CN113607377A - Method for measuring upstream and downstream noise sources of subsonic pipe flow by one-dimensional hot wire probe - Google Patents
Method for measuring upstream and downstream noise sources of subsonic pipe flow by one-dimensional hot wire probe Download PDFInfo
- Publication number
- CN113607377A CN113607377A CN202110915152.4A CN202110915152A CN113607377A CN 113607377 A CN113607377 A CN 113607377A CN 202110915152 A CN202110915152 A CN 202110915152A CN 113607377 A CN113607377 A CN 113607377A
- Authority
- CN
- China
- Prior art keywords
- hot wire
- flow field
- flow
- value
- noise
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
- 238000011144 upstream manufacturing Methods 0.000 title claims abstract description 31
- 239000000523 sample Substances 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000035945 sensitivity Effects 0.000 claims abstract description 3
- 230000010349 pulsation Effects 0.000 claims description 15
- 238000013021 overheating Methods 0.000 claims description 8
- 239000012530 fluid Substances 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 2
- 238000011084 recovery Methods 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 238000012360 testing method Methods 0.000 abstract description 4
- 238000009434 installation Methods 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 description 6
- 238000001228 spectrum Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/06—Measuring arrangements specially adapted for aerodynamic testing
- G01M9/065—Measuring arrangements specially adapted for aerodynamic testing dealing with flow
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/06—Measuring arrangements specially adapted for aerodynamic testing
- G01M9/065—Measuring arrangements specially adapted for aerodynamic testing dealing with flow
- G01M9/067—Measuring arrangements specially adapted for aerodynamic testing dealing with flow visualisation
Abstract
The invention discloses a method for measuring upstream and downstream noise sources of subsonic pipe flow by a one-dimensional hot wire probe, and belongs to the technical field of flow field test. And judging the direction of the noise source and the frequency characteristic by measuring a fitting curve between the hot wire output pulsating voltage and the sensitivity coefficient. The method for measuring the upstream and downstream noise sources of the subsonic pipe flow by the one-dimensional hot wire probe has the advantages of simple and easy probe installation and convenient use, and can effectively solve the upstream and downstream noise positioning problem of the narrow pipeline. The adopted one-dimensional hot wire probe has high spatial resolution, the length of a hot wire is less than 2 mm, the diameter of the hot wire is less than 5 microns, and the hot wire can penetrate into a narrow space; the hot wire probe has small turbulent flow to the flow field; the hot wire probe is simple and easy to install; the hot wire signal has high frequency response, and the effective frequency can reach 300 KHz. The above advantages have certain advantages over using a conventional noise sensor to measure the source of locator tube flow noise.
Description
Technical Field
The invention belongs to the technical field of flow field testing, and particularly relates to a method for measuring upstream and downstream noise sources of subsonic pipe flow by using a one-dimensional hot wire probe.
Background
The hot wire anemometer (hot wire for short) is a common device in the technical field of flow field test, is usually used for measuring fluid speed and turbulence, is the most main means for measuring the turbulence of a wind tunnel flow field, but is not yet used for upstream and downstream noise source measurement of pipeline flow. Based on the characteristic that the hot wire is sensitive to the fluid velocity, density and temperature, the method for measuring the upstream and downstream noise sources of the subsonic pipe flow by using the hot wire probe is simple and easy to install and convenient to use, and can effectively solve the upstream and downstream noise positioning problem of the narrow pipeline.
The method for measuring the upstream and downstream noise sources of the subsonic pipe flow by the one-dimensional hot wire probe has the advantages that the adopted one-dimensional hot wire probe has high spatial resolution, the length of a hot wire is less than 2 millimeters, the diameter of the hot wire is less than 5 micrometers, and the hot wire can penetrate into a narrow space; the hot wire probe has small turbulent flow to the flow field; the hot wire probe is simple and easy to install; the hot wire signal has high frequency response, and the effective frequency can reach 300 KHz. The above advantages have certain advantages over using a conventional noise sensor to measure the source of locator tube flow noise.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for measuring upstream and downstream noise sources of subsonic pipe flow by a one-dimensional hot wire probe.
