CN110987446B - Optical diesel engine test bed with air inlet inner wall structure convenient to replace - Google Patents
Optical diesel engine test bed with air inlet inner wall structure convenient to replace Download PDFInfo
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- CN110987446B CN110987446B CN201911333493.XA CN201911333493A CN110987446B CN 110987446 B CN110987446 B CN 110987446B CN 201911333493 A CN201911333493 A CN 201911333493A CN 110987446 B CN110987446 B CN 110987446B
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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
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Abstract
An optical diesel engine test bed convenient for replacing an inner wall structure of an air inlet passage belongs to the technical field of automobile engines and comprises an air valve lift adjusting screw, an air valve spring, a cross frame, an air valve guide pipe, a bottom plate, a detachable air inlet passage, an upper positioning plate, a connecting plate, a transparent air cylinder, a sheet optical system, a laser, a high-speed camera, a lower positioning plate and a pressure stabilizing box; the size of the inner wall of the detachable air inlet passage is integrally expanded to a certain size compared with the actual size of the air passage, and inner wall films with different structures are adhered, so that the influence of a plurality of structural parameters such as different air passage shapes, position deviations, minimum sections, spiral slope angles, spiral wrap angles and the like on the air inlet process can be researched; the invention cooperates with the optical measurement system, does not change other parts of the engine, under the situation of not dismantling the engine rack, change the inner wall structure of air inlet duct of the engine, easy and simple to handle; different forms of inlet bench tests can be performed.
Description
Technical Field
The invention belongs to the technical field of automobile engines, and particularly relates to an optical diesel engine test bed with an air inlet channel inner wall structure convenient to replace.
Background
The flow capacity of a diesel engine intake duct and the ability to produce swirling motion represent its flow characteristics, with their corresponding flow coefficient and swirl ratio being important parameters affecting the performance of the diesel engine. For a semi-open type combustion chamber diesel engine, intake vortex is one of important factors influencing the characteristics of the diesel engine, and gas flows through an air inlet channel to generate vortex in a cylinder so as to provide kinetic energy for forming mixed gas. The increase of the strength of the air inlet vortex can improve the vortex ratio of the mixed gas in the cylinder, accelerate the atomization of the fuel oil and the uniform mixing of air, accelerate the propagation speed of flame, further shorten the stagnation period, accelerate the diffusion combustion, reduce the after-combustion, improve the combustion efficiency, and reduce the oil consumption and the emission of harmful substances. The performance of the air inlet passage of the diesel engine has important influence on the dynamics, the economics and the emission performance of the diesel engine, and the development of the air inlet passage meeting the requirements is an important means for improving the performance of the diesel engine. The air inlet has various forms and complex structures, and scholars at home and abroad study the influence of a plurality of structural parameters such as the shape, the position deviation, the minimum section, the spiral slope angle, the height of the vortex chamber, the base slope angle, the eccentricity, the spiral wrap angle and the like of the air inlet on the vortex ratio and the flow coefficient. The engine air flue is cast in the cylinder head, generally is multi-cylinder all-in-one, and the slight difference of air flue structural configuration all can produce very big influence to the wholeness ability of diesel engine, when carrying out different air flue researches, need change different cylinder heads, and the cost is higher, and need cut the processing to the cylinder head under most circumstances or seal operation to other inlet structure that can not use, and the process is loaded down with trivial details.
Disclosure of Invention
The invention aims to separately process a detachable air inlet passage of an engine, wherein the wall thickness is within the range of 3-5 mm, the size of the inner wall of the air inlet passage is integrally expanded to a certain size compared with the actual size of the air passage, and inner wall films with different microstructures or different forms and consistent with the expanded size are processed, wherein the inner wall films can be inner wall films with different or combined parameters such as inner wall shape, position deviation, minimum section, spiral slope angle, spiral wrap angle and the like; different engines have different requirements on the shape, number and structural parameters of the air inlet passage, and slight changes also have great influence on the air inlet process, so that the method is simpler and easier to operate and saves material consumption compared with the method of independently manufacturing the air passages with different inner wall morphological structural parameters, and the air passages with different inner wall morphological structural parameters can be conveniently researched by the same test bench; by matching with an optical test system, an optical engine and an air inlet channel test bed, the flow condition of fluid in an air channel can be visually observed, and the vortex ratio and the flow coefficient can be conveniently measured.
