Gas particle flows about a Cobra probe with purging

M. M. De Guzman*, C. A J Fletcher, M. Behnia

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


The detailed flow behaviour around a special purpose four-hole Cobra Pilot pressure probe with purging is investigated computationally in gas and gas-particle flows. The incompressible steady state Navier-Stokes equations for the gas phase are solved numerically using a general purpose computational fluid dynamics code. Computational results are presented at a typical Reynolds number of 2 × 103. The use of purging gas blown out of the pressure ports to prevent particle blockage is modelled, providing design and operational data: (1) on the effects of purging gas on the calibration characteristics of the probe, and (2) the effectiveness of purging on particle blockage prevention. A Lagrangian procedure is used to calculate the particle trajectories via a one way coupling formulation. A continuous purging velocity of 30% of the freestream velocity prevents blockage by solid particles and allows a monotonic calibration to be maintained.

Original languageEnglish
Pages (from-to)121-134
Number of pages14
JournalComputers and Fluids
Issue number2
Publication statusPublished - 1995
Externally publishedYes


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