WO2016015227A1 - Tube de pitot en l à nouveau amélioré pour une mesure de vitesse d'écoulement d'un fluide - Google Patents

Tube de pitot en l à nouveau amélioré pour une mesure de vitesse d'écoulement d'un fluide Download PDF

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Publication number
WO2016015227A1
WO2016015227A1 PCT/CN2014/083244 CN2014083244W WO2016015227A1 WO 2016015227 A1 WO2016015227 A1 WO 2016015227A1 CN 2014083244 W CN2014083244 W CN 2014083244W WO 2016015227 A1 WO2016015227 A1 WO 2016015227A1
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Prior art keywords
tube
measuring
pitot tube
pitot
small straight
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PCT/CN2014/083244
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English (en)
Chinese (zh)
Inventor
张益民
张驰
Original Assignee
张益民
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Filing date
Publication date
Application filed by 张益民 filed Critical 张益民
Priority to PCT/CN2014/083244 priority Critical patent/WO2016015227A1/fr
Publication of WO2016015227A1 publication Critical patent/WO2016015227A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
    • G01P5/14—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring differences of pressure in the fluid
    • G01P5/16—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring differences of pressure in the fluid using Pitot tubes, e.g. Machmeter
    • G01P5/165—Arrangements or constructions of Pitot tubes