The invention comprises a valve lift adjusting screw, a valve spring, a cross frame, a valve guide pipe, a bottom plate, a detachable air inlet channel, an upper positioning plate, a connecting plate, a transparent cylinder, a sheet optical system, a laser, a high-speed camera, a lower positioning plate and a pressure stabilizing box; wherein the pitch of the valve lift adjusting screw rod is 1mm, and the valve lift adjusting screw rod is connected with the cross frame through threads; the valve guide pipe machine is processed into a step hole shape, is placed on the air inlet channel and is precisely matched with a valve rod of the valve; the valve spring is arranged on the valve guide pipe and is connected with the valve through a valve lock pin and the like; the bottom plate is provided with a valve seat ring which is matched with a valve head of the valve in a grinding way; the detachable air inlet channel is separated from the air valve guide pipe part by the middle part, films with different morphological structures can be conveniently adhered, and the lower end of the air channel is processed into a step shape and clamped in the groove of the bottom plate; the upper positioning plate is connected with the bottom plate, the transparent cylinder is fastened at the lower end of the air passage by the two connecting plates and the lower positioning plate, and the lower positioning plate is connected with the pressure stabilizing box; and a light sheet system, a laser and a high-speed camera are arranged in the optical observation area.
The screw pitch of the valve lift adjusting screw is 1mm, the effective thread length is 14-20 mm, when the screw pitch of the valve lift adjusting screw needs other sizes (such as 0.5 mm, 2 mm and the like), the screw can be matched with the screw and provided with internal and external threads, the realization is convenient, the screw is connected with the cross frame through threads, the lift of the valve is adjusted by rotating the valve lift adjusting screw, and the accurate adjustment of the valve lift under a steady-state test is realized.
The detachable air inlet channel comprises a spiral air inlet channel detachable part and a tangential air inlet channel detachable part, which are respectively formed by processing transparent materials, the part, which avoids an air valve guide pipe, is formed by cutting the middle part, the wall thickness is within the range of 3-5 mm, the size of the inner wall of the air inlet channel is integrally expanded to a certain size compared with the size of an actual air passage, then, inner wall films with different morphological structures and the same size with the expanded size are processed, the films with different morphological structures are pasted according to different test requirements, and the shadow of a plurality of structural parameters such as different air passage shapes, position deviation, minimum section, spiral slope angle, spiral wrap angle and the like on the air inlet process can be researched.
The lower end of the detachable air inlet channel is processed into a step shape and clamped in the groove of the bottom plate, the valve seat ring is processed on the bottom surface of the bottom plate and is concentric with the groove of the bottom plate, the valve seat ring can be processed by metal materials and is in grinding fit with the valve, and therefore the valve seat ring which is originally integrated with the air passage and has higher processing requirements can be separately processed, and meanwhile the position connection relation of the valve seat ring and the air passage can be ensured.
The valve guide pipe machine is processed into a step hole shape, is placed into a valve guide pipe counter bore at the upper end of the detachable air passage and is precisely matched with a valve rod of the valve to guide the valve; the valve spring is placed on the valve guide pipe, and plays a role in radially stabilizing the valve spring.
The upper positioning plate is connected with the bottom plate, the transparent cylinder is fastened at the lower end of the air passage by the two connecting plates and the lower positioning plate, the lower positioning plate is connected with the pressure stabilizing box, and the connecting piece is made of light aluminum alloy material;
a photosystem, a laser and a high-speed camera are placed in the optical observation area, and the gas flowing condition in the cylinder is observed through an optical test system.
The detachable air inlet channel is made of transparent materials.
