CN102937458A - Steady-state entropy probe - Google Patents

Steady-state entropy probe Download PDF

Info

Publication number
CN102937458A
CN102937458A CN2011102325254A CN201110232525A CN102937458A CN 102937458 A CN102937458 A CN 102937458A CN 2011102325254 A CN2011102325254 A CN 2011102325254A CN 201110232525 A CN201110232525 A CN 201110232525A CN 102937458 A CN102937458 A CN 102937458A
Authority
CN
China
Prior art keywords
kiel
pipe
stable state
probe
pitot tube
Prior art date
Application number
CN2011102325254A
Other languages
Chinese (zh)
Inventor
王永生
林峰
聂超群
Original Assignee
中国科学院工程热物理研究所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 中国科学院工程热物理研究所 filed Critical 中国科学院工程热物理研究所
Priority to CN2011102325254A priority Critical patent/CN102937458A/en
Publication of CN102937458A publication Critical patent/CN102937458A/en

Links

Abstract

The invention discloses a steady-state entropy probe which comprises a gill tube, wherein a hole is arranged in the middle of the gill tube; a pitot tube and a thermocouple extend into the gill tube through the hole, and a sleeve is coated outside the thermocouple; and the end of the pitot tube extending into the gill tube and axially parallel to the gill tube faces to the inflow direction in the gill tube. By means of the conventional steady-state measuring elements such as the thermocouple and the pitot tube, the cost of the entropy probe is reduced.

Description

Stable state entropy probe

Technical field

The present invention relates to power electronics industry fluid field field of measuring technique, relate in particular to a kind of miniature stable state entropy probe for the complicated whirlpool of the large flowing angle of catwalk flow field.

Background technology

The present age, turbomachine also will be taken into account high-level efficiency under pursuit high pressure ratio, undersized prerequisite, and the quality of internal flow directly affects efficient.The distribution of producing based on the entropy in the flow field, but the flow losses of each parts of intuitive analysis turbomachine can provide effective information to the design and optimization of turbomachine for the designer to the weight of effectiveness affects when inquiring into loss mechanism.Therefore, the measurement of the entropy of stream field product seems very urgent.

Entropy produces and can't directly measure, and can only indirectly obtain by measuring gained stagnation pressure value and stagnation temperature value.Main application high frequency sound dynamic pressure transducer (high frequency sound dynamic probe) and temperature sensor (high frequency sound hotting mask) in stagnation pressure during the entropy product is measured at present and the total temperature measurement, it is expensive, size is larger, and mainly utilizes the arithmetic mean of stagnation pressure and stagnation temperature when Calculating Entropy produces.Fig. 1 is the photo in kind that prior art is applied to unstable state entropy probe in the turbomachine.As shown in Figure 1, it adopts high frequency sound dynamic probe measurement stagnation pressure is housed in the pressure port, and the variation of air-flow angle has a significant impact its measurement effect greatly; Post the high frequency sound hotting mask on the head substrate, the feed current of the different temperatures at hotting mask two ends by calculating the measured stagnation temperature value of hotting mask as setting up heat conduction and Convective Heat Transfer Equation, passes through formula one Calculating Entropy product by stagnation pressure and stagnation temperature value at last,

Δs = c p ln T t T t , ref - R ln ln P t P t , ref Formula one

Wherein, Δ s is that entropy produces, and its unit is J/K; c pBe specific heat at constant pressure, its unit is J/ (kg.K); R is gas law constant, and its unit is J/kg.K; T is stagnation temperature, and its unit is K, and P is stagnation pressure, and its unit is Pa, T T, refBe the reference stagnation temperature, its unit is K, P T, refBe the reference stagnation pressure, its unit is Pa.

The applicant recognizes: present unstable state entropy probe based on high frequency sound dynamic probe and high frequency sound hotting mask, by phase-locked average (arithmetic mean) although can provide entropy to produce cloud charts, but cost is very expensive, is unfavorable for that it is in the popularization and application of entropy fields of measurement; And internal flow has the features such as the violent and flow channel of High Mach number, flow direction and speed is narrow and small for turbomachine, considers the size of sensor and to the susceptibility of air-flow angle, present unstable state entropy probe can't satisfy the measurement requirement.

