CN110501165B - Device for simultaneously measuring temperature of near-wall flow field and wall surface of cylinder sleeve of internal combustion engine - Google Patents
Device for simultaneously measuring temperature of near-wall flow field and wall surface of cylinder sleeve of internal combustion engine Download PDFInfo
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- CN110501165B CN110501165B CN201910583209.8A CN201910583209A CN110501165B CN 110501165 B CN110501165 B CN 110501165B CN 201910583209 A CN201910583209 A CN 201910583209A CN 110501165 B CN110501165 B CN 110501165B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/02—Details or accessories of testing apparatus
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/05—Testing internal-combustion engines by combined monitoring of two or more different engine parameters
Abstract
The invention discloses a device for simultaneously measuring the temperature of a near-wall flow field and a wall surface of a cylinder sleeve of an internal combustion engine, which has the following structure: the quartz glass cylinder sleeve and the metal cylinder sleeve are combined into a complete cylinder sleeve which is arranged in the lifting cylinder sleeve, the cylinder cover is fixed with the lengthening machine body, and the lead screw at one side of the lengthening machine body drives the lifting plate to fix the lifting cylinder sleeve between the complete cylinder sleeve and the cylinder cover. The window fan angle of the quartz glass cylinder sleeve is 300 degrees; the metal cylinder sleeve is 60 degrees. Two ends of the two cylinder sleeves are provided with 10-degree fan angles, and the glass cylinder sleeves are provided with bosses; the metal cylinder sleeve is provided with a groove, and the boss is butted with the groove. The laser is arranged on the extension line of the symmetrical center of the complete cylinder sleeve, and the two cameras are symmetrically arranged on the two sides of the laser. The thermocouple penetrates through the metal sleeve and is positioned in the center of the flow field measurement area. The two cameras are matched with a particle image velocimeter to measure a three-dimensional flow field at the position close to the wall of the metal cylinder sleeve, and the thermocouple can read the temperature of the cylinder sleeve in real time, so that the problem of simultaneous measurement of the temperature of the flow field at the position close to the wall and the wall surface of the cylinder sleeve of the internal combustion engine is solved.
Description
Technical Field
The invention belongs to the technical field of internal combustion engine working parameter testing, and particularly relates to a device for measuring the internal combustion engine cylinder sleeve.
Background
During the working process of the internal combustion engine, under the combined action of the combustion chamber, the cylinder sleeve and the piston, a thin boundary layer, generally less than 2mm, is formed on the near wall of the cylinder. Although the boundary layer in the cylinder is thin, the gas density in the boundary layer is relatively high and can account for 10% -20% of the total mass of the gas in the cylinder. In addition, the exchange of momentum, energy and mass between the in-cylinder boundary layer and the peripheral flow field is closely related to the working process of the internal combustion engine, plays a vital role in the macroscopic flow field structure, the wall heat transfer and the combustion characteristic of the internal combustion engine, and finally influences the thermal efficiency and the pollutant discharge of the internal combustion engine. Therefore, based on the importance of the in-cylinder boundary layer of the internal combustion engine, the research on the in-cylinder boundary layer has been receiving a lot of attention, wherein it is important to simultaneously acquire as much detailed information related to the near-wall region as possible, such as the near-wall region gas velocity and temperature distribution, the wall surface temperature, and the like.
The cylinder sleeve is used as a part of a closed space in the structure of the internal combustion engine, and the acquisition of the related information of the boundary layer of the near wall has certain difficulty and specificity. The concrete expression is as follows: (1) based on an optical engine and a laser diagnosis technology, the all-quartz glass cylinder sleeve has the characteristic of visualization, and allows an optical method to measure the flow field in the cylinder. However, because the cylinder liner is annular and the quartz glass cylinder liner is generally thick, serious optical distortion is brought to the traditional camera measurement (the optical axis of the camera is perpendicular to the measurement plane) when the near-wall flow field of the cylinder liner is measured, so that a good particle imaging effect is difficult to obtain, and a new optical path arrangement method is needed; (2) in order to place a thermocouple for measuring wall temperature, a bore is typically drilled into the cylinder liner. The drilling of holes in the all-quartz glass cylinder sleeve brings great difficulty and challenge; the problem of drilling by using the metal cylinder sleeve can be solved, but the metal cylinder sleeve cannot be visualized, so that a near-wall flow field cannot be measured. Therefore, the simultaneous acquisition of the flow field of the cylinder sleeve near the wall and the temperature of the wall surface is difficult to meet simultaneously.
