20 results about "Sonic nozzle" patented technology

The invention provides a method for correcting the outflow coefficient of a sonic nozzle and a method for correcting the flow of gas flowing out of the sonic nozzle, and belongs to the technical field of metrology. The method for correcting the outflow coefficient of the sonic nozzle comprises the steps that according to Reynolds number traceability calculation values under different stagnation conditions, a theoretical calculation value during outflow coefficient traceability is obtained; according to the outflow coefficient traceability value, the Reynolds number traceability calculation value and the outflow coefficient traceability theoretical calculation value under different stagnation conditions, obtaining a correction relationship among the Reynolds number traceability calculation value, the outflow coefficient traceability value and the outflow coefficient traceability theoretical calculation value under any stagnation condition during traceability; and according to the Reynolds number calculation value, the outflow coefficient theoretical calculation value and the correction relation under any stagnation condition during actual measurement, an outflow coefficient correction value under any stagnation condition during actual measurement is obtained. The method for correcting the outflow coefficient of the sonic nozzle is not limited by the Reynolds number, and the outflow coefficient of the small-throat-diameter sonic nozzle under different stagnation conditions can be accurately calculated.

The invention relates to an aero-engine ground test bed air inlet flow pipe calibration system, and relates to the technical field of air inlet flow pipe calibration, an air extractor is used for supplying set mass flow, a standard air inlet flow pipe is used for measuring and calculating actual mass flow, and then a local actual flow coefficient is obtained through back calculation. A calibration coefficient can be obtained through calculation according to the coefficient and used for calibrating the sonic nozzle, calculating theoretical measurement values of other flowmeters, and comparing the theoretical measurement values with actual values for verification; after the sonic nozzle is calibrated, the standard gas inlet flow pipe can be replaced by the gas inlet flow pipe to be calibrated to be used as a sonic nozzle method gas flow calibration device, and then other gas inlet flow pipes are calibrated. Compared with a traditional mode of using a regulating valve to regulate the flow to measure the flow of the engine, the flow metering error can be corrected to a certain degree, data are more accurate, and the method is reliable, simple, convenient, high in efficiency and safer.

The invention relates to an automatic analysis system and method for test data of sonic nozzle products, and belongs to the technical field of data processing. The method comprises the following steps: importing a test data file and displaying an original data curve; in the multi-mode data analysis mode, working conditions needing to be calculated and analyzed are selected; automatically calling stored historical parameter configuration; calculating parameters are manually adjusted; carrying out data processing and analysis by adopting an inflection point judgment algorithm based on dynamic threshold adjustment, inputting the obtained data into a correlation analysis model, and calculating to obtain a test data curve of each channel and a data correlation analysis result; the test data analysis curve and the data analysis result are visually displayed; and automatically generating a test report according to a preset template. According to the method, human errors in the data processing process can be eliminated, the visualization effect of the data is enhanced, the labor cost is reduced, and the working efficiency is improved.

The invention relates to the technical field of gas flow measurement, and discloses a deposition early warning method and system for a sonic nozzle gas flow standard device, and the method comprises the steps: collecting a dynamic pressure signal of upstream gas of a sonic nozzle, and recognizing and segmenting a transient risk window; transmitting an ultrasonic detection signal to the airflow in the sonic nozzle, receiving a penetration signal of the airflow, and extracting a coherent acoustic characteristic quantity used for representing the state of a boundary layer of the throat wall surface of the nozzle; and performing comparative analysis on the coherent acoustic characteristic quantity and a pre-established reference characteristic spectrum to generate early warning information. According to the method, a progressive accurate diagnosis chain from macroscopic fluid dynamic capture to microscopic surface effect detection to metering risk quantitative evaluation is constructed, so that the fundamental technical difficulty that silence misalignment caused by deposition of a sonic nozzle gas flow standard device is difficult to perceive and quantitatively evaluate is solved; and the reliability of the detection result of the device is improved.

The utility model discloses a loop type natural gas calibration system with leak detection capability, which relates to the technical field of natural gas metering and comprises a loop unit, a flow and pressure control unit, a temperature control unit, a leak detection unit and a control unit, and natural gas circulates in the loop unit. The flow and pressure control unit, the temperature control unit and the leak detection unit are electrically connected with the control unit; the flow and pressure control unit is used for stabilizing the flow and pressure of the natural gas in the loop unit; the temperature control unit is used for stabilizing the temperature of natural gas in the loop unit; the leak detection unit is used for detecting whether two ends of the detected flowmeter leak or not; a first electric ball valve, a differential pressure transmitter, a second temperature transmitter and a sonic nozzle standard meter are further arranged on the loop unit. The system can simplify the natural gas verification and adjustment process, reduces the dependence on a natural gas transmission station, has the leakage detection capability, and is worthy of popularization and application.

