GB2618669A - Jet experiment bench for measurement of temperature field of engine piston - Google Patents
Jet experiment bench for measurement of temperature field of engine piston Download PDFInfo
- Publication number
- GB2618669A GB2618669A GB2304227.8A GB202304227A GB2618669A GB 2618669 A GB2618669 A GB 2618669A GB 202304227 A GB202304227 A GB 202304227A GB 2618669 A GB2618669 A GB 2618669A
- Authority
- GB
- United Kingdom
- Prior art keywords
- module
- piston
- linear motion
- combustion
- temperature field
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000002474 experimental method Methods 0.000 title claims abstract description 42
- 238000005259 measurement Methods 0.000 title claims abstract description 14
- 238000002485 combustion reaction Methods 0.000 claims abstract description 59
- 238000012360 testing method Methods 0.000 claims abstract description 21
- 238000007599 discharging Methods 0.000 claims description 25
- 239000000779 smoke Substances 0.000 claims description 24
- 230000007246 mechanism Effects 0.000 claims description 9
- 239000000498 cooling water Substances 0.000 claims description 5
- 101150038956 cup-4 gene Proteins 0.000 abstract description 4
- 238000013461 design Methods 0.000 abstract description 3
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 230000017525 heat dissipation Effects 0.000 abstract 1
- 238000009434 installation Methods 0.000 description 8
- 239000001301 oxygen Substances 0.000 description 7
- 229910052760 oxygen Inorganic materials 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- G01M15/042—Testing internal-combustion engines by monitoring a single specific parameter not covered by groups G01M15/06 - G01M15/12
- G01M15/048—Testing internal-combustion engines by monitoring a single specific parameter not covered by groups G01M15/06 - G01M15/12 by monitoring temperature
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Testing Of Engines (AREA)
Abstract
An experiment bench for measurement of a temperature field of an engine piston consists of four modules, Module ‘A’ (Figure 3a), Module ‘B’ (Figure 5), Module ‘C’ (Figure 6) and Module ‘D’ (Figure 7). Module ‘A’ and Module ‘B’ house the main mechanical apparatus, and Module ‘A’ is installed above Module ‘B’. Module ‘A’ includes a fixed exhaust pipe 1 telescopically attached to a movable exhaust pipe 2, a combustion hood 3, a combustion cup 4 and a long-stroke linear motion module (6 Figure 2b). Module ‘B’ includes the test piston (7 Figure 2b), a piston seat (8 Figure 2b) and a short-stroke linear motion module 5. When under test, the movable exhaust pipe, the combustion hood and the combustion cup together form the combustion chamber, and the test piston is driven by a lifting plate attached to the short-stroke linear motion module, via for example a ball-screw linear actuator, that moves the piston in and out of the combustion chamber. The modular design permits quick assembly, and by use of remote and automatic control, allows simulating the heating and heat dissipation of the piston and accurate distribution of the temperature field of the piston is obtained.
Description
JET EXPERIMENT BENCH FOR MEASUREMENT OF TEMPERATURE FIELD OF ENGINE PISTON
TECHNICAL FIELD
[0001] The present application relates to a jet experiment bench, in particular a jet experiment bench applied to an engine piston.
BACKGROUND ART
[0002] With regard to a diesel engine for an vehicle, improving the power density thereof has always been the main research direction thereof, but the continuous improvement of the power and the best reduction of the structural size cause the working conditions of the internal parts of the diesel engine to be worse. A diesel engine piston is one of the parts having the worst operating conditions among all the parts in the interior of the diesel engine piston. The reciprocating motion characteristic of the diesel engine piston not only makes it subject to an inertial force and a larger mechanical load, but also makes it subject to a huge thermal load as the periodically changing temperature in the combustion chamber and the larger temperature difference between the piston head and the piston skirt.
