Numerical Simulation On Dispersal Process Of Gasbag-style Cluster Bombs

Having the advantages of compact structure, son-bomb withstand acceleration relatively much small, easy to obtain controlled dispersal speed and son-bomb dispersal radius, gasbag-style cluster bombs dispersal way is a more application prospects of the invention dispersal way. This paper studies gasbag-style cluster bombs dispersal process that from ignition powder ignition to son-bomb gasbag completely separated, the main work done as follows:(1) Interior ballistics program compiled based on the theory of classical interior ballistic, calculated pressure changes of the gas projectiling mechanism and propellant gas flow change, and pressure calculation results with the experimental data are compared to verify the pressure to calculate the accuracy of the data and the calculation of the pressure input load data as cluster bombs to dispersal chapter;(2) Arbitrary Lagrangian-Eulerian(ALE) Method and Control Volume(CV) method are used to simulate the process of free expansion of the gasbag inflates, getting the flow field and pressure of the inside of the gasbag, and the volume and gasbag inflated height of the gasbag, and compared ALE method results with CV method, ALE method gasbag inflates state more in line with the actual physical process, but also to get the flow field and pressure of the inside of the gasbag, and other data, and better than the CV method by comparing;(3)Arbitrary Lagrangian-Eulerian(ALE) method and Control Volume (CV) method are used to simulate the process of gasbag-style cluster bombs dispersal process, getting son-bombs dispersal speed, acceleration, stroke, and gasbag internal pressure, the flow field and the gasbag volume, height and other data. Compared simulated son-bombs dispersal speed, acceleration, stroke with the test results, calculated dispersal speed and stroke with the experimental data are very close, but the dispersal acceleration and test relatively large difference; in addition, the gasbag shape changes calculated by comparing the two methods, get:under limited conditions, the ALE method calculation process gasbag shape appeared much more obvious asymmetry, this phenomenon almost does not appear to CV method, which little better than the CV method.