CN108426554A - A kind of impeller blade streamline detection device and its working method - Google Patents
A kind of impeller blade streamline detection device and its working method Download PDFInfo
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- CN108426554A CN108426554A CN201810553511.4A CN201810553511A CN108426554A CN 108426554 A CN108426554 A CN 108426554A CN 201810553511 A CN201810553511 A CN 201810553511A CN 108426554 A CN108426554 A CN 108426554A
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- 238000001514 detection method Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000005259 measurement Methods 0.000 claims abstract description 82
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims abstract description 12
- 230000005540 biological transmission Effects 0.000 claims abstract description 4
- 238000013461 design Methods 0.000 claims description 8
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- 238000010586 diagram Methods 0.000 description 5
- 238000012545 processing Methods 0.000 description 4
- 229920003266 Leaf® Polymers 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
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- 238000005253 cladding Methods 0.000 description 1
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
- G01B21/08—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness for measuring thickness
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
Abstract
The present invention relates to a kind of impeller blade streamline detection device and its working methods,Impeller blade streamline detection device includes three coordinate detectors,Seat and gauge head are surveyed in Reinshaw rotation,Pressure sensor,Wherein three coordinate detectors include the X-axis mobile mechanism for measuring pedestal and being placed on measurement pedestal,Y-axis moving mechanism,Z axis mobile mechanism and connecting seat,Reinshaw rotation surveys seat through connecting seat and X-axis mobile mechanism,Y-axis moving mechanism,The transmission cooperation of Z axis mobile mechanism,So that Reinshaw rotation is surveyed seat and can be moved in the three dimensions on measuring pedestal,Impeller to be measured is fixedly installed in the measurement space of three coordinate detectors,Gauge head is rotatably provided in the front end that seat is surveyed in Reinshaw rotation,Pressure sensor is placed in the front end of gauge head,So that gauge head can stretch between the blade of impeller,Pressure sensor can measure the point coordinates of blade with when blade contact.
Description
Technical field
The present invention relates to engine impeller detection technique field, especially a kind of impeller blade streamline detection device and its work
Make method.
Background technology
Critical component of the impeller as engine, workmanship directly affect the aerodynamic quality and machinery of engine
Efficiency, therefore its detection becomes the important link of control engine quality；Impeller can be divided into wheel hub curved surface and spoon of blade two
Point, the general type that part is constituted is to wait linear leafs or size interlaced leaves to be evenly distributed on wheel hub curved surface by several.Blade
Curved surface includes cladding curved surface, pressure curved surface and suction curved surface again, is all made of non-extended straight-line surface and free form surface.
With the rapid industrial development in our country, the requirement to aero-engine performance is higher and higher, the essence measured impeller
Degree, mode and evaluation become increasingly to weigh.Aero-engine impeller goes out the parameter of impeller by computer software design when manufacturing
Model completes product processing by casting and machining, obtains whether impeller parameters meet design requirement, especially leaf after processing
The thickness and form parameter of piece, directly affect the performance of aero-engine；Therefore a kind of impeller blade inspection of simple and direct practicality is proposed
The detection method of measurement equipment and impeller parameters directly and accurately determines thickness value, location parameter and its mistake of tested impeller blade
The parameters such as difference are the technical issues of those skilled in the art are badly in need of solving.
Invention content
The technical problem to be solved in the present invention is to provide a kind of simple and convenient, highly practical impeller blade streamline detections to set
Standby and its working method.
In order to solve the above technical problems, impeller blade streamline detection device provided by the invention, including three coordinate detectors,
Seat and gauge head, pressure sensor are surveyed in Reinshaw rotation, wherein three coordinate detectors include measuring pedestal and being placed in measure on pedestal
X-axis mobile mechanism, Y-axis moving mechanism, Z axis mobile mechanism and connecting seat, Reinshaw rotation surveys seat and moved through connecting seat and X-axis
Mechanism, Y-axis moving mechanism, the transmission cooperation of Z axis mobile mechanism so that seat is surveyed in Reinshaw rotation can be in the three-dimensional space on measuring pedestal
Interior movement, impeller to be measured are fixedly installed in the measurement space of three coordinate detectors, and gauge head is rotatably provided in thunder Buddhist nun
The front end of seat is surveyed in the rotation that continues, and pressure sensor is placed in the front end of gauge head, so that gauge head can stretch between the blade of impeller, pressure passes
Sensor can measure the point coordinates of blade with when blade contact.
