CN114320681B - Air inlet pipe assembly and optimization method and measuring device thereof - Google Patents
Air inlet pipe assembly and optimization method and measuring device thereof Download PDFInfo
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- CN114320681B CN114320681B CN202210261352.7A CN202210261352A CN114320681B CN 114320681 B CN114320681 B CN 114320681B CN 202210261352 A CN202210261352 A CN 202210261352A CN 114320681 B CN114320681 B CN 114320681B
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Abstract
The invention provides an air inlet pipe assembly, an optimization method thereof and a measuring device, wherein the air inlet pipe assembly comprises an air inlet pipe body, the air inlet pipe body is provided with an air inlet and an air outlet which are sequentially arranged along the extending direction of the air inlet pipe body, at least one flow deflector is arranged in the air inlet pipe body, each flow deflector is arranged between the air inlet and the air outlet, and each flow deflector is detachably connected with the air inlet pipe body; each flow deflector is connected with the air inlet pipe body through an adjusting structure, the adjusting structure comprises a rotating part, the rotating part is rotatably arranged, and the rotating part is connected with the flow deflector. The air inlet pipe assembly solves the problems that in the prior art, the guide vanes are additionally arranged in the bent pipe, the guide vanes cannot be adjusted and need to be opened again, time consumption is long, and cost is high.
Description
Technical Field
The invention relates to the technical field of engines, in particular to an air inlet pipe assembly and an optimization method and a measuring device thereof.
Background
In order to improve the flow distribution of each cylinder and reduce the length of the whole engine, the vehicle engine mostly adopts a middle air inlet mode. The middle air inlet mode inevitably uses an air inlet bent pipe to bend the air flow by 90 degrees and then lead the air flow into an air inlet pressure stabilizing cavity.
Due to space limitation, the existing air inlet bent pipe is often short in length and large in bending, after air flow enters the bent pipe, due to the fact that the bending distance is short and the bending angle is large, the air flow flows along the outer side of the bent pipe due to inertia, backflow vortex is formed on the inner side of the bent pipe, the outer flow of the outlet section is obviously higher than the inner flow, the inner side and the outer side of the outlet section are unevenly distributed, and then the air inlet flow of each cylinder on two sides is influenced. The existence of the backflow vortex reduces the actual flow area of the air inlet elbow, thereby increasing the air inlet pressure loss.
To improve the flow distribution at the outlet of the inlet elbow, baffles may be added to the interior of the elbow. However, the angle, the number and the shape of the partition plates are difficult to determine, and if a plurality of tests are carried out, a new die and a sample piece are required to be processed, so that the cost is high and the time is long.
Disclosure of Invention
The invention mainly aims to provide an air inlet pipe assembly, an optimization method and a measuring device thereof, and aims to solve the problems that in the prior art, a flow deflector is added in a bent pipe, the flow deflector cannot be adjusted, the mold opening is required again, the time consumption is long, and the cost is high.
In order to achieve the above object, according to one aspect of the present invention, there is provided an intake manifold assembly, including an intake manifold body, the intake manifold body having an air inlet and an air outlet arranged in sequence along an extending direction thereof, at least one flow deflector being provided in the intake manifold body, each flow deflector being provided between the air inlet and the air outlet, each flow deflector being detachably connected to the intake manifold body; each flow deflector is connected with the air inlet pipe body through an adjusting structure, the adjusting structure comprises a rotating part, the rotating part is rotatably arranged, and the rotating part is connected with the flow deflectors.
Furthermore, the rotating part comprises a first connecting rod, and the first connecting rod is connected with the first end of the flow deflector; the regulation structure still includes: the cover plate is covered on the opening of the air inlet pipe body, and a first communication hole and a positioning hole are formed in the cover plate; the adjusting plate is provided with a plurality of adjusting through holes which are arranged at intervals along the circumferential direction of the adjusting plate; the first connecting rod penetrates through the first connecting hole to be connected with the adjusting disc; the first locking piece is inserted in one adjusting through hole and the positioning hole.
Furthermore, the rotating part comprises a second connecting rod, the second connecting rod is connected with the second end of the flow deflector, and the second connecting rod penetrates through the air inlet pipe body; the regulation structure still includes: the second retaining member, with second connecting rod threaded connection, the second connecting rod passes through the locking of second retaining member and intake pipe body.
