Drag and Dirt Deposition Mechanisms of External Rear View Mirrors and Techniques Used for Optimisation Volvo Car Corporation

Format:

Book

Conference/Event

Author/Creator:

Bannister, Mark, author.

Conference Name:

SAE 2000 World Congress (2000-03-06 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2000

Summary:

This paper gives details of the drag and dirt deposition mechanisms related to rear view mirrors. The major design parameters affecting mirror-generated drag and dirt deposition are described. A detailed analysis of the mirror noise properties is not covered for reasons of brevity.A range of test methods is also described which can be successfully used in the mirror optimisation process.The detailed drag breakdown of several rear view mirrors has been made by use of a combination of balance and pressure measurements. The drag breakdown gives an insight into the drag mechanisms and identifies the critical geometry parameters.It is concluded that the relatively high level of drag experienced by some of today's mirrors is primarily the result of premature tip separation and/or an unnecessarily large mirror foot. A level of drag close to the minimum possible, for a given mirror glass area, can be achieved by optimisation of the tip and foot areas.The main mirror-related dirt deposition mechanisms are found to be:The mirror wake structure and direction has been measured and visualised for several rear view mirror shapes and is correlated to measured mirror forces and geometry parameters.A mirror design with the combined properties of low drag and low dirt deposition is possible and has been demonstrated by both wind tunnel and test track methods

Notes:

Vendor supplied data

Publisher Number:

2000-01-0486

Access Restriction:

Restricted for use by site license