CN110108493B - In-cylinder flow analysis visual measuring device - Google Patents
In-cylinder flow analysis visual measuring device Download PDFInfo
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- CN110108493B CN110108493B CN201910261238.2A CN201910261238A CN110108493B CN 110108493 B CN110108493 B CN 110108493B CN 201910261238 A CN201910261238 A CN 201910261238A CN 110108493 B CN110108493 B CN 110108493B
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- 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
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Abstract
The invention provides an in-cylinder flow analysis visual measuring device, which comprises a controller, a gas circuit system, a particle generator, a trace particle inlet, a pressure sensor, a transparent cylinder and a shooting device, wherein the controller is connected with the gas circuit system; the gas path system comprises a gas inlet valve, a gas inlet pipe, a fan, a gas outlet pipe and a gas outlet valve which are connected in sequence; the air outlet pipe comprises a first air outlet pipe and a second air outlet pipe, the first air outlet pipe is communicated with the second air outlet pipe through a transparent cylinder, and the second air outlet pipe is communicated with the atmosphere; one end of the first air outlet pipe, which is close to the transparent cylinder, is sequentially provided with a trace particle inlet and a pressure detection hole; the shooting device is arranged relative to the transparent cylinder. The invention changes the air intake and air suction measuring mode into the air blowing measuring mode, and the air intake measuring mode is changed to solve the problem of damage of tracer particles to the flow meter, thereby realizing the consistency with the air intake mode of an actual engine, ensuring the cleanness of most pipelines of a test bed, and maintaining the service lives of the pipeline flow meter and the pipelines.
Description
Technical Field
The invention belongs to the technical field of testing of an in-cylinder flow field of an engine, and particularly relates to a visual measuring device for in-cylinder flow analysis.
Background
The air passage steady flow test bed is an important test platform for researching the influence of the air inlet passage structure, the design of an air valve, a valve seat and the like on the intake vortex intensity and the vortex forming process, can conveniently measure the flow coefficient and the vortex intensity of an air passage, can research the flow velocity distribution of two intake valves at the outlets of the two intake valves and the rule of mutual interference action of the two intake valves in a short time by adopting the modern optical measurement technology, can visually measure and analyze the forming process of the intake vortex, and can obtain the real vortex intensity. Besides, the flow field information in the whole cylinder is not interfered by cyclic variation factors, and a basis is provided for designing the outlet areas of the air inlet channel and the air inlet valve.
So far, research and test work of people on an air passage steady flow test bed is mostly limited to the evaluation of the flow coefficient and the vortex intensity of an air passage, and the research on the flow velocity distribution of an air valve outlet and the motion law of in-cylinder vortex is not much for an air passage structure (especially a double-air-inlet-passage structure), so that the in-cylinder vortex motion law and the influence law of the air passage and the air valve design are not known so much. Moreover, because of the complexity of in-cylinder vortex motion, the rotational speed of the blade anemometer is not the true vortex rotational speed, causing a problem of accuracy in traditional airway vortex intensity evaluation.
The invention aims to establish a PIV test system by performing in-cylinder flow field visual transformation on a steady flow air passage test bed. Through a PIV testing means, an in-cylinder flow field under a steady flow air passage testing condition is measured, eddy motion law analysis of different sections in the cylinder is carried out, an in-cylinder eddy forming process is described, and guidance is provided for air inlet channel design. And by comparing with the air blowing test data of the steady flow air passage, the relationship between the vortex intensity measured by the PIV in the cylinder and the vortex intensity obtained by the air blowing test is established, and the steady flow evaluation method of the air passage vortex intensity is perfected.
