CN109933956B - Inlet flow tube, horn mouth and design method thereof - Google Patents
Inlet flow tube, horn mouth and design method thereof Download PDFInfo
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- CN109933956B CN109933956B CN201910313824.7A CN201910313824A CN109933956B CN 109933956 B CN109933956 B CN 109933956B CN 201910313824 A CN201910313824 A CN 201910313824A CN 109933956 B CN109933956 B CN 109933956B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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Abstract
The application designs a horn mouth design method of an air inlet flow tube, which comprises the following steps: obtaining a straight line section of the air inlet flow tube and a lip front section of the bell mouth according to a standard model; and the lip back section extends outwards from the lip front section, the lip back section is formed by an arc, and the center of the arc is different from the center of the prototype lip back section in the standard modeling. According to the horn mouth and the design method, the design method that the air inlet flow tube horn mouth replaces a prototype contour line with a section of circular arc is adopted, the problem that the size of the air inlet flow tube horn mouth is overlarge in the prior art scheme is solved, the installation stability and the test accuracy of the acoustic rotary test rake are guaranteed, and the method has higher reliability for a fan booster stage test.
Description
Technical Field
The application belongs to the technical field of turbine tests, and particularly relates to an air inlet flow tube, a horn mouth and a design method thereof.
Background
During the compressor test, air flow is one of the main performance parameters measured by the aerodynamic performance test. The physical flow parameters of the tested pressure air machine are measured by installing an air inlet flow pipe at the inlet position of the tester, and the converted flow of the air machine under different working states is obtained through conversion of the actual air inlet atmospheric conditions and standard atmospheric conditions.
In fan boost level test, need install the rotatory test harrow of acoustics when measuring the noise, the test harrow is annular to be installed in import flow tube horn mouth position, and the test harrow rotates in the test process, and this just needs the rotatory test harrow cantilever of acoustics can not overlength, and the mechanism is enough firm, therefore has certain requirement to the size of flow tube horn mouth.
Referring to fig. 1, in the related standard, the inner wall of the bell mouth of the intake air flow pipe should be modeled as follows:
R 2 ＝a 2 cos2α
wherein: 0.6D < a < 0.8D (D is the flow tube diameter), α=0° to 45 °.
As shown in fig. 2, in order to ensure uniform velocity field at the flow tube measurement cross section, the inlet flare of the prototype flow tube of the fan boost stage test was chosen for minimum radius size flare data, i.e., a=0.6d, in accordance with the above requirements.
The existing standard modeling method can well ensure uniformity of airflow after entering the flow pipe, but when a fan booster stage front sound transmission test is carried out, an acoustic test rake 2 needs to be arranged at an inlet, and the acoustic test rake 2 needs to rotate along a compressor axis 3 and carry out measurement. In the prior art, even if the data (a=0.6d) of the bell mouth with the smallest radius size is selected, the bell mouth size is still too large. As shown in fig. 3, the prototype lip back-end 13 of the flare of the prototype intake flow tube 1 interferes with the relative position where the acoustic test rake 2 is mounted.
Disclosure of Invention
It is an object of the present application to provide an inlet flow tube, flare and method of designing the same that address any of the above problems.
In a first aspect, the present application provides a method for designing a flare of an intake flow tube, the method comprising:
obtaining a straight line section of the air inlet flow tube and a lip front section of the bell mouth according to a standard model;
and the lip back section extends outwards from the lip front section, the lip back section is formed by an arc, and the center of the arc is different from the center of the prototype lip back section in the standard modeling.
In one embodiment of the present application, the center of the arc satisfies
r＝Ay-y
Wherein r is the radius of the circular arc, A is the proportionality coefficient, and y is the distance from the tangent point of the lip to the axis of the air inlet flow tube.
In one embodiment of the present application, the value range of the proportionality coefficient a is 1.05 to 1.1.
In a second aspect, the present application provides an inlet flow tube flare comprising a lip front section and a lip back section, the lip back section being arcuate, the center of the arc being different from the center of the original lip back section in the standard molding.
In one embodiment of the present application, the center of the arc satisfies
r＝Ay-y
Wherein r is the radius of the circular arc, A is the proportionality coefficient, and y is the distance from the tangent point of the lip to the axis of the air inlet flow tube.
In one embodiment of the present application, the value range of the proportionality coefficient a is 1.05 to 1.1.
In a third aspect, the present application provides an air intake flow tube comprising a flare and a straight line segment as described in any one of the above, the flare being fixedly connected with the straight line segment.
In an embodiment of the present application, the flare and the straight line segment are formed by welding.
In an embodiment of the present application, the flare and the straight line segment are integrally formed by casting or machining.
