Influence of the Sampling Procedure on Extracted Jet Engine Exhaust Gas Emission Samples

The purpose of this thesis is to analyze the effects of an intrusive sample extraction process on the thermo-chemistry of extracted gas samples taken from exhaust of a GE-J85-H turbojet engine. The engine testing took place at University of Tennessee Space Institute in Tullahoma, TN, where the J85 was installed in a test bay of a research facility. The results of the analysis validate that testing methods used had a low probability of disturbing the exhaust chemistry. The tools used to analyze the thermal history of the extracted samples were the NASA CEA and LSENS programs. Several different cases of exhaust chemistry analysis were run using each program to evaluate exhaust species sampling procedures used during the operation of the J85 engine. The LSENS program validated that the flow through the augmenter, for throttle positions from idle to 100% military power (but non-afterburning), was chemically frozen and that the process of extracting and cooling (quenching) of extracted samples was predicted to not affect the sample concentrations or mass fractions.