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132 Military Jet Engine Acquisition lighting, and shutdown), individual component efficiencies and stresses, control systems functions, lubrication system functions, cooling flows, durability, and operability. These assessments are made using static and dynamic strain gauge measurements of flow- path pressures, temperatures, airflow, rotor speeds, fuel flow, thrust, lube-system pressures and temperatures, and control-system signals. The intent of this testing is to evaluate all engine characteristics and functions and to address any deficiencies prior to proceeding to altitude testing. Altitude testing essentially repeats sea-level testing conducted at key flight conditions and is used to verify flight worthiness prior to enter- ing flight test. It is conducted in an altitude chamber that is specially equipped to simulate operating conditions throughout the flight en- velope. Engine inlet pressure and temperature are set to be consis- tent with the altitude and speed conditions to be simulated. At the same time, ambient pressure in the test chamber is made to be con- sistent with the altitude being simulated. Altitude testing is used to evaluate steady-state and transient engine performance, component efficiencies and stresses, control system functions, operability with distortion, augmentor operability, combustor operability,10 thrust, cooling flow, lubrication system function, vibration, and wind- milling capability. Instrumentation and data collection are very simi- lar to those used in sea-level testing. The intent of altitude testing is to evaluate engine characteristics and functions throughout the flight envelope and address any deficiencies prior to flight test in an effort to reduce overall program risk. Three to four test engines within the development program would typically be designated for endurance testing and accelerated mis- sion testing (AMT), hot section life verification, and formal qualifica- tion. Endurance testing is conducted in a sea-level test cell and is used to verify that the life of critical hot and cold section engine parts meets design and specification requirements. Engine endurance is now demonstrated using an AMT. The AMT uses a mission-based simulation, called a duty cycle, to subject the engine in the test cell to the conditions it is likely to experience in actual operation. In ______________ 10More specifically, the ability of the combuster and the augmentor to light and their blowout and auto-relight characteristics are tested throughout the simulated enve- lope.PDF Image | Military Jet Engine Acquisition Technology Basics and Cost-Estimating Methodology
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