According to the horn mouth and the design method, the design method that the air inlet flow tube horn mouth replaces a prototype contour line with a section of circular arc is adopted, the problem that the size of the air inlet flow tube horn mouth is overlarge in the prior art scheme is solved, the installation stability and the test accuracy of the acoustic rotary test rake are guaranteed, and the method has higher reliability for a fan booster stage test.
Drawings
In order to more clearly illustrate the technical solutions provided by the present application, the following description will briefly refer to the accompanying drawings. It will be apparent that the figures described below are only some embodiments of the present application.
Fig. 1 is a schematic diagram of an intake air flow tube according to the prior art.
Fig. 2 is a prior art flare design schematic.
Fig. 3 is a prior art horn and acoustic test target mounting schematic.
Fig. 4 is a schematic view of a flare of the present application.
Fig. 5 is a schematic cross-sectional view of the horn and acoustic test target mounting of the present application.
Fig. 6 is a schematic diagram of the horn and acoustic test target mounting axis of the present application.
FIG. 7 (a) is a schematic diagram showing the distribution of the flow lines of the prototype horn mouth at the limit of 90kg/s of the outlet flow.
FIG. 7 (b) is a schematic diagram showing the distribution of the flow lines of the horn mouth at the limit of 90kg/s of the outlet flow rate.
FIG. 8 (a) is a Mach number cloud distribution of prototype horns at an outlet flow rate of 90 kg/s.
FIG. 8 (b) is a Mach number cloud distribution of the horn mouth of the present application at an outlet flow rate of 90 kg/s.
Detailed Description
In order to make the purposes, technical solutions and advantages of the implementation of the present application more clear, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the embodiments of the present application.
In order to solve the problem that in the prior art, a horn mouth obtained by adopting a standard modeling method interferes with an acoustic test target 2, the application provides a modeling method of the horn mouth different from the standard modeling.
The design method of the horn mouth comprises the following steps: firstly, obtaining a straight line section 11 of an air inlet flow pipe and a lip front section 12 of a bell mouth according to a standard model; thereafter, the lip rear section 14 is extended outwardly from the lip front section 12, and the lip rear section 14 is constituted by an arc whose center is different from that of the prototype lip rear section 13 in the standard molding.
As shown in fig. 4, the method based on the standard modeling design curve is first to draw the lip front section 12 of the flare under the condition that the diameter of the straight line section 11 of the intake flow tube 4 is not changed, the lip front section 12 and the lip rear section 14 (or the prototype lip rear section 13) are bounded by a lip tangent point, the lip tangent point moves from a plane perpendicular to the axis 3 (the axis 3 is the axis of the intake flow tube 4 and is also the rotation axis of the acoustic measurement target 2) to the lip direction, and the lip tangent point (the cross-sectional view angle is the lip tangent point and is actually a circle on the lip) is obtained when the plane is tangent to the lip. The back lip section 14 is a circular arc with a radiusAnd r, the center of the arc is positioned on the extension line of the tangent point of the lip along the axis 3. The circular arc of the lip 14 satisfies the relationship
I.e., r=ya-y=y (a-1), where r is the radius of the circular arc, a is the scaling factor, and y is the distance of the lip tangent point from the inlet flow tube axis 3.
After a section of circular arc is adopted to replace the molded line of the prototype lip back section 13, the maximum outer ring diameter of the horn mouth is reduced, the dimension s=2 (L-r) is reduced, and L is the distance between the edge of the prototype lip back section 13 and the axis 3 where the lip is cut off.
In the preferred embodiment of the present application, the scale factor a is most suitably in the range of 1.05-1.1, and the radius r of the arc of the back section 13 of the prototype lip can be calculated by the distance y of the lip tangent point from the axis of the flow tube and the scale factor a, so as to obtain the flare of the air intake flow tube.
There is also provided in this application an inlet flow tube and flare comprising a lip forward section 12 and a lip aft section 14, the lip aft section 14 being arcuate with a radius r. The horn mouth and the relevant descriptions of the front lip section 12 and the rear lip section 14 are referred to above, and are not repeated here. The intake flow tube 4 includes the aforementioned flare and straight section 11, the flare being fixedly connected to the straight section 11.
In one embodiment of the present application, the flare and the straight line segment 11 may be fixed together by welding, and the weld joint may be polished after welding to increase the air flow.
In other embodiments of the present application, the flare and straight section 11 may be cast or machined in one piece to increase the flow through of the air stream.
As shown in fig. 5 and 6, the relative installation positions of the flare opening of the air inlet flow tube and the acoustic testing rake are schematic, and the flare opening and the air inlet flow tube 4 with the flare opening obtained by the design method of the present application are smaller than the prototype lip back section 13 in the fan pressurization level test, so that the interference with the acoustic testing target 2 is avoided.
