CN102507078A - Precision measuring system and method for conveying pipe flow resistance - Google Patents
Precision measuring system and method for conveying pipe flow resistance Download PDFInfo
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- CN102507078A CN102507078A CN2011103593999A CN201110359399A CN102507078A CN 102507078 A CN102507078 A CN 102507078A CN 2011103593999 A CN2011103593999 A CN 2011103593999A CN 201110359399 A CN201110359399 A CN 201110359399A CN 102507078 A CN102507078 A CN 102507078A
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- delivery pipe
- flow resistance
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- conveying pipe
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Abstract
The invention belongs to rocket boost conveying system, and particularly relates to a precision measuring method for flow resistance of real propellant flowing through a conveying pipe, which aims to precisely measure actual flow resistance value of the conveying pipe under given propellant flow rate. The measuring system includes a propellant storage tank, wherein three branches are externally connected to the storage tank; the two branches are storage tank outflow branches; the propellant is sequentially connected with a test piece of the conveying pipe through a gear pump, a flow rate, a ball valve and a stainless steel corrugated pipe; the third branch is a propellant back flow path and includes a ball valve; a differential pressure gage is arranged between two conveying pipe inlets; a differential pressure gage is arranged between any conveying pipe inlet and conveying pipe outlet; and two ends of the differential pressure gages are connected with a measuring terminal through a needle valve. The two groups of differential pressure gages are used for measuring differential pressure, and the gear pump achieves flowrate variable frequency adjustment. The precision measuring system and method can precisely measure the actual flow resistance value of the conveying pipe, so as to check the design reasonableness of the conveying pipe.
Description
Technical field
The invention belongs to the rocket pressurizing transmission system, be specifically related to the accurate measurement method of a kind of true propellant flow through the flow resistance of delivery pipe.
Background technology
The oxygen of new rocket, combustion propellant respectively have two tanks, the difference symmetric arrangement, and this organization plan obviously is different from the active service model.According to traditional delivery pipe sampling method, the delivery pipe of symmetric double case is difficult to realize symmetric arrangement, and this causes two sections take-off pipe flow resistances of oxygen, combustion delivery pipe inconsistent.For realizing drag balance, this model has been used a kind of delivery pipe of scalable flow resistance.In order to check the design flow resistance of this delivery pipe, need in ground experiment, accurately measure delivery pipe actual flow resistance.
As required, require the flow resistance value of two sections take-off pipes of this delivery pipe must be highly approaching, the flow resistance difference of two take-off pipes be in ± 25pa.According to traditional flow resistance measuring technique, true propellant flow to be measured through the flow resistance of delivery pipe, measuring accuracy can't satisfy this model requirement.Therefore, need the flow resistance measuring method of a kind of true propellant flow newly of design through delivery pipe.
Summary of the invention
The object of the invention is accurately to measure the delivery pipe actual flow resistance under the given propellant flow rate, and a kind of delivery pipe flow resistance accurate measurement method is provided.
The technical scheme that the present invention adopted is:
A kind of delivery pipe flow resistance accurate measuring systems; The tank that comprises propellant; Be circumscribed with three branch roads at tank, wherein two branch roads are the tank branch road that effluents, and propellant connects the delivery pipe testpieces through gear-type pump, flowmeter, ball valve, corrugated stainless steel tubing successively; The 3rd branch road is propellant backflow road, comprises a ball valve; Between two delivery pipe inlets, arrange differential pressure gauge, between arbitrary delivery pipe inlet and delivery pipe outlet, arrange differential pressure gauge, the differential pressure gauge two ends are connected with measurement port through needle-valve.Two groups of differential pressure gauges are realized differential pressure measurement, and gear-type pump is realized the flow variable frequency adjustment.
Aforesaid a kind of delivery pipe flow resistance accurate measuring systems also comprises the hydraulic test platform, and the hydraulic test platform is regulated delivery pipe testpieces levelness through high-precision surveyor's staff, clearance gauge, makes two delivery pipe inlets be in same surface level; Surveyor's staff is used to measure the levelness of delivery pipe inlet, obtains two height difference between the delivery pipe inlet through the horizontal degree measurement value, and regulates with clearance gauge.
A kind of delivery pipe flow resistance accurate measurement method specifically comprises the steps:
(a) build delivery pipe flow resistance accurate measuring systems;
(b) adjusting gear pump frequency, the control pump slewing rate is until realizing the test determination flow;
(c) two high precision differential pressure gauges are measured the pressure differential deltap p between the two delivery pipes inlet respectively
1, and the pressure differential deltap p between inlet and the outlet
2Through the pressure difference that the high precision differential pressure gauge is measured, obtain between two inlets of delivery pipe testpieces, inlet is respectively Δ p with actual flow resistance between exporting
2, Δ p
2-Δ p
1
Aforesaid a kind of delivery pipe flow resistance accurate measurement method also comprises the step of regulating the difference in height between two inlets of delivery pipe testpieces in step (b) with (c).
