45 results about "Fluidic oscillator" patented technology

Microfluidic chips and microfluidic systems containing the same for implementing microfluidic oscillatory asymmetrical traps are described herein. In one example, an oscillatory microfluidic system for trapping particles contained in a fluid flowing within a channel is provided. The oscillatory microfluidic system including: the channel to conduct the fluid, where the channel includes a longitudinal axis and one or more geometric features that provide at least one asymmetry along the longitudinal axis; a source of pressure or flow to move the fluid through the channel; a fluid oscillator to provide an oscillating pressure on the fluid within the channel; and a controller arranged and configured to transmit control signals to the fluid oscillator to generate a repeating oscillation flow profile of the fluid within the channel, thereby trapping the particles in one or more zones centered on the one or more geometric features within the channel.

The invention discloses an alternate aeration venturi tube type micro-nano bubble generation device, which comprises a venturi jet device, a double-feedback channel fluid oscillator is communicated with the throat part of the venturi jet device, the top of the double-feedback channel fluid oscillator is an air inlet, and the bottom of the double-feedback channel fluid oscillator is a first outlet and a second outlet; a first annular porous material ring and a second annular porous material ring are installed at the positions, corresponding to a first outlet and a second outlet of the double-feedback-channel fluid oscillator, of the throat portion of the Venturi jet device respectively, the first outlet is communicated with the first annular porous material ring, and the second outlet is communicated with the second annular porous material ring. A flexible film is arranged in a divergent section of the Venturi jet device, and a rotational flow impeller is installed in a convergent section of the Venturi jet device. Interval ventilation can be achieved through the double-feedback-channel fluid oscillator, the double-feedback-channel fluid oscillator is combined with the annular porous material ring, and bubble gathering is restrained; meanwhile, under the synergistic effect of rotational flow shearing and film dynamic breaking, micro-nano bubbles are generated.

The invention provides a multi-feedback-channel fluid oscillator, and belongs to the technical field of fluid jetting devices. Comprising an oscillation cavity, an inlet, a nozzle and at least three feedback channels, the inlet is formed in one end of the oscillation cavity, the nozzle is formed in the other end of the oscillation cavity, the nozzle and the inlet are oppositely arranged along the central axis of the oscillation cavity, and the feedback channels are circumferentially distributed around the central axis of the oscillation cavity. And each feedback channel is provided with a feedback channel inlet and a feedback channel outlet. Through the configuration design of the multiple feedback channels, the fluid can form feedback control flow through the feedback channels, and the fluid entering the oscillation cavity through the inlet flows along the wall of the oscillation cavity in multiple directions and is switched through the coupling effect of the fluid coanda effect and multi-channel backflow feedback. And finally, multi-direction sweeping self-oscillation jet flow is formed at the nozzle, so that the space coverage range and the atomization efficiency of the jet flow are greatly improved.

The invention discloses a high-performance fluid oscillator based on a turbulent flow column structure. The high-performance fluid oscillator comprises an oscillator body, and the oscillator body is provided with a fluid oscillator inlet, an oscillator inlet channel, a mixing chamber, a mixing chamber inlet, a mixing chamber outlet, a feedback channel, a feedback channel inlet, a feedback channel outlet, an oscillator outlet channel, a fluid oscillator outlet and turbulent flow columns; the fluid oscillator inlet is communicated with the oscillator inlet channel; the oscillator inlet channel is communicated with the feedback channel outlet and the mixing chamber inlet; the mixing chamber inlet is communicated with the mixing chamber; the mixing chamber is communicated with the mixing chamber outlet, the feedback channel inlet and the oscillator outlet channel; and a unique turbulent flow column structure is arranged at the rear end of the oscillator outlet channel. The device does not need extra power, utilizes the Coendall effect, the backflow feedback effect and the Karman vortex street effect of the airflow to generate periodic large-amplitude up-and-down swinging airflow at an outlet of the device, and is simple in structure, small in size, large in jet flow deflection angle, convenient to operate, reliable in running and free of maintenance.

