Experimental Validation of Composite Solid Propellant Burning Rate Prediction Model (He-Qu-1D) using Ultrasonic Burning Rate (UBR)

Mujeeb, Shaik and Karri, Badarinath (2019) Experimental Validation of Composite Solid Propellant Burning Rate Prediction Model (He-Qu-1D) using Ultrasonic Burning Rate (UBR). Masters thesis, Indian institute of technology Hyderabad.

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Abstract

A valid predictive tool of ballistic behaviour of composite solid propellant gives more advantage for a designer of solid propellant to freeze a composition for a particular application. Composite solid propellant in ISRO is composed of major fraction of ammonium perchlorate (AP) as oxidizer and hydroxyl terminated polybutadine (HTPB) as the fuel-cum-binder. In this work, attempt has been made to validate one of the latest burning rate prediction models: heterogeneous quasi one dimensional model (He-Qu-1D) developed at IIT, Madras utilizing ISRO compositions of solid propellant. Thus this model can be used for the new compositions development in ISRO, and invariably reducing the trails for the optimization of the composition. Composite solid propellant combustion is determined by the diffusion and premixing of decomposition products of AP and HTPB binder where the binder is surrounded around the AP particle. Hence, the particle size distribution of AP is very crucial information for solid propellant combustion modelling. In view of this, different techniques of particle size distribution viz., sieve analysis, laser scatter dry method, laser scatter wet method, image analysis has been explored and studied in detail to determine the best method for repeated measurement. Based on this standardized method of measurement, particle size distribution information of AP, is measured and is fed to the above said He-Qu-1D model and predictions were made for six compositions of propellants. The results thus obtained were compared with the ultrasonic burning rates (UBR) results measured experimentally. Details of these results are discussed in this report. It is observed that there is a good agreement between the prediction and experimental results of major compositions.

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