290 results about "Shear flow" patented technology

A suppressor for rapid fire weapons designed to rapidly bleed down the weapon pressure and thereby minimizing gas blowback to the operator and to the weapon's gas operating system; while also creating a shear gas flow about the exiting bullet's gas flow to mask the flash thereof. The suppressor is configured within a generally cylindrical housing, having: (1) a central core of unported K-baffles located about a central bulletway; (2) a bypass located between the cylindrical housing and the unported K-baffled central core—providing a generally forward subsonic high gas flow area to an endcap closing the cylindrical housing; (3) said endcap having a series of vent ports for the bypass, which also create a shear flow about the centrally exiting bullet; and (4) wherein the series of unported K-baffles are spaced away from the weapon's bore end to allow the propellant gasses to expand into the bypass.

This invention includes a method of producing a thin, oriented layer of polymer material. The material is preferably produced by the method of introducing a shearing flow to a free surface in a predominantly monomeric solution of the self-assembling polymer sub-units, and inducing polymerization or growth of the monomer while in this shearing flow. The system for forming the oriented layer of material provides relative movement between a delivery system and the substrate on or over which the material is deposited. The rate of flow of the material from the delivery system and the relative velocity between the deposition surface and the material as it is delivered to the surface are controlled to properly orient the material at the desired thickness. These rates can be adjusted to vary the properties of the film in a controlled manner. Preferred embodiments include either angular or linear relative movement between the delivery system and the substrate.

Embodiments of the invention include compositions comprising a polymer an amount of nanotubes extrusion compounded together. The amount of the nanotubes dispersed in the polymer forms a composition with a storage modulus G′ that does not increase further extrusion compounding of the composition. Extrusion compounded compositions of conductive nanotubes and polymer can be molded into electrically dissipative articles whose resistivity decreases with decreasing shear flow in the molding process.

An optical sensor device for local analysis of a combustion process in a combustor of a thermal power plant, in particular a gas turbine plant, includes at least one wavelength selective optical element exposed directly or indirectly to hot combustion gases being produced by said combustion process, the optical element including an array of nano- and/or microcrystalline fibres which are created by shear flow crystallization.

The invention discloses a continuous steel casting process with a function of electromagnetic excitation compound mechanical stirring. According to the process, when alloy melt solidifies, microscopic and macroscopic strong shear flows are generated to break dendritic crystal by the electromagnetic excitation compound mechanical stirring technology, and accordingly, solidification structure refinement, full-equiaxed crystallization and solute segregation reduction are achieved, and alloy properties are improved. The invention further provides a continuous steel casting device mainly comprising a crystallizer, a rotor stirring paddle, a wheel, a program control motor, a magnetic field generator, a coil, and a voltage-regulating frequency-modulating alternating current source. The microscopic flows generated by electromagnetic excitation and macroscopic flows generated by mechanical stirring form complex chaotic flows which form strong shear flows to brake the dendritic crystal, crystal nucleus proliferation is prompted, temperature gradient is reduced, and ultrafine full-equiaxed crystal structure is achieved; meanwhile, segregation of alloy elements is significantly reduced or completely suppressed. The continuous steel casting process and method has the advantages that the energy consumption is significantly lower than that of conventional electromagnetic stirring and energy conservation is significantly effective.

The invention relates to a vortex-induced vibration test device for a stand pipe under the bidirectional shear flow and the bidirectional ladder shear flow, and belongs to the technical field of marine engineering. The vortex-induced vibration test device comprises a stand pipe model mechanism, a measurement and analysis system platform module, a drive module, a top cantilever module, a cylinder shaft segmentation module and a bottom supporting module, wherein the fixed end of the stand pipe model mechanism is suspended and fixed below the top cantilever module; the cylinder shaft segmentation module is perpendicularly placed in a marine engineering deep pool and is respectively and perpendicularly connected with the bottom supporting module, the drive module and the top cantilever module; the bottom supporting module is fixedly arranged on the lifting bottom of the marine engineering deep pool; the drive module is respectively connected with the cylinder shaft segmentation module and the top cantilever module and is used for outputting power; the left end and the right end of the top cantilever module are respectively connected with the cylinder shaft segmentation module; and the measurement and analysis system platform module is respectively connected with the stand pipe model, the top cantilever module and the bottom cantilever module. The vortex-induced vibration test device is convenient to install, update and change, and meets different functional requirements.

The invention provides a vortex-induced vibration rotary test device for an oblique riser with movable top under shear flow. The test device comprises a deep sea riser module, a top support module, a bottom support module, two vertical track modules, a horizontal track module, four motor modules, four fairing modules and a measurement analysis control module, wherein the two vertical track modules are connected with the bottom of the horizontal track module, the top support module and the bottom support module respectively; the horizontal track module is connected with the tops of the two vertical track modules; the two ends of the deep sea riser module are connected with the top support module and the bottom support module respectively; and the measurement analysis control module is connected with the deep sea riser module, the top support module and the bottom support module. According to the test device, vortex-induced vibration of a large-sized riser model under the influence of asea platform can be simulated by fully utilizing the vertical track modules and the horizontal track module; and the test device is very convenient to install and detach.

An airfoil includes a plasma actuation surface integrated onto the airfoil surface. On the airfoil, the plasma actuation surface is configured to provide high-frequency plasma actuation along the plasma actuation surface such that excitation of the vortex flow or shear flow mitigates the vortex flow or the shear flow associated with the airfoil.

