34results about "Fluid speed measurement using swirlflowmeter" patented technology

The invention relates to a flow state sensor (10) for detecting a flow state at a body (16) that may be impinged on by a flow (12). A flow state sensor (10) that is of a simple construction and that is simple to evaluate is characterised in accordance with the invention by at least one frequency detecting device (20) for detecting at least one predefined frequency characteristic of the flow state. The frequency detecting device (20) has at least one oscillation element (22; 22a, 22b, 22c) excitable to resonant oscillatory movement (30) by a flow (12) and having a resonant frequency or natural frequency adapted to the predefined frequency characteristic, especially corresponding to the predefined frequency characteristic. Uses of the flow state sensor (10) in a flow measuring device (62) and in a flow measuring method, and an advantageous production method for the flow state sensor (10) are also proposed.

The invention provides a device and a method for detecting the sanding critical flow velocity of a gas well. The device consists of an axial compression system, a gas supply system, a simulation system, a measuring and acquiring system and a sand processing system. The method comprises the following steps of: providing different supply pressure for the simulation system simulating the production state of the gas well by using the gas supply system; measuring parameters such as inlet pressure, outlet pressure, gas flow rate, sand production volume after a certain experimental time and the like to obtain the sanding critical flow rate through a test result; and combining the sanding critical flow rate with the rock core size to solve the sanding critical flow velocity. Thus, the technology for determining the sanding critical flow velocity of the gas well on site is provided. By adopting the device and the method of the invention, as the experimental conditions are similar to the geological conditions of gas pools, the problem of detecting the sanding critical flow velocity under the condition of open hole completion of the gas well is solved accurately, conveniently and economically, and an experimental evidence is provided for directing on-site production of the gas pools.

The invention provides a separate-type axial-needle blade anemoscope measuring the vortex of the cylinder tube, the knock-down bush set on the inner side of the anemoscope body, the brackets of the circular axial-needle stand respectively set on two end surfaces of the inner side of the anemoscope body, and the adjustable axial-needle stand fixed on the midpoint of the thin knighthead fixed on the brackets, and two subulate points of the needle rotary axis set with the blade cooperating with the adjustable axial-pin stand; at least one opened hole right facing the blade set on the outer side,the approach sensor inserted in the hole and the rotary signal of the blade is output by the approach sensor.

The invention discloses a dual-mode micro flowmeter and a preparation method thereof. The dual-mode micro flowmeter comprises an lower electrode plate, a middle electrode plate and an upper electrodeplate; the lower electrode plate is provided with a heat-sensitive film resistor I for flow rate detection and a heat-sensitive film resistor II for temperature compensation; the middle electrode plate is of an n-shaped structure, and a cross beam of the n-shaped structure is a micro vortex generator; the middle electrode plate is connected to the upper portion of the lower electrode plate; the upper electrode plate is connected to the upper portion of the middle electrode plate; the lower electrode plate, the middle electrode plate and the upper electrode plate are connected to form a micro flowmeter measuring cavity; flowing fluid is guided into the micro flowmeter measuring cavity through the lower electrode plate, the middle electrode plate and the upper electrode plate; the heat-sensitive film resistor I is heated through the galvanization of a lead electrode I connected with the heat-sensitive film resistor I and then detects heat loss caused by flowing; the heat-sensitive film resistor II is heated through the galvanization of a lead electrode II connected with the heat-sensitive film resistor II and detects the temperature in the flowing fluid; the micro vortex generator disturbs a flow field, so that periodic vortices occur in the micro flowmeter, and the flow rate in a pipe is obtained according to the separation frequency of the vortices.

The invention discloses a wind speed on-line measurement system and a test method. The measurement system includes a test pipeline, a monitoring board, a differential pressure detection circuit, a voltage signal acquisition and conversion circuit, a single-chip microcomputer, a communication module and a receiving terminal. The test method is as follows: 1) a measurement system is placed in a wind field; 2) wind speed measurement is performed through a detection plate, and wind speed signals are converted to voltage signals; 3) then voltage signal acquisition is performed through the differential pressure detection circuit, and voltage signals are transmitted to the single-chip microcomputer after passing through the voltage signal acquisition and conversion circuit; 4) the received voltage signals are reverted to wind speed after being processed through the single-chip microcomputer; and 5) the single-chip microcomputer sends wind speed signals to a receiving terminal through the communication module. The wind speed on-line measurement system provided is simple in structure, the test method is convenient to test, and low wind speed can be accurately measured.

A wind energy installation is disclosed. The wind energy installation includes a rotor with at least one rotor blade. The wind energy installation includes at least one wind speed measuring system. The at least one wind speed measuring system optically measures the vibrations of an optical fiber due to vortex shedding.