Further, this internal a plurality of water conservancy diversion pieces that are provided with of intake pipe, a plurality of water conservancy diversion pieces arrange in proper order along the extending direction of intake pipe body.
According to another aspect of the present invention, there is provided an intake duct assemblyThe optimization method is suitable for the air inlet pipe assembly, and comprises the following steps: obtaining a velocity of an outlet cross-section of an air outlet of the air inlet pipe assembly and a first pressure loss dp of the air inlet pipe assembly 1 (ii) a Adjusting at least one of an angle, a number, and a shape of a baffle of the intake pipe assembly, and acquiring a speed of an outlet section of the adjusted intake pipe assembly and a second pressure loss dp of the adjusted intake pipe assembly 2 (ii) a And selecting the air inlet pipe assembly with the optimized structure according to the speed distribution and the pressure loss of the outlet section of the air inlet pipe assembly before and after adjustment.
Furthermore, the outlet section is symmetrically arranged relative to at least one symmetry line, and the outlet section is divided into a plurality of sections by the at least one symmetry line; the method for obtaining the structurally optimized air inlet pipe assembly according to the speed distribution and the pressure loss of the outlet cross section of the air inlet pipe assembly before and after adjustment comprises the following steps: calculating the speed average value of each section, calculating the standard deviation x of the speed average values of a plurality of sections, and calculating a first quantization score according to a formula 35-15/(1-x); calculating the speed uniformity y of each section, and calculating a second quantization score of each section according to a formula of 20-10/y; calculating dp 2 /dp 1 When dp 2 >dp 1 According to the formula-220 + 220/(dp) 2 /dp 1 ) Calculating a third quantization score, when dp 2 <dp 1 According to the formula 220- 2 /dp 1 ) Calculating a third quantization score; and summing the first quantitative score, the plurality of second quantitative scores and the third quantitative score of the air inlet pipe assembly before adjustment to obtain a first total value, summing the first quantitative score, the plurality of second quantitative scores and the third quantitative score of the air inlet pipe assembly after adjustment to obtain a second total value, and optimizing the structure of the air inlet pipe assembly corresponding to the maximum numerical value in the first total value and the second total value.
According to still another aspect of the present invention, there is provided a measuring apparatus, wherein the method for optimizing an intake pipe assembly described above is applied, the measuring apparatus comprising: the first measuring component is used for measuring the speed at the air outlet of the air inlet pipe body of the air inlet pipe assembly; and a second measuring part for measuring a pressure loss of the intake pipe assembly.
Further, the measuring device still includes the mechanism of admitting air, and the mechanism of admitting air includes: a fan; the first end of pipeline subassembly is used for being linked together with the fan, and the second end of pipeline subassembly is used for being linked together with the air inlet of intake pipe body.
Further, the air inlet mechanism further comprises a frequency converter, and the frequency converter is connected with the fan.
Further, the piping component includes: a first surge tank; the second pressure stabilizing box is positioned on one side of the first pressure stabilizing box far away from the fan; the flow meter is arranged between the first pressure stabilizing box and the second pressure stabilizing box; and the pressure sensor is arranged on the second pressure stabilizing box.
Further, the measuring device further includes: a support table; the second end of the transition connecting pipe is used for being connected with the air inlet pipe assembly and communicated with the air inlet; and a first end of the air outlet pipe is connected with the first end of the pipeline assembly, and a second end of the air outlet pipe is connected with the first end of the transition connecting pipe.
Further, the first measuring component is a laser doppler velocimeter.
The air inlet pipe assembly comprises an air inlet pipe body, wherein the air inlet pipe body is provided with an air inlet and an air outlet which are sequentially arranged along the extending direction of the air inlet pipe body, at least one flow deflector is arranged in the air inlet pipe body, each flow deflector is arranged between the air inlet and the air outlet, the flow distribution of the air outlet is improved due to the arrangement of the flow deflectors, partial air flow is guided, the flow on the two sides of a bent pipe is balanced, the flow uniformity of the outlet of the bent pipe is improved, the actual flow area is increased, and the pressure loss is reduced. Each flow deflector of the air inlet pipe assembly is detachably connected with the air inlet pipe body, the number of the flow deflectors arranged in the air inlet pipe body can be selected, and the flow deflectors with different shapes can be replaced; and the rotating part is connected with the guide vane, and the angle of the guide vane in the air inlet pipe body is changed by rotating the rotating part, so that the guide vane is adjustable, a mold does not need to be opened again, a sample piece does not need to be processed, and the time consumption is short and the cost is low.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 illustrates an isometric view of an embodiment of an intake air duct assembly according to the present invention;
FIG. 2 illustrates a front view of an embodiment of an intake air duct assembly according to the present invention;
FIG. 3 illustrates an isometric view of a cover plate of an intake air duct assembly according to the present invention;
FIG. 4 shows an isometric view of an adjustment dial of an intake air duct assembly according to the present invention;
fig. 5 shows an isometric view of an embodiment of a measuring device according to the invention;
FIG. 6 shows a partial cross-sectional view of an embodiment of a measuring device according to the invention;
FIG. 7 shows a top view of a part of the structure of an embodiment of a measuring device according to the invention;
fig. 8 shows a schematic view of an embodiment of the measuring device according to the invention.