The working principle and the process of the invention are as follows:
the air valve lift adjusting screw has the screw pitch of 1mm and is connected with the cross frame through threads; the valve guide pipe machine is processed into a step hole shape, is placed on the air inlet channel and is precisely matched with the valve rod; the valve spring is arranged on the valve guide pipe and is connected with the valve through the valve lock pin; the bottom plate is provided with a valve seat ring which is matched with a valve head of the valve in a grinding way; the detachable air inlet channel is formed by cutting the middle part of the detachable air inlet channel away from the valve guide pipe, films with different morphological structures can be conveniently adhered, and the lower end of the air channel is processed into a step shape and clamped in the groove of the bottom plate; the upper positioning plate is connected with the bottom plate and fastens the transparent cylinder at the lower end of the air passage with the two connecting plates and the lower positioning plate; the lower positioning plate is connected with the pressure stabilizing box; and a sheet light system, a laser and a high-speed camera are arranged in the optical observation area, and the gas flow condition in the cylinder is observed through the optical test system. When the gas flow in an engine, particularly the gas flow in the gas inlet process, is researched, an engine control system coordinately controls different parts of the engine to work, after the required test conditions are reached, the gas added with a fluorescent agent is filled into a gas inlet channel, a laser generates a sheet laser beam through a sheet light system, the laser wavelength is adjusted, when the photon energy of the laser is equal to the difference between certain two specific energy levels of molecules, the molecules can absorb the photon energy and jump to a high energy state, the molecules in the high energy state are unstable, and when the molecules return to the ground state from the high energy state, spontaneous radiation can be generated to emit fluorescence, so that the reference quantity of a certain section in a flow field can be imaged. Meanwhile, the valve is positioned at the designated valve lift under the adjustment of the valve lift adjusting screw rod, so that the flow field motion condition of gas in the gas passage under different valve lifts can be conveniently and visually observed, and the vortex ratio and the flow coefficient can also be measured; when the air inlet channel bench test of different forms is carried out, other parts of the engine can be changed without being detached, air channel inner wall films with different form structures can be conveniently replaced, and the matching problem of different forms of air channels and geometric shapes of combustion chambers and the influence of different structure parameters on the circulation characteristics of the air inlet channel can be researched.
The invention has the beneficial effects that:
1. the valve seat ring is processed on the bottom plate and is separately processed by different materials with the air inlet channel, so that the shape of the air inlet channel and the shape of the actual air channel can be kept consistent, and the grinding matching of the valve seat ring and the valve can be ensured.
2. Because the engine air flue is cast in the cylinder head, and is generally a multi-cylinder all-in-one machine, when carrying out different air flue researches, need change different cylinder heads, the cost is higher, and in most cases need to carry out cutting process to the cylinder head or carry out sealing operation to other air inlet structures that can not use, and the process is loaded down with trivial details. According to the detachable air inlet passage, the detachable air inlet passage is independently manufactured, other parts of an engine do not need to be cut or sealed, the detachment of the cylinder cover part of the engine can be reduced, different air passage inner wall films can be conveniently replaced under the condition that an original rack is not detached through the detachable air inlet passage, the influence of a plurality of structural parameters such as different air passage shapes, position deviation, minimum cross section, spiral slope angles and spiral wrap angles on an air inlet process can be researched, the matching of different air inlet passage shapes and the geometric shape of a combustion chamber can be researched, the operation is simple and convenient, materials are saved, and the detachable air inlet passage is easy to realize.
3. The invention is matched with an optical test system, an optical engine and an air inlet channel test bed to test air inlet channels with different structural forms on the inner wall, the matching problem of the geometric shapes of air passages and combustion chambers in different forms and the influence of different structural parameters on the air inlet process are researched, the vortex motion condition of a flow field in the air inlet channel can be conveniently observed, the vortex ratio and the flow coefficient are measured, and the optical diagnosis test research of the air inlet process of the engine is facilitated.
Drawings
Fig. 1 is an exploded view of a portion of the structure of an embodiment of the present invention.
Fig. 2 is a schematic perspective view of an embodiment of the present invention.
Wherein: the device comprises a valve lift adjusting screw rod 1, a valve 2, a valve 3, a valve spring 4, a cross frame 5, a valve guide pipe 6, a bottom plate 7, a detachable air inlet channel 8, an upper positioning plate 9, a connecting plate 10, a transparent cylinder 11, a sheet light system 12, a laser 13, a high-speed camera 14, a lower positioning plate 15, a pressure stabilizing box 15, a double-thread screw rod 401, a spiral air inlet channel 701, and a tangential air inlet channel 702.
Detailed Description
Referring to fig. 1 and 2, the present embodiment includes a valve lift adjusting screw 1, a valve 2, a valve spring 3, a cross frame 4, a valve guide 5, a bottom plate 6, a detachable air inlet channel 7, an upper positioning plate 8, a connecting plate 9, a transparent cylinder 10, a sheet optical system 11, a laser 12, a high-speed camera 13, a lower positioning plate 14, a surge tank 15, a double-threaded screw 401, a spiral air inlet channel detachable portion 701, and a tangential air inlet channel detachable portion 702; wherein, the air valve lift adjusting screw rod 1 has a thread pitch of 1mm and is connected with the cross frame 4 through threads; the valve guide pipe 5 is machined into a stepped hole shape, is placed on the air inlet channel and is precisely matched with a valve rod of the valve 2; the valve spring 3 is arranged on the valve guide pipe 5 and is connected with the valve through a valve lock pin and the like; the bottom plate 6 is provided with a valve seat ring which is matched with the valve head of the valve 2 in a grinding way; the detachable air inlet channel 7 is separated from the middle part by avoiding the valve guide part, films with different structural forms can be conveniently adhered, and the lower end of the detachable air inlet channel 7 is processed into a step shape and clamped in the groove of the bottom plate 6; the upper positioning plate 8 is connected with the bottom plate 6, and the transparent cylinder 10 is fastened at the lower end of the air passage by the two connecting plates 9 and the lower positioning plate 14; the lower positioning plate 14 is connected with a pressure stabilizing box 15; the sheet optical system 11, the laser 12, and the high-speed camera 13 are placed in an optical observation area.
