gives a reference q-correction that is relatively independent of vehicle configuration and blockage, prevents the formation of shear layers in the nozzle exit flow, suppresses mean-flow pulsations in the test chamber, and reduces vehicle pressure-simulation errors, with resultant improvement in critical cooling airflows.Measurements over a heated, flat surface show that the open road thermal boundary-layer exhibits a turbulent temperature profile, and can be split into a thin sublayer region in which most of the temperature change occurs, and an outer layer in which a shallow, linear temperature gradient exists. From a practical viewpoint, adequate outer layer simulation can be easily obtained by heating the lower 0.5 m to 1 m of the wind tunnel flow to a temperature that is up to 5 deg C above ambient. Future trends towards lower automobile underbody clearances would necessitate the simulation of the thermal sublayer region. This can be achieved by the tangential injection of hot air along the wind tunnel floor.
Access
Now
SAE MOBILUS Subscriber? You may already have access.
Buy
Select
Price
List
Download
$27.00
Mail
$27.00
Members save up to 40% off list price.
Share
HTML for Linking to Page
Page URL

Related Items

Article
2017-03-13
Book
2002-04-15
Training / Education
2018-02-05
Technical Paper / Journal Article
2010-10-19
Technical Paper / Journal Article
2010-09-28