Taking the straight line section diameter of the prototype air inlet flow tube as an example, through calculation, the outer diameter size of the horn mouth of the flow tube is shortened by 15% compared with the whole prototype, and the installation space size requirement of the rotary acoustic testing rake for the fan booster stage test is met.
The flow conditions of the prototype flow tube and the flow tube of the application are stable, no airflow separation and backflow phenomenon exists, and static pressure, mach number and speed and boundary layer change trend are basically consistent.
After the molded surface of the horn mouth of the prototype flow tube is designed and modified, the influence on the flow characteristics of air flow in the flow tube is avoided, the size of the horn mouth is reduced to a certain extent, the space size of the installation of the acoustic rotary test rake in the fan supercharging level test is met, and the installation is stable.
According to the design method, the air inlet flow tube bell mouth replaces a prototype contour line with a section of circular arc, so that the problem of oversized air inlet flow tube bell mouth in the prior art is solved, the installation stability and test accuracy of the acoustic rotary test rake are guaranteed, and the method has higher reliability for fan booster stage tests.
The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions easily conceivable by those skilled in the art within the technical scope of the present application should be covered in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (5)
1. A method for designing a flare of an intake flow tube, the method comprising
Obtaining a straight line section of the air inlet flow tube and a lip front section of the bell mouth according to a standard model;
the lip back section extends outwards from the lip front section, the lip back section is composed of an arc, the center of the arc is different from the center of the prototype lip back section in the standard modeling, and the center of the arc meets the following conditions: r=ay-y
Wherein r is the radius of the circular arc, A is a proportionality coefficient, the value range of the proportionality coefficient A is 1.05-1.1, and y is the distance from the lip tangential point to the axis of the air inlet flow tube.
2. The utility model provides an inlet flow tube horn mouth, its characterized in that, the horn mouth includes lip anterior segment (12) and lip back end (14), lip back end (14) become circular-arc, the center of circular arc is different from the center of original type lip back end (13) in the standard molding, wherein the center of circular arc satisfies: r=ay-y
Wherein r is the radius of the circular arc, A is a proportionality coefficient, the value range of the proportionality coefficient A is 1.05-1.1, and y is the distance from the lip tangential point to the axis of the air inlet flow tube.
3. An inlet air flow tube, characterized in that the inlet air flow tube (4) comprises a flare and a straight line segment (11) according to claim 2, the flare being fixedly connected with the straight line segment (11).
4. The intake flow tube of claim 3, wherein the flare and the straight section (11) are formed by welding.
5. The intake flow tube of claim 3, wherein the flare and the straight section (11) are cast or integrally formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910313824.7A CN109933956B (en) | 2019-04-18 | 2019-04-18 | Inlet flow tube, horn mouth and design method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910313824.7A CN109933956B (en) | 2019-04-18 | 2019-04-18 | Inlet flow tube, horn mouth and design method thereof |
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| Publication Number | Publication Date |
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| CN109933956A CN109933956A (en) | 2019-06-25 |
| CN109933956B true CN109933956B (en) | 2023-05-23 |
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| CN113704850B (en) * | 2021-08-27 | 2022-06-10 | 江苏大学 | Method for designing bell mouth of water inlet flow channel of bidirectional pump station |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005106236A1 (en) * | 2004-03-30 | 2005-11-10 | Menard, Inc. | Induction system for an internal combustion engine |
| CN107270979A (en) * | 2017-05-18 | 2017-10-20 | 东方电气集团东方汽轮机有限公司 | A kind of aerodynamic testing air-flow measurement device |
| CN108412618A (en) * | 2018-04-17 | 2018-08-17 | 中国人民解放军国防科技大学 | Hypersonic/supersonic axisymmetric inlet lip and design method thereof |
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- 2019-04-18 CN CN201910313824.7A patent/CN109933956B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005106236A1 (en) * | 2004-03-30 | 2005-11-10 | Menard, Inc. | Induction system for an internal combustion engine |
| CN107270979A (en) * | 2017-05-18 | 2017-10-20 | 东方电气集团东方汽轮机有限公司 | A kind of aerodynamic testing air-flow measurement device |
| CN108412618A (en) * | 2018-04-17 | 2018-08-17 | 中国人民解放军国防科技大学 | Hypersonic/supersonic axisymmetric inlet lip and design method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 《进气流量管喇叭口型面设计气动性能数值模拟研究》;王安妮 等;《第九届中国航空学会青年科技论坛论文集》;20201117;全文 * |
| 埋入式进气道设计;郭荣伟等;《南京航空航天大学学报》;20010330(第01期);全文 * |
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