6 results about "Mass flux" patented technology

The invention discloses an aerodynamic thermal analysis method, device and equipment under multiple conditions and a medium, and relates to the technical field of aerodynamics, and the method comprises the steps: obtaining a target high-temperature gas flow field of an aircraft, and extracting wall surface parameter information and wall surface sub-layer parameter information; calculating the inflow and outflow mass flux of each component in a control body, determining condition parameters of each wall surface effect condition, and obtaining a component mass conservation equation; constructing a wall surface total mass conservation equation based on the mass flux, the component diffusion conservation condition and the catalytic conservation condition of each component; constructing a wall surface energy conservation equation based on the total mass ejection flux, the wall surface parameter information and the wall surface secondary layer parameter information determined by the wall surface total mass conservation equation; performing mathematical operation on the component mass conservation equation, the wall surface total mass conservation equation and the wall surface energy conservation equation to obtain a wall surface heat flow calculation equation; and substituting the current wall surface condition into the wall surface heat flow calculation equation to obtain an aerodynamic heat analysis result, and realizing accurate aerodynamic heat analysis under different working conditions.

This invention discloses a method for calculating the water droplet collection coefficient of a rotationally axisymmetric surface. The method includes: establishing a geometric model of a two-dimensional cross-section of the rotationally axisymmetric surface and meshing it; selecting a two-dimensional axisymmetric computational fluid dynamics model and solving for the two-dimensional axisymmetric airflow field; correcting the airflow field; establishing the force-motion equations for water droplets within a Lagrangian framework; releasing water droplets at equal intervals in the radial direction at a far-field location away from the surface; solving the motion equations for each water droplet; adding the mass flux of water droplets impacting surface micro-elements to the cumulative mass flux of that impacted micro-element; traversing the surface micro-elements and obtaining the water droplet collection coefficient of the rotationally axisymmetric surface based on the ratio of the cumulative mass flux to the theoretically maximum possible mass flux of water droplets collected by that micro-element. This method uses a two-dimensional axisymmetric approach to calculate the airflow field and water droplet collection coefficient of a rotationally axisymmetric surface, significantly reducing the number of meshes and improving computational efficiency.

The present application discloses an aerodynamic thermal analysis method, device, equipment and medium under multiple conditions, which relates to the field of aerodynamic technology, including: obtaining a target high-temperature gas flow field of an aircraft, extracting wall parameter information and wall sub-layer parameter information; calculating the mass flux of each component flowing in and out of a control body, determining the conditional parameters of each wall effect condition, and obtaining a component mass conservation equation; constructing a total wall mass conservation equation based on the mass flux of each component, the component diffusion conservation condition and the catalytic conservation condition; constructing a wall energy conservation equation based on the total mass ejection flux determined by the total wall mass conservation equation, the wall parameter information and the wall sub-layer parameter information; performing mathematical operations on the component mass conservation equation, the wall total mass conservation equation and the wall energy conservation equation to obtain a wall heat flux calculation equation; substituting the current wall condition into the wall heat flux calculation equation to obtain an aerodynamic thermal analysis result, and realizing accurate aerodynamic thermal analysis under different working conditions.

The invention discloses a gas-liquid-ice three-phase flow analysis method, device and equipment and a medium, and relates to the field of phase analysis, and the method comprises the steps: in a computational domain determined based on industrial equipment, determining a velocity vector of a fluid at a boundary in the computational domain based on a current liquid-ice phase function, so as to update the current velocity vector of the fluid; inputting the current gas-liquid phase function, the current mass flux and the updated current velocity vector of the fluid into a coupling relational expression to update the current vortex vector and the current velocity vector of the fluid and predict a new current gas-liquid phase function, and then updating the current temperature of the fluid in combination with the current liquid ice phase function and the current mass flux. And the current mass flux, the current liquid ice phase function and the current gas-liquid phase function are updated based on the updated current temperature, so that the phase state at any position in the computational domain is determined in real time, autonomous analysis of the dynamic icing process is realized, the blank in the field of gas-liquid ice three-phase flow analysis is filled up, and support is provided for icing problem analysis.

This invention relates to the field of DCMD module desalination performance testing, specifically a method for analyzing the desalination performance of a seawater desalination system based on engine waste heat recovery. This invention constructs a closed-loop thermal-mass-phase change model driven by engine waste heat and centered on the membrane interface for steady-state analysis of the seawater desalination process; it also comprehensively considers the coupling relationships between multiple parameters. These parameters collectively affect vapor pressure and heat transfer processes, thereby enabling the testing and analysis of the desalination performance of the seawater desalination system. By introducing the Knudsen number of the permeate membrane as a criterion, the microscopic mechanism of water vapor diffusion during membrane distillation is correlated with macroscopic performance testing. Based on the identification of diffusion types, the corresponding physical model is selected to calculate the mass transfer coefficient, improving the accuracy of mass flux and subsequent desalination rate calculations. This allows for real-time testing of the desalination performance of the DCMD module in the seawater desalination system with high accuracy.

The invention discloses a two-phase delayed solute transport simulation method based on near-field dynamics, and the method comprises the steps: dividing a region in a solid model, setting an initial substance point, and selecting a central substance point and an affiliated substance point in a neighborhood of the central substance point by taking a preset size as a radius; calculating mass flux transmission quantity among material points according to the local convection function and the local diffusion function, and constructing a diffusion-convection constitutive function; inputting a flux delay factor and a storage delay factor into the constitutive function to form a biphase delay migration integral-differential equation; and solving the equation to obtain a solute transport simulation result. According to the method, long-range interaction of solute particles is described in a non-local integral form, the method has remarkable advantages in depicting solute migration delay behaviors, interface reaction kinetics and the like in layered soil, anisotropic soil bodies and fissure media, and solute non-Fick migration behavior delay characteristics can be accurately predicted; and a novel theoretical tool is provided for solute migration analysis under complex geological conditions.