A sensor for determining the oscillating frequency in a fluidic oscillating nozzle and provides an oscillating nozzle, comprising a fluidic oscillator with inlet and outlet and a main channel and at least one control passage surrounding the main channel, and a splitter comprising at least two splitter channels which is attached to the outlet of the fluidic oscillator, wherein the sleeve of at least one of the at least two splitter channels comprises partially a flexible foil. The invention also relates to a method for monitoring a dispensed fluid jet, comprising the steps of providing an oscillating nozzle as described above; and injecting a fluid jet and in parallel determining the oscillation frequency by determining the deformation changes of the flexible foil.

The present invention discloses an S-shaped flow channel active flow control variable parameter testing system, comprising a curved section and straight sections connected at both ends of the curved section, wherein a replaceable plug-in plate is detachably installed on the curved section, and a mounting slot is provided on the replaceable plug-in plate at a position to be tested; a replaceable fluid oscillator is installed in the mounting slot, and the replaceable fluid oscillator is detachably connected to the mounting slot; the jet outlet of the replaceable fluid oscillator faces the flow channel inside the curved section; the system can realize the replacement of the position to be tested by replacing the replaceable plug-in plate and the mounting slots at different positions on the replaceable plug-in plate, and simultaneously realize the change of factors such as the jet angle, the number of actuators, and the spacing by replacing the replaceable fluid oscillator, so that the system can quickly and conveniently adjust various influencing parameters affecting the active flow control inside the S-shaped air inlet channel.

The invention discloses a gas compressor blade based on a distributed self-excitation adjustable fluid oscillator, and belongs to the technical field of aero-engines and gas turbines. Comprising a gas compressor blade body, a distributed self-excitation fluid oscillator and a parameter adjusting device based on piezoelectric ceramics. The multiple self-excitation fluid oscillators are arranged in the compressor blade body, each self-excitation fluid oscillator comprises a flow channel, an inlet hole, an outlet hole, a resonant cavity and a feedback channel, the resonant cavity communicates with the flow channel and the feedback channel, the outlet hole of the flow channel and an adjusting outlet of the resonant cavity are formed in the suction face, and the inlet hole of the resonant cavity is formed in the pressure face. Self-excitation is achieved through the pressure difference between the pressure surface and the suction surface of the blade, the flow of the resonant cavity is finely adjusted through the piezoelectric ceramic piece, the channel state and the outlet shape are fed back, the strong coupling limitation of the flow and the frequency of a traditional fluid oscillator is broken through, and autonomous control and three-in-one flexible and changeable control of different flows and frequencies of all outlets are achieved; the device has the advantages of simple structure, low energy consumption, high reliability and the like.

Various implementations include a fluidic oscillator having at least one control port. The at least one control port is for introducing a control fluid into the fluidic oscillator or suctioning the fluid stream from the fluidic oscillator. The introduction of a control fluid into the fluidic oscillator or suction of the fluid stream from the fluidic oscillator alters the frequency and sweeping angle of the oscillating fluid stream as it exits the fluidic oscillator. Various other implementations include a fluidic oscillator having a first control port defined by the first portion of the outlet nozzle and a second control port defined by the second portion of the outlet nozzle. The introduction of a control fluid into the fluidic oscillator or suction of the fluid stream from the fluidic oscillator through the control ports alters the exit angle of the oscillating fluid stream as it exits the fluidic oscillator.

The invention discloses an anti-blocking ejector and an ejection reactor, and relates to the technical field of ejectors, the anti-blocking ejector comprises an ejector body and a fluid oscillator arranged in the ejector body, and an oscillator inlet of the fluid oscillator is connected and communicated with a nozzle outlet of the ejector body; an oscillator outlet of the fluid oscillator faces the outlet of the injector body, and the fluid oscillator is capable of ejecting an oscillating jet. The ejector can be effectively prevented from being blocked, and the mass transfer efficiency in the reaction process is improved. An anti-blocking ejector adopted by the jet reactor serves as a jet component. The ejector can be effectively prevented from being blocked, and the mass transfer efficiency in the reaction process is improved.

