CN109737016A - A kind of mechanical efficiency measurement method of wind energy conversion system aerodynamic experiment device - Google Patents
A kind of mechanical efficiency measurement method of wind energy conversion system aerodynamic experiment device Download PDFInfo
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- CN109737016A CN109737016A CN201910090197.5A CN201910090197A CN109737016A CN 109737016 A CN109737016 A CN 109737016A CN 201910090197 A CN201910090197 A CN 201910090197A CN 109737016 A CN109737016 A CN 109737016A
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Abstract
A kind of mechanical efficiency measurement method of wind energy conversion system aerodynamic experiment device, step are as follows: wind mill wind wheel is first assembled with single bearing seat, the mean speed and standard deviation under each wind speed setting are sought by wind tunnel experiment；Wind mill wind wheel is assembled with Double bearing support again, the mean speed and standard deviation under each wind speed setting are sought by wind tunnel experiment；Under same settings wind speed, the mean speed difference under mono-/bis-bearing block is sought, then difference and the mean speed under single bearing seat are summed, obtains amendment mean speed；Using complete wind energy conversion system aerodynamic experiment device as experimental subjects, the mean speed and standard deviation under each wind speed setting are sought by wind tunnel experiment；Under same settings wind speed, the ratio of mean speed and amendment mean speed under wind energy conversion system aerodynamic experiment device is sought, which is the mechanical efficiency of wind energy conversion system aerodynamic experiment device；Finally seek the mechanical efficiency of revised wind energy conversion system aerodynamic experiment device.
Description
Technical field
The invention belongs to wind energy conversion system aerodynamic experiment technical fields, more particularly to a kind of wind energy conversion system aerodynamic experiment
The mechanical efficiency measurement method of device.
Background technique
Wind energy conversion system aerodynamic experiment needs carry out in wind-tunnel, while needing to use wind energy conversion system aerodynamic experiment dress
It sets, although the wind energy conversion system aerodynamic experiment device that each laboratory uses is essentially identical in structure composition, every set wind
The adjustment of power machine aerodynamic experiment device is different, when the wind wheel in face of same wind energy conversion system is tested, due to wind
Power machine aerodynamic experiment device is different, it will usually which leading to the experimental result surveyed out, there is also differences, although respectively covering wind energy conversion system
Measured deviation between aerodynamic experiment device is little, but still influences whether the reliability of experimental data.
Therefore, it is necessary to be measured to the mechanical efficiency of existing wind energy conversion system aerodynamic experiment device, so that every suit
The mechanical efficiency of wind energy conversion system aerodynamic experiment device can be corrected, to keep experimental data more true and reliable.
Summary of the invention
In view of the problems of the existing technology, the present invention provides a kind of mechanical efficiency of wind energy conversion system aerodynamic experiment device
Measurement method can be modified the mechanical efficiency of wind energy conversion system aerodynamic experiment device, so that experimental data is truer
Reliably.
