Accession Number : ADB022802


Title :   Fan/Ram Duct Program


Descriptive Note : Final rept. Oct 1972-Oct 1973 on Phase 1


Corporate Author : PRATT AND WHITNEY AIRCRAFT WEST PALM BEACH FL FLORIDA RESEARCH AND DEVELOPMENT CENTER


Personal Author(s) : Booz, Daniel E ; Levesque, Al ; Thayer, Edward B


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/b022802.pdf


Report Date : Oct 1973


Pagination or Media Count : 62


Abstract : The Phase I program described in this report is the initial 12-month effort of a planned three-phase program. It started with an analysis of the aerodynamics of the combination fan duct/ram duct used in the P and WA (trade mark) STFRJ368 turbofan-ramjet study engine. This was followed by the design of an aerodynamic test rig simulating the fan/ram duct configuration, including a model fan. The rig will be tested in Phase II to provide aerodynamic data (loss coefficients, flow profiles, etc.) at various steady-state points during the transition from turbofan to ramjet. A digital dynamic engine simulation computer program was also formulated and checked out during Phase I. The checkout of the program was carried through transient transition test cases to validate the simulation. However, the test cases are not designed or optimized transitions; they illustrate that the computer program is operational. The computer program will then be used for transition control studies in later phases to define the control system and logic required for engine operation and smooth, stable transition from turbofan to ramjet and vice-versa.


Descriptors :   *RAMJET ENGINES , *TURBOFAN ENGINES , AERODYNAMIC CHARACTERISTICS , AERODYNAMIC CONFIGURATIONS , AERODYNAMICS , AIR FLOW , COMBUSTORS , COMPUTER PROGRAMS , COMPUTERIZED SIMULATION , DUCT INLETS , DYNAMIC TESTS , FLOW FIELDS , FUEL AIR RATIO , PRESSURE GRADIENTS , PRESSURE MEASUREMENT , SIMULATION , SKIN FRICTION , THRUST


Subject Categories : Jet and Gas Turbine Engines


Distribution Statement : APPROVED FOR PUBLIC RELEASE