Download or read book Contribution to Numerical Simulation Analysis of the Flow in the Ram Accelerator in the Subdetonative Propulsion Mode written by Tarek Bengherbia and published by . This book was released on 2009 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this work is to examine in details the flow field characteristics of the thermally choked ram accelerator using five step kinetic reaction mechanisms. The results from the simulations are compared with experimental values from representative experiments at the University of Washington 38-mm-bore facility. The data that were used for comparison with theory were derived from experiments performed in a 16-m-long tube with CH4/O2/N2 propellant mixtures at pressures on the order of several MPa. The data derived from these CFD calculations were used to implement a one-dimensional computer code which has been developed to predict the thrust in the thermally chocked combustion mode and is aimed at providing data over a wide range of initial pressures, where the steady state calculation is no longer valid and the real gas effects must be accounted for. This code includes both steady and unsteady state calculations, using several equations of state. The predicted thrust and velocity agree well with experimental values. The code, which requires simple data input and very low computer capabilities, provides an easy and rapid access to the prediction of the ram accelerator performance in the thermally choked combustion regime, over a wide range of mixture compositions and fill pressures.