An accurate propulsion system simulation for short take-off vertical landing (STOVL) aircraft is a critical element for research on design methodologies for integrated STOVL aircraft flight and propulsion control systems. Such a simulation must in principle, mimic steady-state and transient sub-system performance. For modern real-time-system analyses, it is important that the STOVL simulation include the dynamic of component feeder ducts, engine inter-component volumes, and the tailpipe. Traditional engine simulations often include intercomponent volume dynamic modules, but the intent is more often for the purpose of coupling static components (to avoid the need for iterative equation solutions) than for an accurate solicitation of gas dynamics effects. As such the traditional approach calls only on a mass balance and a simplified form of the energy equation. There is a need for a volume dynamics model with the simplicity and computational speed of the traditional approach, but with the capability to incorporate more detailed heat transfer and fluid-dynamic effects that are likely features of STOVL systems. In the present work, two approaches to modeling volume dynamics are explored and compared with a view toward application to real-time propulsion system simulation. The first and simplest method takes the traditonal approach in the problem formulation, in the second approach a momentum balance is included and the heat equation is replaced with the complete energy balance. We briefly remark on a third method under development which employs an entropy balance in place of the energy equation.
STOVL propulsion system volume dynamics approximations
Volumen Dynamik Näherungen für Kurzstartantriebssysteme
Forum on Unsteady Flow 1989, The Winter Annual Meeting of the ASME ; FED-83 , Dec ; 5-7
1989
3 Seiten, 3 Bilder
Conference paper
English
STOVL propulsion system volume dynamics approximations
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