Therefore, the measuring device capable of simultaneously obtaining the temperature of the flow field close to the wall of the cylinder sleeve and the temperature of the wall surface is provided, has important significance for researching the flow of a boundary layer of the internal combustion engine and the heat transfer characteristic of the wall surface, and simultaneously can provide beneficial guidance for further improving the efficiency of the internal combustion engine and reducing the pollutant discharge.
Disclosure of Invention
The invention aims to provide a device for simultaneously measuring the temperature of a near-wall flow field and a wall surface of a cylinder sleeve of an internal combustion engine, and solves the problems that the traditional camera is limited in measurement and a glass cylinder sleeve or a metal cylinder sleeve cannot be measured.
The device of measuring near wall flow field and wall temperature to internal-combustion engine cylinder liner department simultaneously includes: the device comprises a lifting cylinder sleeve, a lengthened piston, a cylinder cover, a support column, a lengthened machine body, a lead screw, a lifting plate, a rubber gasket, a thrust bearing, a rolling bearing, a laser, a camera, a polytetrafluoroethylene gasket, a lens adapter, a clamp assembly, a thermocouple and the like. The system of the invention comprises the following components: the complete cylinder sleeve is arranged in the lifting cylinder sleeve, the lengthened piston is arranged in the complete cylinder sleeve, the cylinder cover is supported by four symmetrical support columns, and the lower ends of the support columns are fixed with the lengthened engine body through threads. Two sides of the lengthened engine body are of an open structure, the opening width is larger than the outer diameter of the complete cylinder sleeve, lead screws are arranged on two sides of the opening of the lengthened engine body, lifting plates are mounted on the lead screws, the lifting plates and the lifting cylinder sleeve are in positioning fit and fixed through rabbets, the lead screws drive the lifting plates and the lifting cylinder sleeve to move upwards, and the complete cylinder sleeve is fixed between the lower end faces of the lifting cylinder sleeve and the cylinder cover.
In order to achieve the purpose of simultaneously measuring the near-wall flow field and the wall surface temperature of the cylinder sleeve of the internal combustion engine, the technical scheme is as follows: the non-complete quartz glass cylinder sleeve and the non-complete metal cylinder sleeve are combined into a complete cylinder sleeve, and the thicknesses of the complete cylinder sleeve and the non-complete cylinder sleeve are the same. The effective window fan angle of the incomplete quartz glass cylinder sleeve is 300 degrees; the fan angle of the incomplete metal cylinder sleeve is 60 degrees. Bosses with 10 degrees of fan angle and 15mm thick are arranged at two ends of the incomplete quartz glass cylinder sleeve; grooves with the sector angle of 10 degrees and the width of 15mm are arranged at two ends of the incomplete metal cylinder sleeve, and the bosses are in butt joint with the grooves. Rubber gaskets are arranged on the upper portion and the lower portion of the complete cylinder sleeve, and a hoop assembly is arranged on the outer ring of each rubber gasket. The laser is arranged on a central extension line vertical to the complete cylinder sleeve, and the two cameras with the same model number are symmetrically arranged on two sides of the laser. The laser is provided with a laser sheet light source, and the camera is provided with a lens adapter. A small hole is drilled on the wall of the incomplete metal cylinder sleeve, and a thermocouple is placed in the complete cylinder sleeve through the small hole and positioned in the center of a flow field measurement area.
The invention has the characteristics and beneficial effects that: (1) the cylinder sleeve formed by mixing the quartz glass cylinder sleeve and the metal cylinder sleeve solves the problems of drilling holes for installing the cylinder sleeve by a thermocouple and visualization of a combustion chamber, and can simultaneously obtain the temperature of a flow field close to the wall surface of the cylinder sleeve and the temperature of the wall surface of the cylinder sleeve; (2) the camera with the lens adapter enables the lens and the camera body to form an inclined included angle of other than 90 degrees, the camera view field covers one side of the incomplete metal cylinder sleeve, and meanwhile, the optical distortion effect caused by the quartz glass cylinder sleeve under the traditional camera arrangement can be reduced; (3) the two cameras are matched with a particle image velocimeter to accurately measure the three-dimensional flow field at the position close to the wall of the metal cylinder sleeve.
Drawings
FIG. 1 is an assembly diagram of the apparatus of the present invention.
Fig. 2 is a structure diagram of a complete cylinder sleeve formed by cylinder sleeves made of two materials.
FIG. 3 is a schematic diagram of a test assembly arrangement according to the present invention.
Detailed Description
The structure and principles of the present invention are further described below by way of specific embodiments in conjunction with the accompanying drawings so that the features of the present invention can be readily understood by those skilled in the art, and the scope of protection therefore clearly defined.
