CN106940255A - The method and apparatus for measuring transverse axis eddy motion in Motor Engine Cylinder - Google Patents
The method and apparatus for measuring transverse axis eddy motion in Motor Engine Cylinder Download PDFInfo
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- CN106940255A CN106940255A CN201610002457.5A CN201610002457A CN106940255A CN 106940255 A CN106940255 A CN 106940255A CN 201610002457 A CN201610002457 A CN 201610002457A CN 106940255 A CN106940255 A CN 106940255A
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- cylinder
- transverse axis
- blast pipe
- pressurizer
- eddy motion
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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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- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
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Abstract
The invention discloses a kind of method and apparatus for measuring transverse axis eddy motion in Motor Engine Cylinder, the device includes simulation cylinder (6), tumble flow blast pipe (3), paddle wheel anemometer (2), revolution counter (4), pressure gauge (7), flowmeter (8), exhaust duct (11), two grades of pressurizer tanks (1), pressurizer tank (10), an air blower (9).The device can measure the macroscopical large scale tumble motion intensity and intake efficiency of the generation of engine tumble flow gas handling system simultaneously.
Description
Technical field
Field is manufactured the present invention relates to engine, it is specifically a kind of to measure transverse axis eddy motion in Motor Engine Cylinder
Method and apparatus.The function of the device is that the transverse axis that measurement engine aspirating system is formed in Motor Engine Cylinder is vortexed
Rotational flow capacity and intake efficiency.
Background technology
There is a kind of basic rotary motion pattern in engine cylinder, transverse axis vortex (tumble), its motor pattern shows
It is intended to as shown in Figure 1.This air motion pattern has a major impact to the combustion process of engine.Transverse axis vortex refers to rotation
Air-flow surrounds the motion of the axis perpendicular with cylinder axis.Transverse axis vortex is formed in the intake process later stage, in compression process with
Piston rising, cylinder space diminishes, until broken, turbulent flow of the formation based on large scale whirlpool occurs for transverse axis eddy motion
, further speed up flame propagation velocity.The rotational flow capacity transverse axis swirl ratio r tables of transverse axis vortex in engine cylinder
Show,
ω in formulasIt is the rotary rpm of transverse axis eddy motion in engine cylinder；ωeIt is engine output shaft rotating speed.
Transverse axis eddy motion is produced by the gas handling system of automobile engine in Motor Engine Cylinder.Automobile engine
Gas handling system mainly include:Air intake duct, combustion chamber, inlet valve, and control the parts such as the mechanism of inlet valve motion.Engine
The ability that the performance of gas handling system refers to the intake efficiency of gas handling system and makes the air-flow entered in cylinder produce rotary motion.Enter
Gas efficiency refers to by gas handling system that into the ratio between gas volume and cylinder displacement of cylinder it weighs the circulation energy of gas handling system
Power.Because airflow passes air intake duct, inlet valve, combustion chamber in intake process, flow resistance, influence air inlet effect will necessarily be run into
Rate.Intake efficiency is the principal element for determining engine charging efficiency.The charging efficiency reduction of automobile engine means to start
The power output of machine declines.Gas handling system can carry out tissue to intake process, the air-flow production caused entry into engine cylinder
The rotary motion of raw certain pattern, is conducive to improving burning velocity and heat liberation rate, heat release rate, causing improves the combustion process of engine.Air inlet
System produces what air inlet rotation was mainly completed by the design of the geometry of air intake duct, combustion chamber and inlet valve.
Car engine air admittance process is transient state (changing over time), and above-mentioned parameter (transverse axis swirl ratio, air inlet effect
Rate) measurement be only possible to what is carried out under steady flow condition.Will be gradually solid according to different inlet valve lift locations during measurement
Determine inlet valve, the quasi-steady flow regime of a car engine air admittance process is formed, under each IO Intake Valve Opens position
The measurement of transverse axis rotational speed of eddy current and charge flow rate is carried out, then the measurement result obtained under the conditions of quasi-steady is integrated computing,
Finally obtain the rotational flow capacity and intake efficiency index of the gas handling system.Such experimental rig is referred to as measuring automobile engine
The device of transverse axis eddy motion in cylinder, can be used for new product development, product line detection, industrially applicable.
