CN1410748A - Internal combustion engine gas path flow performance permanent flow test variable pressure difference test method - Google Patents
Internal combustion engine gas path flow performance permanent flow test variable pressure difference test method Download PDFInfo
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- CN1410748A CN1410748A CN 02128945 CN02128945A CN1410748A CN 1410748 A CN1410748 A CN 1410748A CN 02128945 CN02128945 CN 02128945 CN 02128945 A CN02128945 A CN 02128945A CN 1410748 A CN1410748 A CN 1410748A
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Abstract
The purpose of the invention is to increase the trial speed, for example to realize fast and accurate testing the cylinder cover on the process line. Usually, if Reynolds number is controlled by the blower fan above 60X10 to the power 3, the adjustment and control of the pressure difference can be omitted. Thus, the detecting efficiency is greatly increased and the labor intensity is greatly reduced. Experiments show that in the case of using the blade type anemometer, the detecting efficiency is increased about 5 times. If the eddy current momentum meter is used, then the detecting efficiency is increased about 10 times.
Description
Technical field
The invention belongs to machine-building, particularly a kind of internal combustion engine gas path flow performance permanent flow test variable pressure difference test method.
Background technology
With the stable-state flow test method(s) detect, coefficient of flow, the swirl ratio in the inlet and outlet road of test internal combustion engine, to roll flow characteristics parameters such as stream compares be extensively to adopt both at home and abroad and efficient ways.Dynamic property, economy and the emission behavior that guarantees internal combustion engine played crucial effects.But what at present tradition adopted when carrying out the current stabilization test is level pressure difference test method(s), promptly under carrying out the different air valve lift during current stabilization test, needs constantly to adjust the pressure before and after the air flue, make this air flue before and after pressure difference value be maintained certain value.So be level pressure difference test method(s).In level pressure difference process of the test, need to regulate the preceding valve of blower fan, so that the pressure difference that keeps the airway pressure gap sensor to record is a constant.Because air flue test need change a lift more than 10 times each time, above-mentioned adjustment process just need be carried out more than 10 times, and this has just influenced the raising of detection speed greatly.
Figure 1 shows that the steady flow testbed synoptic diagram of air passage of internal combustion engine.1 is detected combustion engine cylinder head among the figure, and it is placed on the platen 10 of steady flow testbed of air passage.Valve stroke sensor 2 detects the valve stroke of cylinder head.This testing table is air-breathing working method, and air-flow enters cylinder along the direction of arrow from air flue, discharges through blower fan 6 backs through air flowmeter 8 and variable valve 7 again.
Vacuum tightness when air-breathing in the cylinder, promptly air flue pressure reduction is delivered to data acquisition unit 4 after being detected by airway pressure gap sensor 3, and data acquisition unit 4 is also gathered valve stroke signal 2 simultaneously, anemoscope tach signal 9 and air flow rate signal 8 etc.Adopt data all be admitted to computing machine 5 and handle and export end product at once.
At traditional deciding in the pressure differential method test, must constantly adjust variable valve 7 when valve stroke changes is constant so that keep sensor 3 detected airway pressure differences.As the 254mm water column.
In level pressure difference test method(s),, often need the long time or use than hi-tech because its difference is a constant when need adjusting pressure before and after the air flue.Influenced the raising of detection speed greatly.
Summary of the invention
Improve test speed, realize that the detection problem quick and precisely on production line is made combustion engine cylinder head flowing property checkout equipment by test parts such as combustion engine cylinder head, do to guarantee to be purpose of the present invention for the performance quality that improves internal combustion engine.
When normally moving according to internal combustion engine in its air flue gas be full-blown turbulent flow, its dimensionless coefficient of flow and swirl ratio, to roll stream be constant characteristic than all.Pilot-gas flows through the mobile Reynolds number 60 * 10 of process that air flue-air valve enters cylinder
3More than, promptly pilot-gas flows through the mobile Reynolds number 60 * 10 of air flue
3More than, just can remove adjusting and control to its pressure differential.Generally can adopt blower fan control.Like this, when the current stabilization test of carrying out air flue, just can use manually or automatic technology when opening valve continuously or intermittently, detect corresponding to the flow under the different air valve lift, air flue pressure reduction, eddy current/roll circulation speed or angular momentum flux etc., thus coefficient of flow, swirl ratio/the roll parameters such as stream compares of gas off-take.