To achieve the goals above, the present invention adopts the following technical scheme: a kind of wind energy conversion system aerodynamic experiment device
Mechanical efficiency measurement method, includes the following steps:
Step 1: installing experimental bench in wind-tunnel, and first bearing seat is installed on experimental bench, and wind mill wind wheel is passed through the
One transmission shaft is connected in first bearing seat, then the reflective strip at the first transmission shaft surface mount one；
Step 2: starting wind-tunnel utilizes non-contact laser revolution counter alignment reflective strip measurement first under wind speed setting
The revolving speed of transmission shaft, and then obtain the revolving speed of wind mill wind wheel；
Step 3: repeating step 2, and number of repetition is 7 times, and 7 revolving speed averageds that will acquire, then according to
FormulaSeek the standard deviation of revolving speed, in formula, S is the standard deviation of revolving speed,For mean speed；
Step 4: adjustment wind speed setting repeats step 2 and step 3, obtain mean speed under each wind speed setting and
The standard deviation of revolving speed；
Step 5: the first transmission shaft and wind mill wind wheel are removed from first bearing seat, then is installed on experimental bench
Two bearing bracket connects second driving shaft between first bearing seat and second bearing seat, and the wind mill wind wheel removed is installed to
On second driving shaft, the then reflective strip at second driving shaft surface mount one；
Step 6: starting wind-tunnel utilizes non-contact laser revolution counter alignment reflective strip measurement second under wind speed setting
The revolving speed of transmission shaft, and then obtain the revolving speed of wind mill wind wheel；
Step 7: repeating step 6, and number of repetition is 7 times, and 7 revolving speed averageds that will acquire, then according to
FormulaSeek the standard deviation of revolving speed, in formula, S is the standard deviation of revolving speed,For mean speed；
Step 8: adjustment wind speed setting repeats step 6 and step 7, obtain mean speed under each wind speed setting and
The standard deviation of revolving speed；
Step 9: under same settings wind speed, seeking the mean speed difference in step 4 and step 8, the difference to
Influence after reflection increase second bearing seat to revolving speed, then sums the difference and the mean speed in step 4, i.e.,
It can obtain eliminating the amendment mean speed that second bearing seat influences；Finally seek the flat of the standard deviation in step 4 and step 8
Mean value can be obtained and eliminate the amendment standard deviation that second bearing seat influences；
Step 10: electrical loading apparatus, first shaft coupling, torquemeter and second shaft coupling are sequentially connected in series to second and passed
On moving axis, to constitute complete wind energy conversion system aerodynamic experiment device；
Step 11: starting wind-tunnel, and electrical loading apparatus is in and is not loaded with state, under wind speed setting, utilization is non-contact
Formula laser revolution counter is directed at the revolving speed of reflective strip measurement second driving shaft, and then obtains the revolving speed of wind mill wind wheel；
Step 12: step 11 is repeated, number of repetition is 7 times, and the 7 revolving speed averageds that will acquire, then
According to formulaSeek the standard deviation of revolving speed, in formula, S is the standard deviation of revolving speed,It is average
Revolving speed；
Step 13: adjustment wind speed setting repeats step 11 and step 12, obtains being averaged under each wind speed setting
The standard deviation of revolving speed and revolving speed；
Step 14: under same settings wind speed, the mean speed ratio in step 13 and step 9, the ratio are sought
The as mechanical efficiency of wind energy conversion system aerodynamic experiment device；
Step 15: pass through formula η=c1+c2v+c3v2+c4v3+c5v4Seek revised wind energy conversion system aerodynamic experiment
The mechanical efficiency of device, in formula, η is mechanical efficiency, c1~c5For correction factor, v is wind speed.
Beneficial effects of the present invention:
The mechanical efficiency measurement method of wind energy conversion system aerodynamic experiment device of the invention, can be to wind energy conversion system aeroperformance
The mechanical efficiency of experimental provision is modified, so that experimental data is more true and reliable.
Detailed description of the invention
Fig. 1 is the assembling schematic diagram of wind mill wind wheel and single bearing block；
Fig. 2 is the assembling schematic diagram of wind mill wind wheel and Double bearing support；
Fig. 3 is the assembling schematic diagram of wind mill wind wheel and wind energy conversion system aerodynamic experiment device；
In figure, 1-experimental bench, 2-first bearing seats, 3-wind mill wind wheels, the 4-the first transmission shaft, 5-reflective strips,
6-second bearing seats, 7-second driving shafts, 8-electrical loading apparatus, 9-first shaft couplings, 10-torquemeters, the 11-the second connection
Axis device.
Specific embodiment
The present invention is described in further detail in the following with reference to the drawings and specific embodiments.