The working method of above-mentioned impeller blade streamline detection device, principle are that tested impeller is put into three coordinate detectors
Measurement space, obtain the space coordinate for being tested multiple corresponding points on suction curved surface and pressure curved surface on impeller blade, further according to
The coordinate value of corresponding points is calculated, and thickness value, location parameter and its error of tested impeller blade at this point are found out.
Further, the working method of the impeller blade streamline detection device, includes the following steps：
A, the threedimensional model of impeller is generated according to the design parameter of impeller using computer.
B, the outer meridian plane of impeller is extracted in threedimensional model, and rotation acquisition rotation is bent after impeller axial movement by it
Face, the surface of revolution suction surface streamline corresponding with blade suction curved surface, the acquisition of pressure surface intersection, pressure face streamline respectively,
Extract the parameter of suction surface streamline, pressure face streamline.
C, according to the parameter of suction surface streamline, pressure face streamline, determination is more respectively on suction surface streamline, pressure face streamline
A measurement point, the measurement point on suction surface streamline, pressure face streamline are located at blade both sides and one-to-one correspondence, extract each measurement
The theoretical coordinate value of point and theoretical normal vector can get blade in measurement point by the theoretical coordinate value of corresponding measurement point
Theoretic throat.
D, step B and step C is repeated, multigroup suction surface streamline, pressure face streamline, each suction surface streamline, pressure face are obtained
Multiple measurement points are equally determined on streamline.
E, impeller to be measured is placed in three coordinate detectors, the design parameter of impeller is read in by three coordinate detectors,
Establishing three-coordinate makes the coordinate origin of impeller, direction identical as the coordinate origin of three coordinate detectors, direction, and gauge head is stretched
Enter impeller, the mobile route of gauge head is planned by suction surface streamline, according to the theoretical coordinate value and reason of measurement point on suction surface streamline
It is moved on suction curved surface by normal vector driving gauge head, when the pressure sensor and blade contact of gauge head, three coordinate detectors
The actual coordinate value for obtaining measurement point, the measurement of the actual coordinate value of each measurement point on suction curved surface is completed by gauge head one by one.
F, after the actual coordinate value of the measurement point on suction curved surface is measured, gauge head is moved to the pressure curved surface of impeller
Side is planned the mobile route of gauge head by pressure face streamline, according to the theoretical coordinate value and theory method of measurement point on pressure face streamline
It is moved on pressure curved surface to vector driving gauge head, when the pressure sensor and blade contact of gauge head, three coordinate detectors obtain
The actual coordinate value of measurement point is completed the measurement of the actual coordinate value of each measurement point on the pressure curved surface by gauge head one by one.
G, the actual coordinate value of each measurement point on the suction curved surface measured is compared with corresponding theoretical coordinate value, it can
Obtain the shape difference situation of suction curved surface；By the actual coordinate value of each measurement point on the pressure curved surface measured and corresponding theory
Coordinate value is compared, and can get the shape difference situation of pressure curved surface；It is measured according to corresponding on suction curved surface and pressure curved surface
The actual coordinate value of point can get the actual (real) thickness of the measurement point, is compared, can obtain with the theoretic throat of the measurement point
Obtain the depth information of blade.
Further, the suction surface streamline quantity on the suction curved surface is 9, the distance between adjacent two suction surfaces streamline
Equal, the pressure face streamline quantity on the pressure curved surface is 9, and the distance between adjacent two pressure faces streamline is equal, so that
Measurement point distribution more uniformly.
Further, the spacing between each suction surface streamline, adjacent two measurement point on pressure face streamline is equal, so as to measure
Point is distributed more uniform.