The present invention provides an annular fluid oscillator nozzle combustion chamber, comprising an outer casing of a combustion chamber, a flame tube installed inside the outer casing of the combustion chamber, an annular oscillation generating device installed on the side of the flame tube, an inner casing of the combustion chamber installed inside the flame tube, an oil delivery device connected to the annular oscillation generating device, and a diffuser fixedly installed on the outer casing of the combustion chamber. The fuel of the present invention is accelerated through the cross-section of the inlet contraction section, flows through the cavity and the fluid separation device, and through the Coanda effect, the fuel in the cavity periodically flows into the reflux channel located around the cavity, and generates annular periodic disturbances on the fuel flowing into the cavity from the inlet convergence section of the annular fluid oscillation device, thereby causing the fuel to deviate axially and be ejected along the fluid deflection section to the outlet expansion section, realizing a large range of periodic directional changes. The speed direction of the periodic change of the fuel enables the fuel to be more fully mixed with the air, thereby improving the uniformity of the fuel atomization and making the fuel burn better.

The invention belongs to the technical field of low-temperature propellant space storage, and discloses a thermodynamic exhaust system adopting periodic sweeping injection, which comprises a low-temperature propellant storage tank, a concentric multi-layer heat exchanger is arranged in the low-temperature propellant storage tank, and the concentric multi-layer heat exchanger sequentially comprises a hot layer, a cold layer and a spray layer from inside to outside, the fluid oscillator is arranged at the orifice of the spray layer and periodically sweeps and sprays fluid into the tank, the fluid in the cold layer cools the fluid in the hot layer and the fluid in the spray layer, and cold energy is fully utilized, so that the temperature and pressure in the storage tank are reduced. In addition, the concentric multi-layer heat exchanger enables the spray layer, the cold layer and the hot layer to be made into a heat exchanger device, cold energy of the cold layer can be further utilized and transmitted to the spray layer, and the energy utilization rate is improved. The fluid oscillator can enable the fluid to be periodically swept and ejected, disturbance to a flow field in the storage tank is further enhanced, and heat exchange of the fluid is promoted.

A shower head includes a water input pipe, a fluidic oscillator, and at least one water outlet. The water input pipe is configured to supply a flow of water. The fluidic oscillator includes at least one predetermined geometry to control the flow of water ejected from the fluidic oscillator to include a repeating fan of water at a predetermined angle range. The at least one water outlet is configured to provide the flow water including the repeating pattern of water.

Provided is a fluidic oscillator circuit for a nozzle assembly configured to generate oscillating sprays of fluid from an outlet of the nozzle assembly and to improve spray performance of fluid having low temperatures or high viscosity. In one embodiment, provided is an interaction region for a fluidic oscillator circuit that includes an apex protrusion shaped to assist with generating vortices within the interaction region. In another embodiment, provided is an interaction region for a fluidic oscillator having a power nozzle that includes at least one finger protrusion that lengthens the power nozzle to create jets of fluid in the interaction region that are less diffused to improve cold performance of the fluidic oscillator circuit.

This invention discloses a concave cavity flame stabilizer structure, its fuel injection and cooling method, and an afterburner. The structure includes a symmetrical Tesla valve, a fluid oscillator, and shape memory alloy ribs. The Tesla valve is located at the front end of the evaporation chamber of the afterburner, utilizing its unidirectional flow resistance characteristics to suppress fuel backflow caused by pressure fluctuations and ensure stable fuel supply. The fluid oscillator replaces the traditional injection hole, converting the fuel-air mixture into a high-frequency, large-scale periodic swept jet injected into the concave cavity, improving atomization, evaporation, and mixing efficiency. The shape memory alloy ribs are located on the cold side of the bottom and rear wall of the concave cavity, automatically adjusting their shape according to changes in wall temperature to achieve dynamic matching between cooling intensity and heat load. This invention, through the system integration of fuel supply, combustion, and cooling, solves the problems of fuel backflow, low atomization efficiency, and poor adaptability of the cooling system under wide operating conditions in traditional concave cavity structures, significantly improving the combustion efficiency and thermal protection reliability of the afterburner.