Remove adjusting and control from, detection efficiency is improved greatly, and the detection working strength of workers is reduced greatly pressure differential.Test shows, under the situation of using the blade anemoscope, can improve about 5 times of detection efficiency.If with eddy current momentum meter, efficient then can improve more than 10 times.Can satisfy on production line the quick, accurate of air passage of internal combustion engine performance detected.
Description of drawings Fig. 1: the steady flow testbed sketch of internal combustion engine inlet; Fig. 2: synoptic diagram is adjusted in the valve stroke robotization; Fig. 3: eddy current momentum instrumentation amount is rolled the intensity of flow synoptic diagram.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing:
Fig. 2 is valve stroke robotization adjusting gear signal in the air flue test.11 is the jackscrew that is driven by the worm-and-wheel gear of step motor control among the figure.Jackscrew descending will progressively be opened the valve of detected cylinder head 1, detects the height of valve strokes with valve stroke sensor 2.Air flue pressure reduction is detected by airway pressure gap sensor 3.
Figure 3 shows that the example that adopts eddy current momentum instrumentation amount to roll intensity of flow.Tested cylinder head 1 be contained on the platen 2 after cylinder jacket 12 is connected, air, is discharged from blower fan 6 behind eddy current momentum meter 13 and the tube of pressure-stabilizing 14 through cylinder jacket 12 at last from cylinder head 1.The intensity of flow that rolls that is produced is detected by eddy current momentum meter 13.
In above-mentioned two embodiment, cancelled the control of variable valve 7.All adopt blower fan 6 control Reynolds numbers, generally select air flue pressure reduction more than 2.95KPa (300mm water column), preferably select the blower fan of blast more than 5.9KPa (600mm water column) for diesel engine; Subjects is little cylinder diameter (using as a motorcycle) gasoline engine, and control air flue pressure reduction is preferably selected the blower fan of blast more than 9.8KPa (1000mm water column) more than 7.8KPa (800mm water column).To guarantee that Reynolds number is 60 * 10
3More than.
After adopting the art of this patent, only need continuously or disconnected need open valve in, detect corresponding to the flow under the different air valve lift, air flue pressure reduction, eddy current/roll circulation speed or angular momentum flux etc., thus coefficient of flow, swirl ratio/the roll parameters such as stream compares of gas off-take.Need not for the pressure difference that keeps the airway pressure gap sensor to record be valve before constant and constantly going is regulated blower fan.Owing to removed adjusting and control from, detection efficiency is improved greatly, and the detection working strength of workers is reduced greatly pressure differential.
Claims (6)
1. an internal combustion engine gas path flow performance permanent flow test variable pressure difference test method is characterized in that pilot-gas flows through the mobile Reynolds number 60 * 10 of air flue
3More than, remove adjusting and control to pressure differential.
2. a kind of internal combustion engine gas path flow performance permanent flow test variable pressure difference test method as claimed in claim 1 is characterized in that adopting blower fan (6) control Reynolds number.
3. a kind of internal combustion engine gas path flow performance permanent flow test variable pressure difference test method as claimed in claim 2, it is characterized in that described subjects is a diesel engine, control air flue pressure reduction is preferably selected the blower fan of blast more than 5.9KPa (600mm water column) more than 2.95KPa (300mm water column).
4. a kind of internal combustion engine gas path flow performance permanent flow test variable pressure difference test method as claimed in claim 2, it is characterized in that described subjects is little cylinder diameter (using as a motorcycle) gasoline engine, control air flue pressure reduction is preferably selected the blower fan of blast more than 9.8KPa (1000mm water column) more than 7.8KPa (800mm water column).
5. a kind of internal combustion engine gas path flow performance permanent flow test variable pressure difference test method as claimed in claim 1 is characterized in that can taking manually or automatic technology in combustion machine gas path flow performance permanent flow test.