Summary of the invention

The technical matters that (one) will solve

For solving above-mentioned one or more problems, the invention provides a kind of stable state entropy probe, to reduce the cost of entropy probe, improve it to the adaptive faculty of turbomachine internal environment.

(2) technical scheme

According to an aspect of the present invention, provide a kind of stable state entropy probe.This stable state entropy probe comprises: the Kiel pipe arranges perforate at the middle part of Kiel pipe; The thermopair that pitot tube and the outside are surrounded by sleeve pipe stretches into pipe inside, Kiel from perforate; Pitot tube stretch into Kiel pipe inner with the axial parallel influent stream direction of end in the pipe of Kiel of Kiel pipe.

Preferably, in the stable state entropy probe of the present invention, thermopair is positioned at pitot tube with respect to the rear side that comes flow path direction, and its length that stretches into the Kiel pipe stretches into the length of Kiel pipe greater than pitot tube.

Preferably, in the stable state entropy probe of the present invention, the head of thermocouple sheath has acute angular cut as the stagnation cover, and the stagnation cover comes flow path direction in Kiel pipe; Middle part at the stagnation cover arranges vent hole, and the hot junction of thermopair is suspended in the stagnation cover.Preferably, the angle of acute angular cut is 45 °.

Preferably, in the stable state entropy probe of the present invention, the Kiel pipe is positioned at the opening tube wall all around of influent stream direction from being outside to inside the acute angle angular cut.Preferably, the angle of acute angle angular cut is 30 °.

Preferably, in the stable state entropy probe of the present invention, Kiel pipe, pitot tube and thermocouple sheath are fixing by soldering or Laser Welding (LBW) sealing.

Preferably, in the stable state entropy probe of the present invention, the external diameter of pitot tube is 0.5mm; The external diameter of thermocouple sheath is 0.8mm; The internal diameter of Kiel pipe is 1.5mm, and external diameter is 1.8mm, and length is 5mm.

Preferably, in the stable state entropy probe of the present invention, pipe middle part, Kiel arranges two perforates; The thermopair that pitot tube and the outside are surrounded by sleeve pipe stretches into pipe inside, Kiel from its corresponding perforate respectively.

(3) beneficial effect

Adopt stable state entropy probe under the prerequisite that requires satisfied the measurement, though can not provide entropy to produce cloud charts, providing correspondingly, entropy product distribution curve still has certain practical significance for loss mechanism research in the flow field.Specifically, stable state entropy probe of the present invention has following beneficial effect:

1. owing to adopting the conventional steady state measurement element such as thermopair, pitot tube, so the present invention has reduced the cost of entropy probe.

2. entropy probe size of the present invention is little, insensitive to the air-flow angle, the measurement problem of solved that the turbomachine passage is narrow and small, entropy producing in the flow field of the millimeter of complex flow and centimetre-sized can play a role in the industries such as aeromotor, gas turbine, central air conditioner centrifugal compressor, CO2 compressor.

Description of drawings

Fig. 1 is the photo in kind that prior art is applied to unstable state entropy probe in the turbomachine;

Fig. 2 is the photo in kind of embodiment of the invention stable state entropy probe;

Fig. 3 a is embodiment of the invention stable state entropy probe sectional structural map;

Fig. 3 b is that Fig. 2 a stable state entropy probe is along the cut-open view of A-A ' direction.

Embodiment

For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.Need to prove, although this paper can provide the demonstration of the parameter that comprises particular value, should be appreciated that, parameter need not definitely to equal corresponding value, but can be similar to described value in acceptable error margin or design constraint.

Fig. 2 is the photo in kind of embodiment of the invention stable state entropy probe.The as can be seen from this figure general structure of this stable state entropy probe and the proportionate relationship of each parts.

Fig. 3 a is embodiment of the invention stable state entropy probe sectional structural map; Fig. 3 b is that Fig. 3 a stable state entropy probe is along the cut-open view of A-A ' direction.Shown in Fig. 3 a and Fig. 3 b, stable state entropy probe comprises: Kiel pipe 1 (Kiel pipe), set gradually two perforates at the middle part of Kiel pipe, the thermopair that pitot tube 2 and the outside are surrounded by sleeve pipe 3 stretches into pipe inside, Kiel from its corresponding perforate respectively, and pitot tube, thermocouple sheath and the Kiel seal of tube are fixed; Pitot tube stretch into Kiel pipe inner with the axial parallel influent stream direction of end in the pipe of Kiel of Kiel pipe.