Various implementations include a feedback type and jet interaction-type fluidic oscillator devices with atomized output. The device includes first and second fluidic oscillators. Each of the first and second fluidic oscillators include an interaction chamber, a fluid supply inlet, an outlet nozzle, and first and second feedback channels. The first feedback channel of the first fluidic oscillator share a common intermediate portion such that the first feedback channels are in fluid communication with each other, causing the fluid streams exiting the outlet nozzles of the first fluidic oscillator and second fluidic oscillator to oscillate in phase with each other. The outlet nozzle of the first fluidic oscillator and the outlet nozzle of the second fluidic oscillator are structured such that the fluid streams exiting the outlet nozzle of the first fluidic oscillator and the outlet nozzle of the second fluidic oscillator collide with each other, creating an atomized spray.

A multi-stage fluidic oscillating circuit and system can produce an output spray of selectively varying frequency, even though the fluid supplied to the circuit / system is maintained at a substantially constant pressure. The circuit is characterized by two successive stages, each having a power nozzle aligned around a central axis. Upstream and downstream inertance loops are included in each of the stages, with fluid from one of these loops being selectively released to affect the frequency change in the output spray. The circuit is also characterized by a splitter and optional dog ear style protrusions formed in the outlet of the circuit.

The invention relates to the technical field of thermal protection of high-temperature parts of hypersonic flight vehicles, in particular to a periodic swing type jet impingement cooling structure of a scramjet engine based on the coanda effect. Comprising a fluid oscillation jet flow hole structure, a combustion chamber wall face cooling channel and a fuel distribution and recovery device. The combustion chamber wall face cooling channel comprises a cooling channel body, a confluence cavity is formed above the cooling channel body, and a plurality of fluid oscillation jet hole structures are formed in the position, corresponding to the cooling channel body, of the bottom of the confluence cavity. The fuel flow dividing and recycling device is composed of a plurality of flow adjusting devices on a fuel pipeline, and a fuel inlet and a confluence cavity inlet are jointly connected with a fuel pump and a fuel tank through the fuel pipeline. Unpowered periodic swing type jet cooling is adopted, a jet channel is combined with a fluid oscillator, periodic swing of jet is driven through the fluid pressure difference and the coanda effect in the engine, use of extra power equipment is avoided, system complexity is reduced, and cooling efficiency is improved.

There is described a feedback-free fluidic oscillator generally having: a body having a fluid input, an oscillation chamber in fluid communication with the fluid input, and a fluid output in fluid communication with the oscillation chamber, the fluid input flowing a pressurized liquid into the oscillation chamber, which upon interacting with internal walls of the oscillation chamber outputs a liquid spray of oscillating nature at the fluid output, the internal walls of the oscillation chamber defining a cross-sectional shape extending between the fluid input and fluid output, the cross-sectional shape having three or fewer vertices.

A housing equipment device includes a fluidic oscillator, a branch flow path connected to a discharge port of the fluidic oscillator and having multiple branch outlets, and multiple flow path outlets that each are connected to one of the multiple branch outlets and through which a fluid from each of the branch outlets is discharged to open space. Pulsating flows are discharged through the flow path outlets, and the sum of the cross-sectional areas of the narrowest portions in fluid passages located downstream of the discharge port of the fluidic oscillator is greater than or equal to the cross-sectional area of the discharge port of the fluidic oscillator.

A toilet assembly includes a toilet body and a fluidic oscillator. The toilet body defines a toilet bowl that is configured to receive a volume of fluid therein. The fluidic oscillator is coupled to the toilet body in a rim area of the toilet bowl. The fluidic oscillator is positioned to direct a fluid onto an inner surface of the toilet bowl. The fluidic oscillator is configured to continuously redirect the flow of fluid to different locations along the inner surface of the toilet bowl.

