NDLI: Dynamic PIV measurement of a compressible flow issuing from an airbag inflator nozzle

Content Provider	Springer Nature Link
Author	Lee, Sang Joon Jang, Young Gil Kim, Seok Kim, Chang Soo
Copyright Year	2006
Abstract	Among many equipment for passenger safety, the air bag system is the most fundamental and effective device for an automobile. The inflator housing is a main part of the curtain-type air bag system, which supplies high-pressure gases in pumping up the air bag-curtain which is increasingly being adapted in deluxe cars for protecting passengers from the danger of side clash. However, flow information on the inflator housing is very limited. In this study, we measure the instantaneous velocity fields of a high-speed compressible flow issuing from the exit nozzle of an inflator housing using a dynamic PIV system. From the velocity field data measured at a high frame-rate, we evaluate the variation of the mass flow rate with time. The dynamic PIV system consists of a high-repetition Nd:YLF laser, a high-speed CMOS camera, and a delay generator. The flow images are taken at 4000 fps with synchronization of the trigger signal for inflator ignition. From the instantaneous velocity field data of flow ejecting from the airbag inflator housing at the initial stage, we can see a flow pattern of broken shock wave front and its downward propagation. The flow ejecting from the inflator housing is found to have very high velocity fluctuations, with the maximum velocity at about 700 m/s. The time duration of the high-speed flow is very short, and there is no perceptible flow after 100 ms.
Starting Page	377
Ending Page	381
Page Count	5
File Format	PDF
ISSN	10032169
Journal	Journal of Thermal Science
Volume Number	15
Issue Number	4
Language	English
Publisher	Science Press
Publisher Date	2006-01-01
Publisher Place	Beijing
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Airbag inflator PIV automobile Mechanics, Fluids, Thermodynamics Engineering Fluid Dynamics Engineering Thermodynamics, Transport Phenomena
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics

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