Disclosure of Invention
In view of this, the invention aims to provide an in-cylinder flow analysis visual measurement device, which improves an exhaust measurement system of an engine into a PIV gas flow pipeline, only generates tracer particles in an air cylinder and an exhaust pipe, and reduces the pollution and damage of the tracer particles to an engine pipeline.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a visual measuring device for in-cylinder flow analysis comprises a controller, a gas path system, a particle generator, a trace particle inlet, a pressure sensor, a transparent cylinder and a shooting device;
the gas path system comprises a gas inlet valve, a gas inlet pipe, a fan, a gas outlet pipe and a gas outlet valve;
the air inlet valve is arranged on the air inlet pipe, one end of the air inlet pipe is communicated with the atmosphere, and the other end of the air inlet pipe is communicated with the inlet of the fan;
the air outlet pipe comprises a first air outlet pipe and a second air outlet pipe, one end of the first air outlet pipe is communicated with the outlet of the fan, and the other end of the first air outlet pipe is connected to the air inlet of the transparent cylinder; one end of the second air outlet pipe is communicated with an air outlet of the transparent cylinder, the other end of the second air outlet pipe is communicated with the atmosphere, and the air outlet valve is arranged on the air outlet pipe;
a trace particle inlet and a pressure detection hole are sequentially formed in one end, close to the transparent cylinder, of the first air outlet pipe, the particle generator is connected with the trace particle inlet, and the pressure sensor is installed in the pressure detection hole;
the shooting device is arranged relative to the transparent cylinder;
and the air inlet valve, the air outlet valve, the tracing particle generator, the pressure sensor and the shooting device are in signal connection with the controller.
Furthermore, the gas circuit system also comprises a pressure stabilizing box, and one end of the second gas outlet pipe is communicated with the gas outlet of the transparent cylinder through the pressure stabilizing box.
Furthermore, the gas circuit system also comprises a flowmeter, and the flowmeter is installed on the gas inlet pipe.
Furthermore, the shooting device comprises a CCD camera, a laser and a reflector;
the laser device is arranged relative to the transparent cylinder, the reflector is 45 degrees and located under the transparent cylinder, the width of the reflector is not smaller than the diameter of the transparent cylinder, and the CCD camera receives light rays reflected by the reflector.
Furthermore, the reflector is fixedly supported by a reflector support, the reflector support comprises a 45-degree clamping groove and a screw rod, and the clamping groove is fixed on the pressure stabilizing box in a lifting mode through the screw rod.
Further, the gas circuit system further comprises a vent pipe and a vent valve, wherein the vent pipe is provided with the vent valve, one end of the vent pipe is communicated with the air outlet of the fan, and the other end of the vent pipe is communicated with the atmosphere.
Further, the admission valve in the intake pipe is installed in the atmospheric one end of this intake pipe intercommunication, and this intake pipe divide into two the tunnel between fan and admission valve, is main intake pipe all the way, and another way is the assistance intake pipe, main intake pipe diameter is greater than the assistance intake pipe diameter, the flowmeter includes major flowmeter and little flowmeter, and is equipped with major control valve and large-traffic gauge in the main intake pipe, is equipped with the assistance control valve and little flowmeter in the assistance intake pipe.
Furthermore, the gas path system also comprises a supplementary pipeline, the supplementary pipeline is connected between the inner end of the gas inlet valve and the pressure stabilizing box, and a supplementary control valve is arranged on the supplementary pipeline.
The air inlet valve, the air outlet valve, the exhaust valve, the main path control valve, the auxiliary path control valve and the supplementary control valve are all pneumatic valves.
Compared with the prior art, the in-cylinder flow analysis visual measuring device has the following advantages:
(1) according to the in-cylinder flow analysis visual measuring device, the intake measurement is realized by utilizing the test bed exhaust measuring system, the intake air suction measuring mode is changed into the blowing measuring mode according to the actual engine intake mode, the intake measuring mode is changed to solve the problem of damage of trace particles to the flow meter, the intake measuring mode is consistent with the actual engine intake mode, most pipelines of the test bed are guaranteed to be clean, and the service lives of the pipeline flow meter and the pipelines are kept.
(2) According to the in-cylinder flow analysis visual measuring device, the trace particle inlet and the air inlet pressure sensor are processed on the air manifold before entering the cylinder sleeve, so that the concentration of the air inlet trace particles can be adjusted more accurately, and the air inlet pressure can be measured accurately.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the invention without limitation. In the drawings:
fig. 1 is a schematic connection diagram of a visualized measuring device for in-cylinder flow analysis according to an embodiment of the present invention;
fig. 2 is a schematic view of an installation of a photographing device of an in-cylinder flow analysis visualization measuring device according to an embodiment of the present invention.