[0003] The damage to the piston is mainly fatigue damage caused by the thermal load exceeding the limit parameters such as cracks, so it is a problem that must be solved in the engine strengthening process to accurately detect the temperature field of the piston and then analyze the magnitude of the thermal load. The traditional test method is to assemble the temperature measurement element into the engine for real machine testing, but the complex combustion process and residual exhaust gas in the combustion chamber always interfere with temperature detection, resulting in that the result can only show a curve with the same trend as the actual temperature change, but there is a relatively large difference in numerical value.
[0004] In the design process of the engine piston, the analysis of the temperature field and calculation of the thermal stress are indispensable, and the performance of the engine piston determines the upper limit of engine strengthening to a certain extent. Therefore, through experiment means, accurate simulation and measurement of the thermodynamic characteristics of the engine piston during the operation of the engine have great implications for design of the engine piston.
SUM MARY
[0005] The object of the present application is to provide a jet experiment bench for measurement of temperature field of an engine piston which can accurately simulate temperature field of the piston during the operation of the engine.
[0006] The object of the present application is achieved as follows: [0007] The jet experiment bench for measurement of temperature field of an engine piston includes a frame, a fixed smoke discharging pipe, a movable smoke discharging pipe, a combustion hood, a combustion cup and a lifting plate. The frame includes a module A and a module B, wherein the module A is installed above the module B, and the module B is provided with a short-stroke linear motion module, the lifting plate is connected to the short-stroke linear motion module, a piston supporting pipe is installed on the lifting plate, and a test piston is installed on the piston supporting pipe via a piston seat, the movable smoke discharging pipe, the combustion hood and the combustion cup constitute a combustion chamber, and the test piston is driven by the lifting plate to protrude into the combustion chamber or protrude beyond the bottom of the combustion chamber, a top of the movable smoke discharging pipe is located in the fixed smoke discharging pipe.
[0008] The application may also include: [0009] 1. A nozzle is installed on the combustion hood, and the nozzle is disposed in an offset arrangement.
[0010] 2. A long-stroke linear motion module is installed on the module A, and the combustion chamber is connected to the long-stroke linear motion module.
[0011] 3. The short-stroke linear motion module is a ball-screw linear motion mechanism.
[0012] 4. The long-stroke linear motion module is a ball-screw linear motion mechanism.
[0013] 5. The jet experiment bench further including a module C and a module D, wherein the module C is located beside the module A, the module D is located beside the module B, the module C is located above the module D, and the module A, the module B, the module C and the module D are connected via module connection members; the module C includes an upper layer on which an electric control system is installed and a lower layer on which other test devices are installed, and the module D is provided with a cooling water tank.
[0014] The present application is advantageous in that: [0015] 1. The present application adopts the method of heating the piston with acetylene and oxygen, a stable temperature adjustment can be achieved in a larger range, which can be adapted to experiment research in multiple working conditions, by means of control mechanisms such as an electronically controlled throttle valve.
[0016] 2. The present application adopts a modular design, which not only can realize quick installation, but also can extend other functional modules, thereby being beneficial to the function extension of the structure.
[0017] 3. In the present application, automatic control is adopted for installation of the piston and adjustment of piston positions, so that different pistons with the same cylinder diameter can be experimented, thereby greatly reducing installation errors and safety risks caused by human operation.
[0018] 4. In the present application, the pads are designed in a standardized manner, which greatly reduces the number of pads and facilitates the assembly and maintenance of the device.
BRIEF DESCRIPTION OF THE DRAWINGS
[0019] FIG. 1 is a structural diagram of the present application; [0020] FIG. 2a is a front view of the present application; [0021] FIG. 2b is a side view of the present application; [0022] FIG. 2c is a top view of the present application; [0023] FIG. 3a is a structural diagram of a module A in an acetylene-oxygen configuration involved in the present application; [0024] FIG. 3b is a structural diagram of a module A in a turbojet engine configuration involved in the present application; [0025] FIG. 4 is a partial sectional view of a combustion chamber in the module A in the acetylene-oxygen configuration involved in the present application; [0026] FIG. 5 is a structural diagram of a module B; [0027] FIG. 6 is a structural diagram of a module C; [0028] FIG. 7 is a structural diagram of a module D.