The invention relates to an intelligent pipeline flow velocity monitor, and belongs to the field of fluid monitoring. An inner tube in a pipeline is divided into a left cavity and a right cavity by a separator plate. The left cavity is internally provided with a circuit board, and the end portion thereof is equipped with a left end cover; left and right half shafts of a pin shaft are sleeved by a buffer spring and a balance spring respectively; the left half shaft extends out of the left end cover, and the end portion thereof is equipped with an exciter; the right half shaft extends into the right cavity from the separator plate; a right end cover enables two outer frames and at least one inner frame to be pressed in the right cavity; a metal substrate is pressed between the adjacent inner and outer frames and between the inner frames; a cantilever beam of each metal substrate is bonded with a piezoelectric wafer to form a piezoelectric vibrator, and the other end of the cantilever beam is fixed to the right half shaft; and one side of each outer frame and the two sides of each inner frame are provided with a limit surface and a sediment groove. The advantages are that power generation and flow velocity automatic measurement are realized synchronously through a coupling effect, and thus online monitoring of the flow velocity can be realized in a true sense; the monitor, configured along the length direction of the pipeline, is simple in structure and small in radial dimension, and can obtain required energy through the multiple piezoelectric vibrators easily; and each piezoelectric vibrator is reasonable in structure, large in generated energy and high in reliability.

A flow meter for measuring the flow rate of a fluid, with a measuring tube that forms a measurement chamber through which the fluid can flow and with at least one bluff body that is disposed in the measurement chamber and wherein, additionally, a measuring body, which can be displaced due to the formation of vortices at the bluff body, is disposed downstream of the bluff body in the measurement chamber. The flow meter has at least one protrusion protruding into the measurement chamber and is formed upstream of the bluff body at an inner wall delimiting the measurement chamber.

A method for diagnosing and preventing soot blockage in the flue gas channel at the tail of a double tangentially fired boiler. In a cold state, simulate the working condition of the hot state, and measure the section of the heating surface at the key position of the flue gas channel at the tail of the double tangentially fired boiler. Wind speed, compare whether the area with low wind speed is basically consistent with the ash accumulation area; if they are consistent, adjust the opening of the reheated flue gas baffle several times in the cold state and monitor the key positions described under each opening The cross-sectional wind speed of the heating surface, the opening of the reheated flue gas baffle at which the cross-sectional wind speed of the heating surface at the key position is the most uniform is the pre-adjusted opening; in the hot state, adjust the double tangential combustion Boiler parameters, when ensuring the normal operation of the double tangential combustion boiler, make the opening of the reheated flue gas baffle close to the preset opening. The method of the invention only needs to adjust the opening of the flue gas baffle to prevent and prevent ash blockage in the flue gas passage at the tail, and is easy to implement, low in cost and easy to control.

The invention discloses a liquid flow rate detection device and detection method based on positive electron technology and vortex street phenomenon. The detection method comprises the following steps:firstly injecting positive electron nuclide with activity into the liquid, and then injecting the liquid from an access pipe of a detection module, enabling the liquid to produce Kalman vertex streetphenomenon when flowing through a generating body through the vortex generating body, thereby forming the vortex; and then detecting the gamma photon produced by the positive photon decay of the nuclide by utilizing the gamma photon detection device, and obtaining the falling frequency of the vortex by utilizing the peak value and valley value of the detected gamma photon event number, thereby computing the flow rate passing through the pipeline by the liquid in the unit time. The gamma photon response line of the liquid for producing the Kalman vortex street phenomenon under a harsh environment (such as high temperature, high pressure, corrosion and impurity) can be real-time, nondestructively and online or in-place detected, thereby realizing the function of measuring the liquid flow rate in the measurement pipeline.

The invention discloses a method using a non-extension type miniature sound detectors to perform flow measurement and belongs to the field of hydrodynamics. The method is characterized in that the miniature sound detectors are arranged inside a to-be-measured fan; by one sound detector A, a phase-determined sound signal is transmitted to one flow vortex K of a flow boundary layer and is reflectedto obtain the Doppler frequency shift speed components of the A and the vortex K in the direction i; in the similar way, by another sound detector B, the Doppler frequency shift speed component of thevortex k in the direction j is obtained; the different speed components are overlapped to obtain the speed and direction of the vortex K; the detectors transmit the pulse sound wave signals at constant time intervals to obtain the Doppler frequency shift components of multiple vortexes in corresponding directions; the sound detectors are arranged in a linear or planar vertical manner to measure flow planar speed fields and three-dimensional speed fields inside the flow boundary layer. The method is fast in instantaneous response, small in error, low in resource consumption and worthy of popularization.

A flow meter for measuring the flow velocity of a fluid includes a measurement tube that is axially bounded by at least one flange end and that forms a measurement space that can be flowed through by the fluid. At least one baffle is provided for generating interference in the flow, wherein the baffle is arranged in the measurement space. A detector for detecting the interference is arranged downstream of the baffle. An insertion element is introduced into the measurement tube and has a base portion. The base portion is arranged in the flange end. The insertion element has brackets that adjoin the base portion and that project into the measurement space, with the baffle being formed and its position in the measurement space being held between the brackets.

A flow speed sensor arrangement is provided for measuring a flow speed of a fluid stream relative to an object. The arrangement comprises a first obstructive body having a first forward facing surface and two lateral edges and a second obstructive body having a second forward facing surface. The second obstructive body is positioned in tandem relative to the first obstructive body so that the first and second forward facing surfaces face the same direction and so that when the first forward facing surface is presented to an incoming fluid stream, the first obstructive body is between the incoming fluid flow and the second obstructive body. A sensor array is disposed on the second forward facing surface. The first and second obstructive bodies are attachable to the object so that the first forward face is presented to an incoming fluid stream when the object is immersed in the fluid stream.