Shown in Fig. 3 a and Fig. 3 b, D2, D1 are respectively the inside and outside footpaths of Kiel pipe, and L1 is the length of Kiel pipe, for adapting to the applied environment of turbomachine passage, preferably, D1=1.8mm, D2=1.5mm, L1=6mm.For above-mentioned perforate, its position is located at the Kiel tube wall apart from the axial 3.65mm of import, 4mm place, and the size of two perforates is respectively Φ 0.5mm and Φ 0.8mm.

In order to be beneficial to measurement, thermopair is positioned at pitot tube with respect to the rear side that comes flow path direction, and its length that stretches into the Kiel pipe stretches into the length of Kiel pipe greater than pitot tube.

For guarantee to manage interior stagnation pressure the incoming flow flow angle for ± 45 ° with interior unaffected, Kiel pipe 1 is positioned at tube wall around the opening of influent stream direction from being outside to inside the acute angle angular cut.Preferably, the angle of acute angle angular cut is 30 °.

Shown in Fig. 3 a and Fig. 3 b, the inside and outside footpath of pitot tube is respectively D4, D3, preferably, and D4=0.2mm, D3=0.5mm.The distance of pitot tube import and Kiel pipe import is L2, and pitot tube is L3 along airflow direction length, preferably, and L2=2.4mm, L3=1.4mm.The rear end of pitot tube connects other elements that steady state pressure is measured, such as usual pressure transmitter (not shown in Fig. 3 b).

It is 0.5mm that the outer sleeve pipe of thermopair is selected internal diameter, and D outer diameter 5 be the hollow tubular of 0.8mm, and preferably, the hollow tubular head has acute angular cut as stagnation cover 5, and stagnation cover 5 comes flow path direction in manage the Kiel, and preferably, the angle of acute angular cut is 45 °.Otch axial length L 4 is 0.5mm, be the vent hole 6 that Φ 0.2mm is opened in center, L5=0.25mm place at axial length, because the otch inlet-duct area is much larger than vent hole, air-flow speed in otch is very low, pyrometer fire-end 4 (0.25mm being pulled out separately in the hot junction unsettled) is measured herein temperature and can be similar to and think stagnation temperature, so this otch is alleged stagnation cover.Table 1 is the concrete size of each parts of embodiment of the invention stable state probe.

The concrete size of each parts of table one stable state probe

????D1 ????D2 ????D3 ????D4 ????D5 ??1.8mm ??1.5mm ??0.5mm ??0.2mm ??0.8mm ????L1 ????L2 ????L3 ????L4 ????L5 ??6mm ??2.4mm ??1.4mm ??0.5mm ??0.25mm

When carrying out the assembling of stable state entropy probe, fill first pitot tube, rear dress, is welded and fixed pitot tube, sleeve pipe and Kiel pipe together by scolding tin after repeatedly accurately adjusting to the right place (shown in Fig. 3 a and Fig. 3 b) with the thermocouple sheath of stagnation cover.The scolding tin efficient working range is at 220 ℃, if improve the probe working temperature, utilize laser bonding pitot tube, thermocouple sheath and Kiel pipe, certainly, also can take soldering or laser bonding other technologies in addition to reach the fixing purpose of pitot tube, thermocouple sheath and the Kiel seal of tube.

Among the present invention, the pressure unit that the rear end extended line of thermopair is connected with the pitot tube rear end (not shown in Fig. 3 b) accesses respectively the voltage signal acquisition module.And the computing module that is connected with the voltage signal acquisition module, at first pass through the conversion relation formula of temperature, pressure and voltage, the temperature and pressure value that is obtained by voltage signal reduction, and this temperature and pressure brought in the formula one of mentioning in the background technology as stagnation temperature and stagnation pressure, calculate the entropy output value, and and then obtain entropy and produce distribution curve.