Wherein the figures include the following reference numerals:
10. an air inlet pipe body; 11. an air inlet; 12. an air outlet; 13. an opening; 20. a flow deflector; 30. a rotating member; 31. a first connecting rod; 32. a second connecting rod; 40. a cover plate; 41. a first communication hole; 42. positioning holes; 43. a first shoulder; 44. a second shoulder; 50. an adjusting disk; 51. adjusting the through hole; 60. a first locking member; 70. a second locking member; 80. a first measuring member; 81. a one-dimensional test probe; 82. a two-dimensional test probe; 83. a light splitter; 100. a fan; 110. a piping component; 111. a first surge tank; 112. a second surge tank; 113. a flow meter; 114. a pressure sensor; 115. a plastic bellows; 120. a frequency converter; 130. a support table; 140. an air outlet pipe; 150. a transition connecting pipe; 160. collecting an instrument; 170. a computer; 180. a base; 190. an electric motor.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The invention provides an air inlet pipe assembly, please refer to fig. 1 to 4, which comprises an air inlet pipe body 10, wherein the air inlet pipe body 10 is provided with an air inlet 11 and an air outlet 12 which are sequentially arranged along the extending direction of the air inlet pipe body, at least one flow deflector 20 is arranged in the air inlet pipe body 10, each flow deflector 20 is arranged between the air inlet 11 and the air outlet 12, and each flow deflector 20 is detachably connected with the air inlet pipe body 10; each guide vane 20 is connected with the air inlet pipe body 10 through an adjusting structure, the adjusting structure comprises a rotating part 30, the rotating part 30 is rotatably arranged, and the rotating part 30 is connected with the guide vanes 20.
The air inlet pipe assembly comprises an air inlet pipe body 10, the air inlet pipe body 10 is provided with an air inlet 11 and an air outlet 12 which are sequentially arranged along the extending direction of the air inlet pipe body, at least one flow deflector 20 is arranged in the air inlet pipe body 10, each flow deflector 20 is arranged between the air inlet 11 and the air outlet 12, the flow distribution of the air outlet is improved due to the arrangement of the flow deflectors 20, partial air flow is guided, the flow on the two sides of a bent pipe is balanced, the flow uniformity of the outlet of the bent pipe is improved, the actual flow area is increased, and the pressure loss is reduced. Each flow deflector 20 of the air inlet pipe assembly is detachably connected with the air inlet pipe body 10, the number of the flow deflectors 20 arranged in the air inlet pipe body 10 can be selected, and the flow deflectors 20 with different shapes can be replaced; moreover, the rotating part 30 is connected with the baffle 20, and the angle of the baffle 20 in the air inlet pipe body 10 is changed by rotating the rotating part 30, so that the baffle 20 is adjustable, a mold does not need to be opened again, a sample is not required to be processed, and the time consumption is short and the cost is low.
This air inlet pipe subassembly mainly used solves the uneven problem of gas outlet flow that leads to by air current inertia and gas bending, realizes even export distribution, reduces each jar flow difference in both sides. And the problem that the pressure loss is increased due to the fact that the actual flow area is reduced caused by the inner side backflow vortex is solved. The problem that the die needs to be opened repeatedly when the test piece is changed is solved.