The invention adopts the technical scheme for solving the technical problems that: a method of measuring noise sources upstream and downstream of a subsonic duct flow with a one-dimensional hot wire probe, the method comprising:
step 1: a hot wire of the one-dimensional hot wire probe is arranged in the core flow of the flow field in a direction perpendicular to the incoming flow direction;
step 2: continuously changing the overheating ratio of the hot wire in the flow field to obtain a group of output voltage data of the hot wire instrument, wherein the overheating ratio a of the hot wire is (R ═w-R0)/RwWherein R iswWorking resistance, R, when the hot wire heats up in the flow field0The non-working resistance of the hot wire in the flow field;
and step 3: obtaining a fitting relation curve between a dimensionless pulsation value theta of the working voltage of the hot wire and a dimensionless value r of the sensitivity coefficient of the hot wire according to a formula 1, wherein the abscissa value is r, and the ordinate value is theta;
wherein the content of the first and second substances,
r＝FCTA/GCTA
wherein e' is the root mean square deviation of the operating voltage value at the hot wire superheat ratio;
is the mean value of the operating voltage at the hot wire superheat ratio; t' is the root mean square deviation of the total temperature pulsation of the flow field;
is the flow field total temperature pulsation mean value;
is the total temperature pulsation value of the flow field; ρ is the flow field density, ρ' is the root mean square deviation of the flow field density,
is the mean value of the density of the flow field; u is the flow field velocity, u' is the root mean square deviation of the flow field velocity,
is the mean value of the flow field velocity;
is the flow field mass flow pulsation value; a iswIs the hot wire superheat ratio; a and B are hot-line calibration constants; a is*Is the temperature coefficient of resistance of the hot wire; r*Is the hot wire reference resistance value; eta is the hot wire recovery coefficient; reIs the resistance in the flow field when the hot wire is not electrified and heated; re is the Reynolds number of the flow field; t is0Is the total temperature of the gas stream; k is a function of the hot wire superheat ratio
The slope of (a);
and 4, step 4: judging a subsonic duct flow noise source according to the characteristics of a fitting curve of theta and r;
determining the source of noise as being downstream in the pipe flow when the fitted curve has the following characteristics: the fitting curve is a straight oblique line, the slope is positive, the intersection point of the oblique line and the vertical coordinate is near the origin of the coordinate system and is a positive value, or the oblique line passes through the origin when intersecting the vertical coordinate;
the source of noise is determined to be upstream of the pipe flow when the fitted curve has the following characteristics: the fitting curve is a V-shaped broken line, the broken point of the broken line is positioned on the abscissa and has a positive value, and the abscissa of the broken point is not equal to
In the formula (I), the compound is shown in the specification,
the fluid specific heat ratio is the average value, and M is the flow field Mach number.
The invention has the beneficial effects that:
the method for measuring the upstream and downstream noise sources of the subsonic pipe flow by the one-dimensional hot wire probe has the advantages of simple and easy probe installation and convenient use, and can effectively solve the upstream and downstream noise positioning problem of the narrow pipeline. The adopted one-dimensional hot wire probe has high spatial resolution, the length of a hot wire is less than 2 mm, the diameter of the hot wire is less than 5 microns, and the hot wire can penetrate into a narrow space; the hot wire probe has small turbulent flow to the flow field; the hot wire probe is simple and easy to install; the hot wire signal has high frequency response, and the effective frequency can reach 300 KHz. The above advantages have certain advantages over using a conventional noise sensor to measure the source of locator tube flow noise.
The invention provides a design reference for the application of the hot wire test technology in pipe flow noise measurement.
Drawings
FIG. 1 is a schematic diagram of a method for measuring noise sources upstream and downstream of subsonic duct flow by using a one-dimensional hot wire probe
In the figure: 1. a hot wire probe, 2. subsonic duct flow field, 3. subsonic duct flow upstream noise, 4. subsonic duct flow downstream noise, 5. subsonic duct flow direction, 6. subsonic duct.
FIG. 2 shows the hot-line signal spectrum of the upstream noise spike in Mach 0.8 flow field
In the figure: 1. an upstream noise spike at a frequency of 910 Hz.
FIG. 3 measured ripple characteristic diagram of upstream noise source with frequency of 910Hz
Hot-line signal spectrum with downstream noise spikes illustrating a 480 m/sec flow field
In the figure: 1. downstream noise spike at a frequency of 1020 Hz.
FIG. 5 measured pulsation signature of a 1020Hz downstream noise source
Detailed Description
Fig. 1 is a schematic diagram of a method for measuring upstream and downstream noise sources of subsonic duct flow by using a one-dimensional hot wire probe according to the present invention, wherein 1 is the hot wire probe, 2 is a subsonic duct flow field, 3 is subsonic duct flow upstream noise, 4 is subsonic duct flow downstream noise, 5 is a subsonic duct flow direction, and 6 is a subsonic duct. FIG. 2 is the hot-line signal spectrum of an upstream noise spike on an 0.8 Mach flow field, with 1 being the upstream noise spike at a frequency of 910 Hz. FIG. 3 is a graph of measured ripple characteristics of a noise source upstream of frequency 910 Hz. FIG. 4 is a hot-line signal spectrum of the 80 m/sec flow field with downstream noise spikes, and 1 is the upstream noise spikes at a frequency of 1020 Hz. FIG. 5 is a graph of measured ripple characteristics of a downstream noise source at a frequency of 1020 Hz.
