Lab Test of MIPS Turbodyne II Precleaner with Scavenge Blower Motor.

An engine induction air precleaner system designed for the MIPS was lab tested at both TARDEC and SwRI to measure pressure drop, efficiency and particle size determination. The Turbodyne II Precleaner is a two-stage precleaner installed up-stream of turbocharged diesel engines. A self-cleaning rotating barrier filter is the second component of the Turbodyne II self-cleaning air filter SCAF system and is installed after the turbocharger. Two previous tests of the Turbodyne II SCAF were conducted 1 Reference Appendix A, report page and abstract and 2 Reference Appendix B, report page and abstract Test results showed in general 1 Turbocharger degradation does not occur when exposed to precleaned air and 2 some minor difficulty occurred in achieving normal efficiency requirements andor pressure drop limits across SCAF barrier filter for up to 200 hours. TARDEC and SwRI pressure drop lab tests were in agreement reaching a maximum of 11.2 to 11.4 inches of water at rated flow of 2600 cfm. Likewise efficiency testing at TARDEC and SwRI conducted on PTI coarse test dust was nearly in agreement with TARDEC obtaining an average overall efficiency of 98.15 compared to the slightly higher average overall efficiency of 98.624 obtained by SwRI. Turbodyne II precleaner particle size determination tests conducted by SwRI See Appendix G, report showed for three dust concentrations zero visibility, half zero visibility and quarter zero visibility separation efficiency at low concentration levels becomes more sensitive to airflow. For the three dust concentrations tested, test results showed the precleaner had an effective cut size ranging from about 3 to 6.5 microns depending on concentration and airflow rate. The cut size is the particle size where the probability of collection is 50.