CN115828617A - Fan blade icing and power loss experiment and calculation method thereof - Google Patents
Fan blade icing and power loss experiment and calculation method thereof Download PDFInfo
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Abstract
The invention relates to the technical field of fan blade icing prediction, and discloses fan blade icing and a power loss experiment and calculation method thereof, which are used for establishing a fan blade icing power change quantitative relation model and realizing fan blade icing power loss calculation. The method comprises the following steps: testing a fan model in a phytotron to obtain collected data under different working conditions, wherein the collected data comprises current and voltage values under different measured icing thicknesses and different wind speeds; and then obtaining the total output of the fan, the wind energy utilization coefficient and the power loss function under the conditions of different ice coating thicknesses and fan blades under different wind speeds based on the collected data, and further obtaining the power losses corresponding to the different ice coating thicknesses and different wind speeds.
Description
Technical Field
The invention relates to the technical field of fan blade icing prediction, in particular to fan blade icing and a power loss experiment and calculation method thereof.
Background
With the rapid increase of the wind power clean energy installation machine and the gradual increase of the scale of the wind power installation machine, the influence of wind power integration on the safety and stability of a power system is gradually highlighted. The large-scale construction of the wind power station brings challenges to the safe and stable operation of a power grid. In recent years, operation accidents including large-scale wind power system tripping have occurred at home and abroad.
At present, aiming at the problem of fan icing, the technical research of monitoring and early warning is mainly carried out, the power loss caused by fan blade icing is not considered, and improvement is urgently needed.
Disclosure of Invention
The invention aims to disclose a fan blade icing and a power loss experiment and calculation method thereof, which are used for establishing a fan blade icing power change quantitative relation model and realizing fan blade icing power loss calculation.
To achieve the above object, the method of the present invention comprises:
(1) Basic experimental conditions were prepared. Selecting a phytotron with temperature regulation, precipitation regulation and wind speed regulation according to requirements; preparing a small fan model and power generation equipment thereof; preparing devices such as an ammeter, a data acquisition card, a universal meter, a thermometer, a barometer, a vernier caliper and the like.
(2) The small fan model and the power generation equipment thereof are placed in a simulated environment of a climatic chamber, a three-phase delta-shaped circuit is combined according to a fan output curve, the resistance between every two phases is set to be R ohm, the resistance value of the equivalent Y-shaped circuit is R/3 ohm, and two ends of the resistance on the A phase are respectively connected with a data acquisition terminal of a data acquisition card.
(3) And fixing the upright rod on a fan base, and marking different positions of the fan blade in the unfolding direction at the same time for recording the ice thickness of the fan blade at different positions in the unfolding direction.
(4) Opening a refrigeration system of the artificial climate chamber, setting the ambient temperature to be a fixed value, opening a simulated wind system when the ambient temperature is reduced to the fixed value, and setting the wind speed to be v 0 And m/s, closing the fan connecting circuit, opening a data acquisition card driving program, and starting to receive voltage and current waveforms of the three-phase circuit.
(5) And (3) after the operation is carried out for t minutes, closing the simulated wind system and the liquid outlet system, bringing the system with a protection tool into a phytotron, and measuring and recording the thickness of the ice coating (including the thickness of the blade) at the marked position on the fan blade by using a vernier caliper: and storing the voltage and current waveforms recorded on the data acquisition card.
(6) Under the condition of not removing ice, the fan is raised again, meanwhile, a data acquisition program and a simulated wind system of the artificial climate chamber are opened, a plurality of wind speeds with an interval delta v are set, and the steps (5) to (6) are repeated;
(7) Prolonging the running time to be unequal, and repeating the steps (5) to (7);
(8) And after the experiment is finished, storing the recorded data, disconnecting all power supplies, arranging the experimental instruments and recovering the experimental site.
(9) Calculating according to the current and voltage values of different icing thicknesses and different wind speeds measured by a data acquisition card to obtain the total output of the fan:
(10) Further, the wind energy utilization coefficient under the condition of the fan blade under the conditions of different icing thicknesses and different wind speeds can be calculated:
wherein, C p(v,I) The wind energy utilization coefficient P is the wind energy utilization coefficient when the wind speed is v and the ice coating thickness is I w For output power, r is the wind sweeping radius of the wind wheel, v is the inflow wind speed, and pi is the circumferential rate;
ρ is the air density, calculated as follows:
where p is the gas pressure, J is the gas constant, 287J/kg.K.
(11) Power curve based on non-icing and wind energy utilization coefficient C thereof p(v,0) And calculating power loss coefficients under different wind speeds v and icing thicknesses I:
wherein, Δ C p(v,I) The wind speed v and the power loss coefficient at the icing thickness I are taken as the parameters; c p(v,I) The wind energy utilization coefficient when the wind speed is v and the ice coating thickness is I is C p(v,0) The wind energy utilization coefficient is the wind speed v and the icing thickness is 0.
(12) Calculating to obtain the power loss when the wind speed is v and the icing thickness is I:
ΔP w(v,I) ＝ΔC p(v,I) ×P w(v,0)
wherein, P w(v,0) The power output value when the fan is not coated with ice and the wind speed is v can be obtained by the power curve of the fan.
The invention has the following beneficial effects:
testing a fan model in a phytotron to obtain collected data under different working conditions, wherein the collected data comprises current and voltage values under different measured icing thicknesses and different wind speeds; and then obtaining the total output of the fan, the wind energy utilization coefficient and the power loss function under the conditions of different ice coating thicknesses and fan blades under different wind speeds based on the collected data, and further obtaining the power losses corresponding to the different ice coating thicknesses and different wind speeds. Simple and easy to operate, and reliable data acquisition! The quantitative relation model of the icing power change of the fan blade can be conveniently and reliably established, and the icing power loss calculation of the fan blade is realized.