The structural arrangement scheme of the device assembly is shown in figure 1. The concrete structure composition is as follows: the complete cylinder sleeve is arranged in the lifting cylinder sleeve 1, the lengthened piston 2 is arranged in the complete cylinder sleeve, the cylinder cover 3 is supported by four symmetrical support columns 4, and the lower ends of the support columns are fixed with the lengthened engine body 5 through threads. Two sides of the lengthened machine body are of an open structure, the opening width is larger than the outer diameter of the complete cylinder sleeve, lead screws 6 are arranged on two sides of the opening of the lengthened machine body, lifting plates 7 are mounted on the lead screws, and the lifting plates and the lifting cylinder sleeve are matched and fixed through seam allowance positioning. The screw rod drives the lifting plate and the lifting cylinder sleeve to move upwards, so that the complete cylinder sleeve is fixed between the lifting cylinder sleeve and the lower end face of the cylinder cover.
The complete cylinder liner structure is shown in FIG. 2. The non-complete quartz glass cylinder sleeve 10-1 and the non-complete metal cylinder sleeve 10-2 are combined into a complete cylinder sleeve 10, and the thicknesses of the complete cylinder sleeve and the non-complete cylinder sleeve are the same. The effective window fan angle of the incomplete quartz glass cylinder sleeve is 300 degrees; the incomplete metal liner has a fan angle of 60 degrees (as shown in fig. 3). Bosses with 10 degrees of fan angle and 15mm thick are arranged at two ends of the incomplete quartz glass cylinder sleeve; grooves with the sector angle of 10 degrees and the width of 15mm are arranged at two ends of the incomplete metal cylinder sleeve, and the bosses are in butt joint with the grooves. Rubber gaskets 11 are arranged on the upper portion and the lower portion of the complete cylinder sleeve, and a hoop component 12 is arranged on the outer ring of each rubber gasket. The laser 13 is arranged on a central extension line perpendicular to the complete cylinder sleeve, and two cameras 14 with the same model number are symmetrically arranged on two sides of the laser. The laser is provided with a laser sheet light source, the camera is provided with a lens adapter 15, a small hole is drilled on the wall of the incomplete metal cylinder sleeve, and a thermocouple 16 is placed in the complete cylinder sleeve through the small hole and positioned in the center of a flow field measurement area. The thickness of the incomplete quartz glass cylinder sleeve and the thickness of the incomplete metal cylinder sleeve are both 25 mm.
The upper top end of the screw rod is provided with a thrust bearing 8, the lower top end is provided with a rolling bearing 9, and the thrust bearing and the rolling bearing are both positioned on two side surfaces of the opening of the lengthened machine body.
The connection of the boss of the quartz glass cylinder sleeve and the groove of the metal cylinder sleeve is clearance fit, and a polytetrafluoroethylene gasket is arranged between the stress binding surfaces, so that the brittle quartz glass cylinder sleeve is prevented from being damaged due to rigid contact of two different materials. The upper surface and the lower surface of the complete cylinder sleeve, the lifting cylinder sleeve and the contact surface of the bottom surface of the cylinder cover are all required to be provided with polytetrafluoroethylene gaskets.
The camera with the lens adapter has a non-90-degree inclined included angle between the lens and the camera body, so that the view field of the camera covers one side of the non-complete metal cylinder sleeve. And the thermocouple drill hole position is selectively placed on the symmetrical center line of the metal cylinder sleeve and is positioned in the flow field measurement area.
The center lines of the complete cylinder sleeve, the lifting cylinder sleeve and the cylinder cover combustion chamber are positioned on the same axis, so that the stability of the piston in high-speed up-and-down reciprocating motion is ensured. The lifting cylinder sleeve is fixedly locked through the screw rod assembly, so that good sealing performance in the cylinder is guaranteed during working.
The minimum contraction diameter of the hoop component is slightly smaller than the outer diameter of the complete mixed material cylinder sleeve, and the used material has tensile capacity.
The thickness of the laser sheet light source is adjusted to about 1mm, and sheet light emitted by a laser is emitted into the cylinder from one side of the quartz glass cylinder sleeve to reach the wall surface of the metal cylinder sleeve. The Scheimpflug type lens adapter is selected, the two cameras provided with the lens adapters are symmetrically arranged on two sides of the laser sheet light source, and the starting of the laser sheet light source is strictly synchronous with the shooting and recording time of the cameras. And (3) obtaining a three-dimensional flow field close to the inner wall of the cylinder sleeve by matching with a trace particle velocimeter (PIV). The thermocouple located in the center of the complete cylinder liner can test the temperature in the cylinder liner in real time.