In sum, for the present invention, owing to adopt the conventional steady state measurement element such as thermopair, pitot tube, and the price of these steady state measurement elements will be far smaller than the price of the measurement of instability element of mentioning in the background technology, thereby having reduced the cost of whole entropy probe; In addition, entropy probe size of the present invention is little, insensitive to the air-flow angle, the measurement problem of solved that the turbomachine passage is narrow and small, entropy producing in the flow field of the millimeter of complex flow and centimetre-sized, can in the industries such as aeromotor, gas turbine, central air conditioner centrifugal compressor, CO2 compressor, play a role, can help the designer to finely tune design parameter and further optimize turbomachine.

Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (9)

1. a stable state entropy probe is characterized in that, comprising:
The Kiel pipe arranges perforate at the middle part of described Kiel pipe;
The thermopair that pitot tube and the outside are surrounded by sleeve pipe stretches into pipe inside, described Kiel from described perforate; Described pitot tube, described thermocouple sheath and the described Kiel seal of tube are fixed;
Described pitot tube stretch into described Kiel pipe inner with the axial parallel influent stream direction of end in the pipe of Kiel of described Kiel pipe.
2. stable state entropy probe according to claim 1 is characterized in that: described thermopair is positioned at described pitot tube with respect to the described rear side that comes flow path direction, and its length that stretches into described Kiel pipe stretches into the length of described Kiel pipe greater than described pitot tube.
3. stable state entropy probe according to claim 1 is characterized in that:
The head of described thermocouple sheath has acute angular cut as the stagnation cover, and described stagnation cover comes flow path direction in Kiel pipe;
Middle part at described stagnation cover arranges vent hole, and the hot junction of described thermopair is suspended in the described stagnation cover.
4. stable state entropy probe according to claim 3, it is characterized in that: the angle of described acute angular cut is 45 °.
5. stable state entropy probe according to claim 1 is characterized in that: described Kiel pipe is positioned at tube wall around the opening of described influent stream direction from being outside to inside the acute angle angular cut.
6. stable state entropy probe according to claim 5, it is characterized in that: the angle of described acute angle angular cut is 30 °.
7. each described stable state entropy probe in 6 according to claim 1, it is characterized in that: described Kiel pipe, pitot tube and thermocouple sheath are fixing by soldering or Laser Welding (LBW) sealing.
8. each described stable state entropy probe in 6 according to claim 1 is characterized in that:
The external diameter of described pitot tube is 0.5mm;
The external diameter of described thermocouple sheath is 0.8mm;
The internal diameter of described Kiel pipe is 1.5mm, and external diameter is 1.8mm, and length is 5mm.
9. each described stable state entropy probe in 6 according to claim 1, it is characterized in that: pipe middle part, described Kiel arranges two perforates; The thermopair that described pitot tube and the outside are surrounded by sleeve pipe stretches into pipe inside, described Kiel from its corresponding perforate respectively.
CN2011102325254A 2011-08-15 2011-08-15 Steady-state entropy probe CN102937458A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011102325254A CN102937458A (en) 2011-08-15 2011-08-15 Steady-state entropy probe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2011102325254A CN102937458A (en) 2011-08-15 2011-08-15 Steady-state entropy probe

Publications (1)

Publication Number Publication Date
CN102937458A true CN102937458A (en) 2013-02-20

Family

ID=47696369

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2011102325254A CN102937458A (en) 2011-08-15 2011-08-15 Steady-state entropy probe

Country Status (1)

Country Link
CN (1) CN102937458A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104048808A (en) * 2013-03-14 2014-09-17 中国科学院工程热物理研究所 Dynamic entropy probe
CN104101457A (en) * 2013-04-02 2014-10-15 中国科学院工程热物理研究所 Dynamic total pressure probe
CN105716779A (en) * 2015-11-02 2016-06-29 北京航空航天大学 Dynamic pressure blade type probe
CN108225614A (en) * 2017-06-21 2018-06-29 北京航空航天大学 A kind of temperature probe for reducing strut blockage effect using strut air-breathing
CN108225613A (en) * 2017-05-31 2018-06-29 北京航空航天大学 A kind of blown using strut reduces the temperature probe of strut blockage effect