The screw pitch of the valve lift adjusting screw 1 is 1mm, the effective thread length is 14-20 mm, when the screw pitch of the valve lift adjusting screw 1 needs other sizes (such as 0.5 mm, 2 mm and the like), a double-thread screw 401 with internal and external threads matched with the screw pitch can be manufactured, the realization is convenient, the external thread is connected with the cross frame 4, the internal thread is matched with the valve lift adjusting screw 1, the lift of the valve 2 is adjusted by rotating the valve lift adjusting screw 1, and the accurate adjustment of the valve lift under a steady-state test is realized.
The detachable air inlet channel 7 comprises a spiral air inlet channel detachable part 701 and a tangential air inlet channel detachable part 702; the tangential and spiral detachable air inlet channels 7 are respectively processed by transparent materials, the wall thickness is within the range of 3-5 mm, the air valve guide pipe is avoided, the air inlet channel is formed by dividing the air valve guide pipe from the middle, the size of the inner wall of the air inlet channel is integrally expanded to a certain size compared with the size of an actual air passage, inner wall films which have different morphological structures and are consistent with the expanded size are processed, the spiral air inlet channel detachable part 701 and the tangential air inlet channel detachable part 702 are detached, and the inner wall films with different morphological structures can be conveniently pasted according to different test requirements; the vortex motion condition of the gas in the gas channel flow field can be conveniently and visually observed, and the vortex ratio and the flow coefficient of gas inlet channels in different forms can be measured; the air inlet channel bench test in different forms can be carried out, the influence of a plurality of structural parameters such as different air channel shapes, position deviation, minimum cross section, spiral slope angle, spiral wrap angle and the like on the air inlet process can be researched, and the matching of the air channels in different forms and the geometric shape of the combustion chamber can be researched; the lower end of the detachable air inlet channel 7 is processed into a step shape and clamped in a groove of the bottom plate 6, the bottom surface of the bottom plate 6 is processed with an air valve seat ring which is concentric with the groove of the bottom plate 6 and can be processed by metal materials and is in grinding fit with the air valve 2, so that the air valve seat ring which is integrated with the air channel but has different processing requirements is separately processed, and the position connection relation of the air valve seat ring and the air valve seat ring can be ensured.
The valve guide pipe 5 is machined into a step hole shape, is placed in a counter bore at the upper end of the detachable air channel 7 and is precisely matched with a valve rod of the valve 2 to guide the valve 2; the valve spring 3 is placed on the valve guide 5, and the valve spring 3 can be radially stabilized.
The upper positioning plate 8 is connected with the bottom plate 6, the transparent cylinder 10 is fastened at the lower end of the air passage by the two connecting plates 9 and the lower positioning plate 14, the lower positioning plate 14 is connected with the pressure stabilizing box 15, and the connecting piece is processed by light aluminum alloy materials; a sheet light system 11, a laser 12 and a high-speed camera 13 are placed in an optical observation area, and the gas flow condition in the cylinder is observed through an optical test system.
The detachable air inlet channel 7 is made of transparent material.