Further, the gauge head joins end to end setting along the mobile route of adjacent two suction surfaces streamline, so that gauge head is before
One suction surface streamline enters latter suction surface streamline tail end after being from first to last measured starts to measure；The gauge head is along adjacent
The mobile route of two pressure face streamlines joins end to end setting, so that gauge head is after previous pressure face streamline is from first to last measured
Tail end into latter pressure face streamline starts to measure, and to shorten the stroke of gauge head, improves measurement efficiency.
The technique effect of invention：（1）The impeller blade streamline detection device of the present invention, compared with the existing technology, by impeller
It is placed in three coordinate detectors, according to the design parameter of impeller, a plurality of stream is chosen respectively in pressure curved surface, the suction curved surface of blade
Line is chosen multiple measurement points corresponding two-by-two on each streamline, is measured to the coordinate value of each measurement point using gauge head, pass through ratio
To the difference of actual coordinate value and theoretical coordinate value, the shape difference of blade can be analyzed；By to corresponding survey two-by-two
The actual coordinate value of amount point is calculated, can in the hope of the practical wall thickness of measurement point, according to practical wall thickness and theoretical wall thickness it
Between difference, blade can be modified；Using corresponding streamline and measurement point are arranged on two N-Side surfs of blade, realize
The streamline of vane thickness measures, and can guarantee that the feed path of processing is consistent with the measuring route of three coordinates and impeller sculpting method
Unanimously, and real-time display error and output, technologist, which can quickly judge and adjust machining path, ensures processing quality.
Description of the drawings
Invention is further described in detail with reference to the accompanying drawings of the specification：
Fig. 1 is the dimensional structure diagram of impeller blade streamline detection device；
Fig. 2 is the three-dimensional model diagram of impeller；
Fig. 3 is the schematic diagram of pressure face streamline on blade；
Fig. 4 is the schematic diagram of the grid in length and breadth and normal vector that are generated according to actual coordinate value；
Fig. 5 is the measurement result display schematic diagram of three coordinate detectors.
In figure：It is vented cincture disk 11, leading edge wheel disc 12, axis hole 13, twisted blade 14, splitterr vanes 15, pressure curved surface
16, outer meridian plane 17, suction curved surface 18, suction surface streamline 21, measurement pedestal 31, X-axis mobile mechanism 32, Y-axis moving mechanism 33,
Seat 36, gauge head 37 are surveyed in Z axis mobile mechanism 34, connecting seat 35, rotation.
Specific implementation mode
Embodiment 1
The impeller blade streamline detection device of the present embodiment, as shown in Figure 1, surveying seat including three coordinate detectors, Reinshaw rotation
36 and gauge head 37, pressure sensor, wherein three coordinate detectors include measuring pedestal 31 and being placed in the X-axis movement measured on pedestal
Mechanism 32, Y-axis moving mechanism 33, Z axis mobile mechanism 34 and connecting seat 35, Reinshaw rotation survey seat 36 through connecting seat 35 and X-axis
Mobile mechanism 32, Y-axis moving mechanism 33, the transmission cooperation of Z axis mobile mechanism 34 so that seat 36 is surveyed in Reinshaw rotation to measure bottom
Direction movement in three dimensions on seat 31, impeller to be measured are fixedly installed in the measurement space of three coordinate detectors, are surveyed
First 37 are rotatably provided in the front end that seat 36 is surveyed in Reinshaw rotation, and pressure sensor is placed in the front end of gauge head 37, so that gauge head 37
It can stretch between the blade of impeller, pressure sensor can measure the point coordinates of blade with when blade contact；Wherein three sit
Marking detector uses DMIS Survey Softwares, rotation to survey the model Reinshaw PH10M of seat, and pressure sensor is PH6 sensors.
Embodiment 2
The working method of impeller blade streamline detection device in embodiment 1, principle are that tested impeller is put into the inspection of three coordinates
The measurement space of instrument is surveyed, the space coordinate for being tested multiple corresponding points on suction curved surface and pressure curved surface on impeller blade is obtained, then
It is calculated according to the coordinate value of corresponding points, finds out thickness value, location parameter and its error of tested impeller blade at this point.