6. a kind of internal combustion engine gas path flow performance permanent flow test variable pressure difference test method as claimed in claim 1 is characterized in that satisfying on production line the quick, accurate of air passage of internal combustion engine performance is detected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02128945 CN1410748A (en) | 2002-08-23 | 2002-08-23 | Internal combustion engine gas path flow performance permanent flow test variable pressure difference test method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02128945 CN1410748A (en) | 2002-08-23 | 2002-08-23 | Internal combustion engine gas path flow performance permanent flow test variable pressure difference test method |
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| CN1410748A true CN1410748A (en) | 2003-04-16 |
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| CN 02128945 Pending CN1410748A (en) | 2002-08-23 | 2002-08-23 | Internal combustion engine gas path flow performance permanent flow test variable pressure difference test method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100595549C (en) * | 2007-12-21 | 2010-03-24 | 天津大学 | Device for measuring internal combustion engine in-cylinder tumble flow or vortex |
| WO2013049985A1 (en) * | 2011-10-08 | 2013-04-11 | Lu Ming | Stabilized current test platform for measuring performance of engine air inlet system |
| CN103217294A (en) * | 2013-03-20 | 2013-07-24 | 天津大学 | Zero point judgment and control mechanism for valve stroke of internal combustion engine air flue current stabilization test bed |
| CN103454091A (en) * | 2013-09-12 | 2013-12-18 | 中国船舶重工集团公司第七一一研究所 | Testing device of flowing property characteristics of internal combustion engine tee air inlet-exhaust pipe |
| CN105388018A (en) * | 2015-12-25 | 2016-03-09 | 中北大学 | Total pressure difference airway tumble test apparatus for engine |
| CN105910829A (en) * | 2016-04-15 | 2016-08-31 | 天津大学 | Flow stabilization testing method for air passage of large-cylinder-diameter internal combustion engine |
| CN109238719A (en) * | 2018-10-08 | 2019-01-18 | 广州锦红源电子科技有限公司 | Inlet characteristic test method and test macro applied to engine |
| CN110398611A (en) * | 2019-07-01 | 2019-11-01 | 天津大学 | Low speed two cycle marine diesel engine cylinder steady-flow test device and method |
-
2002
- 2002-08-23 CN CN 02128945 patent/CN1410748A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100595549C (en) * | 2007-12-21 | 2010-03-24 | 天津大学 | Device for measuring internal combustion engine in-cylinder tumble flow or vortex |
| WO2013049985A1 (en) * | 2011-10-08 | 2013-04-11 | Lu Ming | Stabilized current test platform for measuring performance of engine air inlet system |
| CN103217294A (en) * | 2013-03-20 | 2013-07-24 | 天津大学 | Zero point judgment and control mechanism for valve stroke of internal combustion engine air flue current stabilization test bed |
| CN103217294B (en) * | 2013-03-20 | 2015-06-03 | 天津大学 | Zero point judgment and control mechanism for valve stroke of internal combustion engine air flue current stabilization test bed |
| CN103454091A (en) * | 2013-09-12 | 2013-12-18 | 中国船舶重工集团公司第七一一研究所 | Testing device of flowing property characteristics of internal combustion engine tee air inlet-exhaust pipe |
| CN103454091B (en) * | 2013-09-12 | 2016-02-10 | 中国船舶重工集团公司第七一一研究所 | The flowing property token test device of internal combustion engine tee air inlet-outlet pipe |
| CN105388018A (en) * | 2015-12-25 | 2016-03-09 | 中北大学 | Total pressure difference airway tumble test apparatus for engine |
| CN105910829A (en) * | 2016-04-15 | 2016-08-31 | 天津大学 | Flow stabilization testing method for air passage of large-cylinder-diameter internal combustion engine |
| CN105910829B (en) * | 2016-04-15 | 2018-04-24 | 天津大学 | The Robust PCA method of large-diameter air passage of internal combustion engine |
| CN109238719A (en) * | 2018-10-08 | 2019-01-18 | 广州锦红源电子科技有限公司 | Inlet characteristic test method and test macro applied to engine |
| CN110398611A (en) * | 2019-07-01 | 2019-11-01 | 天津大学 | Low speed two cycle marine diesel engine cylinder steady-flow test device and method |
| CN110398611B (en) * | 2019-07-01 | 2021-04-20 | 天津大学 | Device and method for testing steady-state flow of cylinder of low-speed two-stroke marine diesel engine |
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