DETAILED DESCRIPTION OF THE EMBODIMENTS
[0029] The present application is described below in more detail with reference to the accompanying drawings: [0030] With reference to FIGS. 1-7, the present application mainly includes a fixed smoke discharging pipe 1, a movable smoke discharging pipe 2, a combustion hood 3, a combustion cup 4, a shod-stroke linear motion module 5, a long-stroke linear motion module 6, a test piston 7, a piston seat 8, module connection members 9 and lifting rings 10.
[0031] A smoke discharging system is composed of the fixed smoke discharging pipe 1 and a movable smoke discharging pipe 2. In order to prevent a high-temperature gas from damaging the smoke discharging system, both the fixed smoke discharging pipe 1 and the movable smoke discharging pipe 2 are made of heat-resistant alloy steel.
[0032] A combustion chamber is composed of the movable smoke discharging pipe 2, the combustion hood 3, the combustion cup 4, and the test piston 7. In the structure of the combustion chamber, the most main function of the movable smoke discharging pipe 2 is to discharge high-temperature exhaust gas generated by heating the piston with an acetylene flame into the fixed smoke discharging pipe 1, and then cool the high-temperature exhaust gas and discharge it into an external space, so as to prevent a fault of the experiment bench due to a continuous high temperature.
[0033] The parts in direct contact with the flame, the combustion hood 3 and the combustion cup 4 are both made of ceramic, and a nozzle is installed on the combustion hood 3 in an offset arrangement so as to generate a certain vortex in the combustion chamber, thereby facilitating the diffusion of the flame and the uniformity of temperature.
[0034] In order to facilitate adjustment of the position of the test piston 7, observation of the combustion effect, and installation of test devices, the positions of some parts of the combustion chamber can be adjusted by means of the long-stroke linear motion module 6 on the frame.
[0035] The test piston 7 is installed on the piston seat 8, and the piston seat Scan load the piston into or unload the piston out of the combustion chamber under the drive of the short-stroke linear motion module 5.
[0036] The frame is formed by steel square pipes welded together, and is generally divided into four portions. Each portion of the frame is connected with module connection members 9, and the connection surfaces are ground and machined to ensure that the surfaces are flat, so as to prevent excessive motion resistance caused by welding deformation.
[0037] The lifting rings 10 for hanging are installed on the top of the experiment bench, which facilitates the transportation and installation of the experiment bench on the experiment site.
[0038] The experiment bench can be compatible with measurement protocols of the temperature field of the piston developed based on micro turbojet engine.
[0039] The mechanical structure of the jet experiment bench is divided into four main modules, wherein a module A is provided with an actuating mechanism required in the experiment process, including a flame nozzle and a combustion chamber, etc.; A module B is provided with a piston and a support structure for the piston, and a linear motion module in the module B can push the piston into a cylinder sleeve or take the piston out of the cylinder sleeve; A module C is used for storing lighter experiment devices on the experiment site and a control system for the experiment bench, and a larger internal space of the module C can support the installation of other test devices, so that test personnel can collect other experiment data; A module D is used for supporting the module C and storing heavier test devices on the experiment site. Detailed description of each module is as follows: [0040] 1. Module A [0041] The module A mainly supports the combustion chamber and a smoke discharging mechanism. In order to facilitate the adjustment of the piston to observe the combustion effect and to facilitate the installation of the test devices, positions of some parts of the combustion chamber can be adjusted by means of a lifting mechanism on the frame, and the structure of the module A is as shown in FIG. 3a. [0042] The frame is formed by steel square pipes welded together, and is generally divided into four portions; a connection plate for guaranteeing the connection precision is provided between each portion of the frame; and the connection surfaces are ground and machined to ensure that the surfaces are flat as the existence of the linear motion mechanism which having higher requirement on the assembling precision. However, if the integral welding is used, the linearity of the square pipes supporting the linear motion module cannot be ensured, so that the motion resistance is increased.
