Suchergebnisse

Acceptance testing of the Turbojet Engine Test Chamber was conducted during the week of 9 December 1963 by personnel from the U.S. Naval Post­ graduate School, Department of Aeronautics, from the Overhaul and Repair Department, NAS North Island and from the Bureau of Naval Weapons Fleet Readiness Representative--Pacific. A J-57-BB turbojet engine which had undergone major overhaul and testing at NAS North Island was utilized as the correlating powerplant for this investigation. The test data reveal satisfactory engine performance correlation between the subject chamber and the North Island facility. Sizeable discrepancies were noted in these correlating data; however, each deviation was traced to a known defect in the USNPGS test cell. All of the major system s in the facility operated satisfactorily and controllability of the jet engine was adequate . Minor rework is required on the instrumentation systerns for attaining complete control and utilization of the chamber. The aerodynamic charac­teristics of the facility appear to be excellent. The acoustic survey revealed that the Sound Pressure Levels outside of the facility were consistently exceeded when operating the engine at Military Power and above . The movement of exhaust augmenter to its most forward position accentuated the over-limit conditions. The excessive SPL values were noted in all frequency ranges from 75 cps to 10,000 cps and were observed primarily in the area in front of the test facility. Other test facility discrepancies were primarily component failures which were the result of faulty design. Examples of these defects are; the failure of the exhaust augmentor tube retaining supports, the lack of control of exhaust cooling water, the mechanical failure of the lighting fixtures in the test chamber and the excessive fuel flow indicator fluctuation s at all power settings. Correction of each discrepancy noted herein would result in the establishment of a jet engine test facility which could be utilized for the most exacting research activities.