As shown in Fig. 2, the centrifugal impeller of certain aero-engine includes exhaust cincture disk 11 and air inlet cincture disposed in parallel
Disk 12, the centrally disposed axis hole 13 of exhaust cincture disk 11 and leading edge wheel disc 12, exhaust cincture disk 11 and leading edge wheel disc 12 it
Between multiple fairshaped twisted blades 14 are set, and splitterr vanes 15, twisted blade 14 are set between adjacent twisted blade 14
Two sides be respectively pressure curved surface 16 and suction curved surface 18, the top intersection of pressure curved surface 16 and suction curved surface 18 is my husband
Noon face 17, splitterr vanes 15 equally include pressure curved surface, suction curved surface and outer meridian plane, streamline shape with twisted blade 14 not
Together.
By taking centrifugal impeller detection as an example, the working method of above-mentioned impeller blade streamline detection device specifically includes as follows
Step：
A, the threedimensional model of centrifugal impeller is generated according to the design parameter of impeller using computer.
B, the outer meridian plane of centrifugal impeller is extracted in threedimensional model, and it is rotated after centrifugal impeller axial movement and is obtained
Surface of revolution is obtained, is obtained as shown in figure 3, the surface of revolution intersects with the suction curved surface 18 of twisted blade 14, pressure curved surface 16 respectively
Obtain corresponding suction surface streamline 21, pressure face streamline（It is not shown in figure）, extract the parameter of suction surface streamline, pressure face streamline.
C, according to the parameter of suction surface streamline, pressure face streamline, 50 are determined respectively on suction surface streamline, pressure face streamline
A measurement point, the spacing between adjacent two measurement point on each suction surface streamline, pressure face streamline is equal, suction surface streamline, pressure
Measurement point on power surface current line is located at 14 both sides of twisted blade and one-to-one correspondence, extract each measurement point theoretical coordinate value and
Theoretical normal vector, by the theoretical coordinate value of corresponding measurement point can get twisted blade 14 measurement point theoretic throat.
D, step B and step C is repeated, 9 groups of suction surface streamlines, pressure face streamline, wherein the pressure surface current of the top are obtained
Line, distance of the suction surface streamline apart from outer meridian plane 17 are 0.5mm, in the pressure face streamline of bottom, suction surface streamline distance
The distance of meridian plane is 0.5mm, and the distance between adjacent two suction surfaces streamline is equal, between adjacent two pressure faces streamline away from
From equal, equally determining 50 measurement points on each suction surface streamline, pressure face streamline.
E, impeller to be measured is placed in three coordinate detectors, the design that centrifugal impeller is read in by three coordinate detectors is joined
Number, establishes three-coordinate and makes the coordinate origin of centrifugal impeller, direction identical as the coordinate origin of three coordinate detectors, direction,
The suction curved surface side that gauge head is stretched into the twisted blade of centrifugal impeller plans the mobile route of gauge head according to suction surface streamline,
It drives gauge head to be moved on suction curved surface by the theoretical coordinate value and theoretical normal vector of measurement point on suction surface streamline, works as gauge head
Pressure sensor and twisted blade 14 when contacting, three coordinate detectors obtain the actual coordinate value of measurement point, one by one by gauge head
Complete the measurement of the actual coordinate value of each measurement point on suction curved surface.
F, after the actual coordinate value of the measurement point on suction curved surface is measured, gauge head is moved to the pressure of centrifugal impeller
Curved sides plan the mobile route of gauge head according to pressure face streamline, by the theoretical coordinate value and reason of measurement point on pressure face streamline
It is moved on pressure curved surface by normal vector driving gauge head, when the pressure sensor of gauge head is contacted with twisted blade, three coordinates
Detector obtains the actual coordinate value of measurement point, completes the survey of the actual coordinate value of each measurement point on pressure curved surface one by one by gauge head
Amount.
