STATIC TEST-STAND PERFORMANCE OF THE YF-102 TUR-BOFAN ENGINE WITH SEVERAL EXHAUST CONFIGURATIONS FOR THE QUIET SHORT-HAUL RESEARCH AIRCRAFT (QSRA)

摘要

The performance of a Lycoming YF-102turbofan engine was measured in an outdoor test stand with a bellmóuth inlet and seven exhaust-system configurations. The configu¬rations consisted of three separate-flow systems of various fan and core nozzle sizes and four confluent-flow systems of various nozzle sizes and shapes. A Lycoming com¬puter program provided good estimates of the engine performance and of thrust at max-imum rating for each exhaust configuration. The internal performance of two different-shaped core nozzles for confluent-flow configurations was determined to be satisfactory. Pressure and temperature surveys were made with a traversing probe in the exhaust-nozzle flow for some confluent-flow configurations. The survey data at the mixing plane, plus the measured flow rates, were used to calculate the static-pressure varia¬tion along the exhaust-nozzle length. The computed pressures compared well with ex-perimental wall static-pressure data. External-flow surveys were made, for some confluent-flow configurations, with a large fixed rake at various locations in the exhaust plume.