In this embodiment, the rotating member 30 includes a first connecting rod 31, and the first connecting rod 31 is connected to a first end of the guide vane 20; the adjustment structure further includes: a cover plate 40 covering the opening 13 of the air inlet pipe body 10, wherein the cover plate 40 is provided with a first communication hole 41 and a positioning hole 42; the adjusting plate 50 is provided with a plurality of adjusting through holes 51, and the adjusting through holes 51 are arranged at intervals along the circumferential direction of the adjusting plate 50; the first connecting rod 31 passes through the first connecting hole 41 and is connected with the adjusting disc 50; the first locking member 60 is inserted into one of the adjustment through-holes 51 and the positioning hole 42.
Optionally, the first locking member 60 is a locating pin.
Specifically, the first connecting rod 31 has a first shoulder 43, the cover plate 40 has a first step surface, and the first shoulder 43 abuts against the first step surface to position the assembly of the first connecting rod 31 and the cover plate 40.
Specifically, the adjustment disk 50 has a second shoulder 44, the cover plate 40 has a second step surface, and the second shoulder 44 abuts the first step surface to position the assembly of the adjustment disk 50.
In this embodiment, the rotating member 30 includes a second connecting rod 32, the second connecting rod 32 is connected to the second end of the baffle 20, and the second connecting rod 32 is disposed on the air inlet pipe body 10 in a penetrating manner; the adjustment structure further includes: and a second locking member 70 in threaded connection with the second connecting rod 32, wherein the second connecting rod 32 is locked with the air inlet pipe body 10 by the second locking member 70.
Specifically, the second locking member 70 is a nut.
In particular, the first connecting rod 31 and the second connecting rod 32 are both provided with threaded features.
Optionally, a plurality of flow deflectors 20 are disposed in the air inlet pipe body 10, and the plurality of flow deflectors 20 are sequentially arranged along the extending direction of the air inlet pipe body 10.
In specific implementation, the installation sequence is as follows: first, the first connecting rod 31 and the second connecting rod 32 are respectively connected to the baffle 20 and are fixed by a threaded connection. The combined body is fitted into the intake pipe body 10 through the opening 13. The cover plate 40 is then installed (the features of the lower surface of the cover plate 40 are similar to those of the inner surface of the air inlet pipe body 10 so as to minimize the influence of the adjusting device on the flow in the pipe), and the cover plate 40 is then fixed to the air inlet pipe body 10 through bolts and is pressed against the first shoulder so as to fix the combined body in the pipeline. Then, an adjusting disk 50 (having 6 through holes for 30 degree angle adjustment) is installed, and the second shoulder 44 thereof contacts the cover plate 40 and is in interference fit with the first connecting rod 31. The guide vane is then relatively rotationally positioned by inserting the alignment pin (i.e., first retaining member 60) into the pin hole in the cover plate 40. Finally, the nut (i.e., the second locking member 70) is installed, thereby achieving the fixation and sealing of the installed device.
When the relative angle of the baffle 20 with respect to the air inlet pipe body 10 needs to be adjusted, the second locking member 70 is only required to be loosened, the first locking member 60 is taken out, and the adjusting disk 50 is rotated, so that the assembly can also synchronously rotate due to the fact that the adjusting disk 50 and the assembly are in interference fit. After adjustment to the target angle, the first locking member 60 is inserted and then the second locking member 70 is installed to achieve fixation. And the angle is adjusted. If there are a plurality of guide vanes 20, the adjustment sequence is the same.
It should be noted that the shape, number, and angle of the guide vanes 20 can be changed, and the guide vanes 20 can be special-shaped guide vanes. Different designs of the guide vanes 20 can be modified by combining the guide vanes, so that repeated integral demolding is avoided, the processing difficulty of the sample piece is reduced, and the cost of the sample piece is reduced.
The invention also provides an optimization method of the air inlet pipe assembly, which is suitable for the air inlet pipe assembly in the embodiment, and the optimization method of the air inlet pipe assembly comprises the following steps: the speed of the outlet cross section of the air outlet 12 of the air inlet duct assembly and the first pressure loss dp of the air inlet duct assembly are obtained 1 (ii) a Adjusting at least one of an angle, a number and a shape of the guide vanes 20 of the intake pipe assembly, and acquiring a speed of an outlet section of the adjusted intake pipe assembly and a second pressure loss dp of the adjusted intake pipe assembly 2 (ii) a And selecting the air inlet pipe assembly with an optimized structure according to the speed distribution and the pressure loss of the outlet section of the air inlet pipe assembly before and after adjustment.
