23 results about "Fluidic oscillator" patented technology

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.

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 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.

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.

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.

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.

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.

The invention belongs to the technical field related to low-temperature freezing, and discloses array type liquid nitrogen quick-freezing equipment and method based on a multi-mode fluid oscillator, and the array type liquid nitrogen quick-freezing equipment comprises a quick-freezing cavity and a nozzle array arranged in the quick-freezing cavity; the nozzle array is formed by arranging a plurality of fluid oscillator nozzles in an array mode, the fluid oscillator nozzles can convert input continuous liquid nitrogen flow into fan-shaped oscillation jet flow periodically swinging within a preset sweeping angle range, and each fluid oscillator nozzle comprises a fluid oscillator inlet, a fluid oscillator cavity and a fluid oscillator outlet. The fluid oscillator inlet and the fluid oscillator outlet are respectively connected to two opposite sides of the fluid oscillator cavity; the fluid oscillator cavity is divided into two feedback channels and a fluid mixing chamber which are communicated, the two feedback channels are symmetrically arranged relative to the fluid mixing chamber, and the fluid mixing chamber is located between the fluid oscillator inlet and the fluid oscillator outlet. The cold field uniformity and the liquid nitrogen utilization rate are improved.

This invention provides an indoor unit, an air conditioner, and a control method thereof. The indoor unit includes: a base shell with an air outlet duct and an air outlet; and a sweeping structure, which includes at least a fluid oscillator rotatably disposed within the air outlet duct. Multiple fluid oscillators are spaced apart along the length of the indoor unit, forming a first air outlet channel between adjacent oscillators for at least a portion of the airflow. A second air outlet channel is provided within each fluid oscillator for at least a portion of the airflow to pass through, and the second air outlet channel is used to generate an oscillating airflow. Applying the technical solution of this invention, the airflow in the air outlet duct generates a vertically self-excited oscillating airflow after passing through the fluid oscillators. Combined with the left and right sweeping of the fluid oscillators, the airflow has a strong oscillating effect in both the vertical and horizontal directions, achieving an oscillating airflow effect, avoiding direct airflow onto the human body, and improving airflow comfort.

The invention relates to the technical field of inner and outer flow channel design of aircrafts and aero-engines, in particular to a fluid oscillator outlet jet flow sweeping behavior characterization method which comprises the following steps: step 1, obtaining the geometric dimension dh of an outlet throat of a fluid oscillator to be characterized, the outlet jet flow velocity amplitude Uout and the outlet maximum jet flow deflection angle A; step 2, calculating an oscillation period T according to the parameters obtained in the step 1 and a corresponding relation between the Sstharal number St of the fluid oscillator and the outlet jet velocity; step 3, according to the oscillation period T obtained in the step 2, carrying out standardized transformation on the current physical time; and 4, according to the normalized time t obtained in the step 3, establishing a function model that the outlet jet deflection angle phi changes along with the normalized time t. The internal flow of the fluid oscillator can be prevented from being solved repeatedly, and the development time and cost of an oscillating jet active flow control scheme are reduced.

The application discloses a kind of gas-liquid compatible photovoltaic cleaning and heat management collaborative system and its control method, belong to photovoltaic system technical field.The system includes fluid oscillator, gas supply unit, water supply unit, medium selection unit, heat management unit and control unit.The medium selection unit only allows gas or liquid single medium to enter the same fluid oscillator at the same time, realizes dry-wet alternate cleaning;The heat management unit adopts vertical layered two-phase change material structure, realizes long-acting temperature control and transient cooling cooperation.The control method matches daily cleaning, heavy pollution cleaning, transient strong cooling, low-temperature cleaning and other modes according to real-time parameters, and is closed-loop optimized.The application solves the problems of large water consumption of traditional photovoltaic cleaning, winter operation, insufficient transient response of heat management, realizes all-weather all-scene unattended operation and maintenance, significantly improves power generation efficiency and reduces operation and maintenance cost.

The fluid oscillator is applied to the control method of high-load compressor corner area flow separation, and the structure of the fluid oscillator comprises an air inlet, a porous material, an intermediate transition section, a micro controllable valve, an inlet and an outlet, the air inlet is adjacent to the pressure surface side of the compressor blade, the porous material is connected with the air inlet, one end of the intermediate transition section is connected with the air inlet, the other end of the intermediate transition section is connected with the micro controllable valve, the micro controllable valve is connected with the inlet, the inlet is connected with the outlet, and the outlet is located on the end wall near the compressor cascade corner area. Compared with the traditional technology, the application does not need an external air source, has the advantages of simple structure, small volume and weight, long-term work reliability and strong engineering practicability. Through the method, the flow separation near the compressor corner area can be effectively inhibited, the single-stage compressor can obtain a higher pressure ratio, and the turbomachinery has a larger thrust-to-weight ratio and higher efficiency.

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.