The invention provides a sewage filter, which synthesizes a shallow tank theory, a dynamic coagulation theory, an accelerated coagulation theory and an inclined plate technology, effectively solves the problem of easiness in blockage of the traditional inclined plate. The sewage filter is used for subdividing raw motion water through by using filter masks and a plurality of through hole structures; and the raw water forms stable eddies at rear edges of plate holes of filter mask bodies. Under the entrainment action of the eddies, non-fluidic substances in the raw water are collected at centers of the eddies and get in continuous contact and collision with one another in eddy cores to undergo a flocculation reaction, and slides down along the mask bodies under the gravity action to settle into a mud collecting hopper, so that the purposes of removing suspended substances in the raw water and cleaning a water body are achieved. The sewage filter can rotate around an axis of a rotating shaft; and a strongly turbulent shear flow is formed through left and right repeated quick rotation to scour an inclined plate at a high speed and to clean deposits and blockages very conveniently.

The invention belongs to the technical field related to cutting force prediction in a metal machining process, and discloses a cutting force prediction method considering tooth spacing angles, helical angles and eccentricity of a cutter. The method comprises the following steps: (1) determining physical parameters of a workpiece, geometrical parameters of the cutter and machining parameters of a process; (2) dividing the cutting area of the cutter into multiple sections of cutting micro-units, and calculating cutter angle positions of the cutting micro-units at any moment, wherein the cutter operates in the cutting area; (3) calculating actual each tooth feed and instantaneous dynamic cut thickness of the cutting micro-units; (4) calculating shear flow stress, a shear force coefficient and a cutting edge force coefficient; (5) calculating cutting micro-unit force of the cutting micro-units in the tangential, radial and axial directions of the cutter, and transforming the micro-unit force to the X, Y and Z axes of a machine tool coordinate system via a Cartesian coordinate system; and (6) summing integrals of all the cutting micro-unit force achieving a cutting effect on each cutting edge to obtain three-dimensional dynamic cutting force at any moment.

The invention provides a vortex induced vibration rotation testing device of an inclined vertical pipe with a movable top end under a step shear flow, belongs to the technical field of marine engineering. The vortex induced vibration rotation testing device comprises a vertical pipe model mechanism, a measurement analysis system platform module, a driving module, a top cantilever module, a cylinder shaft section module, a bottom vertical pipe fixing module, a bottom supporting module and an oscillation module; the vertical pipe model mechanism is fixed between the oscillation module and the bottom vertical pipe fixing module, the oscillation module is fixed on the top cantilever module, the driving module is respectively connected with the cylinder shaft section module and the top cantilever module, the left and right ends of the top cantilever module are respectively connected with the cylinder shaft section module, the measurement analysis system platform module is respectively connected with the vertical pipe model, the top cantilever module, the oscillation module and the bottom vertical pipe fixing module. The testing device provided by the invention can simulate the verticalpipe step shear flow field and vertical pipe top platform movement in an actual size.

The invention discloses a long chain branching polylactic resin and a preparation method thereof. In the long chain branching polylactic resin, constitutional repeating units of a main chain and branch chains are lactic acid, wherein branch points on the main chain are tertiary carbon atoms in the lactic acid constitutional repeating units of the main chain. The preparation method comprises the steps of uniformly mixing a solution-mixed aid and a linear polylactic resin, and forming a long chain branching structure through internal melt mixing or double-screw reaction extrusion. The branch chain molecular weight Mb is larger than the entanglement molecular weight Me, the molecular weight is obviously improved, low-frequency end storage modulus G' and zero shear viscosity eta 0 are obviously improved during shear flow, the gel content is less than 1 percent, obvious strain hardening characteristic is shown during extensional flow, the requirement for secondary forming processing is met, and the tensile strength is obviously improved to 64MPa. The resin can be applied to the fields such as foaming, melt spinning and the like, and can be expansively applied to the fields such as foam packaging materials and clothing fibers.

The invention relates to a high-wear-resisting high-strength ultra-high molecular weight polyvinyl artificial articular material and a preparation method thereof. The high wear-resisting high-strength ultra-high molecular weight polyvinyl artificial articular material is prepared by melt blending and injection moulding of ultra-high molecular weight polyethylene (UHMWPE) and ultra-low molecular weight polyethylene (ULMWPE). The preparation method comprises the following steps of 1 irradiation-crosslinking UHMWPE preparation; 2 crosslinking UHMWPE/ULMWPE blend preparation; 3 vibrating-shearing injection moulding. According to the high-wear-resisting high-strength ultra-high molecular weight polyvinyl artificial articular material and the preparation method thereof, the wear-resisting performance of the UHMWPE is improved greatly by using the irradiation crosslinking technology, the melt viscosity of the crosslinking UHMWPE is reduced greatly by adding minute quantity of ULMWPE, and the melt machinability of the crosslinking UHMWPE is guaranteed; in the pressure maintaining stage of injection moulding, shearing flow field is introduced, a large number of reinforcing orientation lamella structures are induced to be generated, the mechanical performance of the material is improved greatly, residual free radical caused by irradiation in the UHMWPE is removed effectively, the oxidation stability of the material is improved, and the material is suitable for be used as boundary friction material of an artificial joint and is especially suitable for total knee prosthesis with higher demand of mechanical performance.

This invention relates to a method for the mechanically protective production of finely dispersed micro-/nanoemulsions with narrow droplet size distribution, whereby drops are produced on the surface of a membrane or of a filter fabric, and the drops are detached from the membrane or filter fabric surface by motion of the membrane or of the filter fabric in a first immiscible liquid phase in which pronounced stretching flow components in particular, besides shear flow components, bring about the detachment of the drops formed on the membrane surface especially efficiently and protectively. The invention also relates to a device for implementing the method according to the invention with a membrane or filter unit that is positioned to move, in particular to be able to rotate, in a housing with a gap that may be eccentric toward the inner wall of the housing and/or provided with flow baffles that produce stretching flow components.