Definitions

  • the present invention relates to a fluid flow rate measuring instrument, and in particular to a further improvement of the L-type standard pitot tube.
  • the L-type standard pitot tube has a special importance, because it is made directly from the principle of Bernoulli equation embodied in fluid mechanics according to the world-recognized law of conservation of energy. It is possible to directly measure the total pressure, static pressure and dynamic pressure of the fluid, and then combine the density, temperature and cross-sectional area of the fluid to accurately calculate the flow rate and flow rate of the fluid.
  • Other differential pressure flowmeters such as S-type pitot tubes, orifice plates, venturis, nozzles, etc., can be used as flow meters simply because they believe the data and fluids they measure from theoretical analysis.
  • the most reliable and inexpensive party The method is measured by a plastic film cylinder embedded in a rigid circular tube, or by a low-pressure water-sealed gas storage tank, which can accurately determine how much volume of gas is obtained in a period of time, and then calculate the calculation according to pressure and temperature.
  • the data of the required state can be.
  • these methods are very cumbersome and costly, and they can only find the average speed in the entire pipeline for a period of time, but cannot obtain the specific speed of each point in the tube, and can not reach the various sites that need to be measured. Therefore, it is the most economical, convenient and reliable method to calibrate other flowmeters with an L-type standard pitot tube with a correction factor equal to one, or as a variety of on-site measuring instruments.
  • to determine the speed of the aircraft flying in the air because the atmospheric pressure changes with altitude, only the pitot tube can be competent.
  • the widely used L-type standard pitot tube was invented by the Frenchman Henri-Pitot (1695-1771) in 1732, and in the mid-19th century by the French scientist Henri-Darcy (Henri-Darcy, 1803-1858) Made important improvements and improvements.
  • the shape of the current L-shaped pitot tube is a right-angle elbow.
  • the right-angled side with the measuring port can be called the measuring section, and the right-angled side is called the supporting section.
  • the four types of L-type standard pitots that can be selected are: AMCA type, NPL type, CETIAT type and DLR type, the measuring head
  • the shape has a hemispherical shape, a semi-elliptical shape, and a truncated cone shape.
  • the ratio of the diameter of the full-pressure measuring port to the outer diameter, the size and position of the static pressure hole are all different, and the production is relatively complicated, so it must be calibrated one by one after being made.
  • the current trend is to make the outer diameter of the pitot tube smaller and smaller, such as:
  • the diameter of the pitot tube cannot be larger than 1/48 of the diameter of the pipe to be tested. In this way, the pipe with a diameter of 200mm can only be measured with a pitot tube of less than 4mm, and it is difficult to find a smaller duct. Fine pitot tube management; and such small duct measurements are important in our scientific, technical and economic activities.
  • Measurements for the L-type standard pitot tube include full pressure measurement and static pressure measurement.
  • the principle of full pressure measurement can be this To understand: If there is a small blind tube with one end open and the other end closed in the air duct and parallel to the axis of the pipe, the open end faces the direction of the fluid, and when the fluid flows to the end of the measuring port, it suddenly stagnate, that is, The axial velocity is suddenly zero. At this time, the dynamic pressure of the fluid is changed to static pressure, and the superposition with the original static pressure in the blind pipe becomes full pressure. This is the sum of the dynamic pressure and static pressure theory. The total pressure measured by the instrument cannot be greater than this sum, and may only be less than this sum.
  • the outer diameter of the measuring head is large and the flow rate is also large, a vortex is formed within a certain range in front of the measuring head, and the pressure measured at the full pressure port may be less than the full pressure.
  • the static pressure measuring hole of the pitot tube is opened on the outer casing wall. When the flow rate is large, the larger measuring head will cause the fluid to form an umbrella flow field, which may cause turbulence in the static pressure hole area. Interference static pressure measurement.
  • the orientation indicator of the current pitot tube is too short, only about 40mm, which is not conducive to adjusting the pitot tube orientation.
  • the present invention aims to provide a measurement fluid flow rate.
  • the improved L-shaped pitot tube which improves the measuring tip section of the existing L-type standard pitot tube, and the measuring head of the current Pittal measurement full-pressure is made of hemispherical, or semi-elliptical sphere, or The truncated cone shape is changed into a small straight pipe; in the direction of the pipe axis, a small straight cone pipe or a conical pipe and an elliptical cone pipe are connected between the small straight pipe and the outer casing of the pitot tube.
  • a modified L-shaped pitot tube for measuring fluid flow rate including an L-shaped outer sleeve and an inner tube.
  • the structural feature is that the measuring head for measuring full pressure is a small straight tube, a small straight tube and an inner tube of the pitot tube. The same, used to transfer the full pressure to the pressure gauge; between the outer wall of the small straight tube and the outer sleeve of the pitot tube, a conical tube with a small cone angle or a conical tube and an elliptical cone tube are connected, and the static pressure measuring hole is opened in the outer sleeve. On the tube; the small straight tube is coaxial with the outer sleeve.