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1360201A (en) * 2000-12-20 2002-07-24 Smc株式会社 Double sensor type flowmeter
CN1595071A (en) * 2004-06-30 2005-03-16 上海理工大学 Detachable combined dynamic pressure for flow and pressure measurement
CN101464232A (en) * 2007-12-19 2009-06-24 王丕征 Semi-volatile organic matter sampling technique in exhaust emission pipe
CN101788313A (en) * 2010-03-23 2010-07-28 上海交通大学 High-frequency response fluid transient flow meter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1360201A (en) * 2000-12-20 2002-07-24 Smc株式会社 Double sensor type flowmeter
CN1595071A (en) * 2004-06-30 2005-03-16 上海理工大学 Detachable combined dynamic pressure for flow and pressure measurement
CN101464232A (en) * 2007-12-19 2009-06-24 王丕征 Semi-volatile organic matter sampling technique in exhaust emission pipe
CN101788313A (en) * 2010-03-23 2010-07-28 上海交通大学 High-frequency response fluid transient flow meter

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
(英)哈洛克(J.H.HORLOCK)著,张文清译: "《轴流式压气机 流体力学及热力学》", 31 December 1966, 国防工业出版社 *
杨永军: "温度测量技术的应用-流体温度的测量", 《计测技术》 *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104048808A (en) * 2013-03-14 2014-09-17 中国科学院工程热物理研究所 Dynamic entropy probe
CN104048808B (en) * 2013-03-14 2016-04-20 中国科学院工程热物理研究所 A kind of kolmogorov sinai entropy probe
CN104101457A (en) * 2013-04-02 2014-10-15 中国科学院工程热物理研究所 Dynamic total pressure probe
CN104101457B (en) * 2013-04-02 2016-03-23 中国科学院工程热物理研究所 Dynamic total pressure probe
CN105716779A (en) * 2015-11-02 2016-06-29 北京航空航天大学 Dynamic pressure blade type probe
CN105716779B (en) * 2015-11-02 2019-02-22 北京航空航天大学 Dynamic pressure blade profile probe
CN108225613A (en) * 2017-05-31 2018-06-29 北京航空航天大学 A kind of blown using strut reduces the temperature probe of strut blockage effect
CN108225614A (en) * 2017-06-21 2018-06-29 北京航空航天大学 A kind of temperature probe for reducing strut blockage effect using strut air-breathing
CN108225614B (en) * 2017-06-21 2019-09-10 北京航空航天大学 A kind of temperature probe reducing strut blockage effect using strut air-breathing

Similar Documents

Publication Publication Date Title
US7946187B2 (en) Mass flowmeter
CN101839736B (en) Method and system for multi-path ultrasonic flow rate measurement
CN102141447B (en) Total temperature/total pressure and static probe
BR102012001827B1 (en) Coriolis type mass flow meter
BRPI0409574A (en) differential pressure device for a gas meter arrangement comprising improved flow geometry
US8960018B2 (en) Pitot tube traverse assembly
CN201402160Y (en) Pitot tube flowmeter with zero point calibration function
RU2612955C1 (en) Process parameter measurement using universal connection platform for flow parameters measurements technology
AT6894U2 (en) Measuring chamber for photoacoustic sensors
CN203732104U (en) Laminar flow tube used for flow detection of high temperature and high pressure gas
WO2010006474A1 (en) A composite gas fluid flow measuring method and its device
Lee et al. Recent progress in the study of transition in the hypersonic boundary layer
JP2016510896A (en) Measurement of process variables using a primary element connection platform.
CN202304903U (en) Exact air quantity measuring system
CN102087130B (en) Computational fluid dynamics (CFD) technology-based method for optimizing acoustic path of multi-path ultrasonic flowmeter assembled in elbow pipe
CN104101457B (en) Dynamic total pressure probe
CN101629837A (en) Liquid turbine flow meter and flow measuring method thereof
CN100538307C (en) A kind of wind tunnel calibration method for large flow gas pipeline averaging velocity tube flowmeter
CN102483339A (en) Fluid flow conditioner
CN100356176C (en) Minisize low speed airspeedometer for mini aircrafts
US4433584A (en) Total pressure probe
CN101430025A (en) Flow rate measurement valve
CN103868623B (en) The measurement apparatus of temperature of liquid and method in a kind of pipeline
GB2432220A (en) Attitude error self-correction for thermal sensors of mass flow meters and controllers
WO2008133134A1 (en) Temperature sensor

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C02 Deemed withdrawal of patent application after publication (patent law 2001)
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20130220