The ignition process is the initial stage of internal ballistics,but due to the complexity of the ignition process and the imperfect ignition mechanism,the ignition process can never be organically combined with internal ballistics,and the current engineering internal-ballistics calculation can only ignore the ignition process and directly select the ignition pressure as the initial calculation point. Based on the zero-dimensional internal-ballistics theory,a simplified theoretical model of three stages of the ignition process,namely duration of time lag,flame-spreading interval and chamber-filling interval,was established. It can be organically combined with the zero-dimensional internal-ballistics,thus completing the whole process of internal-ballistics calculation from the ambient pressure ( not the ignition pressure ) . Through example calculation and verification,this model can well demonstrate the process of establishing chamber pressure during the ignition stage,and can calculate ignition parameters such as ignition delay time,flame-spreading time,and ignition powder flow rate. It has high predictive accuracy and meets the requirements of engineering calculations. Research shows that the established theoretical model of ignition process,like traditional zero-dimensional internal ballistics,has the engineering application characteristics of simple and fast calculation,and good accuracy. The method has important practical application significance to perfect internal-ballistics theory,and to improve prediction accuracy of internal ballistics of solid rocket motor. Due to the use of a simplified ignition-process theoretical-model,this study cannot be directly applied to the study of ignition performance,but can only be used for the prediction and calculation of zero-dimensional internal-ballistics performance.
internal ballisticssolid rocket enginesolid propellantignition processignition delay time
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