Claims (3)
1. An optical diesel engine test bed with an air inlet channel inner wall structure convenient to replace is characterized by comprising an air valve lift adjusting screw rod (1), an air valve (2), an air valve spring (3), a cross frame (4), an air valve guide pipe (5), a bottom plate (6), a detachable air inlet channel (7), an upper positioning plate (8), a connecting plate (9), a transparent cylinder (10), a sheet optical system (11), a laser (12), a high-speed camera (13), a lower positioning plate (14) and a pressure stabilizing box (15); the valve lift adjusting screw (1) is connected with the cross frame (4) through threads, and the valve lift is adjusted by rotating the valve lift adjusting screw (1); the valve guide pipe (5) is machined into a step hole shape and is placed on the air inlet channel; the valve guide pipe (5) is precisely matched with a valve rod of the valve (2); the valve spring (3) is arranged on the valve guide pipe (5) and is connected with the valve through a valve lock pin; the bottom plate (6) is provided with a valve seat ring which is in grinding fit with a valve head of the valve (2); the detachable air inlet channel (7) is separated from the air valve guide pipe part by the middle, the wall thickness is 3-5 mm, the size of the inner wall of the detachable air inlet channel (7) is integrally expanded compared with the size of an actual air passage, inner wall films with different microstructures or different forms and the same size as the expanded size are processed, and the inner wall films with different microstructures or different forms and the same size as the expanded size are adhered according to different test requirements; the lower end of the detachable air inlet channel (7) is processed into a step shape and clamped into a groove of the bottom plate (6); the upper positioning plate (8) is connected with the bottom plate (6) and fastens the transparent cylinder (10) at the lower end of the detachable air inlet channel together with the two connecting plates (9) and the lower positioning plate (14); the lower positioning plate (14) is connected with a pressure stabilizing box (15); a sheet optical system (11), a laser (12) and a high-speed camera (13) are placed in an optical observation area.
2. The optical diesel engine test bed convenient for replacing the inner wall structure of the air inlet channel, which is characterized in that: the detachable air inlet channel (7) comprises a spiral air inlet channel detachable part (701) and a tangential air inlet channel detachable part (702); the detachable air inlet channel (7) is formed by processing a transparent material; the adhered film is an inner wall film with different inner wall shapes, position deviation, minimum cross sections, spiral slope angles and spiral wrap angles, and the wall thickness is consistent with the outward expansion size; the dividing position is not limited to the middle part before the valve guide, and includes all cutting positions convenient for adhering the inner wall film.
3. The optical diesel engine test bed convenient for replacing the inner wall structure of the air inlet channel, which is characterized in that: the thread pitch of the valve lift adjusting screw (1) is 1mm, the effective length of the screw thread is 14-20 mm, and the air passage steady flow test under different valve lifts within the range of at least 0-14 mm can be realized; the threaded hole on the cross frame (4) corresponding to the threaded hole is in threaded connection with the valve lift adjusting screw (1) through the internal thread of the double-thread screw (401), the external thread of the double-thread screw (401) is connected with the threaded hole on the cross frame (4), and the thread pitch of the valve lift adjusting screw (1) is matched with the internal thread of the double-thread screw (401).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911333493.XA CN110987446B (en) | 2019-12-23 | 2019-12-23 | Optical diesel engine test bed with air inlet inner wall structure convenient to replace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911333493.XA CN110987446B (en) | 2019-12-23 | 2019-12-23 | Optical diesel engine test bed with air inlet inner wall structure convenient to replace |
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| Publication Number | Publication Date |
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| CN110987446A CN110987446A (en) | 2020-04-10 |
| CN110987446B true CN110987446B (en) | 2021-07-27 |
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Citations (7)
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| CN101038238A (en) * | 2007-02-09 | 2007-09-19 | 赵铁良 | Test device for petrol engine duct test tumble flow |
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| CN110044633A (en) * | 2019-06-05 | 2019-07-23 | 吉林大学 | A kind of engine cylinder cover experimental rig of replaceable air intake duct |
| CN110043368A (en) * | 2019-05-22 | 2019-07-23 | 中国科学院工程热物理研究所 | A kind of inlet structure and preparation method thereof |
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2019
- 2019-12-23 CN CN201911333493.XA patent/CN110987446B/en not_active Expired - Fee Related
Patent Citations (7)
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|---|---|---|---|---|
| CN101038238A (en) * | 2007-02-09 | 2007-09-19 | 赵铁良 | Test device for petrol engine duct test tumble flow |
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| CN102691601A (en) * | 2012-06-19 | 2012-09-26 | 江苏大学 | Air inlet passage of engine |
| FR3037398B1 (en) * | 2015-06-12 | 2018-09-07 | Safran Aircraft Engines | AIR RECOVERY AUGET FOR AN AIR INTAKE CHIMNEY OF A TURBOMACHINE TESTING BENCH |
| US10006833B1 (en) * | 2016-08-24 | 2018-06-26 | Northrop Grumman Systems Corporation | Method for vortex generator array sizing and placement within offset diffusers |
| CN110043368A (en) * | 2019-05-22 | 2019-07-23 | 中国科学院工程热物理研究所 | A kind of inlet structure and preparation method thereof |
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Granted publication date: 20210727 Termination date: 20211223 |