Description of reference numerals:
1-a controller; 2-a gas circuit system; 21-an air inlet valve; 22-an air inlet pipe; 23-a fan; 24-an air outlet pipe; 25-an air outlet valve; 26-a flow meter; 27-an exhaust pipe; 28-exhaust valve; 29-a supplementary conduit; 3-a particle generator; 31-a trace particle inlet; 4-a pressure sensor; 5-a transparent cylinder; 6-a shooting device; 61-CCD camera; 62-a laser; 63-a mirror; 64-mirror support; 7-pressure stabilizing box.
The gas path system comprises
Detailed Description
It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings, which are merely for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
In the description of the invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "connected" are to be construed broadly, e.g. as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.
The invention will be described in detail with reference to the following embodiments with reference to the attached drawings.
As shown in fig. 1 and 2, the present invention provides a visual measurement device for in-cylinder flow analysis, which includes a controller 1, a gas path system 2, a particle generator 3, a trace particle inlet 31, a pressure sensor 4, a transparent cylinder 5 and a shooting device 6;
the gas path system 2 comprises a gas inlet valve 21, a gas inlet pipe 22, a fan 23, a gas outlet pipe 24 and a gas outlet valve 25;
the air inlet valve 21 is arranged on an air inlet pipe 22, one end of the air inlet pipe 22 is communicated with the atmosphere, and the other end of the air inlet pipe 22 is communicated with an inlet of a fan 23;
the air outlet pipe 24 comprises a first air outlet pipe and a second air outlet pipe, one end of the first air outlet pipe is communicated with the outlet of the fan 23, and the other end of the first air outlet pipe is connected to the air inlet of the transparent cylinder 5; one end of the second air outlet pipe is communicated with an air outlet of the transparent cylinder 5, the other end of the second air outlet pipe is communicated with the atmosphere, and the air outlet valve 25 is arranged on the air outlet pipe 24;
a trace particle inlet 31 and a pressure detection hole are sequentially formed in one end, close to the transparent cylinder 5, of the first air outlet pipe, the particle generator 3 is connected with the trace particle inlet 31, the pressure sensor 4 is installed in the pressure detection hole, and the pressure sensor 4 is closer to the transparent cylinder 5;
the shooting device 6 is arranged opposite to the transparent cylinder 5;
and the air inlet valve 21, the air outlet valve 25, the trace particle generator 3, the pressure sensor 4 and the shooting device 6 are in signal connection with the controller.
Further, the gas circuit system 2 further comprises a pressure stabilizing box 7, and one end of the second gas outlet pipe is communicated with the gas outlet of the transparent cylinder 5 through the pressure stabilizing box 7.
Further, the gas circuit system 2 further includes a flow meter 26, and the flow meter 26 is mounted on the gas inlet pipe 21.
Further, the shooting device 6 comprises a CCD camera 61, a laser 62, a mirror 63;
the laser 62 is arranged opposite to the transparent cylinder 5, the reflective mirror 63 is at an angle of 45 degrees and is positioned right below the transparent cylinder 5, the width of the reflective mirror 63 is not smaller than the diameter of the transparent cylinder 5, and the CCD camera 61 receives light rays reflected by the reflective mirror 63.
Further, the reflector 63 is fixedly supported by a reflector support 64, and the reflector support 64 comprises a 45-degree clamping groove and a screw rod, and the clamping groove is fixed on the pressure stabilizing box 7 in a lifting manner through the screw rod.
Further, the gas path system 2 further comprises a gas exhaust pipe 27 and a gas exhaust valve 28, wherein the gas exhaust pipe 27 is provided with the gas exhaust valve 28, one end of the gas exhaust pipe 27 is communicated with the gas outlet of the blower 23, and the other end of the gas exhaust pipe 27 is communicated with the atmosphere.
Further, the admission valve 21 in the intake pipe 22 is installed in the atmospheric one end of this intake pipe 22 intercommunication, and this intake pipe 22 divide into two the tunnel between fan 23 and admission valve 21, is main intake pipe all the way, and another way is for assisting the intake pipe, main intake pipe diameter is greater than and assists the intake pipe diameter, flowmeter 26 includes big flowmeter and little flowmeter, and is equipped with main control valve and large-traffic meter in the main intake pipe, is equipped with subsidiary control valve and little flowmeter in the subsidiary intake pipe.