  • the elliptical cone tube is one of the elliptical spheres obtained by rotating the long axis of the ellipse as a pivot.
  • the starting point of the small end of the segment is the circular surface of the conical tube which is tangent to the elliptical sphere, and the other end is an ellipse.
  • the extremely large circular surface of the spherical surface is also a circular surface tangent to the surface of the casing outside the pitot tube. It is obvious that the short axis of the ellipse is equal to the diameter of the outer casing.
  • the outer diameter of the small straight pipe is 0.5 ⁇ 3mm, preferably l ⁇ 2mm ; the distance from the measuring end face of the small straight pipe to the interface with the conical pipe is 3 ⁇ 20 times of the outer diameter of the small straight pipe, preferably 5 ⁇ 15 times; the wall thickness of the measuring end face of the small straight pipe should be processed to 0.05 ⁇ 0.5mm, preferably 0.1 ⁇ 0.2mm; the measuring end face of the small straight pipe is perpendicular to the pipe axis.
  • the conical tube or the conical tube and the ellipsoidal tube can be produced in two ways: one is to turn a material including a conical tube and an elliptical cone into a solid cone and drill, and then weld and polish;
  • the method is to weld or bond a hollow tube with a conical tube, an elliptical cone tube and an outer sleeve and has a static pressure hole, and a full pressure transmission line including a small straight tube and an inner tube;
  • the cone angle is 5 to 20 degrees; the elliptical short axis of the elliptical canal is equal to the diameter of the outer cannula.
  • connection method between the small straight pipe and the conical pipe is welded, bonded or plugged, and the plugging is a movable form that can be inserted and pumped.
  • the outer sleeve can be made smaller than the current large diameter pitot tube, and the diameter of the outer sleeve of the measuring section can be 4.5 mm or less, preferably 2 to 4.5 mm; for the long pole pitot tube for large air duct measurement,
  • the diameter of the support section can be 0.1 to 2.0 times larger than the measurement section, and the cross-sectional shape can be made into an elliptical shape or a shape having a small resistance and a large tolerance.
  • the length of the azimuth indicator rod of the pitot tube is increased from the current 40mm to more than 120mm, and is made into a movable form that can be inserted and pumped.
  • the wall thickness of the end face of the small straight pipe is 0.05 to 0.5 mm, preferably 0.1 to 0.2 mm.
  • the length of the small straight tube is 5 to 15 times its outer diameter.
  • the small straight tube has an outer diameter of 0.2 mm to 3 mm, preferably 1 mm to 2.0 mm.
  • the outer sleeve measuring section has an outer diameter of 4.5 mm or less.
  • connection between the small straight pipe and the conical pipe is welding, bonding or plugging, wherein the plugging is convenient for protecting the small straight pipe; if welding or bonding is adopted, the sleeve can also be used to protect the small straight pipe.
  • Small straight tube The fixing method after insertion can be based on the elasticity of the part, the thread, or other means. The material requirements for the small straight tube are the same as those for the current pitot tube head.
  • the pitot tube further includes an orientation indicator rod, and now the orientation indicator rod of the 4 mm pitot tube is only 40 mm, and the invention is extended to 120 mm or more, and is made pluggable. Form of activity.
  • the diameter of the support section can be 0.1 ⁇ 2.0 times larger than the measuring section, and the cross section of the supporting section can be made into an ellipse
  • the shape or the middle is a rectangle, and the ends are semi-elliptical.
  • a refurbished L-shaped pitot tube for measuring fluid flow rate comprising an L-shaped outer sleeve and an inner tube, the structural feature of which further comprises a small straight tube for measuring the full pressure communicating with the inner tube, and a transition joint
  • the connecting pipe of the small straight pipe and the outer casing the small straight pipe is arranged coaxially with the outer casing, the end face of the small straight pipe is perpendicular to the axis, and the end wall thickness of the end face is 0.05 mm ⁇ 0.5 mm;
  • the distance from the measuring end face to the interface with the connecting pipe is 3-20 times of the outer diameter of the straight pipe, the outer diameter of the small straight pipe is 0.5 mm ⁇ 3 mm; the outer diameter of the measuring section of the outer casing is 4.5 mm the following.
  • the connecting tube is a conical tube, one end of which is connected to the outer wall of the small straight tube, and the other end is connected to the outer sleeve;
  • the tapered tube has a taper angle of 5 ° -20 ° .
  • the connecting pipe comprises a conical pipe and a transition pipe connected to the conical pipe; one end of the conical pipe is connected with a small straight pipe sleeve, The other end of the conical tube is smoothly connected with the transition tube, and the transition tube is smoothly connected with the outer sleeve; the transition tube is formed by the first-class linear curve segment rotating around the axis line of the conical tube; The cone angle is 5. -20°.
  • the streamlined curve segment is a segment of an ellipse whose axis of rotation is an ellipse long axis; the outer diameter of the outer sleeve is equal to the minor axis of the ellipse.
  • the connecting pipe of the present invention may be a hollow pipe or a solid cone drilled by turning.