Case 1: the flow field velocity was mach 0.8 with the noise source upstream. In the measuring process, 8 groups of overheating ratio data are collected according to overheating ratios of 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7 and 0.8, and a pulsation characteristic curve graph with an abscissa value of r and an ordinate value of theta is fitted according to a formula 1. The hot wire voltage signal frequency spectrum shown in fig. 2 is obtained through measurement, the noise center frequency (1) is 910Hz, and the actually measured pulsation characteristic diagram of the upstream noise source shown in fig. 3 is obtained through measurement, and is a typical V-fold line, so that the fact that the main noise of the flow field comes to the upstream can be judged.
Case 2: the flow field velocity was 80 m/s with the noise source downstream. In the measuring process, 8 groups of overheating ratio data are collected according to overheating ratios of 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7 and 0.8, and a pulsation characteristic curve graph with an abscissa value of r and an ordinate value of theta is fitted according to a formula 1. The hot wire voltage signal frequency spectrum shown in fig. 4 is obtained through measurement, the noise center frequency (1) is 1020Hz, and the actually measured pulsation characteristic diagram of the downstream noise source shown in fig. 5 is obtained through measurement, is a typical oblique straight line, and can judge that the main noise of the flow field comes to the downstream.
Claims (1)
1. A method of measuring noise sources upstream and downstream of a subsonic duct flow with a one-dimensional hot wire probe, the method comprising:
step 1: a hot wire of the one-dimensional hot wire probe is arranged in the core flow of the flow field in a direction perpendicular to the incoming flow direction;
step 2: continuously changing the overheating ratio of the hot wire in the flow field to obtain a group of output voltage data of the hot wire instrument, wherein the overheating ratio a of the hot wire is (R ═w-R0)/RwWherein R iswWorking resistance, R, when the hot wire heats up in the flow field0The non-working resistance of the hot wire in the flow field;
and step 3: obtaining a fitting relation curve between a dimensionless pulsation value theta of the working voltage of the hot wire and a dimensionless value r of the sensitivity coefficient of the hot wire according to a formula 1, wherein the abscissa value is r, and the ordinate value is theta;
wherein the content of the first and second substances,
r＝FCTA/GCTA
wherein e' is the root mean square deviation of the operating voltage value at the hot wire superheat ratio;
is the mean value of the operating voltage at the hot wire superheat ratio; t' is the root mean square deviation of the total temperature pulsation of the flow field;
is the flow field total temperature pulsation mean value;
is the total temperature pulsation value of the flow field; ρ is the flow field density, ρ' is the root mean square deviation of the flow field density,
is the mean value of the density of the flow field; u is the flow field velocity, u' is the root mean square deviation of the flow field velocity,
is the mean value of the flow field velocity;
is the flow field mass flow pulsation value; a iswIs the hot wire superheat ratio; a and B are hot-line calibration constants; a is*Is the temperature coefficient of resistance of the hot wire; r*Is the hot wire reference resistance value; eta is the hot wire recovery coefficient; reIs the resistance in the flow field when the hot wire is not electrified and heated; re is the Reynolds number of the flow field; t is0Is the total temperature of the gas stream; k is a function of the hot wire superheat ratio
The slope of (a);
and 4, step 4: judging a subsonic duct flow noise source according to the characteristics of a fitting curve of theta and r;
determining the source of noise as being downstream in the pipe flow when the fitted curve has the following characteristics: the fitting curve is a straight oblique line, the slope is positive, the intersection point of the oblique line and the vertical coordinate is near the origin of the coordinate system and is a positive value, or the oblique line passes through the origin when intersecting the vertical coordinate;
the source of noise is determined to be upstream of the pipe flow when the fitted curve has the following characteristics: the fitting curve is a V-shaped broken line, the broken point of the broken line is positioned on the abscissa and has a positive value, and the abscissa of the broken point is not equal to
In the formula (I), the compound is shown in the specification,