The content of the invention
It is an object of the invention to provide a kind of method and apparatus for measuring transverse axis eddy motion in Motor Engine Cylinder, figure
2 be the layout of the device proposed by the present invention.Including a simulation cylinder (6), transverse axis vortex blast pipe (3), one
Paddle wheel anemometer (2), revolution counter (4), pressure gauge (7), flowmeter (8), exhaust duct (11), one two
Level pressurizer tank (1), pressurizer tank (10), an air blower (9), the annexation of all parts is：
Simulate cylinder (6) and connect transverse axis vortex blast pipe (3) of the inside equipped with a paddle wheel anemometer (2)；
Transverse axis vortex blast pipe (3) is connected to two grades of pressurizer tanks (1) by connecting pipe (20)；
Two grades of pressurizer tanks (1) are connected to exhaust duct (11)；
Pressure gauge (7) and flowmeter (8) are installed on the wall of exhaust duct (11), then are connected to another pressurizer tank (10).
As shown in Figure 2, in order to measure the transverse axis eddy motion of Motor Engine Cylinder large scale, it is necessary to a blade
Formula anemobiagraph (2) is placed in the transverse axis of traverse vortex blast pipe (3), the air-flow rotating speed in measurement transverse axis eddy motion direction (5).
And in actual moving process, in engine cylinder, the position of transverse axis vortex, power are all being continually changing, so, turn of anemobiagraph (2)
Speed only reflects the moving situation that transverse axis is vortexed in cylinder on location.Measurement result is only used as itself relatively.
During measurement, under each valve stroke, air blower (9) air draught is allowed, cause pressure gauge by adjusting air blower (9)
(9) pressure difference △ P in are certain value, read the flow in flowmeter (8), and with the paddle wheel anemometer (2) in revolution counter (4)
Rotating speed, you can obtain swirl ratio or transverse axis swirl ratioAnd intake efficiency
The use principle of the measurement apparatus：
Transverse axis swirl ratio can be defined as in the measurement apparatus
N in formulas(θ) is the rotating speed of a certain valve stroke lower blade anemobiagraph, dimension for rev/min；Qs(θ) is a certain gas
Volumetric flow of gas under door lift, dimension is rice3/ the second；θ is engine crankshaft corner, valve stroke can be converted into herein high
Degree；VhIt is engine cylinder displacement.The charging efficiency of gas handling system is
V in above formula0It is theoretical intake velocity,Dimension is meter per second；Δ p is the pressure difference in flowmeter；A
It is inlet valve valve seating area.The performance indications of transverse axis vortex intake system need to accumulate transverse axis swirl ratio, charging efficiency
Point, the average transverse axis swirl ratio of intake process, and mean air entry efficiency are obtained, the index for weighing gas handling system performance is used as.
Average transverse axis swirl ratio is defined as
In view of compression ratio ε and charging efficiency η influence, it is by the average transverse axis swirl ratio of amendment
Uniform charge efficiency is
The device can measure transverse axis eddy motion in engine cylinder, and the air inlet of transverse axis vortex intake system is imitated
Rate.The apparatus structure is simple, easy to operate, it is easy to safeguard, novel air inlet path, inlet valve, combustion chamber available for engine
Development process, it can also be used to the performance of gas handling system is detected in engine manufacturing process.
Brief description of the drawings
Fig. 1 is transverse axis eddy motion pattern diagram in engine cylinder.In figure, 5 transverse axis eddy motion directions, 12 are lived
Plug, 13 cylinders, 14 exhaust valves, 15 inlet valves, 16 air intake ducts.
Fig. 2 is the layout for the device for measuring automobile engine transverse axis eddy motion.In figure, 1 two grades of pressurizer tanks, 2 blades
Anemobiagraph, 3 transverse axis vortex blast pipe, 4 revolution counters, 5 transverse axis eddy motion directions, 6 simulation cylinders, 7 pressure gauges, 8 flowmeters, 9
Air blower, 10 pressurizer tanks, 11 exhaust ducts, 20 connecting pipes.
Fig. 3 is the specific embodiment layout for measuring the device of transverse axis eddy motion in Motor Engine Cylinder.In figure,
1 two grades of pressurizer tanks, 2 paddle wheel anemometers, 3 transverse axis vortex blast pipe, 4 revolution counters, 6 simulation cylinders, 7 pressure gauges, 8 flowmeters, 9 drums
Blower fan, 10 pressurizer tanks, 11 exhaust ducts, 15 inlet valves, 16 air intake ducts, 17 cylinder covers, 18 cylinder cover alignment systems, 19 quartz windows,
20 connecting pipes.
