Adaptation of a Technique for Predicting Large Solid Rocket Motor Specific Impulse from Data Obtained in Micromotors


Book Description

A technique developed by the Rohm and Haas Company for specific impulse scaling has been adapted for use at the Air Force Rocket Propulsion Laboratory. The purpose of this technique is to predict specific impulse in large solid rocket motors based on data obtained in micromotors. As little as 2 pounds of propellant are required to obtain the data from which the prediction is made. The technique has been checked with a composite-modified-double-base propellant and a polybutadiene composite propellant. Within the limitations described, this technique can provide useful information concerning performance of a propellant in a large solid motor. Predictions, based on data obtained in micromotors, were within 0.6% of the delivered impulse in 6-pound motors and 70-pound BATES motors. (Author).




Study on Algorithms for Prediction of Solid Propellant Rocket Motor Performance


Book Description

This article introduces two predictive algorithms for the performance of solid propellant rocket motor. The emphasis is on the introduction of Time-Space Algorithm. The authors proposed a general two-dimensional grain calculation procedure in order to conduct the grain calculations. Therefore, the predictive algorithms for performance introduced by this article show generality. A comprehensive computer program for the aforementioned method has been written and applied to calculating the performance of three different solid rocket motors. The calculated results are consistent with those derived from experimental data.










Chemical Rockets


Book Description

The purpose of this book is to discuss, at the graduate level, the methods of performance prediction for chemical rocket propulsion. A pedagogical presentation of such methods has been unavailable thus far and this text, based upon lectures, fills this gap. The first part contains the energy-minimization to calculate the propellant-combustion composition and the subsequent computation of rocket performance. While incremental analysis is for high performance solid motors, equilibrium-pressure analysis is for low performance ones. Both are detailed in the book's second part for the prediction of ignition and tail-off transients, and equilibrium operation. Computer codes, adopting the incremental analysis along with erosive burning effect, are included. The material is encouraged to be used and presented at lectures. Senior undergraduate and graduate students in universities, as well as practicing engineers and scientists in rocket industries, form the readership.




A Computer Program for the Prediction of Solid Propellant Rocket Motor Performance


Book Description

A flexible, modular, fully automated, solid rocket motor performance prediction program has been developed. The program, which has been given the acronym SPP is based on six pre-existing computer codes. These codes have been integrated and modified, as required. To supplement the theory, where necessary, and to increase the flexibility of the program, a number of existing and newly developed semi-empirical correlations were incorporated into the program. The program has a general three-dimensional grain design capability, coupled to a one-dimensional ballistics analysis. The deviations from ideal performance are computed as a series of independent efficiencies.