  • the end face of the small straight pipe has a wall thickness of 0.08 mm to 0.2 mm, more preferably 0.1 mm.
  • the length of the small straight tube is 5 to 15 times its outer diameter.
  • the small straight tube has an outer diameter of 0.5 mm to 3.0 mm, more preferably 1 mm to 2 mm.
  • the outer sleeve has an outer diameter of 2 mm to 4.5 mm.
  • connection between the small straight pipe and the connecting pipe is welding, bonding or plugging, wherein the plugging facilitates the protection of the small straight pipe.
  • the fixing method after the small straight tube is inserted may be depending on the elasticity of the part, the thread, or other means.
  • the material requirements for the small straight tube are the same as those for the current pitot tube head.
  • the pitot tube further includes an orientation indicator rod having a length of at least 120 mm ; thus, the current 4 mm pitot tube orientation indicator rod is from the pitot tube axis
  • the heart is only about 40mm in length, and is longer than 120mm in the present invention. It can be made into an activity form that can be inserted and pumped.
  • the L-shaped outer sleeve includes a measuring section connected to the measuring head and a supporting section perpendicular to the measuring section; in order to avoid insufficient strength and rigidity of the pitot tube support section when measuring the large air duct, the diameter ratio of the supporting section is smaller than the measuring section It is 0.1 ⁇ 2.0 times larger, and its cross-sectional shape is elliptical or rectangular in the middle, and the ends are semi-elliptical.
  • the present invention mainly improves the measuring end section of the L-type standard pitot tube, and the section of the measuring head for measuring the full pressure of the current pitot tube is formed by a hemispherical shape, a semi-elliptical spherical shape, or a truncated cone shape.
  • the outer diameter of the small straight pipe can be selected according to the test result and the actual use condition of the first straight pipe, and generally can be about l ⁇ 2.5mm, preferably about 1.5mm.
  • the length of the small straight tube is generally 3 to 20 times, preferably 5 to 15 times the outer diameter.
  • the thickness of the measuring end wall of the small straight pipe should be processed to 0.05 ⁇ 0.5mm, preferably about 0.1mm, and the end face should be perpendicular to the pipe axis.
  • the small straight tube may be a section that extends outwardly from the inner tube of the current pitot tube, or a straight tube that is inserted into the turned cone tube; it may be fixed or pluggable.
  • the invention greatly reduces the area of the measuring head, reduces the vortex formed in front of the measuring port, makes the full pressure measurement more accurate, and can measure a higher flow rate; meanwhile, since the measuring head is small, and adopted Small cone angle tube transition, the fluid outside the tube is smoother than now, so the static pressure is measured more accurately; because the outer diameter of the pitot tube is easy to be made small, it can reduce the interference to the fluid state, and the measurement can be smaller. Air duct, expand the measuring range.
  • the small straight tube for measuring the full pressure can be made small, the area of the end face of the full pressure measuring port is reduced by several tens of times than the current measuring head area, which can reduce the vortex formed in front of the measuring head, and can make the full pressure
  • the measurement is more accurate, the higher flow rate can be measured, and the measurement range of the high flow rate section is expanded. This is especially relevant for aircraft airspeed tubes for high speed measurements.
  • Due to the use of small cone angle conical tube or conical tube and elliptical cone tube transition the umbrella flow field caused by the current pitot tube measuring head is reduced, and the fluid at the static pressure measuring hole of the outer sleeve is smoother than now, so static The pressure measurement is more accurate.
  • the outer diameter of the measuring section of the L-shaped pitot tube is easily below 4.5mm.
  • the support section of the pitot tube will have insufficient strength and rigidity.
  • the diameter of the support section can be made larger than the measuring section, such as 0.1 ⁇ 2.0 times larger;
  • the cross section is changed to an elliptical shape or other shape with high resistance and small resistance, such as a rectangle in the middle and a semi-ellipse shape at both ends.
  • the measuring head no longer needs to be processed into a spherical shape, an elliptical shape or a truncated cone shape, only a small straight tube is used, which simplifies the production model and is also convenient for the customer.
  • FIG. 1 is a schematic structural view of an embodiment of the present invention
  • FIG. 2 is a schematic view showing the structure of a conical tube and an elliptical cone tube of the present invention
  • Figure 3 is a graph comparing the dynamic pressure measurement data of the present invention with the purchased pitot tube
  • Figure 4 is a comparison chart of another dynamic pressure measurement data of the present invention and the purchased pitot tube
  • Figure 5 is a comparison chart of the dynamic pressure obtained by the static pressure of the wall of the whole body combined with the measured dynamic pressure of the present invention.
  • Figure 6 is a comparison chart of the dynamic pressure measured by the purchased pitot tube and the dynamic pressure obtained by the static pressure combined with the wall pressure of the pitot tube;
  • the applicant has successfully produced four complete re-modified L-shaped pitot tubes and several hemispherical full-pressure measuring tubes of different diameters without static pressure holes, and with the purchased 4mm diameter pitot tube. A comparison test.