This invention discloses a loop-type natural gas secondary calibration system and calibration method, including a loop unit, a flow and pressure control unit, a temperature control unit, a leak detection unit, and a control unit. Natural gas circulates within the loop unit. The flow and pressure control unit, temperature control unit, and leak detection unit are all electrically connected to the control unit. The flow and pressure control unit stabilizes the flow rate and pressure of the natural gas within the loop unit; the temperature control unit stabilizes the temperature of the natural gas within the loop unit; the leak detection unit detects whether leaks have occurred at both ends of the flow meter under test. The loop unit also includes a first electric ball valve, a differential pressure transmitter, a second temperature transmitter, and a sonic nozzle standard gauge. The calibration method includes calibration preparation, calibration operation, and leak detection operation. This system simplifies the natural gas verification and regulation process, reduces dependence on natural gas transmission stations, and has leak detection capabilities, making it worthy of widespread application.

The invention discloses a gas flow measurement error correction method and system based on a critical flow sonic nozzle, and relates to the technical field of gas flow measurement, and the method comprises the following steps: carrying out logarithmic operation on a sharpened average power spectrum, executing inverse discrete Fourier transform to obtain a real cepstrum sequence, and extracting the characteristics of a low cepstrum interval to obtain the gas flow measurement error. Calculating a characteristic factor representing the state of the boundary layer of the nozzle throat; meanwhile, the Reynolds number under the current flowing working condition is calculated on the basis of static pressure and static temperature data, the ISO standard outflow coefficient is dynamically corrected in combination with a pre-calibrated Reynolds number partition sensitivity coefficient, and the corrected outflow coefficient is obtained. By performing autocorrelation analysis on a real cepstrum high delay interval, judgment on a critical flow state of a nozzle is realized, and actual mass flow is calculated based on a corrected outflow coefficient under a stable critical flow condition, so that the accuracy and stability of flow measurement under a wide working condition are improved, and a system error introduced by a traditional static correction model is reduced.

The present invention provides a particle manufacturing device and a manufacturing method for frozen particles capable of quickly manufacturing frozen particles while preventing clogging of a nozzle due to freezing. The present invention provides a particle manufacturing device including: a freezing chamber in which frozen particles obtained by freezing an object to be treated containing moisture in a particulate form are accommodated; an ultrasonic nozzle configured to discharge the object to be treated after or before being frozen in a particulate form into the freezing chamber; and a decompression device configured to decompress the freezing chamber, in which the moisture is evaporated due to decompression, and the frozen particles are cooled and frozen by the evaporation of the moisture.

The utility model discloses a positive pressure method sound speed nozzle air flow test platform's calibrating device, including the support guide frame for supporting, is located the rear end surface center of support guide frame fixedly seted up servo motor, and is located servo motor's output setting has two -way screw rod. The utility model discloses a guide device is set up, when the air flow of different models flowmeter is carried out air flow verification, and the speed reducer can through the sliding limit of transmission axle and transmission guide groove, and then synchronous belt drive two sets of positioning gear rotate, make positioning gear can synchronous belt drive two sets of transmission gear ring and carry out the overturning of cycle 90 degrees to the subsequent first detection pipe and second detection pipe of different diameter carry out alignment, effectively improve the adaptability of equipment to the different models flowmeter and carry out the verification, and then improve the practicality of equipment.

The present application relates to turbine blowing test device and method, specifically relates to turbine blowing test pressure ratio continuous adjusting device and method, its purpose is to solve the existing turbine blowing test method cannot continuously adjust pressure ratio, test efficiency is low, test precision is poor, and the problems such as expensive price, adjusting precision is poor, resolution is low of using large-diameter regulating valve;The present application is simultaneously provided with back pressure orifice plate and bypass pipe equipped with regulating valve on turbine outlet pipe, uses regulating valve to adjust turbine pressure ratio, so that the device can continuously test after once calibration;The present application can also be equipped with bypass pipe with high-pressure gas source, pressure reducing valve, pre-pressure temperature measuring instrument of sonic nozzle, sonic nozzle and stop valve on turbine outlet pipe, the turbine pressure ratio is adjusted by adjusting pressure reducing valve, and continuous test can also be realized after once calibration of the device.

