14 results about "Incompressible flow" patented technology

The present invention discloses a valve assembly comprising a seat ring, a valve plate assembly movable between a sealed position within the seat ring and an open position outside the seat ring. A fitting can pass through the valve plate, and / or a sensor assembly can extend through the fitting with a sensor mounted below the valve plate assembly. The sensor assembly provides enhanced monitoring capabilities by being positioned in the incompressible fluid column below the valve plate assembly, ensuring accurate sensing of relevant parameters. This configuration allows for efficient and reliable operation of the valve assembly, enhancing its performance and functionality in various applications.

A landing gear assembly for rotorcraft includes a shock absorber, a ground support assembly and an airframe linkage assembly. The shock absorber includes a force sensor to detect a pressure of an incompressible fluid within the shock absorber and a temperature sensor to detect a temperature of the fluid. The ground support assembly is linked to the shock absorber and includes an axle and a ground contact element movable in relation to the axle. The linkage assembly is linked to the shock absorber and / or the ground support assembly and includes a position sensor to detect movement of the axle between compressed and uncompressed conditions of the shock absorber. Various rotorcraft include one, two, three or more landing gear assemblies and an attitude control system. Various rotorcraft methods process sensor signals from one, two, three or more landing gear assemblies at the attitude control system to provide various rotorcraft functions.

The application discloses a kind of double box girder flow field dynamics modal and flow stability analysis method and system, belong to bridge engineering field.This method first establishes double box girder flow field model by computational fluid dynamics, solves the momentum equation and continuity equation of two-dimensional incompressible flow;Dynamic modal decomposition is carried out again, and eigenvalue, characteristic mode and other information are obtained;Finally, based on linear stability theory, the flow field component is expressed as the sum of steady-state solution and disturbance term, and the global linear flow stability equation is obtained by substituting into the equation, and the flow stability is analyzed by discrete.This method can accurately extract the modal characteristics of each order, providing a scientific basis for wind-induced vibration analysis of double box girder, and has important application value.The method of the application occupies less computing resources, has high numerical accuracy, and can be further expanded to higher precision calculation model according to computing resources, and is suitable for application in actual bridge engineering.

A downhole motor control system may identify a downhole compressible density of a drilling fluid using a downhole temperature and a downhole pressure of the drilling fluid, the drilling fluid including an incompressible portion and a compressible portion, the drilling fluid flowing downhole with a downhole compressible flow component and an incompressible flow component. A downhole motor control system may determine the downhole compressible flow component using the downhole compressible density, a surface compressible density of the compressible portion at a surface location, and a surface compressible flow component of the compressible portion at the surface location. A downhole motor control system may identify a downhole compressible fraction of the drilling fluid based on the downhole compressible flow component and the incompressible flow component. A downhole motor control system may generate a composite flow rate of the drilling fluid based on the incompressible flow component and the downhole compressible fraction.

The invention discloses an asynchronous GMRES precondition method for AI acceleration of a pressure Poisson equation in incompressible flow numerical calculation, and belongs to the field of computational fluid mechanics. Aiming at the calculation bottleneck of a traditional GMRES method when a pressure Poisson equation is solved, the method adopts an asynchronous parallel AI precondition framework, neural network training and flow field solving are decoupled, and concurrent execution is achieved. The solver thread performs real-time inference by using the current model, and provides high-quality initial guess; the weight is optimized in the background of the trainer thread, and the lagging is tolerated by using the flow field time coherence. Experimental results show that the method shortens the solving time by 67%-82% on the premise of ensuring convergence precision, and is suitable for large-scale fluid simulation.

Disclosed herein is a system for generating neutrons with thermal fusion, composition for use in the same, and method of using the same. The system comprises a crucible, the crucible having a quantum incompressible fluid and a gas bubble therein, a piston having an end submerged within the quantum incompressible fluid, and a controller coupled to the piston configured to drive the piston to generate an acoustic resonance in the quantum incompressible fluid.

A downhole power generation system (10) comprising a pressure chamber assembly (12) having a first movable element (14, 48, 49) which at least partially encloses a first variable volume chamber (V1A) and a second movable element (16, 48', 49') which at least partially encloses a second variable volume chamber (V1B), each movable element (14, 48, 49, 16, 48', 49') having an exterior surface and an interior surface, and the first and second variable volume chambers (V1A, V1B) being connected by a conduit (18) so that they together enclose a closed volume (V1) containing an incompressible fluid, the conduit (18) providing a path for flow of the incompressible fluid between the first variable volume chamber (V1A) and the second variable volume chamber (V1B) when the first and second movable elements (14, 48, 49, 16, 48', 49') move so that one of the first or second variable volume chamber (V1A, V1B) contracts and the other expands, the system further comprising a generator device (20) which is located in the conduit (18), and which is configured to use the flow of incompressible fluid along the conduit (18) to generate power.

The invention provides a propeller hydrodynamic force rapid estimation method, device, equipment and medium, and the method comprises the steps: adopting a plurality of curved surfaces which are coaxial with a propeller and have different radiuses, cutting a single blade profile of a three-dimensional geometric model of the propeller, and forming blade sections with different radiuses, obtaining a group of quasi two-dimensional curved surface calculation models; performing rapid grid division on each quasi-two-dimensional curved surface calculation area containing the propeller tangent plane, and setting a flow field boundary condition and a flow field initial condition for the divided calculation area; on the basis of set conditions, an incompressible flow pressure correction method is adopted for unsteady numerical calculation, and axial force and circumferential force borne by the curved surface airfoil profile in each divided calculation area under different working conditions are obtained through solving; based on different cross section positions and axial force and circumferential force on each cross section, total thrust and total torque borne by blades of the propeller thruster are calculated through radial integral approximation, so that the problems that mutual influence of flow fields in complex thruster design is difficult to evaluate, and efficiency and precision of a traditional method are unbalanced are solved.