A kind of mechanical efficiency measurement method of wind energy conversion system aerodynamic experiment device, includes the following steps:
Step 1: as shown in Figure 1, installing experimental bench 1 in wind-tunnel, first bearing seat 2 is installed on experimental bench 1, by wind
Power machine wind wheel 3 is connected in first bearing seat 2 by the first transmission shaft 4, then the reflective strip at 4 surface mount one of the first transmission shaft
5；
Step 2: starting wind-tunnel utilizes non-contact laser revolution counter alignment reflective strip 5 measurement the under wind speed setting
The revolving speed of one transmission shaft 4, and then obtain the revolving speed of wind mill wind wheel 3；
Step 3: repeating step 2, and number of repetition is 7 times, and 7 revolving speed averageds that will acquire, then according to
FormulaSeek the standard deviation of revolving speed, in formula, S is the standard deviation of revolving speed,For mean speed；
Step 4: adjustment wind speed setting repeats step 2 and step 3, obtain mean speed under each wind speed setting and
The standard deviation of revolving speed, table specific as follows:
| Wind speed setting (m/s) | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 |
| Mean speed (r/min) | 613 | 852 | 1204 | 1433 | 1623 | 1820 | 2045 | 2301 | 2756 |
| Standard deviation | 5.4 | 6.1 | 5.8 | 6.2 | 5.6 | 6.8 | 8.1 | 8.6 | 8.8 |
Step 5: as shown in Fig. 2, the first transmission shaft 4 and wind mill wind wheel 3 are removed from first bearing seat 2, then in reality
Installation second bearing seat 6 on platform 1 is tested, second driving shaft 7 is connected between first bearing seat 2 and second bearing seat 6, by what is removed
Wind mill wind wheel 3 is installed on second driving shaft 7, then the reflective strip 5 at 7 surface mount one of second driving shaft；
Step 6: starting wind-tunnel utilizes non-contact laser revolution counter alignment reflective strip 5 measurement the under wind speed setting
The revolving speed of two transmission shafts 7, and then obtain the revolving speed of wind mill wind wheel 3；
Step 7: repeating step 6, and number of repetition is 7 times, and 7 revolving speed averageds that will acquire, then according to
FormulaSeek the standard deviation of revolving speed, in formula, S is the standard deviation of revolving speed,For mean speed；
Step 8: adjustment wind speed setting repeats step 6 and step 7, obtain mean speed under each wind speed setting and
The standard deviation of revolving speed, table specific as follows:
| Wind speed setting (m/s) | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 |
| Mean speed (r/min) | 603 | 843 | 1191 | 1419 | 1607 | 1805 | 2029 | 2289 | 2742 |
| Standard deviation | 5.3 | 6.0 | 5.8 | 6.1 | 5.7 | 6.2 | 8.1 | 8.5 | 8.4 |
Step 9: under same settings wind speed, seeking the mean speed difference in step 4 and step 8, the difference to
Influence after reflection increase second bearing seat 6 to revolving speed, then sums the difference and the mean speed in step 4, i.e.,
It can obtain eliminating the amendment mean speed that second bearing seat 6 influences；Finally seek the standard deviation in step 4 and step 8
Average value can be obtained and eliminate the amendment standard deviation that second bearing seat 6 influences, table specific as follows:
| Wind speed setting (m/s) | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 |