The present application relates to the field of oscillator, and provides a fluid oscillator and an aeration device. The fluid oscillator comprises an inlet flow channel for accelerating fluid at the inlet to form a jet flow; two outlet flow channels in fluid communication with the inlet flow channel through a diverging flow channel; a feedback pipe in communication with the two outlet flow channels; and a pulsation source pipe downstream of the feedback pipe and in communication with the two outlet flow channels for generating pressure pulsation to promote switching of the jet flow between the two outlet flow channels. The fluid oscillator can realize high-frequency oscillation of the jet flow at a long distance without increasing the supply pressure and flow rate (i.e. without increasing energy consumption) by shortening the length of the feedback pipe; and the overall structure is more simple and compact.

A method of controlling superplastic forming where a sheet of material is subjected to superplastic forming when in a chamber of a forming apparatus having a supersonic fluidic oscillator (SFO) includes determining maximum and minimum limits for a ratio of supply pressure applied to the SFO related to forming pressure, where the application of supply pressure to the SFO in a manner that maintains the ratio between the maximum and minimum limit causes the SFO to generate continuous, uninterrupted, gas oscillations; with a supply pressure sensor, detecting the gas pressure supplied to the SFO and transmitting it to a controller; with a forming pressure sensor, detecting the forming pressure within the chamber and transmitting it to the controller; and operating the controller to maintain the pressure supplied to the SFO to maintain the ratio of the detected supply pressure to the detected forming pressure between the maximum and minimum limits.

The invention discloses an efficient fluid oscillator, and relates to the technical field of fluid oscillation and jet flow control, the efficient fluid oscillator comprises an oscillator body, the oscillator body is internally provided with a flow channel cavity, and the two ends of the oscillator body are respectively provided with an oscillator inlet and an oscillator outlet which are communicated with the flow channel cavity; two symmetrically-distributed turbulent flow columns used for generating fluid oscillation are arranged in the flow channel cavity, and containing cavities are formed in the turbulent flow columns; the two groups of piezoelectric modules are respectively matched with the turbulent flow columns; the piezoelectric module is provided with a piezoelectric composite sheet and a driving circuit, one end of the piezoelectric composite sheet is mounted in the accommodating cavity, and the other end of the piezoelectric composite sheet hermetically extends out of the accommodating cavity and is positioned on the outer side of the turbulent flow column; and the driving circuit is electrically connected with the piezoelectric composite sheet, so that stable, strong and adjustable oscillation jet flow output can be realized in a wide working condition range from a low working condition to a high working condition through the synergistic effect of active vibration excitation and fluid self-oscillation.

The present application relates to the technical field of power transformer manufacturing and insulation processing, in particular to a transformer vacuum oil injection and hot oil circulation integrated pipeline device and method; the device comprises a main oil tank, a vacuum pump, a main circulating pump, a coaxial antagonistic Helmholtz self-leveling pipeline and a fluid oscillator; the system combines three-dimensional immersion saturation gradient to judge fluid equivalent stiffness, thereby dynamically adjusting pulsation frequency and air extraction pulse width; the core is to make transformer oil generate self-excitation high-frequency pulsation field through the fluid oscillator and coanda effect flow channel, and to realize rapid penetration in the positive pressure period and micro-bubble separation in the negative pressure period by using high-frequency positive and negative pressure alternation; the present application does not simply rely on the traditional way of static pressure, breaks the surface tension of capillary pores and suppresses local bubble nucleation, effectively solves the problems of micro-bubble retention and insufficient deep penetration, and improves the immersion efficiency and uniformity.

