The Role Of Scramjet Flowpath Design In Multidisciplinary Design Optimization Of Hypersonic Vehicle
- Paper number
IAC-06-C4.P.5.04
- Author
Mr. Xu Dajun, Beijing University of Aeronautics and Astronautics, China
- Coauthor
Prof. Guobiao Cai, Beijing University of Aeronautics and Astronautics, China
- Coauthor
Prof. Xu Xu, Beijing University of Aeronautics and Astronautics, China
- Year
2006
- Abstract
Due to the highly integrated engine and airframe, scramjet as high speed propulsion system of airbreathing hypersonic vehicle can not be designed as an independent component. Design process of scramjet must consider effects on whole hypersonic vehicle integrated performance. In our previous research work (IAC-05-C4.5.07), effects of scramjet operation on hypersonic vehicle trim moment had been analyzed and an optimization model was constructed to determine scramjet flowpath considering propulsion performance and trim moment of vehicle. Further work has been undertaken to investigate effects of scramjet flowpath design on hypersonic vehicle integrated performance. Hypersonic vehicle design is a multidisciplinary design problem in nature and must use multidisciplinary design optimization (MDO) method to solve disciplinary coupling problem and to reach a design result of operational hypersonic vehicle. A MDO design process has been constructed, including vehicle geometry configuration design module, aerodynamics analysis module, scramjet design and analysis module, aeroheating analysis module, mass properties module, stability/control module and relation of transfer data between these modules with each other. In the current research stage, this design process can generate design result that satisfies the requirement of the thrust/drag balance and the lift/weight balance under the condition of cruise flight state. Influences of scramjet flowpath change on other disciplinary performance evaluation value were investigated, such as vehicle aerodynamics, stability performance and mass properties. Results show scramjet flowpath design play a key role in the multidisciplinary design process of engine and airframe integrated hypersonic vehicle. Scramjet flowpath can be regarded as the base and first step of generating geometry configuration of hypersonic vehicle. Accordingly, MDO design process of hypersonic vehicle can be constructed by the scramjet optimization design as center and other disciplinary performance requirements as design constrains.
- Abstract document