G, the actual coordinate value of each measurement point on the suction curved surface measured is compared with corresponding theoretical coordinate value, it can
The shape difference situation for obtaining suction curved surface, by the actual coordinate value of each measurement point on the pressure curved surface measured and corresponding theory
Coordinate value is compared, and can get the shape difference situation of pressure curved surface, can according to the actual coordinate value of each independent reference axis with
Difference between theoretical coordinate value, judges whether suction curved surface or pressure curved surface deviate on corresponding axis；According to suction song
The actual coordinate value that measurement point is corresponded on face and pressure curved surface can get the actual (real) thickness of the measurement point, with the measurement point
Theoretic throat is compared, and can get the thickness deviation of blade.
Streamline division, selection of measuring point, practical measurement on splitterr vanes is identical as the measurement method of twisted blade, herein
No longer it is described in detail.
Three coordinates are for the part containing free form surface structure（Such as centrifugal impeller）The measurement data for measuring record is all to survey
The position at head center is not the coordinate of gauge head and testee contact point, which must be obtained by compensation, and current three sit
Measurement point and the relationship of gauge head radius are all processed into two-dimentional compensation by mark experiment curv, and the actually surface normal vector of measurement point
Amount usually and surveys axis not in the same plane, it is necessary to carry out three-dimensional compensation, there are many method that can realize three-dimensional compensation, we adopt
It is the radius compensation method that principle is simple and calculation amount is small, first makes in the points of every measurement streamline, direction unanimously, shape
At grid in length and breadth, the tangent vector of vertical and horizontal is sought refinement point using the method for interpolation derivation, tangent vector is recycled to seek normal direction
Probe-radius Compensation in Reserve is measured and carries out, the grid in length and breadth of acquisition is as shown in Figure 4.
Preferably, gauge head joins end to end setting along the mobile route of adjacent two suction surfaces streamline, so that gauge head is along previous
Suction surface streamline enters latter suction surface streamline tail end after being from first to last measured starts to measure；Gauge head is along adjacent two pressure
The mobile route of surface current line joins end to end setting so that gauge head along previous pressure face streamline be from first to last measured after enter after
The tail end of one pressure face streamline starts to measure, and to shorten the stroke of gauge head, improves measurement efficiency.
Preferably, the data that three coordinate detectors measure can directly be shown, and theoretical coordinate value, reality are shown simultaneously
Border coordinate value and error amount can easily observe the data of each measurement point, as shown in Figure 5；It can utilize and calculate simultaneously
The data summarization measured is formed table and exported by machine software, realizes record in real time.
Obviously, the above embodiment is merely an example for clearly illustrating the present invention, and is not to the present invention
The restriction of embodiment.For those of ordinary skill in the art, it can also be made on the basis of the above description
Its various forms of variation or variation.There is no necessity and possibility to exhaust all the enbodiments.And these belong to this hair
Bright spiritual changes and variations that derived from are still in the protection scope of this invention.
Claims (6)
1. a kind of impeller blade streamline detection device, which is characterized in that survey seat and survey including three coordinate detectors, Reinshaw rotation
Head, pressure sensor, wherein three coordinate detectors include measuring pedestal and being placed in the X-axis mobile mechanism measured on pedestal, Y-axis shifting
Motivation structure, Z axis mobile mechanism and connecting seat, Reinshaw rotation survey seat through connecting seat and X-axis mobile mechanism, Y-axis moving mechanism, Z
Axis mobile mechanism transmission cooperation so that Reinshaw rotation is surveyed seat and can be moved in the three dimensions on measuring pedestal, to be measured
Impeller is fixedly installed in the measurement space of three coordinate detectors, and gauge head is rotatably provided in the front end that seat is surveyed in Reinshaw rotation,
Pressure sensor is placed in the front end of gauge head, so that gauge head can stretch between the blade of impeller, when pressure sensor is with blade contact
The point coordinates of blade can be measured.
2. the working method of impeller blade streamline detection device according to claim 1, which is characterized in that its principle be by
Tested impeller is put into the measurement space of three coordinate detectors, obtain be tested it is multiple on suction curved surface and pressure curved surface on impeller blade
The space coordinate of corresponding points is calculated further according to the coordinate value of corresponding points, finds out the thickness of tested impeller blade at this point
Value, location parameter and its error.