| It corrects mean speed (r/min) | 623 | 861 | 1217 | 1447 | 1639 | 1835 | 2061 | 2313 | 2770 |
| Correct standard deviation | 5.35 | 6.05 | 5.8 | 6.15 | 5.65 | 6.5 | 8.1 | 8.55 | 8.6 |
Step 10: as shown in figure 3, successively by electrical loading apparatus 8, first shaft coupling 9, torquemeter 10 and second shaft coupling 11
It is connected in series on second driving shaft 7, to constitute complete wind energy conversion system aerodynamic experiment device；
Step 11: starting wind-tunnel, and electrical loading apparatus is in and is not loaded with state, under wind speed setting, utilization is non-contact
Formula laser revolution counter is directed at the revolving speed that reflective strip 5 measures second driving shaft 7, and then obtains the revolving speed of wind mill wind wheel 3；
Step 12: step 11 is repeated, number of repetition is 7 times, and the 7 revolving speed averageds that will acquire, then
According to formulaSeek the standard deviation of revolving speed, in formula, S is the standard deviation of revolving speed,It is average
Revolving speed；
Step 13: adjustment wind speed setting repeats step 11 and step 12, obtains being averaged under each wind speed setting
The standard deviation of revolving speed and revolving speed, table specific as follows:
| Wind speed setting (m/s) | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 |
| Mean speed (r/min) | — | 633 | 897 | 1085 | 1256 | 1523 | 1778 | 2041 | 2420 |
| Standard deviation | — | 6.4 | 6.2 | 6.4 | 6.8 | 6.2 | 7.8 | 8.3 | 9.0 |
Step 14: under same settings wind speed, the mean speed ratio in step 13 and step 9, the ratio are sought
The as mechanical efficiency of wind energy conversion system aerodynamic experiment device, table specific as follows:
| Wind speed setting (m/s) | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 |
| Mean speed n in step 90(r/min) | 623 | 861 | 1217 | 1447 | 1639 | 1835 | 2061 | 2313 | 2770 |
| Mean speed n in step 13Z(r/min) | — | 633 | 897 | 1085 | 1256 | 1523 | 1778 | 2041 | 2420 |
| Mechanical efficiency η (nZ/n0) | — | 0.74 | 0.74 | 0.75 | 0.77 | 0.83 | 0.86 | 0.88 | 0.87 |
Step 15: pass through formula η=c1+c2v+c3v2+c4v3+c5v4Seek revised wind energy conversion system aerodynamic experiment
The mechanical efficiency of device, in formula, η is mechanical efficiency, c1~c5For correction factor, v is wind speed；Specifically, be 6m/s with wind speed,
For five groups of numbers of 8m/s, 10m/s, 11m/s, 12m/s, this five groups of data are brought into above-mentioned formula respectively, it can be deduced that with
Lower five equation groups:
0.74=c1+c2×6+c3×62+c4×63+c5×64
0.75=c1+c2×8+c3×82+c4×83+c5×84
0.83=c1+c2×10+c3×102+c4×103+c5×104
0.86=c1+c2×11+c3×112+c4×113+c5×114
0.88=c1+c2×12+c3×122+c4×123+c5×124
By solving equations, available c1=0.748, c2=-0.0125, c3=-0.0014, c4=0.0026, c5=-
0.0002, it then takes back in formula, η=0.748-0.0125v-0.0014v in embodiment can be obtained2+0.0026v3-
0.0002v4Mechanical efficiency correction formula；Finally, again bring the wind speed setting in experiment in mechanical efficiency correction formula into,
The mechanical efficiency of wind energy conversion system aerodynamic experiment device after can be obtained by being corrected under current wind speed.
The scope of patent protection that scheme in embodiment is not intended to limit the invention, it is all without departing from carried out by the present invention etc.
Effect implements or change, is both contained in the scope of the patents of this case.