Further, the gas path system 2 further includes a supplementary duct 29, the supplementary duct 29 is connected between the inner end of the air inlet valve 21 and the surge tank 7, and a supplementary control valve is disposed on the supplementary duct 29.
The invention aims to establish a PIV test system by performing in-cylinder flow field visual transformation on a steady flow air passage test bed. An exhaust measurement system is improved into a PIV gas flow pipeline, and the PIV gas flow pipeline is used for measuring the flow field in the cylinder;
the method comprises the steps of firstly opening an air inlet valve, a main path control valve (or an auxiliary path control valve) and an air outlet valve, closing a supplementary control valve and an exhaust valve, wherein a detachable hose is arranged between the exhaust valve and the air outlet valve, the hose is disconnected, a gas outlet pipeline on the left side of the disconnected hose is connected to an inlet of a cylinder cover through the hose, an outlet of a transparent cylinder is communicated with an inlet of a pressure stabilizing box through the hose, then the air outlet valve is communicated with an outlet of the pressure stabilizing box, namely the transparent cylinder is communicated with the atmosphere through the pressure stabilizing box and the air outlet valve, gas enters from the air inlet valve, and.
The PIV shooting system comprises a CCD camera, a laser and a reflector, wherein a transparent cylinder comprises a quartz stone glass cylinder sleeve, the diameter of the quartz stone glass cylinder sleeve is 10mm, the reflecting angle of the reflector is 45 degrees, the width of the reflector is suitable for the diameter of a complete reflecting cylinder barrel, and the reflector is supported by a reflector support.
The reflector support is provided with a 45-degree angle clamping groove according to the width of the reflector, the clamping groove is fixed on the bottom plane of the pressure stabilizing box through a screw, and the height of the reflector support is adjusted through the length of the screw.
And (3) processing a trace particle inlet at the inlet of the cylinder cover connected with the hose, processing a gas pressure test port behind the trace particle inlet, and loading a pressure sensor to test the gas pressure at the inlet. The concentration of trace particles is adjusted through a particle generator, a proper amount of trace particles are mixed into gas of a cylinder cover, a PIV testing system such as a CCD camera and a laser is used for shooting a flow field diagram of the trace particles on a fixed surface in a cylinder barrel, and the motion rule of vortex in the cylinder under different air passage structure conditions is obtained.
Through a PIV testing means, an in-cylinder flow field under a steady flow air passage testing condition is measured, eddy motion law analysis of different sections in the cylinder is carried out, an in-cylinder eddy forming process is described, and guidance is provided for air inlet channel design. And by comparing with the air blowing test data of the steady flow air passage, the relationship between the vortex intensity measured by the PIV in the cylinder and the vortex intensity obtained by the air blowing test is established, and the steady flow evaluation method of the air passage vortex intensity is perfected
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the invention, so that any modifications, equivalents, improvements and the like, which are within the spirit and principle of the present invention, should be included in the scope of the present invention.
Claims (7)
1. The utility model provides a visual measuring device of in-cylinder flow analysis which characterized in that: the device comprises a controller, a gas circuit system, a particle generator, a trace particle inlet, a pressure sensor, a transparent cylinder and a shooting device;
the gas path system comprises a gas inlet valve, a gas inlet pipe, a fan, a gas outlet pipe and a gas outlet valve;
the air inlet valve is arranged on the air inlet pipe, one end of the air inlet pipe is communicated with the atmosphere, and the other end of the air inlet pipe is communicated with the inlet of the fan;
the air outlet pipe comprises a first air outlet pipe and a second air outlet pipe, one end of the first air outlet pipe is communicated with the outlet of the fan, and the other end of the first air outlet pipe is connected to the air inlet of the transparent cylinder; one end of the second air outlet pipe is communicated with an air outlet of the transparent cylinder, the other end of the second air outlet pipe is communicated with the atmosphere, and the air outlet valve is arranged on the air outlet pipe;
a trace particle inlet and a pressure detection hole are sequentially formed in one end, close to the transparent cylinder, of the first air outlet pipe, the particle generator is connected with the trace particle inlet, and the pressure sensor is installed in the pressure detection hole;
the shooting device is arranged relative to the transparent cylinder;
the air inlet valve, the air outlet valve, the tracing particle generator, the pressure sensor and the shooting device are in signal connection with the controller;
the shooting device comprises a CCD camera, a laser and a reflector; the laser device is arranged relative to the transparent cylinder, the reflector is 45 degrees and located under the transparent cylinder, the width of the reflector is not smaller than the diameter of the transparent cylinder, and the CCD camera receives light rays reflected by the reflector.
2. The in-cylinder flow analysis visualization measuring device according to claim 1, characterized in that: the gas circuit system further comprises a pressure stabilizing box, and one end of the second gas outlet pipe is communicated with the gas outlet of the transparent cylinder through the pressure stabilizing box.
3. The in-cylinder flow analysis visualization measuring device according to claim 1, characterized in that: the gas circuit system further comprises a flowmeter, and the flowmeter is installed on the gas inlet pipe.
4. The in-cylinder flow analysis visualization measuring device according to claim 1, characterized in that: the reflector is fixedly supported by a reflector support, the reflector support comprises a 45-degree clamping groove and a screw rod, and the clamping groove is fixed on the pressure stabilizing box in a lifting mode through the screw rod.
5. The in-cylinder flow analysis visualization measuring device according to claim 1, characterized in that: the air path system further comprises an exhaust pipe and an exhaust valve, wherein the exhaust valve is arranged on the exhaust pipe, one end of the exhaust pipe is communicated with the air outlet of the fan, and the other end of the exhaust pipe is communicated with the atmosphere.
6. The in-cylinder flow analysis visualization measuring device according to claim 3, characterized in that: the air inlet valve in the air inlet pipe is installed at one end of the air inlet pipe communicated with the atmosphere, the air inlet pipe is divided into two paths between the fan and the air inlet valve, one path is a main air inlet pipe, the other path is an auxiliary air inlet pipe, the diameter of the main air inlet pipe is larger than that of the auxiliary air inlet pipe, the flowmeter comprises a large flowmeter and a small flowmeter, a main control valve and a large flowmeter are arranged on the main air inlet pipe, and an auxiliary control valve and a small flowmeter are arranged on the auxiliary air inlet pipe.
7. The in-cylinder flow analysis visualization measuring device according to claim 1, characterized in that: the gas path system also comprises a supplementary pipeline, the supplementary pipeline is connected between the inner end of the gas inlet valve and the pressure stabilizing box, and a supplementary control valve is arranged on the supplementary pipeline.
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| CN201910261238.2A CN110108493B (en) | 2019-04-02 | 2019-04-02 | In-cylinder flow analysis visual measuring device |
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| CN201910261238.2A CN110108493B (en) | 2019-04-02 | 2019-04-02 | In-cylinder flow analysis visual measuring device |
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| CN113340602B (en) * | 2021-07-06 | 2023-01-24 | 天津大学 | Visual variable-volume bomb device capable of realizing multi-directional observation and method |
| CN113405801B (en) * | 2021-08-19 | 2021-12-21 | 潍柴动力股份有限公司 | Rolling flow test tool and rolling flow test equipment |
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| CN201637579U (en) * | 2010-03-09 | 2010-11-17 | 东风本田发动机有限公司 | Air supply system of engine air passage flow stabilizing test device |
| CN205352701U (en) * | 2016-01-29 | 2016-06-29 | 天津大学 | A reflector subassembly for optical engine laser test image acquisition |
| CN105973611B (en) * | 2016-04-29 | 2018-07-03 | 西安交通大学 | A kind of visualization in-cylinder direct-jet Fast Compression combustion experimental device |
| CN106441911B (en) * | 2016-06-29 | 2019-01-04 | 中国北方发动机研究所(天津) | Diesel engine intake swirl adjustable test device |
| CN107576507B (en) * | 2017-11-02 | 2024-04-02 | 西华大学 | Optical engine visualization system for simulating active control compression ignition and simulation method thereof |
| DE102017129171A1 (en) * | 2017-12-07 | 2018-02-08 | FEV Europe GmbH | A method of aging a component of an exhaust aftertreatment system |
| CN108254197A (en) * | 2017-12-08 | 2018-07-06 | 中国北方发动机研究所(天津) | A kind of human bronchial epithelial cells optic test probe material processing unit |
| CN108303260A (en) * | 2018-01-08 | 2018-07-20 | 广州汽车集团股份有限公司 | Air flue test stand |
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