In specific implementation, after a group of guide vane combinations are determined, a first measuring component is arranged at the air outlet, and the three-dimensional speed and the pressure loss of the outlet section are measured. Then the guide vane combination is replaced, and the three-dimensional speed and the pressure loss of the outlet section are measured. And finding out a combination with better outlet speed uniformity and smaller pressure loss in various schemes, and preparing the integral casting drawing according to the optimal combination. The setting does not need to reopen the mould and process the sample piece, and has short time and low cost.
In this embodiment, the outlet cross-section is symmetrically arranged with respect to at least one symmetry line, which divides the outlet cross-section into a plurality of cross-sections; the method for obtaining the structurally optimized air inlet pipe assembly according to the speed distribution and the pressure loss of the outlet cross section of the air inlet pipe assembly before and after adjustment comprises the following steps: calculating the average speed value of each section, calculating the standard deviation x of the average speed values of a plurality of sections, and calculating a first quantization score according to the formula 35-15/1-x; calculating the speed uniformity y of each section, and calculating a second quantization score of each section according to a formula of 20-10/y; calculating dp 2 /dp 1 When dp 2 >dp 1 According to the formula-220 +220/dp 2 /dp 1 Calculating a third quantization score, when dp 2 <dp 1 According to the formula 220-220/2-dp 2 /dp 1 Calculating a third quantization score; the first quantitative score and the plurality of second quantitative scores of the air inlet pipe assembly before adjustment are calculatedAnd summing the third quantitative scores to obtain a first total value, summing the first quantitative score, the plurality of second quantitative scores and the third quantitative score of the adjusted air inlet pipe assembly to obtain a second total value, and optimizing the structure of the air inlet pipe assembly corresponding to the maximum value in the first total value and the second total value.
In particular, the average value of the velocities is the average value of the velocities of the various sections perpendicular to the outlet section.
Specifically, the standard deviation x is used to characterize the difference in total flow across multiple blocks; wherein the value range of x is 0-1. The scheme in which the first quantization score is negative is not used.
In particular, using formulas
And respectively obtaining the speed uniformity of the speed field on each section, wherein the speed uniformity is used for representing the speed uniformity on each section. Wherein the value range of y is 0-1. The scheme in which the second quantization score is negative is not used.
Specifically, schemes with a third quantization score below-20 are not used.
Specifically, the outlet cross-section is symmetrically disposed with respect to two lines of symmetry, which are perpendicular to each other, and the two lines of symmetry divide the outlet cross-section into four cross-sections.
In specific implementations, the first quantization score, the second quantization score, and the third quantization score are shown in the following table.
The present invention also provides a measuring device, please refer to fig. 5 to 8, which is applied to the optimization method of the intake pipe assembly in the above embodiment, and the measuring device includes: a first measuring part 80 for measuring a speed at the air outlet 12 of the air intake pipe body 10 of the air intake pipe assembly; and a second measuring part for measuring a pressure loss of the intake pipe assembly.
In this embodiment, the measuring apparatus further includes an air intake mechanism including: a fan 100; a pipeline assembly 110, a first end of the pipeline assembly 110 is used for communicating with the fan 100, and a second end of the pipeline assembly 110 is used for communicating with the air inlet 11 of the air inlet pipe body 10.
In this embodiment, the air inlet mechanism further includes a frequency converter 120, and the frequency converter 120 is connected to the fan 100. The rotational speed of the fan 100 is controlled by a frequency converter 120.
In this embodiment, the pipe assembly 110 includes: a first surge tank 111; the second pressure stabilizing box 112 is positioned on one side of the first pressure stabilizing box 111 far away from the fan 100; a flow meter 113 disposed between the first surge tank 111 and the second surge tank 112; and a pressure sensor 114 disposed on the second surge tank 112. First surge tank 111 and second surge tank 112 function to stabilize the air flow, and flow meter 113 is used to detect the flow rate in the tubes of manifold assembly 110.
Specifically, the second surge tank 112 and the flow meter 113 are flange-bolted, and the flow meter 113 and the first surge tank 111 are flange-bolted.
In this embodiment, the measuring apparatus further includes: a support table 130; the transition connecting pipe 150 is connected with the support table 130, and a second end of the transition connecting pipe 150 is used for being connected with the air inlet pipe assembly and communicated with the air inlet 11; and a first end of the outlet pipe 140 is connected to the first end of the pipe assembly 110, and a second end of the outlet pipe 140 is connected to the first end of the transition connection pipe 150. Such an arrangement may ensure that the measuring device has the capability of measuring intake manifold assemblies of different lengths and volumes.
