Research On Detonation Pressure Measurement Technology Of Booster Based On PDV Technology

In the explosive sequence of fuzes and pyrotechnics of various weapons and ammunition systems,the transmutation agent plays the role of energy transfers and amplification of the front and back.The research of the transfer agent is mainly concentrated on the weapons industry,military technology,fuel chemicals,power engineering and other fields,and plays an important role in the development of rockets and missiles.To make full use of a certain transfer explosive,the need for accurate measurement of its detonation parameters,the most important parameters are the detonation speed and detonation pressure,the existing technology can directly measure the detonation speed,but for the measurement of detonation pressure,usually derived by indirect projection,therefore,the study of direct measurement of detonation pressure technology is particularly important.Photon Doppler velocimetry(PDV)is feasible as a direct method of measuring detonation pressure in line with the current technological outlook.This thesis concentrates on the study of the technique of measuring pressure by PDV laser interferometer for explosive transfer charges.Firstly,a theoretical study was conducted for the detonation pressure under the classical explosive mechanics model,and the properties of the Van Neumann peak(VN peak)and the Chapman Jouguet point(CJ point)were explored.The impedance matching relationship was introduced into the mathematical model of detonation pressure measurement,and the mathematical relationship between the particle velocities at the explosive/window interface was established by combining the PDV laser interferometric velocimetry method.Based on this,a PDV-based detonation pressure measurement scheme is constructed and the corresponding structure of the detonation measurement device is designed,which provides a practical technical means for the field of detonation parameter measurement.Secondly,a simulation model for detonation pressure measurement was established using the AUTODYN simulation software.The finite element modeling approach and the Smoothed Particle Hydrodynamics(SPH)method were employed to perform detonation pressure output simulations for four commonly used monopropellants.The simulations separately captured the variation of detonation pressure at the shock wave front and the particle velocity changes at the interface.The simulation results were compared with experimental data from the literature.The results indicated that conducting simulation experiments using the SPH method yielded data consistent with those provided by general researchers and accurately simulated real detonation scenarios.This provides an important reference for precise measurement of detonation pressure.Therefore,utilizing the SPH method for simulation experiments can more accurately replicate real detonation scenarios and holds both theoretical and practical value.Finally,a software program for detonation pressure calculation was designed and developed using the Python programming language.It successfully completed the PDV-based experimental measurements of detonation pressure and validated the experimental results.The software features a visual and interactive interface,allowing input of particle velocity results to obtain corresponding VN peak pressure and CJ detonation pressure.By comparing the results with simulation data,it was determined that the introduced error by the software is less than 6%.Additionally,PDV laser interferometry experimental tests were conducted on a HNS-IV transfer explosive.Through the software calculations,the VN peak pressure was determined to be19.91 GPa,and the CJ detonation pressure was 12.63 GPa,which falls within the typical range reported by researchers.The experimental values were compared to the simulation results,with an error of less than 10%.In summary,this thesis investigated the measurement technique of detonation pressure for detonating explosives,covering four aspects: establishment of mathematical models,simulation experiments,development of detonation pressure analysis software,and design of detonation experiments.The research findings demonstrate the feasibility of the proposed measurement approach for detonating explosives.The established simulation model effectively simulates the detonation process and the dynamic changes of various parameters.Furthermore,the developed detonation pressure analysis software accurately calculates the detonation pressure values,enhancing the engineering measurement of explosive detonation parameters.