ATK SPACE SYSTEMS LLC

TASK ORDER - STATEMENT OF WORK (SOW) TASK TITLE: 8-FOOT HIGH TEMPERATURE TUNNEL (8 HTT) MIXER LINER AND MACH 5 HIGH DYNAMIC PRESSURE THERMAL ANALYSIS 1.0 INTRODUCTION/BACKGROUND: PLANNED FUTURE TESTING IN THE NASA LANGLEY 8 HTT REQUIRES OPERATION OF THE EXISTING FACILITY MIXER AND MACH 5 HIGH DYNAMIC PRESSURE (M5HIQ) NOZZLE AT TEMPERATURE LEVELS EXCEEDING THE DESIGN VALUE FOR THAT HARDWARE. THE 8 HTT MIXER IS THE LOW VELOCITY REGION IMMEDIATELY UPSTREAM OF THE M5HIQ NOZZLE. INSIDE THE FACILITY MIXER, DILUTION AIR AND HOT FLOW FROM THE FACILITY COMBUSTOR ARE MIXED TOGETHER TO FORM THE ENTRANCE FLOW TO THE M5HIQ NOZZLE. FOR A NOMINAL MACH 5 TEST, THE MIXED FLOW TEMPERATURE IS APPROXIMATELY 2150 RANKINE. THE FACILITY HAS CONDUCTED NUMEROUS TESTS AT THIS NOMINAL MACH 5 CONDITION AND IS CAPABLE OF DELIVERING STEADY OPERATIONAL CONDITIONS FOR PERIOD OF 100 SECONDS WITHOUT EXCEEDING HIGH TEMPERATURE INTERLOCKS INSTALLED AT KEY LOCATIONS ON THE MIXER LINER AND M5HIQ NOZZLE. FUTURE CUSTOMERS HAVE IDENTIFIED TEST REQUIREMENTS AT CONDITIONS SIMULATING FLIGHT AT MACH 5.5. THIS SIMULATION REQUIRES THAT BOTH THE MIXER LINER AND THE EXISTING MACH 5 NOZZLE BE OPERATED AT TEMPERATURES THAT EXCEED THE DESIGN VALUE. IT IS KNOWN THAT EXCEEDING THE DESIGN TEMPERATURE IS ACCEPTABLE AS LONG AS THE RUN TIME IS SHORTENED SO THAT RED-LINE TEMPERATURE LIMITS ARE NOT VIOLATED DURING A TEST RUN. HOWEVER, THE ALLOWABLE RUN DURATION IS NOT KNOWN. THE ALLOWABLE RUN TIME DURATION AT TEMPERATURES EXCEEDING THE NOMINAL DESIGN VALUE MUST BE KNOWN SO THAT FUTURE FACILITY USERS CAN DETERMINE HOW MANY RUNS ARE REQUIRED FOR THEM TO COMPLETE THEIR REQUIRED TEST MATRIX. 2.0 SCOPE&OBJECTIVE(S): 2.1 THE SCOPE OF THIS TASK ORDER IS TO CONDUCT AN ANALYTICAL STUDY TO DETERMINE THE ALLOWABLE RUN TIME (SECONDS) FOR THE MIXER AND THE M5HIQ NOZZLE AT STAGNATION TEMPERATURE LEVELS EXCEEDING THE NOMINAL DESIGN LEVEL AT NOZZLE INLET STAGNATION PRESSURE LEVELS PROVIDED AS GOVERNMENT FURNISHED INFORMATIO