Embodiment
Further illustrate that transverse axis is vortexed in measurement Motor Engine Cylinder proposed by the present invention with a specific embodiment
The structure and principle of the method and apparatus of motion.Fig. 3 is the tool for measuring the device of transverse axis eddy motion in Motor Engine Cylinder
Body embodiment layout.As shown in FIG., cylinder cover is disposed to determine first on the simulation cylinder (6) in cylinder-shaped thin wall cavity
Position system (18), it is therefore an objective to be to align cylinder cover (17) with simulation cylinder (6).In order to which the transverse axis for measuring large scale in cylinder is vortexed
Motion, it is necessary to which a vane type anemobiagraph (2) is placed in transverse axis vortex blast pipe (3), measurement transverse axis vortex rotary motion side
Rotating speed on (5).Transverse axis vortex blast pipe (3) is cylinder-shaped thin wall pipeline, three points of a diameter of simulation cylinder (6) diameter
Two.It is vertical with simulation cylinder central axis that transverse axis is vortexed blast pipe (3) central axis, installed in simulating cylinder (6) along axis
The bottom in direction, it is therefore an objective to simulate the transverse axis eddy motion at air inlet end of a period moment.Paddle wheel anemometer in transverse axis vortex blast pipe
(2) it is driven to rotate by air-flow.There is small quartz window (19) on transverse axis vortex blast pipe (3).Photoelectric whirl on revolution counter (4)
Device aligns the photoelectric sensor on paddle wheel anemometer (2) by quartz window (19), with record paddle wheel anemometer with rotating speed.
Transverse axis vortex blast pipe (3) is connected to two grades of pressurizer tanks (1) by a connecting pipe (20), is one long
The cavity of cube shape, can weaken the pulsation of air inlet flowing.Two grades of pressurizer tank (1) connection exhaust ducts (11), its shape is round
Cut-in pressure meter (7) and flowmeter (8) on cylindrical thin wall pipeline, wall.Flowmeter (8) can be plate hole flowmeter or vortex street stream
Gauge.Exhaust duct (11) accesses pressurizer tank (10) again, is the cavity of a rectangular shape, and air blower (9) is accessed above.Voltage stabilizing
The effect of case (10) is to weaken the charge pulsation of air blower (9) so that experiment is run in steady flow.
During measurement, under each fixation valve stroke, inlet valve (15) position is fixed, air blower (9) air draught, gas is allowed
Stream enters simulation cylinder (6) by air intake duct (17).Valve stroke is adjusted to next fixed position, air blower is then adjusted
(9) air inflow, makes the pressure difference △ P in pressure gauge (7) remain certain value, reads flow and revolution counter in flowmeter (8)
(4) paddle wheel anemometer (2) rotating speed in, the swirl ratio of gas handling system can be obtained according to formula (5) above and (6)With
And intake efficiency
Claims (3)
1. a kind of method and apparatus for measuring transverse axis eddy motion in Motor Engine Cylinder, it is characterized in that, including a simulation
Cylinder (6), tumble flow blast pipe (3), paddle wheel anemometer (2), revolution counter (4), pressure gauge (7), one
Flowmeter (8), exhaust duct (11), two grades of pressurizer tanks (1), pressurizer tank (10), an air blower (9), each
The annexation of part is：
Simulate cylinder (6) and connect tumble flow blast pipe (3) of the inside equipped with a paddle wheel anemometer (2)；
Tumble flow blast pipe (3) is connected to two grades of pressurizer tanks (1) by connecting pipe (20)；
Two grades of pressurizer tanks (1) are connected to exhaust duct (11)；
Pressure gauge (7) and flowmeter (8) are installed on the wall of exhaust duct (11), then are connected to another pressurizer tank (10).
2. the method and apparatus of transverse axis eddy motion, its feature in the measurement Motor Engine Cylinder according to claim l
It is that described simulation cylinder (6) is the thin walled cavity in cylinder.
3. the method and apparatus of transverse axis eddy motion, its feature in the measurement Motor Engine Cylinder according to claim l
Be that described tumble flow blast pipe (3) is in the shape of cylinder-shaped thin wall pipeline, a diameter of simulation cylinder (6) diameter three/
Two, its center axis is vertical with the central axis of simulation cylinder (6), installed in the position of the side decentralization of simulation cylinder (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610002457.5A CN106940255A (en) | 2016-01-01 | 2016-01-01 | The method and apparatus for measuring transverse axis eddy motion in Motor Engine Cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610002457.5A CN106940255A (en) | 2016-01-01 | 2016-01-01 | The method and apparatus for measuring transverse axis eddy motion in Motor Engine Cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106940255A true CN106940255A (en) | 2017-07-11 |
Family
ID=59468929
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610002457.5A Pending CN106940255A (en) | 2016-01-01 | 2016-01-01 | The method and apparatus for measuring transverse axis eddy motion in Motor Engine Cylinder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106940255A (en) |
-
2016
- 2016-01-01 CN CN201610002457.5A patent/CN106940255A/en active Pending
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| PB01 | Publication | ||
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170711 |