The invention provides a nozzle combustion chamber of an annular fluid oscillator. Comprising a combustion chamber outer casing, a flame tube installed inside the combustion chamber outer casing, an annular oscillation generating device installed on the side face of the flame tube, a combustion chamber inner casing installed inside the flame tube, an oil conveying device connected with the annular oscillation generating device and a diffuser fixedly installed on the combustion chamber outer casing. Fuel oil is accelerated through the section of the inlet contraction section and flows through the cavity and the fluid separation device, through the coanda effect, the fuel oil in the cavity periodically flows into the backflow channels located on the periphery of the cavity, annular periodic disturbance is generated on the fuel oil flowing into the cavity from the inlet contraction section of the annular fluid oscillation device, and then the fuel oil deviates from the axial direction; and the fuel oil is sprayed towards the outlet expansion section along the fluid deflection section, so that large-range periodic direction change is realized, the fuel oil can be more sufficiently mixed with air due to the speed and direction of the periodic change of the fuel oil, the atomization uniformity of the fuel oil is improved, and the fuel oil is better combusted.

A method for configuring a learning machine to predict a flow rate of at least one phase of a fluid. The method comprises determining a feature set for the learning machine, the feature set including information derived from a signal generated by a flow of the fluid interacting with a fluidic oscillator in a wellbore. The method comprises configuring the learning machine with the feature set including information derived from the signal.

The invention discloses a control method of an immersed liquid-cooled cabinet, electronic equipment, a device and a readable medium, a temperature sensor is arranged at the bottom of the cabinet, and an opening in the center of the bottom of the immersed liquid-cooled cabinet is aligned with an opening of a fluid oscillator. A left side spoiler is arranged on the side, close to an opening and away from an inlet, of a left side bypass in the fluid oscillator, and a right side spoiler is arranged on the side, close to the opening and away from the inlet, of a right side bypass. Under the condition that the average value of the first temperature detection values is larger than a preset temperature threshold value, the left side spoiler and the right side spoiler are controlled to be in a completely-opened state; under the condition that the average value of the first temperature detection values is smaller than or equal to a preset temperature threshold value, second temperature detection values of the temperature sensors are obtained after a preset duration; and the opening and closing state of the left side spoiler and the opening and closing state of the right side spoiler are controlled according to the second temperature detection values and the first temperature detection values.

An arrangement (1) for the rear impact cooling of an impact plate (2) thermally stressed on its front side (3) by a hot medium (4) comprises the impact plate (2), a perforated plate (6) arranged at a distance from the rear side (5) of the impact plate (2), cooling fluid passage holes in the perforated plate (6) directed towards the rear side (5) of the impact plate (2), a cooling fluid outflow channel (9) formed between the rear side (5) of the impact plate (2) and the perforated plate (6), open in a transverse flow direction (10) at a cooling fluid outlet opening, and a cooling fluid supply channel (13) to which the cooling fluid passage holes are fluidically connected. The cooling fluid supply channel (13), the cooling fluid passage holes, and the cooling fluid outflow channel (9) form a cooling fluid passage through the arrangement (1) that is closed up to the cooling fluid outlet opening.To increase heat transfer from the baffle plate (2) to a cooling fluid (15) flowing through the cooling fluid passage, fluidic oscillators (19) are arranged in the cooling fluid passage.

The invention provides a flap lift augmentation system based on active flow control of fluid oscillators, which comprises a fluid oscillator array arranged in a flap, and the input end of the fluid oscillator array is connected with a pressure regulating valve; the input end of the special airborne computer is connected with the gyroscope, the airflow velocity sensor and the pressure sensor, and the output end is connected with the pressure regulating valve; the input end of the pressurizing chamber is connected with an engine bleed system, and the output end is connected with the pressure sensor and the pressure regulating valve; the fluid oscillator array is formed by stacking an outlet plate, an air inlet plate, a control port plate, a core plate and a base plate in sequence from top to bottom. According to the method, airflow can generate periodic disturbance on the surface of the flap without depending on complex mechanical parts, the aerodynamic characteristics of the surface of a wing are changed, the adhesiveness of the airflow is improved, generation of turbulent flow and vortex is reduced, and finally the lift force of an aircraft is increased and the stall risk is reduced.