Claims (1)
1. a kind of mechanical efficiency measurement method of wind energy conversion system aerodynamic experiment device, it is characterised in that include the following steps:
Step 1: installing experimental bench in wind-tunnel, and first bearing seat is installed on experimental bench, and wind mill wind wheel is passed by first
Moving axis is connected in first bearing seat, then the reflective strip at the first transmission shaft surface mount one；
Step 2: starting wind-tunnel utilizes alignment reflective strip the first transmission of measurement of non-contact laser revolution counter under wind speed setting
The revolving speed of axis, and then obtain the revolving speed of wind mill wind wheel；
Step 3: step 2 is repeated, number of repetition is 7 times, and the 7 revolving speed averageds that will acquire, then according to formulaSeek the standard deviation of revolving speed, in formula, S is the standard deviation of revolving speed,For mean speed；
Step 4: adjustment wind speed setting repeats step 2 and step 3, obtains the mean speed and revolving speed under each wind speed setting
Standard deviation；
Step 5: the first transmission shaft and wind mill wind wheel are removed from first bearing seat, then the second axis is installed on experimental bench
Seat is held, second driving shaft is connected between first bearing seat and second bearing seat, the wind mill wind wheel removed is installed to second
On transmission shaft, the then reflective strip at second driving shaft surface mount one；
Step 6: starting wind-tunnel utilizes alignment reflective strip the second transmission of measurement of non-contact laser revolution counter under wind speed setting
The revolving speed of axis, and then obtain the revolving speed of wind mill wind wheel；
Step 7: step 6 is repeated, number of repetition is 7 times, and the 7 revolving speed averageds that will acquire, then according to formulaSeek the standard deviation of revolving speed, in formula, S is the standard deviation of revolving speed,For mean speed；
Step 8: adjustment wind speed setting repeats step 6 and step 7, obtains the mean speed and revolving speed under each wind speed setting
Standard deviation；
Step 9: under same settings wind speed, the mean speed difference in step 4 and step 8 is sought, the difference is to reflect
Influence after increase second bearing seat to revolving speed, then the difference and the mean speed in step 4 are summed, can obtain
To the amendment mean speed for eliminating second bearing seat influence；Finally seek being averaged for the standard deviation in step 4 and step 8
Value can be obtained and eliminate the amendment standard deviation that second bearing seat influences；
Step 10: electrical loading apparatus, first shaft coupling, torquemeter and second shaft coupling are sequentially connected in series second driving shaft
On, to constitute complete wind energy conversion system aerodynamic experiment device；
Step 11: starting wind-tunnel, and electrical loading apparatus is in and is not loaded with state, under wind speed setting, is swashed using contactless
Light revolution counter is directed at the revolving speed of reflective strip measurement second driving shaft, and then obtains the revolving speed of wind mill wind wheel；
Step 12: repeating step 11, and number of repetition is 7 times, and 7 revolving speed averageds that will acquire, then according to
FormulaSeek the standard deviation of revolving speed, in formula, S is the standard deviation of revolving speed,For mean speed；
Step 13: adjustment wind speed setting repeats step 11 and step 12, obtains the mean speed under each wind speed setting
With the standard deviation of revolving speed；
Step 14: under same settings wind speed, the mean speed ratio in step 13 and step 9 is sought, which is
The mechanical efficiency of wind energy conversion system aerodynamic experiment device；
Step 15: pass through formula η=c1+c2v+c3v2+c4v3+c5v4Seek revised wind energy conversion system aerodynamic experiment device
Mechanical efficiency, in formula, η is mechanical efficiency, c1~c5For correction factor, v is wind speed.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111121658A (en) * | 2019-12-31 | 2020-05-08 | 沈阳航空航天大学 | Blade deformation measuring method under wind turbine aerodynamic performance experiment |
| CN111271230A (en) * | 2020-01-16 | 2020-06-12 | 沈阳航空航天大学 | Method for testing rotating speed interference of support to impeller of horizontal axis wind turbine |
| CN112145376A (en) * | 2020-09-29 | 2020-12-29 | 沈阳航空航天大学 | Method for measuring full-time efficiency of wind turbine |
| CN113188754A (en) * | 2021-04-30 | 2021-07-30 | 沈阳航空航天大学 | Impeller runaway control method in horizontal axis wind turbine aerodynamic performance experiment |
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| CN111271230A (en) * | 2020-01-16 | 2020-06-12 | 沈阳航空航天大学 | Method for testing rotating speed interference of support to impeller of horizontal axis wind turbine |
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| CN113188754A (en) * | 2021-04-30 | 2021-07-30 | 沈阳航空航天大学 | Impeller runaway control method in horizontal axis wind turbine aerodynamic performance experiment |
| CN113188754B (en) * | 2021-04-30 | 2022-06-10 | 沈阳航空航天大学 | Impeller runaway control method in horizontal axis wind turbine aerodynamic performance experiment |
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