This invention discloses a method and system for correcting gas flow measurement errors based on a critical flow sonic nozzle, relating to the field of gas flow metering technology. The method includes performing logarithmic operations on the sharpened average power spectrum and executing an inverse discrete Fourier transform to obtain a real cepstrum sequence. By extracting features from the low cepstrum frequency range, characteristic factors representing the nozzle throat boundary layer state are calculated. Simultaneously, the Reynolds number under the current flow condition is calculated based on static pressure and static temperature data, and the ISO standard outflow coefficient is dynamically corrected using a pre-calibrated Reynolds number partition sensitivity coefficient to obtain the corrected outflow coefficient. By performing autocorrelation analysis on the high time delay range of the real cepstrum, the critical flow state of the nozzle is determined. Under stable critical flow conditions, the actual mass flow rate is calculated based on the corrected outflow coefficient, improving the accuracy and stability of flow measurement under wide operating conditions and reducing the systematic errors introduced by traditional static correction models.

This application relates to the technical field of wind tunnel flexible nozzle profile control devices, specifically, to a method for maintaining the sonic profile of a continuous transonic wind tunnel hydraulically controlled flexible nozzle. The method includes the following steps: calculating the total load on each support node of the flexible nozzle's sonic profile; assembling the node support mechanism onto the flexible plate of the flexible nozzle; the node support mechanism includes a mechanical locking device; returning each node to its mechanical zero position; and locking the mechanical locking device; giving the hydraulic servo control system a sonic nozzle forming command; unlocking the mechanical locking device; and allowing the flexible nozzle profile to move from its mechanical zero position to the sonic nozzle profile through coordinated control by the hydraulic servo system; when the dynamic adjustment of the sonic nozzle profile meets the control accuracy requirements, locking the mechanical locking device; the hydraulic servo system exits the dynamic adjustment state; and the mechanical locking device provides the locking force to maintain the sonic nozzle profile. This achieves the goal of maintaining a more stable sonic profile of the flexible nozzle.

The utility model provides a critical flow venturi nozzle assembly and a flow detection system, and the critical flow venturi nozzle assembly comprises a critical flow venturi nozzle distributor, a pneumatic flow amplifier and a heater. The critical flow venturi nozzle distributor comprises a stagnation container, a collection container, a sonic nozzle, an air cylinder, a temperature detection device and a pressure detection device, an air inlet of the stagnation container is connected with an outlet of the pneumatic flow amplifier, the two ends of the sonic nozzle are located in the stagnation container and the collection container respectively, and the air cylinder is in driving connection with the sonic nozzle; the temperature detection device and the pressure detection device are communicated with the stagnation container and are used for detecting the gas temperature and the gas pressure in the stagnation container so as to calculate the flow of the gas to be detected; an inlet of the heater communicates with the air source assembly, and an outlet of the heater communicates with an inlet of the pneumatic flow amplifier. According to the critical flow venturi nozzle assembly and the flow detection system, the requirement for the detection environment can be lowered, and the reliability of the detection result is improved.

The invention discloses a decoupling evaluation method for leak rate and tube volume effect in gas small flow verification, which relates to the field of gas flow standard, and comprises the following steps: carrying out air tightness test on a positive pressure sonic nozzle gas flow standard device to be tested to confirm that the positive pressure sonic nozzle gas flow standard device meets a preset air tightness requirement; a leak rate measurement model is constructed, leak rate measurement is carried out under the selected multiple pressure points and flow points, and leak rates under different verification working conditions are obtained; a pipe volume effect measurement model is constructed, and the total mass change rate under different verification working conditions is obtained; deducting the leakage rate contribution under the corresponding working condition from the total mass change rate, and decoupling to obtain a tolerance rate caused by a pipe capacity effect; and the influence rule of the leakage rate and the tube volume effect on the gas small flow verification result is evaluated, and a verification optimization strategy is determined. According to the method, decoupling and independent quantification of the coupling influence of the leak rate and the tube volume effect in gas small-flow verification are achieved, and a quantitative basis is provided for evaluating device performance and optimizing verification operation.

This application relates to the field of gas flow metering technology and discloses a deposition early warning method and system for a sonic nozzle gas flow standard device. The method includes: acquiring the dynamic pressure signal of the gas upstream of the sonic nozzle, identifying and segmenting the transient risk window; emitting an ultrasonic detection signal into the gas flow inside the sonic nozzle and receiving its penetration signal, extracting coherent acoustic features to characterize the boundary layer state of the nozzle throat wall; comparing and analyzing the coherent acoustic features with a pre-established benchmark feature spectrum to generate early warning information. This application solves the fundamental technical dilemma of the silent inaccuracy caused by deposition in sonic nozzle gas flow standard devices being difficult to detect and quantify by constructing a progressive and precise diagnostic chain from macroscopic fluid dynamic capture to microscopic surface effect detection, and then to quantitative assessment of metering risks, thereby improving the reliability of the device's detection results.