3. the working method of impeller blade streamline detection device according to claim 2, which is characterized in that including walking as follows
Suddenly：
A, the threedimensional model of impeller is generated according to the design parameter of impeller using computer；
B, the outer meridian plane of impeller is extracted in threedimensional model, and rotation obtains surface of revolution after impeller axial movement by it,
The surface of revolution suction surface streamline corresponding with blade suction curved surface, the acquisition of pressure surface intersection, pressure face streamline respectively, extraction
The parameter of suction surface streamline, pressure face streamline；
C, according to the parameter of suction surface streamline, pressure face streamline, multiple surveys are determined respectively on suction surface streamline, pressure face streamline
Point is measured, the measurement point on suction surface streamline, pressure face streamline is located at blade both sides and one-to-one correspondence, extracts each measurement point
Theoretical coordinate value and theoretical normal vector, by the theoretical coordinate value of corresponding measurement point can get blade measurement point theory
Thickness；
D, step B and step C is repeated, multigroup suction surface streamline, pressure face streamline, each suction surface streamline, pressure face streamline are obtained
On equally determine multiple measurement points；
E, impeller to be measured is placed in three coordinate detectors, the design parameter of impeller is read in by three coordinate detectors, established
Three-coordinate makes the coordinate origin of impeller, direction identical as the coordinate origin of three coordinate detectors, direction, and gauge head is stretched into leaf
Wheel is planned the mobile route of gauge head by suction surface streamline, according to the theoretical coordinate value and theory method of measurement point on suction surface streamline
It is moved on suction curved surface to vector driving gauge head, when the pressure sensor and blade contact of gauge head, three coordinate detectors obtain
The actual coordinate value of measurement point is completed the measurement of the actual coordinate value of each measurement point on suction curved surface by gauge head one by one；
F, after the actual coordinate value of the measurement point on suction curved surface is measured, gauge head is moved to the pressure curved sides of impeller,
The mobile route that gauge head is planned by pressure face streamline is sweared according to the theoretical coordinate value of measurement point on pressure face streamline and theoretical normal direction
Amount driving gauge head moves on pressure curved surface, and when the pressure sensor and blade contact of gauge head, three coordinate detectors are measured
The actual coordinate value of point, the measurement of the actual coordinate value of each measurement point on the pressure curved surface is completed by gauge head one by one；
G, the actual coordinate value of each measurement point on the suction curved surface measured is compared with corresponding theoretical coordinate value, is can get
The shape difference situation of suction curved surface；By the actual coordinate value of each measurement point on the pressure curved surface measured and corresponding theoretical coordinate
Value is compared, and can get the shape difference situation of pressure curved surface；Measurement point is corresponded to according on suction curved surface and pressure curved surface
Actual coordinate value can get the actual (real) thickness of the measurement point, is compared with the theoretic throat of the measurement point, can get leaf
The depth information of piece.
4. the working method of impeller blade streamline detection device according to claim 3, which is characterized in that the suction is bent
Suction surface streamline quantity on face is 9, and the distance between adjacent two suction surfaces streamline is equal, the pressure on the pressure curved surface
Surface current line number amount is 9, and the distance between adjacent two pressure faces streamline is equal.
5. the working method of impeller blade streamline detection device according to claim 4, which is characterized in that each suction surface current
The spacing between adjacent two measurement point on line, pressure face streamline is equal.
6. the working method of impeller blade streamline detection device according to claim 5, which is characterized in that the gauge head edge
The mobile route of adjacent two suction surfaces streamline joins end to end setting, so that gauge head has from first to last been measured along previous suction surface streamline
Start to measure at the rear tail end into latter suction surface streamline；Mobile route head and the tail of the gauge head along adjacent two pressure faces streamline
Be connected setting so that gauge head along previous pressure face streamline be from first to last measured after enter latter pressure face streamline tail end open
Begin to measure.
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