Procedure for the Continuous Sampling and Measurement of Nonvolatile Particulate Matter Emissions from Aircraft Turbine Engines ARP6320B

DOI: https://doi.org/10.4271/ARP6320B

Issuing Committee: E-31P Particulate Matter Committee

Publisher: SAE International

Rationale: This SAE Aerospace Recommended Practice (ARP) revision provides updates to the system particle loss, sampling probe, system cleanliness, and nonvolatile particulate matter (nvPM) instrument requirements sections. Minor clarifications or editorial changes throughout document are also included. This revision is limited in scope. a System Particle Loss: An updated definition of the T1 location from Diluter1 inlet to Splitter1 metal. This ARP revision (as well as the latest revision to ARP6481) implements an additional Section 2 thermophoretic loss for system loss factor calculation (which also accounts for Diluter1 penetration). The Section 2 thermophoretic loss is expected to be an interim revision while further work is performed to verify Section 2 particle loss and improve uncertainty. To help this work, this ARP has been revised to include reporting of additional Section 2 measured sampling system temperatures near the Diluter1 inlet that are measured in some specific system designs. b System Cleanliness: Improved cyclone cleanliness wording to help system user operability. c nvPM Instrument Requirements: Added clarifications on nvPM instruments for end users to maintain documentation of performance specifications, a flow chart highlighting specific steps required before measuring nvPM mass emissions from an aircraft engine, and requirements for calibration DFCAS. d Probe: Added clarity that the pressure drop requirement is for multi-hole probes only.