  • the outer diameter of the outer tube is 4. 4mm and the diameter of the outer tube is about 10 degrees; the diameter of the cone is about 10 degrees; the diameter of the outer tube is 4. 4mm and the specific diameter of the small tube is 1. 5mm (the minimum is 0. 6mm is used in the test), the extension length is 20mm; 4. 8mm.
  • the hemispherical full-pressure measuring tube without static pressure holes has a diameter of 8mm, 6mm, 3, and 2. 6.
  • the self-contained pitot bearing orientation indicator is installed on site and is approximately 200mm in length. Field test conditions: The fan is 4-72-4A-2900rpm-5. 5kW, the air volume is 4020_7420m3/h, and the wind pressure is 1999_1313Pa.
  • the fan outlet is connected to the round square pipe, and then connected to a bag with a diameter of 250mm and an effective length of 1030mm.
  • the tested PVC straight pipe has a diameter of 250mm and a length of 3800.
  • the test point is opened at a distance of 2000 from the air inlet; the pressure gauge has multiple Us. Pressure gauge and a 475AV digital pressure gauge, as well as ammeter and voltmeter; duct outlet with a screw-adjustable circular plate switch, the switch position can be adjusted very accurately: every revolution of the round plate is equal to the screw axis Move 1. 75mm.
  • the comparison test is to test different test points with the same front and rear opening under different conditions of inserting different instruments into the same test hole, inserting the same depth and maintaining the correct orientation.
  • the unit of the valve opening degree is the corresponding opening degree value multiplied by 8 turns, and each rotation is outwardly moved by 1.75 mm on the screw, that is, an opening degree is equal to 14 mm of the valve outward movement.
  • the Pito 1, Pito 2, and Pito 3 refer to the dynamic pressure data measured by the purchased pitot tube 3 times; (8 full-tube static 1), (8 full-tube static 2) respectively refer to the first time And the difference between the full-pressure measurement of the second full-pressure tube with an outer diameter of 8 mm and the static pressure measurement of the air duct wall; (81 full-tube static 1) and (81 full-tube static 2) respectively refer to the first The difference between the full-pressure measurement value of the outer diameter of the small diameter tube of the diameter of 0.
  • 4#-1, 4# -2, 4#-3, 4#-4, 4#-5 respectively refer to the dynamic pressure values of the first, second, third, fourth, and fifth measurements of the No. 4 tube of the present invention
  • Pressure and 4# dynamic pressure refer to the full pressure measurement value and dynamic pressure measurement value of the No. 4 pipe respectively
  • the (4# static-tube static) refers to the static pressure measurement value of the No. 4 pipe and the static pressure measurement of the duct wall
  • the difference between the values, that is, the static pressure difference; 4# dynamic pressure + static pressure difference refers to the sum of the dynamic pressure measurement value of the No.
  • the curves are clearly divided into three groups, which can be regarded as three curves: the bottom one is the dynamic pressure measured by the purchased pitot tube three times, and the middle one is the self-made 5 times.
  • This line is measured by: measuring the full pressure with a single right angle bend, or measuring the full pressure with a purchased monolithic tube, or a self-contained tube, and the static pressure is taken from the measured duct. Static pressure measurement hole on the wall.
  • the curve 4 is similar to the curve 3, the bottom one is measured by the purchased pitot tube, the middle line is measured 5 times with the self-improved L-type pitot tube, and the top is measured by the applicant's previous patent method. Got it. It can be seen from the graphs 3 and 4: The self-made 4# re-improved L-type pitot tube is more accurate than the purchased pitot tube. The test results of the other three self-contained pitot tubes are the same as those of 4#.
  • the lower line of the graph 5 is the dynamic pressure measured twice by the self-reforming type 4# tube, and the upper line is the movement measured by the full pressure tube of the 4# tube and the static pressure hole on the wall of the air duct. Pressure.
  • the lower line of the graph 6 is the dynamic pressure measured twice by the purchased pitot tube
  • the upper line is the dynamic pressure measured by the full pressure tube of the purchased pitot tube combined with the static pressure hole on the wall of the duct.
  • the interval between the two lines of the graph 6 is larger, indicating that the error of the purchased pitot tube is greater than that of the self-made 4# tube, which means that the self-made improvement is improved.
  • L-shaped pitot tubes are more accurate than outsourced pitot tubes. From the data obtained from the test, it is seen that the static pressure value measured by the purchased pitot tube is about 6% larger than the value measured on the wall of the air duct.
  • the static pressure value measured by the self-made L-type pitot tube is higher than that on the wall of the air duct.
  • the measured value is about 3.8%. It is estimated that this difference may be greater when the wind speed is greater. This may be the main reason why the current pitot tube error is large and cannot be used for wind speed measurement above 40m/s.
  • the data of the present embodiment are measured at a wind speed of 40 m/s or less.
  • the difference in total pressure measured here is small, but the static pressure is significantly different. If the wind speed continues to increase above 40m/s, above 70m/s, above 100m/ s , the measured full pressure may vary greatly. In addition, this time there is no liquid test, the difference in the flow may be greater than in the air flow.