The invention has the beneficial effects as follows:
1. measuring method provided by the invention is for using a kind of propellant pumping formula induction system; Survey the flow resistance value of the true delivery pipe under the given propellant flow rate; Can accurately measure delivery pipe actual flow resistance, check the delivery pipe design rationality, measuring accuracy satisfies the model requirement.
2. through height-adjustable test platform, guarantee that delivery pipe two inlets remain on equal height, avoid the influence of difference in height, guarantee the measurement data precision measurement data.
Description of drawings
Fig. 1 is a kind of delivery pipe flow resistance accurate measuring systems structural representation provided by the invention;
Among the figure: 1. tank; 2. gear-type pump; 3. flowmeter; 4. ball valve; 5. differential pressure gauge; 6. corrugated stainless steel tubing; 7. needle-valve, 8. delivery pipe testpieces, 9. delivery pipe inlet, 10. delivery pipe outlet.
Embodiment
Below in conjunction with accompanying drawing and embodiment a kind of delivery pipe flow resistance accurate measurement method provided by the invention is introduced:
As shown in Figure 1; A kind of delivery pipe flow resistance accurate measuring systems comprises the tank 1 of propellant being circumscribed with three branch roads at tank 1; Wherein two branch roads are tank 1 branch road that effluents; It is propellant backflow road that propellant connects 8, the three branch roads of delivery pipe testpieces through gear-type pump 2, flowmeter 3, ball valve 4, corrugated stainless steel tubing 6 successively, comprises a ball valve 4.Between two delivery pipe inlets 9, arrange differential pressure gauge 5, between arbitrary delivery pipe inlet 9 and delivery pipe outlet 10, arrange differential pressure gauge 5, differential pressure gauge 5 two ends are connected with measurement port through needle-valve 7.Two groups of differential pressure gauges 5 are realized differential pressure measurement, and gear-type pump 2 is realized the flow variable frequency adjustment.
In addition, in order to eliminate the influence of entrance height difference to measuring accuracy, increase the hydraulic test platform, the hydraulic test platform is regulated delivery pipe testpieces 8 levelnesss through high-precision surveyor's staff, clearance gauge, makes two delivery pipe inlets 9 be in same surface level.Surveyor's staff is used to measure the levelness of delivery pipe inlet 9, obtains two height difference between the delivery pipe inlet 9 through the horizontal degree measurement value, and regulates with clearance gauge.
A kind of delivery pipe flow resistance accurate measurement method specifically comprises the steps:
(1) builds delivery pipe flow resistance accurate measuring systems; Outside the tank 1 of propellant, connect three branch roads; Wherein two branch roads are tank 1 branch road that effluents; It is propellant backflow road that propellant connects 8, the three branch roads of delivery pipe testpieces through gear-type pump 2, flowmeter 3, ball valve 4, corrugated stainless steel tubing 6 successively, comprises a ball valve 4.Between two delivery pipe inlets 9, arrange differential pressure gauge 5, between arbitrary delivery pipe inlet 9 and delivery pipe outlet 10, arrange differential pressure gauge 5, differential pressure gauge 5 two ends are connected with measurement port through needle-valve 7.
(2) the delivery pipe testpieces is arranged on the test platform, at first regulates the levelness of test platform before the test, and the difference in height between two inlets of usage level chi experiment with measuring part is then through selecting suitable clearance gauge to eliminate difference in height.
(3) in the flow resistance measuring process, the propellant flow rate of the delivery pipe testpieces 8 that requires to flow through is a fixed value, and flow regulation adopts flowmeter 3, gear-type pump 2 modes of control each other.After setting gear-type pump 2 frequencies, open gear-type pump 2, according to the flow that flowmeter 3 shows, regulating tooth wheel pump 2 frequencies, the control pump slewing rate is until realizing the test determination flow.
(4) utilize two differential pressure gauges 5, measure the pressure differential deltap p between the two delivery pipes inlet 9
1, and delivery pipe inlet 9 exports the pressure differential deltap p between 10 with delivery pipe
2Through the pressure difference that differential pressure gauge 5 is measured, obtain between 8 two inlets of delivery pipe testpieces, inlet is respectively Δ p with actual flow resistance between exporting
2, Δ p
2-Δ p
1
Traditional delivery pipe flow resistance measuring method is the force value of a certain measuring point of working pressure sensor measurement, and the measuring accuracy of classic method can't satisfy the technical need of newly grinding model.This measuring system is used two high precision differential pressure gauges, measures the pressure reduction between delivery pipe two inlets respectively, and inlet with export between pressure reduction.Through the pressure difference that the high precision differential pressure gauge is measured, calculate the actual flow resistance and the flow resistance difference of two sections arms of delivery pipe respectively.The measuring accuracy of differential pressure gauge is 0.1%.