Specifically, the transition connection tube 150 is adjustably disposed on the support table 130, the outlet tube 140 is a tapered tube, the small-diameter end of the tapered tube is connected to the tube assembly 110, and the outlet tube 140 is pressed against the support table 130 by the transition connection tube 150 through 4 bolts.
Specifically, the manifold assembly 110 includes a plastic bellows 115, a first end of the plastic bellows 115 being connected to the second plenum 112, and a second end of the plastic bellows 115 being connected to the outlet tube 140. The plastic bellows 115 is a hose, further improving the applicability of the measuring device. The plastic corrugated pipe 115 is connected with the air outlet pipe 140 through a clamp, and the plastic corrugated pipe 115 is connected with the second pressure stabilizing box 112 through a clamp.
In particular, the first measurement component 80 is a laser doppler velocimeter. Specifically, the laser doppler velocimeter includes a one-dimensional test probe 81, a two-dimensional test probe 82, and a beam splitter 83.
It should be noted that, the laser doppler velocimeter is adopted to measure the speed, namely, the LDA system is adopted to measure the speed, LDA: laser Doppler analysis, a Laser Doppler velocimetry technique, a non-contact optical testing method, which works based on the optical Doppler effect, is widely used for one-dimensional, two-dimensional, and three-dimensional measurements of velocity, turbulence, and their distribution.
In this embodiment, the measuring apparatus further includes a collector 160, the frequency converter 120, the flow meter 113 and the pressure sensor 114 are all connected to the collector 160, and the collector 160 is responsible for inputting and outputting signals. The flow meter 160 is connected to the computer 170, and the computer 170 is used for monitoring the flow rate of the pipeline assembly 110 and the pressure value in the second surge tank 112 and controlling the flow rate of the pipeline assembly 110 by controlling the frequency of the frequency converter 120.
In this embodiment, the measuring apparatus further includes a base 180, the fan blades of the fan 100 are driven by a motor 190 to rotate, and the motor 190 and the fan 100 are both disposed on the base 180. Such an arrangement improves the integrity of the measuring device.
Specifically, the motor 190 and the fan 100 are bolted to the base 180.
During the concrete implementation, before the test begins, install the intake pipe subassembly that awaits measuring on supporting bench 130 to pipeline around connecting well. And inputting a target flow, feeding the flow back to the computer through the flowmeter, and comparing the flow with the target flow. If the actual flow is smaller than the target flow, the frequency value of the frequency converter is automatically increased by a preset step length until the actual flow is equal to the target flow, and the frequency of the frequency converter is fixed at the moment. On the contrary, when the actual flow is larger than the target flow, the frequency value of the frequency converter is automatically reduced by the preset step length until the actual flow is equal to the target flow, and the frequency of the frequency converter is fixed at the moment. After the pressure value measured by the pressure sensor is stabilized, the recording of the flow rate through the manifold assembly 110 is resumed.
This application adds a plurality of apron 40 along intake pipe body 10 central line, and apron 40 is used for fixed water conservancy diversion piece 20, and the purpose carries out the water conservancy diversion to partial air current, and balanced return bend both sides flow improves return bend export flow homogeneity, and the increase actual flow area reduces the pressure loss. The number, angle and shape of the flow deflectors 20 are adjustable to realize various combinations, and the flow deflectors can be repeatedly used and meet the requirements of different bent pipes. The flow deflector 20 is convenient to process and simple to modify, repeated die sinking can be avoided, and the manufacturing cost of the test piece is greatly reduced. The selected combination is subjected to blowing experiments through a measuring device, three-dimensional speeds at different positions of the air ports are measured, the distribution uniformity of the speeds of the air ports is calculated through a specific algorithm, and the optimal group is selected and then used as a final part for drawing and processing.
The main disadvantages of the prior art are as follows: the air flow flows along the outer side of the elbow pipe due to the reasons of inertia, large bending angle and the like, and backflow vortex is generated on the inner side, so that flow distribution on the inner side and the outer side of the outlet is uneven, and the air inflow of cylinders on two sides is influenced. And (II) the existence of the inner side return vortex reduces the actual flow area of the airflow, and increases the intake pressure loss. And thirdly, the mold opening is required to be carried out again by adopting different flow deflector 20 schemes, so that the time consumption is long and the cost is high.