Claims (6)
1. The device of measuring near wall flow field and wall temperature to internal-combustion engine cylinder liner department simultaneously includes: lift cylinder liner, extension piston, cylinder cap, support column, extension organism, lead screw, lifter plate, rubber packing ring, footstep bearing, antifriction bearing, laser instrument, camera, polytetrafluoroethylene gasket, camera lens adapter, clamp subassembly and thermocouple, its characterized in that: the complete cylinder sleeve is arranged in a lifting cylinder sleeve (1), a lengthened piston (2) is positioned in the complete cylinder sleeve, a cylinder cover (3) is supported by four symmetrical support columns (4), the lower ends of the support columns are fixed with a lengthened machine body (5) through threads, two side surfaces of the lengthened machine body are of an opening structure, the opening width is larger than the outer diameter of the complete cylinder sleeve, two sides of the opening of the lengthened machine body are respectively provided with a lead screw (6), the lead screws are provided with a lifting plate (7), the lifting plate and the lifting cylinder sleeve are positioned and matched through a spigot and are fixed, the lead screws drive the lifting plate and the lifting cylinder sleeve to move upwards, so that the complete cylinder sleeve is fixed between the lifting cylinder sleeve and the lower end surface of the cylinder cover, the complete cylinder sleeve (10) is combined by an incomplete quartz glass cylinder sleeve (10-1) and an incomplete metal cylinder sleeve (10-2, the fan angle of the incomplete metal cylinder sleeve is 60 degrees, bosses with the fan angles of 10 degrees and the thicknesses of 15mm are arranged at two ends of the incomplete quartz glass cylinder sleeve, grooves with the fan angles of 10 degrees and the widths of 15mm are arranged at two ends of the incomplete metal cylinder sleeve, the bosses are in butt joint with the grooves, rubber gaskets (11) are arranged on the upper portion and the lower portion of the complete cylinder sleeve respectively, a hoop component (12) is arranged on the outer ring of each rubber gasket, a laser (13) is arranged on a central extension line perpendicular to the complete cylinder sleeve, two cameras (14) with the same model number are symmetrically arranged on two sides of the laser, the laser is provided with a laser sheet light source, the camera is provided with a lens adapter (15), a small hole is drilled in the wall of the incomplete metal cylinder sleeve, and a thermocouple (16) penetrates through the small hole and is arranged in.
2. The apparatus for simultaneously measuring the near-wall flow field and wall temperature of a cylinder liner of an internal combustion engine as set forth in claim 1, wherein: the thickness of the incomplete quartz glass cylinder sleeve and the thickness of the incomplete metal cylinder sleeve are both 25 mm.
3. The apparatus for simultaneously measuring the near-wall flow field and wall temperature of a cylinder liner of an internal combustion engine as set forth in claim 1, wherein: the upper top end of the screw rod is provided with a thrust bearing (8), the lower top end of the screw rod is provided with a rolling bearing (9), and the thrust bearing and the rolling bearing are both positioned on two side surfaces of the opening of the lengthened machine body.
4. The device for simultaneously measuring the temperature of the near-wall flow field and the wall surface of the cylinder sleeve of the internal combustion engine according to claim 1, wherein: the non-integral quartz glass cylinder sleeve boss is in clearance fit with the non-integral metal cylinder sleeve groove, and a polytetrafluoroethylene gasket is arranged between the stress binding surfaces.
5. The apparatus for simultaneously measuring the near-wall flow field and wall temperature of a cylinder liner of an internal combustion engine as set forth in claim 1, wherein: the camera with the lens adapter has a non-90-degree inclined included angle between the lens and the camera body, so that the view field of the camera covers one side of the non-complete metal cylinder sleeve.
6. The apparatus for simultaneously measuring the near-wall flow field and wall temperature of a cylinder liner of an internal combustion engine as set forth in claim 1, wherein: and polytetrafluoroethylene gaskets are required to be arranged on the upper surface and the lower surface of the complete cylinder sleeve, the lifting cylinder sleeve and the contact surface of the bottom surface of the cylinder cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910583209.8A CN110501165B (en) | 2019-07-01 | 2019-07-01 | Device for simultaneously measuring temperature of near-wall flow field and wall surface of cylinder sleeve of internal combustion engine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910583209.8A CN110501165B (en) | 2019-07-01 | 2019-07-01 | Device for simultaneously measuring temperature of near-wall flow field and wall surface of cylinder sleeve of internal combustion engine |
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| CN110501165A CN110501165A (en) | 2019-11-26 |
| CN110501165B true CN110501165B (en) | 2020-12-01 |
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