Effects of Micronic Filtration on Turbine Engine Lubricant Deposition.
Final rept. 15 Aug 80-15 Aug 83,
SOUTHWEST RESEARCH INST SAN ANTONIO TX
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The effects of micronic filtration on deposit forming characteristics of turbine engine lubricants were investigated, employing a hot-wall deposition test rig. The test-oil sump of the rig was modified with a wear-metal generator and for filtration tests, a filter housing was installed in the test lubricant pressure line. Without filtration, 15 micron filtration and 3 micron filtration test were performed. Ten MIL-L-7808 or MIL-L-7808 type lubricants were evaluated under six different test conditions. Accordingly, a special test method was used to study the effect of micronic filtration on deposition of the lubricants both with mil steel wear generation and without wear generation. Also, the effects on both kinematic viscosity and neutralization number of the test lubricants were determined and are presented. A direct calculation of wear-metal generation was provided by weight-loss measurements of the mild-steel wear coupons mounted below the lubricant level in the sump. Also, the concentration of iron in samples of the test lubricants taken during testing was determined by energy dispersive X-ray fluorescence and these results are presented and discussed. A statistical analysis of the three response variables, namely deposit rating, viscosity increase and neutralization number change, by analysis of covariance was performed.
- Lubricants and Hydraulic Fluids