The key points of the concept of the application are as follows: and (I) a plurality of groups of adjusting structures exist on the outer wall of the elbow, and the guide vanes can be fixed through screws. And (II) the number, the angle and the shape of the flow deflectors can be freely adjusted, and the flow deflectors are connected with the outer wall through screws. And (III) monitoring the speed uniformity of the air outlet through a measuring device experiment after the flow deflectors are combined, and finding out the optimal combination.
The main advantages of the present application are as follows: the flow guide plate (I) has a flow guide effect, so that the speed unevenness of the outlet of the elbow is reduced. The number, the angle and the shape of the guide plates can be freely adjusted, and different samples can be changed by the guide plates. The processing difficulty of the sample piece is reduced, and the processing cost of the sample piece is reduced. And thirdly, measuring the outlet wind speed uniformity through LDA to obtain the optimal guide plate combination.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:
the air inlet pipe assembly comprises an air inlet pipe body 10, wherein the air inlet pipe body 10 is provided with an air inlet 11 and an air outlet 12 which are sequentially arranged along the extending direction of the air inlet pipe body, at least one flow deflector 20 is arranged in the air inlet pipe body 10, each flow deflector 20 is arranged between the air inlet 11 and the air outlet 12, the flow distribution of the air outlet is improved due to the arrangement of the flow deflectors 20, partial air flow is guided, the flow on the two sides of a bent pipe is balanced, the flow uniformity of the outlet of the bent pipe is improved, the actual flow area is increased, and the pressure loss is reduced. Each flow deflector 20 of the air inlet pipe assembly is detachably connected with the air inlet pipe body 10, the number of the flow deflectors 20 arranged in the air inlet pipe body 10 can be selected, and the flow deflectors 20 with different shapes can be replaced; moreover, the rotating part 30 is connected with the flow deflector 20, and the angle of the flow deflector 20 in the air inlet pipe body 10 is changed by rotating the rotating part 30, so that the flow deflector 20 is adjustable, a mold does not need to be opened again, a sample piece does not need to be processed, and the time consumption is short and the cost is low.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the accompanying drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged under appropriate circumstances such that, for example, embodiments of the application described herein may be implemented in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. An air inlet pipe assembly comprises an air inlet pipe body (10), wherein the air inlet pipe body (10) is provided with an air inlet (11) and an air outlet (12) which are sequentially arranged along the extending direction of the air inlet pipe body, and is characterized in that at least one flow deflector (20) is arranged in the air inlet pipe body (10), each flow deflector (20) is arranged between the air inlet (11) and the air outlet (12), and each flow deflector (20) is detachably connected with the air inlet pipe body (10);
each flow deflector (20) is connected with the air inlet pipe body (10) through an adjusting structure, the adjusting structure comprises a rotating part (30), the rotating part (30) is rotatably arranged, and the rotating part (30) is connected with the flow deflector (20); the flow deflector (20) is used for guiding part of air flow entering the air inlet pipe body (10) so as to reduce the non-uniformity of the speed of the air outlet (12);
the rotating part (30) comprises a first connecting rod (31), and the first connecting rod (31) is connected with a first end of the flow deflector (20); the adjustment structure further includes:
the cover plate (40) is covered on the opening (13) of the air inlet pipe body (10), and a first through hole (41) and a positioning hole (42) are formed in the cover plate (40);
the adjusting plate (50) is provided with a plurality of adjusting through holes (51), and the adjusting through holes (51) are arranged at intervals along the circumferential direction of the adjusting plate (50); the first connecting rod (31) penetrates through the first connecting through hole (41) to be connected with the adjusting disc (50);
a first locking member (60) inserted in one of the adjustment through-hole (51) and the positioning hole (42).
2. The intake pipe assembly according to claim 1, wherein the rotating member (30) includes a second connecting rod (32), the second connecting rod (32) is connected with the second end of the deflector (20), and the second connecting rod (32) is inserted through the intake pipe body (10); the adjustment structure further includes:
the second locking piece (70) is in threaded connection with the second connecting rod (32), and the second connecting rod (32) is locked with the air inlet pipe body (10) through the second locking piece (70).
3. The intake pipe assembly according to claim 1 or 2, wherein a plurality of the flow deflectors (20) are provided in the intake pipe body (10), and the plurality of flow deflectors (20) are sequentially arranged in an extending direction of the intake pipe body (10).