The invention relates to a power support unit (100) for a movable flap (110), in particular for a vehicle flap, with at least one pivotally connected adjusting element (120), wherein the adjusting element (120) has a working chamber (130) filled with a fluid and at least one piston rod (140) which partially penetrates the working chamber (130) as well as a guide and sealing package (160) arranged at a first end (122) of the adjusting element (120) and sealing the adjusting element (120). According to the invention, the working chamber (130) is completely filled with an incompressible fluid and a spring chamber (180) is provided, which is sealed and separated from the working chamber (130) by means of a separating element (200) which is movable in the adjusting element (120), in which a spring element (190) is arranged to pressurize the separating element (200) in such a way that the piston rod (140) can be extended, wherein the spring element (190) is provided as a mechanical spring element and / or as a pressurized gas filling. The invention further relates to an adjustment device for a movable flap (110), in particular for a vehicle flap, with a power support unit (100) and a further adjustment element (330).

The application discloses a flexible cover layer for inhibiting underwater bubble jet load and a manufacturing method thereof, and comprises a flexible cover layer, a rubber outer layer and a closed-cell foam sandwich layer; the rubber outer layer and the closed-cell foam sandwich layer are pasted to form the flexible cover layer; the other side of the closed-cell foam sandwich layer is pasted to a cabin wall or a side plate of an underwater vehicle; the rubber outer layer supports and protects the closed-cell foam sandwich layer, and prevents the closed-cell foam sandwich layer from being torn under the action of explosion impact due to the thin single foam wall; the manufacturing method comprises the following steps: obtaining material parameters through experiments, obtaining explosion load information through a scaled-down experiment; presetting the thickness of each layer, coupling numerical solutions of compressible fluid models and incompressible fluid models with a finite element structure model, performing finite element numerical calculation, optimizing the structure thickness according to the finite element calculation result, and manufacturing the flexible cover layer according to the thickness. The application has the advantages of better absorbing shock wave energy generated by underwater explosion and inhibiting and blocking the impact of high-speed bubble jet load.

The present invention relates to a method for determining, at any point in a geographical area and at any time, the evolution in time and space of a concentration (Cp) of at least one pollutant emitted by a source (SE) and dispersed by the wind. In the present invention, the pollutants are considered to be transported by the wind, via the solution of an advection-diffusion equation, and the wind is characterized by Laplace flow (irrotational and incompressible flow), using a wind velocity potential model (WVPM). Furthermore, the present invention defines boundary conditions (BC) of the Stokes equations to account for complex obstacle geometries and non-uniform wind conditions within the wind velocity field model (WVPM). Figure 1 to be published

The present invention discloses a valve assembly comprising a seat ring, a valve plate assembly movable between a sealed position within the seat ring and an open position outside the seat ring. A fitting can pass through the valve plate, and / or a sensor assembly can extend through the fitting with a sensor mounted below the valve plate assembly. The sensor assembly provides enhanced monitoring capabilities by being positioned in the incompressible fluid column below the valve plate assembly, ensuring accurate sensing of relevant parameters. This configuration allows for efficient and reliable operation of the valve assembly, enhancing its performance and functionality in various applications.

The invention relates to the technical field of simulation experiments, in particular to a thermodynamic system simulation modeling method and system, electronic equipment and a storage medium, and the thermodynamic system simulation modeling method comprises the following steps: respectively establishing branch models for incompressible fluid and compressible fluid; establishing a node model based on the branch model; wherein nodes with the pressure of P in the node model are connected with m nodes or boundaries at the upstream through m branches, and are connected with n-m nodes or boundaries at the downstream through n-m branches; m and n are positive integers; calculating the pressure on each node in n nodes based on the node model; and calculating the flow on each branch based on the pressure on each node. According to the method, the simulation precision and the calculation efficiency of the thermodynamic system can be improved, and the equipment characteristics can be simulated more accurately, so that serious accidents and the like are analyzed and researched, the economic loss is avoided, and the usability is high.

The invention aims to provide a structure-keeping pressure correction projection numerical method for an incompressible Navier-Stokes equation, which is characterized in that a dynamic energy dissipation structure and an incompressible constraint structure of a continuous equation are kept on a discrete level by introducing nonlinear energy equivalent reconstruction and a grad-div stabilization mechanism on the basis of a rotary pressure correction projection framework. According to the method, the velocity field and the pressure field can be effectively decoupled in each time step, a nonlinear equation is converted into a plurality of constant coefficient linear sub-problems to be solved, and complete linearization and operator structure maintenance of the calculation process are achieved. According to the method, the physical consistency of flow simulation is kept, meanwhile, the numerical stability and the calculation efficiency are remarkably improved, the problems that in a traditional projection method, the time step length is limited, operators are difficult to assemble repeatedly, and energy deviation is accumulated are solved, and the method is suitable for stable numerical simulation of high-precision incompressible flow.