the fluid specific heat ratio is the average value, and M is the flow field Mach number.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110915152.4A CN113607377B (en) | 2021-08-10 | 2021-08-10 | Method for measuring subsonic pipe flow upstream and downstream noise sources by one-dimensional hot wire probe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110915152.4A CN113607377B (en) | 2021-08-10 | 2021-08-10 | Method for measuring subsonic pipe flow upstream and downstream noise sources by one-dimensional hot wire probe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113607377A true CN113607377A (en) | 2021-11-05 |
| CN113607377B CN113607377B (en) | 2024-04-16 |
Family
ID=78340140
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110915152.4A Active CN113607377B (en) | 2021-08-10 | 2021-08-10 | Method for measuring subsonic pipe flow upstream and downstream noise sources by one-dimensional hot wire probe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113607377B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102112850A (en) * | 2009-09-07 | 2011-06-29 | 天津空中代码工程应用软件开发有限公司 | Combined measurement instrument for flow field pressure and velocity and method thereof |
| CN111707439A (en) * | 2020-07-10 | 2020-09-25 | 中国空气动力研究与发展中心高速空气动力研究所 | Hyperbolic fitting method for compressible fluid turbulence measurement test data |
| CN112145374A (en) * | 2020-09-23 | 2020-12-29 | 内蒙古工业大学 | Test device for realizing real-time synchronous noise monitoring of wind turbine |
-
2021
- 2021-08-10 CN CN202110915152.4A patent/CN113607377B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102112850A (en) * | 2009-09-07 | 2011-06-29 | 天津空中代码工程应用软件开发有限公司 | Combined measurement instrument for flow field pressure and velocity and method thereof |
| CN111707439A (en) * | 2020-07-10 | 2020-09-25 | 中国空气动力研究与发展中心高速空气动力研究所 | Hyperbolic fitting method for compressible fluid turbulence measurement test data |
| CN112145374A (en) * | 2020-09-23 | 2020-12-29 | 内蒙古工业大学 | Test device for realizing real-time synchronous noise monitoring of wind turbine |
Non-Patent Citations (1)
| Title |
|---|
| 顾光武 等: "偏相干分析在风洞噪声源识别中的应用", 《噪声与振动控制》, no. 4, 31 August 2011 (2011-08-31), pages 142 - 144 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113607377B (en) | 2024-04-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105157948B (en) | A kind of flow testing system being applicable to supersonic speed/hypersonic runner and method of testing | |
| Bradbury et al. | A pulsed-wire technique for velocity measurements in highly turbulent flows | |
| Blackwelder et al. | Scaling of the bursting frequency in turbulent boundary layers | |
| Marusic et al. | Experimental study of wall boundary conditions for large-eddy simulation | |
| CN113418675B (en) | Hot wire measurement wind tunnel flow field disturbance modal method | |
| CN102353410B (en) | Method and device utilizing trace gas to measure air channel volume | |
| CN101788313B (en) | High-frequency response fluid transient flow meter | |
| Chew et al. | Dynamic response of a hot-wire anemometer. Part II: A flush-mounted hot-wire and hot-film probes for wall shear stress measurements | |
| US11187715B2 (en) | Multi-component fast-response velocity sensor | |
| CN115435930A (en) | Three-dimensional full-parameter high-frequency probe for measuring interstage | |
| CN108195510A (en) | A kind of hot air wind tunnel calibration method of hot diaphragm type shear stress sensor | |
| CN113607377B (en) | Method for measuring subsonic pipe flow upstream and downstream noise sources by one-dimensional hot wire probe | |
| CN115435931B (en) | High-frequency entropy probe capable of measuring direction of interstage airflow | |
| Miau et al. | Sensing flow separation on a circular cylinder by micro-electrical-mechanical-system thermal-film sensors | |
| Reshmin et al. | Turbulent flow in a circular separationless diffuser at Reynolds numbers smaller than 2000 | |
| US6230570B1 (en) | Turbulent spot flowmeter | |
| CN110057411B (en) | Flow detection method based on acoustic emission signals | |
| CN218822484U (en) | Three-dimensional full-parameter high-frequency probe for measuring interstage | |
| Pfeil et al. | Boundary-layer transition on a cylinder with and without separation bubbles | |
| Hishida et al. | Turbulence measurements with symmetrically bent V-shaped hot-wires. Part 2: measuring velocity components and turbulent shear stresses | |
| Xu et al. | Momentum and heat transfer in a turbulent cylinder wake behind a streamwise oscillating cylinder | |
| CN216116185U (en) | Electromagnetic differential pressure type mass flowmeter | |
| CN220853937U (en) | Airfoil total temperature probe suitable for arbitrary air flow angle | |
| CN103925951B (en) | By the blower fan of Frequency Converter Control by air quantity on-line monitoring method | |
| Zinoviev et al. | Application of hot-wire technology in a blowdown type transonic wind tunnel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |