Browse Publications Technical Papers 2006-32-0019

Experimental Apparatus for the PIV Validation of Gas-Dynamic and CFD Engine Models 2006-32-0019

The single shot apparatus creates a pressure wave (compression or rarefaction) by releasing a pressure or vacuum from a blowdown cylinder. The wave is contrived to be representative of cylinder blowdown or the suction wave that emanates from an engine intake valve during induction. Generated waves may be fired into a quiescent pipe or system of pipes that represent the ducts found on an engine.
The most significant features that distinguish the new apparatus from any previous are that it uses a poppet valve to release the wave and that the apparatus is largely automatic, enabling the generation of a new wave every 15 seconds or so.
The particular version of the apparatus described here has been conceived to allow a low speed background flow to be maintained in the pipe system between waves. The purpose of this is to allow microscopic particles to be kept in suspension in the air to facilitate flow studies using Particle Image Velocimetry (PIV) or Laser Doppler Anemometry (LDA). Sample PIV results are presented to demonstrate the apparatus and illustrate the build up of a boundary layer in a pressure wave.


Subscribers can view annotate, and download all of SAE's content. Learn More »


Members save up to 40% off list price.
Login to see discount.
Special Offer: With TechSelect, you decide what SAE Technical Papers you need, when you need them, and how much you want to pay.