Author: C. J. SteffenPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Fuel Injector Design Optimization for an Annular SCRAMjet Geometry
Author: C. J. SteffenFuel Injector Design Optimization for an Annular Scramjet Geometry
Author: Fuel Injector Design Optimization for an Annular Scramjet Geometry
Author: Christopher J. SteffenPublisher:
ISBN:
Category :
Languages : en
Pages : 15
Book Description
Fuel Injector Design Optimization For An Annular Scramjet Geometry... NASA/TM-2003-212094... National Aeronautics And Space Administration... January 2003
Author: Multi-objective Design Optimization of a Variable Geometry Spray Fuel Injector
Author: John Richard ArcherA Variable-Complexity Modeling Approach to Scramjet Fuel Injection Array Design Optimization
Author: Michael D. PaynePublisher:
ISBN: 9781423563266
Category : Airplanes
Languages : en
Pages : 91
Book Description
The analysis of fuel air mixing in a scramjet is often accomplished either with Computational Fluid Dynamics (CFD) algorithms or through experimental research. These approaches, while accurate and reliable, are extremely expensive and thus not well suited for use with conventional design optimization methods. In this investigation, Variable Complexity Modeling (VCM) is used to significantly reduce the number of complex, expensive analyses required to optimize the design of a scramjet fuel injection array. A design problem formulation for a lateral transverse injection array is developed and a VCM approach to design optimization is conducted in two stages. Initially, a simplified analysis model is used to provide relatively inexpensive predictions of design fuel air mixing characteristics. A parametric analysis is conducted to explore the design region, and a preliminary optimal design is found using both Sequential Quadratic Programming and a Genetic Algorithm. In the second stage, response surface methodology is supplemented with preliminary stage information to minimize the number of expensive analyses required to finalize the design. It is shown that only 25 design evaluations are required to develop a near optimal design.
41st AIAA Aerospace Sciences Meeting & Exhibit
Author: Coupling Computational Fluid Dynamics Analysis and Optimization Techniques for Scramjet Engine Design
Author: Nathan T. McGillivrayPublisher:
ISBN:
Category : Aerospace engineering
Languages : en
Pages : 67
Book Description
Various aspects of hypersonic vehicles are being rapidly explored for improved functionality. One of the main areas of consideration is the fueling of a Supersonic Combusting Ramjet (scramjet) engine. Using Computational Fluid Dynamics (CFD), computer simulations can be performed to analyze the flow physics of a scramjet. In this research, an optimization code, Dakota, is integrated with the CFD to optimize a set of parameters to maximum thrust. In this study, the fuel injection and combustion is replaced with heat sources. This simplification greatly reduces the computational requirements. Additionally, the 3D geometry is reduced to an axisymmetric 2D geometry because three dimension effects like mixing and combustion are not being modeled. With this simplified model, the optimization and CFD algorithm is executed to find the heat addition for maximum thrust. Different optimization methods have been explored to reduce computational times. A genetic algorithm was selected because of its robust abilities. Additionally, a sampling algorithm was selected because of its abilities to explore the whole design space. Furthermore, the sampling method enables additional studies, such as sensitivity studies, to be completed. In addition to optimization studies, calibration studies are performed to obtain the heat source values that correspond to a given experimental wall pressure distribution. Knowledge of the optimized heat distribution will assist in the optimization of fueling splits and injector locations for a more detailed combustion investigation in which similar optimization techniques can be applied.
Author: 
Author: