CN112781884A - Rotor engine air flue flow stabilization test device - Google Patents
Rotor engine air flue flow stabilization test device Download PDFInfo
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- CN112781884A CN112781884A CN202011521411.7A CN202011521411A CN112781884A CN 112781884 A CN112781884 A CN 112781884A CN 202011521411 A CN202011521411 A CN 202011521411A CN 112781884 A CN112781884 A CN 112781884A
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- 238000004088 simulation Methods 0.000 claims abstract description 26
- 239000011521 glass Substances 0.000 claims description 35
- 238000007789 sealing Methods 0.000 claims description 11
- 238000005259 measurement Methods 0.000 claims description 5
- 230000003287 optical effect Effects 0.000 claims description 5
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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
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Abstract
The invention provides a rotor engine air flue steady flow test device which comprises a rotor engine test piece, a wiring harness, a CCD camera, a synchronizer, a controller, a pressure stabilizing box pressure sensor, a pressure stabilizing box, a gas flowmeter, a fan, a pipeline, a blade anemograph, a simulation cylinder sleeve, an atmospheric pressure sensor and an atmospheric temperature sensor. Based on the principle of an air passage steady flow test, the invention generates stable pressure difference through a fan, obtains theoretical flow through a Bernoulli equation through pressure and temperature measurement at two ends of an air inlet of a rotor engine, obtains actual gas flow through a gas flowmeter in front of the fan, measures vortex through a vane anemometer, and further can accurately calculate the flow coefficient and the vortex ratio of the air inlet, is used for evaluating the circulation capacity of the air inlet of the rotor engine, and measures the internal flow field of a rotor engine test piece through a CCD (charge coupled device) camera to evaluate the cylinder flow capacity of the air inlet and guide the design of the air inlet.
Description
Technical Field
The invention relates to the technical field of internal combustion engines, in particular to a steady flow test device for an air passage of a rotor engine.
Background
In modern internal combustion engines, the air flow movement plays a very important role. The combustion process quality of various internal combustion engines is related to the motion states of air, oil gas and gas to different degrees or even to a great extent.
The movement of the air flow in the cylinder during the intake process is complicated. The valve not only changes along with the rotation angle of a crankshaft and the gas distribution phase, but also changes along with the radial and axial positions of the cylinder; and it changes the flow speed and moving direction, and the rotating center and flow state are also changed.
The rotor engine uses the rotation of the rotor to do work and directly outputs power, and because the reciprocating motion of the piston and a crank connecting rod assembly are eliminated, a complex air distribution mechanism is not needed to drive the air valve, and dozens of moving parts are eliminated, the structure of the engine is greatly simplified, the parts are fewer, the size is small, the weight is light, the power-to-weight ratio of the engine is obviously improved, and the power-to-weight ratio of the engine is improved by more than 50 percent compared with that of the traditional piston reciprocating engine.
However, since the intake and exhaust ports are arranged at fixed positions on the engine body and no valve train is provided, the conventional airway steady flow test cannot measure the performance of the airway of the rotor engine. Therefore, rotor engine port performance measurements are a major concern in the development of rotor engines.
Disclosure of Invention
The invention provides a rotor engine air passage steady flow test device, which is characterized in that on one hand, by the principle of an air passage steady flow test, theoretical flow and actual flow generated by an air inlet of a rotor engine under certain pressure difference are tested and calculated to obtain a flow coefficient of the air inlet; on the other hand, the blade anemograph is used for collecting the strength of vortex generated by the air inlet under a certain pressure difference, and the microscopic characteristics of the in-cylinder flow field can be obtained by an optical speed measurement method.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a rotor engine air flue flow stabilization test device comprises a rotor engine test piece, a wiring harness, a synchronizer, a controller, a pressure stabilizing box pressure sensor, a pressure stabilizing box, a gas flowmeter, a fan, a pipeline, a blade anemometer, a simulation cylinder sleeve, an atmospheric pressure sensor and an atmospheric temperature sensor;
the upper end of the simulation cylinder sleeve is provided with a rotor engine test piece, the lower end of the simulation cylinder sleeve is communicated with a pressure stabilizing box, the vane anemoscope is arranged in the simulation cylinder sleeve and is arranged right below the rotor engine test piece, and an engine rotor in the rotor engine test piece is communicated with the inside of the simulation cylinder sleeve;
a CCD camera is arranged above an air inlet of the rotor engine test piece, a laser is arranged on the side part of the air inlet of the rotor engine test piece, the CCD camera and the laser are connected with a synchronizer through a wiring harness, a fan is connected with a pressure stabilizing box through a pipeline, and a gas flowmeter is arranged on the pipeline;
pressure stabilizing box pressure sensor, atmospheric pressure sensor and atmospheric temperature sensor all install on the pressure stabilizing box, and pressure stabilizing box pressure sensor, atmospheric temperature sensor, gas flowmeter and synchronous ware all pass through the pencil and connect in the controller.
Further, the rotary engine test piece comprises a glass cylinder body, an engine rotor, a glass end cover and a sealing end cover, wherein the engine rotor is installed in the glass cylinder body, the glass end cover is detachably fixed at the upper end of the glass cylinder body, the sealing end cover is fixed at the lower end of the glass cylinder body, a hollow cavity is formed in the sealing end cover and is communicated with the simulation cylinder sleeve, the top surface of the simulation cylinder sleeve is sealed, an air inlet and an air outlet are formed in the glass cylinder body, the air outlet is sealed through a plug, and the air inlet is communicated.
Further, the air inlet direction of the air inlet, the shooting direction of the CCD camera and the emitting direction of the laser are all perpendicular to each other.
Further, the glass cylinder and the glass end cap 4 are made of glass materials which have good light transmittance and are used for optical measurement.
Further, a lens group is arranged between the laser and the rotor engine test piece, and the laser generates laser light which is converted into a sheet light source through the lens group.
Compared with the prior art, the invention has the following advantages:
(1) based on the principle of an air passage steady flow test, the invention generates stable pressure difference through a fan, obtains theoretical flow through Bernoulli equation by measuring the pressure and temperature at two ends of an air inlet of a rotor engine (the pressure and the temperature in the atmospheric environment and the pressure of a pressure stabilizing box), obtains actual gas flow through a gas flowmeter in front of the fan, and further can accurately calculate the flow coefficient of the air inlet for evaluating the flow capacity of the air inlet of the rotor engine and guiding the design of the air inlet;
(2) based on the principle of an air passage steady flow test, a fan generates stable pressure difference, a vane anemograph positioned in a simulation cylinder sleeve collects a vortex rotor, the capacity of generating vortex at an air inlet of a rotor engine is further calculated, and the optimization of the combustion process is facilitated;
(3) the invention can obtain the flowing microcosmic characteristic of the rotor engine cylinder by the optical test method of the CCD camera, and can be used for calibrating a simulation calculation model and guiding the design of a combustion chamber of a rotor and a cylinder sleeve.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of a rotary engine test piece;
fig. 3 is a schematic structural view of the end cap.
Description of reference numerals:
1-rotary engine test piece; 2-a glass cylinder body; 3-a rotor of the engine; 4-glass end caps; 5-a CCD camera; 6-lens group; 7-a laser; 8-harness; 9-a synchronizer; 10-a controller; 11-surge tank pressure sensor; 12-a surge tank; 13-a gas flow meter; 14-a fan; 15-a pipeline; 16-an air inlet; 17-blade anemometer; 18-simulated cylinder liners; 19-sealing the end cap; 20-an exhaust port; 21-atmospheric pressure sensor; 22-atmospheric temperature sensor; 23-plug; 24-hollow cavity.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present 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 present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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 present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1-3, a steady flow test device for an air passage of a rotor engine comprises a rotor engine test piece 1, a wiring harness 8, a synchronizer 9, a controller 10, a pressure stabilizing box pressure sensor 11, a pressure stabilizing box 12, a gas flowmeter 13, a fan 14, a pipeline 15, a blade anemometer 17, a simulation cylinder sleeve 18, an atmospheric pressure sensor 21 and an atmospheric temperature sensor 22;
the upper end of the simulation cylinder sleeve 18 is provided with the rotor engine test piece 1, the lower end of the simulation cylinder sleeve 18 is communicated with the pressure stabilizing box 12, and the vane anemograph 17 is arranged in the simulation cylinder sleeve 18 and arranged right below the rotor engine test piece 1, and can be used for measuring the movement strength of airflow generated by the air inlet 15 of the rotor engine test piece 1 and evaluating the capability of the air inlet 15 for generating vortex.
The CCD camera 5 is arranged above an air inlet 16 of the rotor engine test piece 1, the laser 7 is arranged on the side portion of the air inlet 16 of the rotor engine test piece 1, the CCD camera 5 and the laser 7 are connected with the synchronizer 9 through a wiring harness 8, the fan 14 is connected with the pressure stabilizing box 12 through a pipeline 15, certain negative pressure is generated in the pressure stabilizing box 12, and the gas flowmeter 13 installed on the pipeline 15 measures actual gas flow.
Pressure stabilizing box pressure sensor 11, atmospheric pressure sensor 21 and atmospheric temperature sensor 22 are all installed on pressure stabilizing box 12, and pressure stabilizing box pressure sensor 11, atmospheric pressure sensor 21, atmospheric temperature sensor 22, gas flowmeter 13 and synchronizer 9 all connect in controller 10 through pencil 8, and controller 10 gathers signals and sends out the instruction. The pressure stabilizing box pressure sensor 11 measures the pressure in the pressure stabilizing box 12, the atmospheric pressure sensor 21 and the atmospheric temperature sensor 22 measure the ambient pressure and the ambient temperature, the theoretical gas flow is calculated through a formula, the measured actual gas flow is divided by the calculated theoretical gas flow, and the flow coefficient of the air inlet 15 of the rotor engine test piece 1 is obtained and used for evaluating the flow capacity of the air inlet 15.
The rotary engine test piece 1 comprises a glass cylinder body 2, an engine rotor 3, a glass end cover 4 and a sealing end cover 19, the engine rotor 3 is installed in the glass cylinder body 2, the glass end cover 4 is detachably fixed at the upper end of the glass cylinder body 2, the sealing end cover 19 is fixed at the lower end of the glass cylinder body 2, a hollow cavity 24 is formed in the sealing end cover 19 and communicated with a simulation cylinder sleeve 18 and sealed by the top surface of the simulation cylinder sleeve 18, an air inlet 16 and an air outlet 20 are formed in the glass cylinder body 2, the air outlet 20 is sealed by a plug 23, the air inlet 16 is communicated with the atmosphere, and tracer particles can be added.
The air inlet direction of the air inlet 16, the shooting direction of the CCD camera 5 and the emitting direction of the laser 7 are all perpendicular to each other.
The glass cylinder body 2 and the glass end cover 4 are made of glass materials which have good light transmittance and are used for optical measurement.
A lens group 6 is arranged between the laser 7 and the rotor engine test piece 1, the laser 7 generates laser and then is converted into a sheet light source through the lens group 6, the sheet light source penetrates through the glass cylinder body 2 to enter the interior of the rotor engine test piece 1, and then the CCD camera 5 arranged on one side of an air inlet 16 of the rotor engine test piece 1 and above the glass end cover 4 measures the flow field in the rotor engine test piece 1 and is used for evaluating the capacity of the air inlet 15 for generating in-cylinder flow.
The laser 7 is connected with the synchronizer 9 through the wiring harness 8, the laser 7 emits laser and generates a trigger signal in the test, the signal is transmitted to the synchronizer 9 through the wiring harness 8, and then the synchronizer 9 transmits the signal to the CCD camera 5 through the wiring harness 8 to shoot, so that the displacement condition of particles in the cylinder is measured, and the change of a flow field in the cylinder is analyzed.
When the test piece is used, the exhaust port 20 of the rotor engine test piece 1 is sealed by the plug 23, the air inlet 16 is normally open, the rotor engine test piece 1 is connected with the pressure stabilizing box 12 through the simulation cylinder sleeve 18, and under the suction action of the fan 14, air flows through the air inlet 16, the glass cylinder body 2, the sealing end cover 19, the simulation cylinder sleeve 18, the pressure stabilizing box 12, the pipeline 15 and the gas flowmeter 13 and is finally exhausted into the atmosphere through the fan 14.
Under the suction action of the fan 14, a certain negative pressure is generated in the surge tank 12, and the pressure p in the surge tank is measured by the surge tank pressure sensor 11. The atmospheric pressure sensor 21 and the atmospheric temperature sensor 22 measure the ambient pressure and the ambient temperature, and the theoretical gas flow is calculated by the following formula:
ρ＝(p0-Δp1)/R(273+t)
ρ0＝p0/R(273+t0)
ρm＝(ρ+ρ0)/2
in the above-mentioned formula, the compound of formula,
ρ、ρ0、ρmaverage density (kg/m) between inlet outlet, inlet and outlet, respectively3)；
ρ0、t0-atmospheric pressure (Pa) and atmospheric temperature (deg.c) at the time of the test measurement;
Δp1t is the measured pressure drop (Pa) of the air port and the temperature (DEG C) of the air at the air port outlet during the test;
r — gas constant of air, R287.1J/kg · K;
d. f' -diameter of throat of air intake (mm) and area of throat (m)2)。
The atmospheric pressure sensor 21 and the atmospheric temperature sensor 22 measure the ambient pressure p0And the ambient temperature t0The outlet pressure drop can be calculated:
Δp1＝p0-p
because the pressure drop of the air inlet is small, the temperature t at the outlet of the visible air port is approximately equal to t0。
The gas flowmeter 13 is arranged on a pipeline 15 and can measure the actual gas flow
The flow coefficient μ of the inlet can be calculated according to the following formula:
the vane anemometer 17 is arranged in the simulation cylinder sleeve 18 and can measure the movement intensity of the airflow generated by the air inlet 15 of the rotor engine test piece 1 to obtain the rotating speed n of the vanesD. The parameter for evaluating the ability of the intake port 15 to generate a swirl is a swirl ratio Ω, which is calculated by the following equation:
Ω＝nD/n
in the above formula, n is the engine speed (r/min).
The laser 7 sends laser and generates a trigger signal in the test through the wiring harness 8 and the synchronizer 9, the signal is transmitted to the synchronizer 9 through the wiring harness 8, and then the synchronizer 9 transmits the signal to the CCD camera 5 through the wiring harness 8 to shoot so as to measure the displacement condition of particles in the cylinder and further analyze the change of a flow field in the cylinder.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (5)
1. The utility model provides a rotor engine air flue stationary flow test device which characterized in that: the testing device comprises a rotor engine test piece (1), a wiring harness (8), a synchronizer (9), a controller (10), a pressure stabilizing box pressure sensor (11), a pressure stabilizing box (12), a gas flowmeter (13), a fan (14), a pipeline (15), a blade anemometer (17), a simulation cylinder sleeve (18), an atmospheric pressure sensor (21) and an atmospheric temperature sensor (22);
the upper end of the simulation cylinder sleeve (18) is provided with a rotary engine test piece (1), the lower end of the simulation cylinder sleeve (18) is communicated with a pressure stabilizing box (12), the vane anemograph (17) is arranged in the simulation cylinder sleeve (18) and arranged right below the rotary engine test piece (1), and an engine rotor (3) in the rotary engine test piece (1) is communicated with the inside of the simulation cylinder sleeve (18);
a CCD camera (5) is arranged above an air inlet (16) of the rotor engine test piece (1), a laser (7) is arranged on the side of the air inlet (16) of the rotor engine test piece (1), the CCD camera (5) and the laser (7) are connected with a synchronizer (9) through a wiring harness (8), a fan (14) is connected with a pressure stabilizing box (12) through a pipeline (15), and a gas flowmeter (13) is arranged on the pipeline (15);
pressure stabilizing box pressure sensor (11), atmospheric pressure sensor (21) and atmospheric temperature sensor (22) all install on pressure stabilizing box (12), and pressure stabilizing box pressure sensor (11), atmospheric pressure sensor (21), atmospheric temperature sensor (22), gas flowmeter (13) and synchronous ware (9) all connect in controller (10) through pencil (8).
2. The rotary engine air flue flow stabilization test device of claim 1, wherein: the rotary engine test piece (1) comprises a glass cylinder body (2), an engine rotor (3), a glass end cover (4) and a sealing end cover (19), the engine rotor (3) is installed in the glass cylinder body (2), the glass end cover (4) can be detachably fixed to the upper end of the glass cylinder body (2), the sealing end cover (19) is fixed to the lower end of the glass cylinder body (2), a hollow cavity (24) is formed in the sealing end cover (19) and communicated with a simulation cylinder sleeve (18), the top surface of the simulation cylinder sleeve (18) is sealed, an air inlet (16) and an air outlet (20) are formed in the glass cylinder body (2), the air outlet (20) is sealed by a plug (23), and the air inlet (16) is communicated with the atmosphere.
3. The rotary engine air flue flow stabilization test device of claim 2, wherein: the air inlet direction of the air inlet (16), the shooting direction of the CCD camera (5) and the emitting direction of the laser (7) are all perpendicular to each other.
4. The rotary engine air flue flow stabilization test device of claim 2, wherein: the glass cylinder body (2) and the glass end cover (4) are made of glass materials which have good light transmission and are used for optical measurement.
5. The rotary engine air passage flow stabilization test device according to any one of claims 1 to 4, characterized in that: a lens group (6) is arranged between the laser (7) and the rotor engine test piece (1), and the laser (7) generates laser and then is converted into a sheet light source through the lens group (6).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011521411.7A CN112781884A (en) | 2020-12-21 | 2020-12-21 | Rotor engine air flue flow stabilization test device |
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| CN202011521411.7A CN112781884A (en) | 2020-12-21 | 2020-12-21 | Rotor engine air flue flow stabilization test device |
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Application publication date: 20210511 |