[0043] In addition, the module A can be compatible with measurement protocols of the temperature field of the piston developed based on micro turbojet engine. If a module A in turbojet configuration is used, the module A in acetylene-oxygen combustion configuration only needs to be changed simply, and the turbojet module can be inserted into the module A in acetylene-oxygen combustion configuration to form the module A in turbojet configuration. The conversion from the module A in acetylene-oxygen combustion configuration to the module A in turbojet configuration does not need to replace the module, and only a part of the structure of the module A in acetylene-oxygen combustion configuration needs to be changed. The module A in turbo-jet configuration is shown in FIG. 3b.
[0044] The key structure in the module A is the combustion chamber, and the combustion chamber is composed of a movable smoke discharging pipe, a combustion hood, a nozzle and a combustion cup. The structure of the combustion chamber is as shown in FIG. 4. In the structure of the combustion chamber, the most important role of the movable smoke discharging pipe is to discharge heat, and the residual heat after the piston is heated by the acetylene flame needs to be discharged to the external space, otherwise, the experiment bench will fail as the continuous high temperature. In order to prevent the high-temperature flame from damaging the structure of the combustion chamber, the movable discharging pipe will be made of steel. In addition, the parts in direct contact with the flame are all made of ceramics. The nozzle is arranged in an offset manner so as to generate a little swirl in the combustion chamber, thereby facilitating the diffusion of the flame and the uniformity of the temperature. It should be noted that, after the nozzle angle is determined, the hole for installing the nozzle needs to be sealed by fire-proof and explosion-proof mud, so as to prevent the flame from slipping out of the combustion chamber.
[0045] 2. Module B [0046] In view of the fact that the piston needs to be repetitively clamped during the experiment, how to achieve quick installation of the piston must be considered. The individual piston installed in the experiment bench needs to be connected to the oil pipes of the cooling oil path and the wires of the thermocouples, therefore the arrangement of the oil pipes and wires should also be considered. In order to meet the above requirements, a ball-screw linear motion module is designed on the frame for pushing in and pulling out the piston, and the structure of the module B is as shown in FIG. 5.
[0047] wherein the lifting plate is connected to two ball-screw linear motion modules, and is connected to the piston supporting pipe via bolts, the piston is placed on the upper portion of the piston supporting pipe, and the oil path and the wires are connected to the outside through the inner space of the piston supporting pipe. When the lifting plate moves downwards, the piston is pulled out of the combustion chamber, and the operator only needs to remove the connecting screws between the piston and the piston supporting pipe to complete the replacement of the piston.
[0048] 3. Module C [0049] The module C is divided into an upper layer and a lower layer (as shown in FIG. 6), wherein the electric control system of the experiment bench is installed on the upper layer, and other test devices required during the experiment are installed on the lower layer. The space of the lower-layer can be used to extend functions of the experiment bench, and the experiment personnel can install other test devices therein to obtain other experiment parameters that cannot be obtained in the original data collection system of the experiment bench. The periphery of the module C is wrapped by fireproof and heat-insulating plates, which can effectively avoid the interference of the high temperature of the fuel gas on the electric control system during the experiment.
[0050] 4. Module D [0051] The module D is used for supporting the module C and placing heavier devices required during the experiment. In an experiment site lacking a cooling water tower, in addition to placing a cooling oil pump, the module D also needs to place a cooling water tank and a water pump. In an experiment site with a cooling water tower, the module D is only used for placing a cooling oil pump, and the structure of the module D is as shown in FIG. 7.
