Reduced-Order Modeling of Turbulent Reacting Flows with Application to Ramjets and Scramjets

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/90621/1/AIAA-50272-117.pd

RevMexAA (Serie de Conferencias), 12, 38-38 (2002)

atios obtained earlier are used in this process. To calculate the T e and N e the user has to provide a line ratio 1 Facultad de Ciencias, UABC, Ensenada, Mexico. Instituto de Astronoma, UNAM, Ensenada, Mexico. Fig. 1. Screenshot of xAbIon. (from [O III] or [N II] to calculate the temperature and [S II] for density), the energy level transitions and an initial value for the N e or the T e , respectively. After obtaining the T e and N e , the ion abundances by number for each ion can be calculated. First, the ionic abundance ratio is estimated and recognized automatically by the system. Then, the ionic abundances by number can be calculated. This process is repeated until the ionic abundances for all the ions are computed. Both the rst and second phase write the results in a L A T E X formatted le. The le written by xGalRed contains a table with the ions, their wavelength, observed and dereddened uxes and the extinction law. xAbIon write its results in the correspondin

Numerical investigation of upstream fuel injection through porous media for scramjet engines via surrogate-assisted evolutionary algorithms

A multi-objective design optimization study has been conducted for upstream fuel injection through porous media applied to the first ramp of a two-dimensional scramjet intake. The optimization has been performed by coupling evolutionary algorithms assisted by surrogate modeling and computational fluid dynamics with respect to three design criteria, that is, the maximization of the absolute mixing quantity, total pressure saving, and fuel penetration. A distinct Pareto optimal front has been obtained, highlighting the counteracting behavior of the total pressure against the mixing efficiency and fuel penetration. The injector location and size have been identified as the key design parameters as a result of a sensitivity analysis, with negligible influence of the porous properties in the configurations and conditions considered in the present study. Flowfield visualization has revealed the underlying physics associated with the effects of these dominant parameters on the shock structure and intensity

Digital Data Processing Method for Shock Tube

We discuss a simple data acquisition system (DAQ) setup for high frequency pressure measurements in shock tube operations. The details of a new method to post-process the data using a scientific computing language to determine flow characteristics are described. The results give valuable insights into the time evolution of shocks and expansion waves in a shock tube process