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Title: Peening Effect On Flow Resistance Of Air
Author: Iida, K. and Miyazaki, K.
Source: Conf Proc: ICSP-4, (p. 73-82)
Publication year 1990
Document number: 1990048
Number of pages: 10
Abstract:
Shot peening produces many dents on the surface of work material. Geometry of dent is a segment of sphere similar to dimple of golf ball, therefore peened surface may be
affects the flow resistance of air. Drag coefficient was measured in air flow on polished and various peened specimens. Used shot diameter are 1.00 - 2.38 mm. The
velocities of air flow are 5 - 25 m/s. Raynold's number are 2.98 x 10(4) - 1.49 x 10(5). The surface roughness of specimen are 0.1 - 32.5 um produced by polishing and shot
peening. Area coverage of shot peened specimens are 21 - 100%. The pitches of fringe to fringe of dent obtained from profile records on peened surface are examined. The
relation between resistance (D) of air flow and drag coefficient (Cd) is as follows:
D = Cd . K . 1/2 pV
where K: geometry of specimen
p, V: density and velocity of air
Drag coefficient of shot peened specimen decreased 2.4 - 11 % compared with polished one, and decreased 0.81 - 8.1 % by area coverage and also decreased 0.86 - 3.4 % by
pitch of fringe.
Descriptors: Shot peening; Drag coefficient; Flow resistance; Area coverage
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This page last revised: 04/24/2008