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  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)

Abstract

La présente invention concerne un tube de Pitot en L à nouveau amélioré permettant de mesurer la vitesse d'écoulement d'un fluide. Une section de forme demi-sphérique, semi-elliptique ou tronconique d'une tête de mesure, qui est utilisée pour mesurer la pression totale d'un tube de Pitot en L existant, est modifiée en une section d'une petite conduite droite (1). Une section d'un tube conique (2) présentant un petit angle de conicité, ou à la fois le tube conique (2) et un tube conique elliptique (5) est/sont raccordés entre la petite conduite droite (1) et un manchon externe (3) du tube de Pitot pour une transition. La petite conduite droite (1) est en communication avec un tube interne du tube de Pitot et est coaxial au manchon externe (3). Étant donné que la taille de la tête de mesure est réduite et que le tube conique présentant un petit angle de conicité est adopté pour une transition, des vortex formés en regard de l'ouverture de mesure sont réduits et le fluide à l'extérieur du tube est plus stable, de sorte que la pression totale et la pression statique soient mesurées de manière plus précise, que des conduits d'air plus petits puissent être mesurés, et que la plage de mesure soit élargie.
PCT/CN2014/083244 2014-07-29 2014-07-29 Tube de pitot en l à nouveau amélioré pour une mesure de vitesse d'écoulement d'un fluide WO2016015227A1 (fr)

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PCT/CN2014/083244 WO2016015227A1 (fr) 2014-07-29 2014-07-29 Tube de pitot en l à nouveau amélioré pour une mesure de vitesse d'écoulement d'un fluide

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PCT/CN2014/083244 WO2016015227A1 (fr) 2014-07-29 2014-07-29 Tube de pitot en l à nouveau amélioré pour une mesure de vitesse d'écoulement d'un fluide

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114001785A (zh) * 2021-11-30 2022-02-01 合肥科迈捷智能传感技术有限公司 一种流量计引压结构和差压式流量计

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US4604898A (en) * 1983-10-21 1986-08-12 Badin Crouzet Pressure measuring device
US5438880A (en) * 1994-05-17 1995-08-08 United Technologies Corporation Electrostatic linear airspeed transducer
CN102033137A (zh) * 2009-10-06 2011-04-27 精工爱普生株式会社 速度检测器以及具有该速度检测器的挥杆工具
CN102141447A (zh) * 2010-12-31 2011-08-03 中国航天科技集团公司第六研究院第十一研究所 总温/总压、静压探针
CN201954152U (zh) * 2010-12-27 2011-08-31 江西洪都航空工业集团有限责任公司 气压高度模拟器管路中空速管快速安装夹具
CN104076166A (zh) * 2014-07-29 2014-10-01 张益民 一种测量流体流速的再改进型l型皮托管

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US4604898A (en) * 1983-10-21 1986-08-12 Badin Crouzet Pressure measuring device
US5438880A (en) * 1994-05-17 1995-08-08 United Technologies Corporation Electrostatic linear airspeed transducer
CN102033137A (zh) * 2009-10-06 2011-04-27 精工爱普生株式会社 速度检测器以及具有该速度检测器的挥杆工具
CN201954152U (zh) * 2010-12-27 2011-08-31 江西洪都航空工业集团有限责任公司 气压高度模拟器管路中空速管快速安装夹具
CN102141447A (zh) * 2010-12-31 2011-08-03 中国航天科技集团公司第六研究院第十一研究所 总温/总压、静压探针
CN104076166A (zh) * 2014-07-29 2014-10-01 张益民 一种测量流体流速的再改进型l型皮托管

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YANG, HUAN ET AL.: "Impact Analysis of the Probe Deflection Angle to the Pitot-Tube In Velocity Measurement Accuracy", MEASUREMENT CONTROL TECHNOLOGY, vol. 31, no. 10, 31 October 2012 (2012-10-31), pages 13, ISSN: 1000-8829 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114001785A (zh) * 2021-11-30 2022-02-01 合肥科迈捷智能传感技术有限公司 一种流量计引压结构和差压式流量计

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