Claims (4)
1. delivery pipe flow resistance accurate measuring systems; The tank (1) that comprises propellant; Be circumscribed with three branch roads at tank (1); Wherein two branch roads are tank (1) branch road that effluents, and propellant connects delivery pipe testpieces (8) through gear-type pump (2), flowmeter (3), ball valve (4), corrugated stainless steel tubing (6) successively; The 3rd branch road is propellant backflow road, comprises a ball valve (4); Between two delivery pipe inlets (9), arrange differential pressure gauge (5), between arbitrary delivery pipe inlet (9) and delivery pipe outlet (10), arrange differential pressure gauge (5), differential pressure gauge (5) two ends are connected with measurement port through needle-valve (7).
2. a kind of delivery pipe flow resistance accurate measuring systems according to claim 1; It is characterized in that: said measuring system also comprises the hydraulic test platform; The hydraulic test platform is regulated delivery pipe testpieces (8) levelness through high-precision surveyor's staff, clearance gauge, makes two delivery pipe inlets (9) be in same surface level; Surveyor's staff is used to measure the levelness of delivery pipe inlet (9), obtains the height difference between two delivery pipe inlets (9) through the horizontal degree measurement value, and regulates with clearance gauge.
3. a delivery pipe flow resistance accurate measurement method specifically comprises the steps:
(a) build delivery pipe flow resistance accurate measuring systems;
(b) regulating tooth wheel pump (2) frequency, the control pump slewing rate is until realizing the test determination flow;
(c) two differential pressure gauges (5) are measured the pressure differential deltap p between the two delivery pipes inlets (9) respectively
1, and the pressure differential deltap p between a delivery pipe inlet (9) and the delivery pipe outlet (10)
2Through the pressure difference that differential pressure gauge (5) is measured, obtain between (8) two inlets of delivery pipe testpieces, inlet is respectively Δ p with actual flow resistance between exporting
2, Δ p
2-Δ p
1
4. a kind of delivery pipe flow resistance accurate measurement method according to claim 3 is characterized in that: also comprise the step of regulating the difference in height between (8) two inlets of delivery pipe testpieces in said step (b) with (c).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110359399.9A CN102507078B (en) | 2011-11-14 | 2011-11-14 | Precision measuring system and method for conveying pipe flow resistance |
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| CN201110359399.9A CN102507078B (en) | 2011-11-14 | 2011-11-14 | Precision measuring system and method for conveying pipe flow resistance |
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| CN102507078A true CN102507078A (en) | 2012-06-20 |
| CN102507078B CN102507078B (en) | 2014-06-18 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105547661A (en) * | 2014-10-31 | 2016-05-04 | 北京宇航系统工程研究所 | Conveying system flow resistance matching acceptance test apparatus and test method thereof |
| CN106323536A (en) * | 2016-10-13 | 2017-01-11 | 北京神雾环境能源科技集团股份有限公司 | Staged pressure difference measuring method for high pressure closed container |
| CN108132135A (en) * | 2016-12-01 | 2018-06-08 | 中国科学院大连化学物理研究所 | A kind of pipeline flow resistance measuring device and its measuring method |
| CN108132143A (en) * | 2016-12-01 | 2018-06-08 | 中国科学院大连化学物理研究所 | A kind of pipeline flow resistance measuring method |
| CN110608891A (en) * | 2019-09-04 | 2019-12-24 | 陕西蓝箭航天技术有限公司 | Cold flow test system of liquid rocket engine and parallel storage tank propellant conveying balance performance test method |
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| CN2268922Y (en) * | 1996-09-18 | 1997-11-26 | 常州市激光技术研究所 | Level ruler capable of transmitting red laser beam |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105547661A (en) * | 2014-10-31 | 2016-05-04 | 北京宇航系统工程研究所 | Conveying system flow resistance matching acceptance test apparatus and test method thereof |
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| CN106323536A (en) * | 2016-10-13 | 2017-01-11 | 北京神雾环境能源科技集团股份有限公司 | Staged pressure difference measuring method for high pressure closed container |
| CN108132135A (en) * | 2016-12-01 | 2018-06-08 | 中国科学院大连化学物理研究所 | A kind of pipeline flow resistance measuring device and its measuring method |
| CN108132143A (en) * | 2016-12-01 | 2018-06-08 | 中国科学院大连化学物理研究所 | A kind of pipeline flow resistance measuring method |
| CN110608891A (en) * | 2019-09-04 | 2019-12-24 | 陕西蓝箭航天技术有限公司 | Cold flow test system of liquid rocket engine and parallel storage tank propellant conveying balance performance test method |
| CN110608891B (en) * | 2019-09-04 | 2024-03-26 | 陕西蓝箭航天技术有限公司 | Cold flow test system of liquid rocket engine and parallel storage tank propellant conveying balance performance test method |
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| CN102507078B (en) | 2014-06-18 |
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