Claims (6)
- Claims 1. A jet experiment bench for measurement of temperature field of an engine piston, characterized in that, the jet experiment bench comprises a frame, a fixed smoke discharging pipe, a movable smoke discharging pipe, a combustion hood, a combustion cup and a lifting plate, the frame comprises a module A and a module B, wherein the module A is installed above the module B, and the module B is provided with a short-stroke linear motion module, the lifting plate is connected to the short-stroke linear motion module, a piston supporting pipe is installed on the lifting plate, and a test piston is installed on the piston supporting pipe via a piston seat, and the movable smoke discharging pipe, the combustion hood and the combustion cup constitute a combustion chamber, and the test piston is driven by the lifting plate to protrude into the combustion chamber or protrude beyond the bottom of the combustion chamber, and a top of the movable smoke discharging pipe is located in the fixed smoke discharging pipe.
- 2. The jet experiment bench for measurement of temperature field of the engine piston according to claim 1, characterized in that a nozzle is installed on the combustion hood, and the nozzle is disposed in an offset arrangement.
- 3. The jet experiment bench for measurement of temperature field of the engine piston according to claim 1, characterized in that a long-stroke linear motion module is installed on the module A, and the combustion chamber is connected to the long-stroke linear motion module.
- 4. The jet experiment bench for measurement of temperature field of the engine piston according to claim 1, characterized in that the shod-stroke linear motion module is a ball-screw linear motion mechanism.
- 5. The jet experiment bench for measurement of temperature field of the engine piston according to claim 3, characterized in that the long-stroke linear motion module is a ball-screw linear motion mechanism.
- 6. The jet experiment bench for measurement of temperature field of the engine piston according to claim 1, characterized in that, the jet experience bench further comprises a module C and a module D, wherein the module C is located beside the module A, the module D is located beside the module B, the module C is located above the module D, and the module A, the module B, the module C and the module D are connected via module connection members; the module C comprises an upper layer on which an electric control system is installed and a lower layer on which other test devices are installed, and the module D is provided with a cooling water tank.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210384024.6A CN114894487A (en) | 2022-04-12 | 2022-04-12 | Jet flow experiment table body applied to engine piston temperature field measurement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB202304227D0 GB202304227D0 (en) | 2023-05-10 |
| GB2618669A true GB2618669A (en) | 2023-11-15 |
Family
ID=82716672
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2304227.8A Pending GB2618669A (en) | 2022-04-12 | 2023-03-23 | Jet experiment bench for measurement of temperature field of engine piston |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN114894487A (en) |
| GB (1) | GB2618669A (en) |
| ZA (1) | ZA202304274B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114894487A (en) * | 2022-04-12 | 2022-08-12 | 哈尔滨工程大学 | Jet flow experiment table body applied to engine piston temperature field measurement |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110779700A (en) * | 2019-11-12 | 2020-02-11 | 湖南江滨机器（集团）有限责任公司 | Piston excircle wear test device |
| CN114894487A (en) * | 2022-04-12 | 2022-08-12 | 哈尔滨工程大学 | Jet flow experiment table body applied to engine piston temperature field measurement |
-
2022
- 2022-04-12 CN CN202210384024.6A patent/CN114894487A/en active Pending
-
2023
- 2023-03-23 GB GB2304227.8A patent/GB2618669A/en active Pending
- 2023-04-11 ZA ZA2023/04274A patent/ZA202304274B/en unknown
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110779700A (en) * | 2019-11-12 | 2020-02-11 | 湖南江滨机器（集团）有限责任公司 | Piston excircle wear test device |
| CN114894487A (en) * | 2022-04-12 | 2022-08-12 | 哈尔滨工程大学 | Jet flow experiment table body applied to engine piston temperature field measurement |
Also Published As
| Publication number | Publication date |
|---|---|
| GB202304227D0 (en) | 2023-05-10 |
| ZA202304274B (en) | 2023-12-20 |
| CN114894487A (en) | 2022-08-12 |
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