4. A method of optimizing an intake pipe assembly, which is applied to the intake pipe assembly according to any one of claims 1 to 3, the method comprising:
obtaining a velocity of an outlet cross-section of an air outlet (12) of the air inlet pipe assembly and a first pressure loss dp of the air inlet pipe assembly 1 ；
Adjusting at least one of an angle, a number and a shape of flow deflectors (20) of the intake duct assembly and obtaining an adjusted velocity of the outlet cross-section of the intake duct assembly and an adjusted second pressure loss dp of the intake duct assembly 2 ；
And selecting the air inlet pipe assembly with an optimized structure according to the speed distribution and the pressure loss of the outlet section of the air inlet pipe assembly before and after adjustment.
5. The method of optimizing an intake air duct assembly of claim 4, wherein the outlet cross-section is symmetrically disposed about at least one line of symmetry that divides the outlet cross-section into a plurality of cross-sections; the method for obtaining the air inlet pipe assembly with optimized structure according to the speed distribution and the pressure loss of the outlet cross section of the air inlet pipe assembly before and after adjustment comprises the following steps:
calculating the speed average value of each section, calculating the standard deviation x of the speed average values of a plurality of sections, and calculating a first quantization score according to a formula 35-15/(1-x);
calculating the speed uniformity y of each section, and calculating a second quantization score of each section according to a formula of 20-10/y;
calculating dp 2 /dp 1 When dp 2 >dp 1 According to the formula-220 + 220/(dp) 2 /dp 1 ) Calculating a third quantization score, when dp 2 <dp 1 According to the formula 220- 2 /dp 1 ) Calculating the third quantization score;
summing the first quantitative score, the plurality of second quantitative scores and the third quantitative score of the air inlet pipe assembly before adjustment to obtain a first total value, summing the first quantitative score, the plurality of second quantitative scores and the third quantitative score of the air inlet pipe assembly after adjustment to obtain a second total value, wherein the structure of the air inlet pipe assembly corresponding to the maximum value of the first total value and the second total value is optimal.
6. A measuring device, characterized in that, applied to the method for optimizing an intake pipe assembly according to claim 4 or 5, the measuring device comprises:
a first measuring means (80) for measuring the velocity at the air outlet (12) of the air inlet tube body (10) of the air inlet tube assembly;
a second measuring part for measuring a pressure loss of the intake pipe assembly.
7. The measurement device of claim 6, further comprising an air intake mechanism, the air intake mechanism comprising:
a fan (100);
the first end of the pipeline assembly (110) is used for being communicated with the fan (100), and the second end of the pipeline assembly (110) is used for being communicated with the air inlet (11) of the air inlet pipe body (10).
8. The measuring device according to claim 7, wherein the air intake mechanism further comprises a frequency converter (120), the frequency converter (120) being connected to the fan (100).
9. The measurement device of claim 7, wherein the conduit assembly (110) comprises:
a first surge tank (111);
the second pressure stabilizing box (112) is positioned on one side, far away from the fan (100), of the first pressure stabilizing box (111);
a flow meter (113) disposed between the first surge tank (111) and the second surge tank (112);
a pressure sensor (114) disposed on the second surge tank (112).
10. The measurement device of claim 7, further comprising:
a support table (130);
the transition connecting pipe (150) is connected with the support table (130), and a second end of the transition connecting pipe (150) is used for being connected with the air inlet pipe assembly and communicated with the air inlet (11);
a first end of the air outlet pipe (140) is connected with the first end of the pipeline assembly (110), and a second end of the air outlet pipe (140) is connected with the first end of the transition connecting pipe (150).
11. A measuring device according to claim 6, characterized in that the first measuring means (80) is a laser Doppler velocimeter.
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| CN202210261352.7A CN114320681B (en) | 2022-03-17 | 2022-03-17 | Air inlet pipe assembly and optimization method and measuring device thereof |
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| CN115342010B (en) * | 2022-10-14 | 2023-03-24 | 潍柴动力股份有限公司 | Air inlet pipe flow guide assembly mounting structure and arrangement method |
| CN115342009B (en) * | 2022-10-14 | 2023-03-21 | 潍柴动力股份有限公司 | Gas engine, air inlet system flow deflector structure and adjusting method thereof |
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