A mixed charge structure is composed of several different types particles to achieve performance indicators that cannot be achieved by a single particle and usually need adjusted evaluated determine the parameters in chamber according demand. To balance accuracy efficiency, obtain more calculation parameters, solid phase modeled element method, while fluid computational dynamics solver based on fifth-order weighted essentially non-oscillatory scheme. In granular propellant, areas are...

Large-particle porous propellant has good surface-enhancing combustion performance and may improve the muzzle velocity of propulsion system effectively. The proposed particle element method is further refined to investigate motion characteristics flow field distribution in a large-particle charge with moving boundary. parameter aggregation established describe system, controlled by equations during propulsion, so that stretched coupled gas phase. accurately describes movement process...

Reducing the calculation cost is of great importance as demand for interior ballistic increasing. The key factor simulation quest to develop a more efficient method. In this paper, an two-dimension particle element method (PEM) proposed simulate detailed multidimensional flow gas and propellant in chamber. Firstly, several real particles are packed reduce solid phase. particular, matrix established describe distribution parameters. Secondly, boundary adjusted according particle's movement...

Different charge structures have different interior ballistic performance. Existing research is based on experimental measurements or the lumped parameter method to obtain limited characteristics, which indirectly impacts analysis of parameters’ distribution, requiring a complex modeling solution process. Besides this, ignition performance needs be further explored. The disadvantages previous studies feasibility optimization composite structure. In this paper, we apply two-dimensional...

To study the influence of flame-spreading behaviour in ignition process different charging structures high-density charge chambers, a visualisation device was designed, and two researched. The observed by high-speed digital camera system pressure data recorded acquisition instrument. According to experiment, two-dimensional axisymmetric internal ballistic two-phase flow model established simulate gas particle bed based on Weighted Essentially Non-Oscillatory (WENO) Scheme. results show that...

In order to describe the movement characteristics of large-particle high-density charge and development process flow field flame spreading in chamber, a new modified simplified particle element model was established based on Eulerian-Lagrangian approach, gas governing equations are discretized with fifth-order WENO scheme. The experiment carried out visualized platform, relevant data were recorded by acquisition instrument high-speed photography system. results show that numerical simulation...

To clarify the combustion process of a modular charge system with primer gap, rules governing cartridge movement and pressure change in chamber are analyzed. Based on characteristics system, an axisymmetric two-phase flow model interior ballistics is established, monotonic upward-centered scheme for conservation laws adopted to calculate process. Compared experimental results, difference peak less than 5%, which indicates that mathematical reliable accurate. The results show that, during...

The coupling action of gas flow with propellant burning surface regression is the critical process in solid rocket motor (SRM), which has an important effect on unsteady combustion, erosive burning, dynamic combustion and pressure fluctuation propellants. immersed boundary method (IBM) used to deal field caused by regression, face offsetting (FOM) applied track surface. combination these two methods can realize simulation regression. In this paper, mathematical model for all boundaries are...

Modular charges can form different structures within the chamber, offering flexibility, versatility, and high efficiency, have therefore been widely used in large-diameter combustion propulsion systems. To effectively enhance performance of system through optimizing number modules charging methods, this study integrates two-phase flow particle element method to analyze variations combinations module numbers modes employs multiple evaluation methods. Based on experimental verification,...

The gas–solid flow state of the high-speed combustion system varies with propellant and movement projectile. In this paper, to accurately obtain motion characteristics field distribution in chamber, a mixed calculation model interior ballistic two-phase combined particle element method two-fluid was established. First, considering different states periods, used describe initial charging state, while calculate subsequent homogeneous flow. Next, coupling transformation two methods were...

The immersed boundary method (IBM) is currently utilized in the simulation of two-dimensional axisymmetric flow solid rocket motors. In this paper, IBM applied to three-dimensional fields, keeping grain surface fixed. Based on Cartesian grid, a Euler solver developed using finite difference method. All boundaries field are processed IBM, including slip walls, mass inlet, pressure outlet, and rotational periodic boundary. Specific implementation these conditions mesh generation process...

The theory of causal emergence based on effective information suggests that complex systems may exhibit a phenomenon called emergence, where the macro-dynamics demonstrate stronger effect than micro-dynamics. However, challenge in this is dependence method used to coarse-grain system. In letter, we propose novel notion dynamical reversibility and build coarse-graining independent that. We not only found an approximately asymptotic logarithmic relation between for measuring effect, but also...

The prediction of fracture time and crack development metal shell under the impact load is a very significant research direction in engineering. In this paper, coupling method used to solve dynamic expansion process center-blast tube with V-grooves pressure. A one-dimensional two-fluid model was utilized govern transient combustion. nonlinear mechanical behaviors were predicted based on finite element software ABAQUS, pressure structure coupled by applying user subroutine interface VUAMP...

The impulse thruster exhibits the advantages of simplistic structure and rapid response speed. It is often used for attitude adjustment orbit control aircraft space vehicle. In order to study internal ballistic variation law flow characteristics gunpowder gas, interior working process L-type was investigated by numerical simulation experimental verification. First, an test designed conducted, change thrust pressure over time measured, feasibility rationality design were verified. Second, a...

Due to the orderly arrangement of tubular propellant, permeability combustion gases is improved, which beneficial for enhancing safety system. However, current internal ballistic gas-solid flow calculation methods adopt a quasi-fluid assumption, cannot accurately account characteristics long tube shapes. Additionally, propellants exhibit both overall movement and parameter distribution characteristics, necessitating decoupling gas solid phases. These two deficiencies in previous studies have...

Predicting company growth is crucial for strategic adjustment, operational decision-making, risk assessment, and loan eligibility reviews. Traditional models often focus too much on theory, overlooking practical forecasting, or they rely solely time series forecasting techniques, ignoring interpretability the inherent mechanisms of growth. In this paper, we propose a machine learning-based prediction framework that incorporates an econophysics model Our captures both intrinsic companies led...