The utility model discloses a vehicle-mounted sonic nozzle method gas flow standard device, which comprises a compartment body, a gas flow standard device, a gas flow standard device, a gas flow standard device and a gas flow standard device, wherein an installation chamber and a detection chamber are defined by the compartment body; the detected meter mounting module is arranged in the detection chamber; the standard verification module is arranged in the detection chamber, and the standard verification module is connected with the tested meter installation module; the power module is arranged in the mounting chamber, and the power module is constructed to exert a negative pressure suction effect on the standard verification module; and the control module is in signal connection with the power module and the standard verification module, and the control module is configured to adjust the detection range of the standard verification module and the suction pressure intensity of the power module. According to the vehicle-mounted sonic nozzle method gas flow standard device, all parts of the gas flow standard device are modularized, and maintenance and overhaul of the parts of the gas flow standard device are facilitated.

This invention relates to an automated data acquisition method and medium for a gas flow standard device using a sonic nozzle method, belonging to the field of flow metering technology. The method includes: real-time detection of the absolute stagnation pressure of the gas at the inlet of the calibrated sonic nozzle reaching a preset pressure point; determining whether the pressure and temperature are stable within any first preset threshold time period based on the peak-to-peak pressure and peak-to-peak temperature; if both are stable, calculating the discharge coefficient of the calibrated sonic nozzle; and determining whether the stagnation pressure and stagnation temperature at the inlet of both the standard sonic nozzle array and the calibrated sonic nozzle have reached a stable state; if so, determining that the extended uncertainty technical index of the gas flow standard device is within a preset threshold range based on the stagnation pressure and stagnation temperature, and outputting the discharge coefficient of the calibrated sonic nozzle and its corresponding acquired data as the acquired data. This improves the stability of gas flow measurement and the calculation results of the discharge coefficient of the calibrated sonic nozzle.

A combined vacuum power gas source system is composed of a gas ring type vacuum pump, an oil-free dry type vacuum pump, a flow regulating valve and a connecting pipe section which are connected in parallel, a plurality of groups of sonic nozzles with throat diameters gradually increased in an equal difference mode are evenly distributed in a horizontal stagnation container, and a stable flow field is formed by combining a corrugated pipe expansion joint. The detection pipeline system is coaxially connected with a detected meter through a pipe section support fixing straight pipe section, the meter clamping device clamps the detected meter, the automatic detection system collects stagnation pressure and temperature data in real time, flow error analysis and report generation are achieved through a notebook computer database, and the wide-range stable gas supply device has the advantages that wide-range stable gas supply is achieved; the back pressure ratio can be accurately controlled to be 0.5-0.75, and automatic switching of multiple flow points is supported; the device can complete online calibration of the gas flowmeter under the condition that production is not affected, and is suitable for flow metering verification requirements under complex working conditions in industries such as petroleum and chemical engineering.

The invention relates to a turbine blowing test device and method, in particular to a turbine blowing test pressure ratio continuous adjusting device and method, and aims to solve the problems that according to an existing turbine blowing test method, the pressure ratio cannot be continuously adjusted, the test efficiency is low, and the test precision is poor. A used large-diameter adjusting valve is high in price, poor in adjusting precision, low in resolution ratio and the like; the backpressure pore plate and the bypass pipe provided with the adjusting valve are arranged on the turbine outlet pipe at the same time, and the adjusting valve is used for adjusting the turbine pressure ratio, so that the device can be continuously tested through one-time calibration; a bypass pipe provided with a high-pressure air source, a pressure reducing valve, a sound velocity nozzle front pressure and temperature measuring instrument, a sound velocity nozzle and a stop valve can be additionally arranged on the turbine outlet pipe, the pressure ratio of the turbine is adjusted by adjusting the pressure reducing valve, and continuous testing after one-time calibration of the device can be achieved.

This invention discloses a test method and system for a high-pressure gas supply and distribution station. The method includes the following steps: S1: pre-test preparation; S2: test parameter simulation and calculation; S3: gas source pressurization and storage; S4: personnel evacuation; S5: rapid pressurization test. This invention achieves rapid deflation of high-pressure gas by replacing traditional electric detonation valves and high-speed switching valves with rupture discs. This eliminates the regulatory and storage restrictions on pyrotechnics, reducing usage costs and safety risks. Furthermore, relying on the millisecond-level deflation characteristics of rupture discs, it meets the requirements for rapid test response. The rupture disc and sonic nozzle technologies are mature and have no limit on the number of actuations, ensuring long-term stable operation of the equipment. Simultaneously, by replacing sonic nozzles with different throat diameters, combined with critical flow control and precise calculations based on the actual gas state equation, a wide range of pressure increase rate adjustment from 0.1 MPa / ms to 35 MPa / ms can be achieved, with a pressure control accuracy within ±5%, adaptable to test samples of different free volumes.