The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments 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 view of a wind speed-power curve calculated for different ice coating thicknesses according to an embodiment of the present invention.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.
Example 1
Step 1, preparing basic experimental conditions. Selecting an artificial climate laboratory with temperature regulation, precipitation regulation and wind speed regulation according to requirements; preparing an NF-200TS small fan model with rated power of 200w, rated voltage of 24v and starting wind speed of 2m/s and power generation equipment thereof; preparing a cl011mm ammeter, a data acquisition card, a FLUKE17B multimeter, an IES-1310 thermometer, a Pdca9000 barometer, a YCDCA-100 vernier caliper and other devices.
And 2, placing the small fan model and the power generation equipment thereof in a simulated environment of a climatic chamber, combining a three-phase delta-shaped circuit according to a fan output curve, setting the resistance between every two phases to be 180 ohms, setting the resistance value of the equivalent Y-shaped circuit to be 60 ohms, and respectively connecting the two ends of the resistance on the A phase to AI0 and AI1 data acquisition terminals of a data acquisition card.
And 3, fixing the upright rod on the fan base, marking different positions of the fan blade in the unfolding direction, and recording the ice thickness of the fan blade at different positions in the unfolding direction.
Step 4, opening a refrigeration system of the artificial climate chamber, and setting the ambient temperature to be-4 ℃; and when the ambient temperature is about-4 ℃, opening the simulation wind system, setting the wind speed to be 3m/s, closing the fan connecting circuit, opening the data acquisition card driving program, and starting to receive the voltage and current waveforms of the three-phase circuit.
And 5, after the operation is carried out for 10 minutes, closing the simulated wind system and the liquid outlet system, bringing the system with a protective tool into a phytotron, and measuring and recording the thickness of the ice coating (including the thickness of the blade) at the marked position on the fan blade by using a vernier caliper: and storing the voltage and current waveforms recorded on the data acquisition card.
And 6, re-erecting the fan, simultaneously opening a data acquisition program and a simulated wind system of the artificial climate chamber, setting the data acquisition program and the simulated wind system to be 4m/s, 5m/s and 6m/s for 8230, 8230and 10m/s, and repeating the steps (5) to (6).
And 7, prolonging the running time unequal, and repeating the steps (5) - (7).
And 8, after the experiment is finished, storing the recorded data, disconnecting all power supplies, arranging the experimental instruments and recovering the experimental site.
Step 9, calculating according to the current and voltage values of different icing thicknesses and different wind speeds measured by the data acquisition card to obtain the total output of the fan:
wherein, P w Is the total output of the fan, U Is effective Is the effective value of A phase voltage, I, of the data acquisition card Is effective The effective value of the phase A current of the data acquisition card is shown.
wherein, C p(v,I) The wind energy utilization coefficient P is the wind energy utilization coefficient when the wind speed is v and the ice coating thickness is I w For output power, r is the wind sweeping radius of the wind wheel, v is the inflow wind speed, and pi is the circumferential rate; ρ is the air density, calculated as follows:
where p is the gas pressure and J is the gas constant, typically 287J/kg K.
Step 11, based on the power curve when the ice is not coated and the wind energy utilization coefficient C thereof p(v,0) And calculating power loss coefficients under different wind speeds v and icing thicknesses I:
wherein, is p(v,I) The wind speed v and the power loss coefficient at the icing thickness I are shown; c p(v,I) The wind energy utilization coefficient when the wind speed is v and the ice coating thickness is I is C p(v,0) The wind energy utilization coefficient is the wind speed v and the ice coating thickness is 0 (namely, the ice coating is not coated).
And 12, calculating the power loss when the wind speed is v and the icing thickness is I:
ΔP w(v,I) ＝ΔC p(v,I) ×P w(v,0)
wherein, P w(v,0) The power output value when the fan is not coated with ice and the wind speed is v can be obtained by the power curve of the fan.
The wind speed-power curves for different ice coating thicknesses are shown in fig. 1.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. A fan blade icing and power loss experiment and calculation method is characterized by comprising the following steps:
(1) Preparing basic experimental conditions;
(2) Placing a small fan model and power generation equipment thereof in a simulated environment of a phytotron, combining a three-phase delta-shaped circuit according to a fan output curve, setting the resistance between every two phases as R ohm, wherein the resistance value of the equivalent Y-shaped circuit is R/3 ohm, and respectively connecting the two ends of the resistance on the A phase into data acquisition terminals of a data acquisition card;
(3) Fixing the upright rod on a fan base, marking different positions of a fan blade in the unfolding direction, and recording the thickness of ice coated at different positions of the fan blade in the unfolding direction;
(4) Opening a refrigeration system of the artificial climate chamber, setting the ambient temperature to be a fixed value, opening a simulated wind system when the ambient temperature is reduced to the fixed value, and setting the wind speed to be v 0 m/s, closing a fan connecting circuit, opening a data acquisition card driving program, and starting to receive voltage and current waveforms of the three-phase circuit;
(5) After the operation is carried out for t minutes, the simulated wind system and the liquid outlet system are closed, a protective tool is provided, the system enters a phytotron, and the thickness of the ice coating containing the thickness of the blade at the marked position on the fan blade is measured and recorded by using a vernier caliper: storing the voltage and current waveforms recorded on the data acquisition card;
(6) Under the condition of not deicing, the fan is raised again, the data acquisition program and the artificial climate chamber simulation wind system are opened at the same time, a plurality of wind speeds with an interval delta v are set, and the steps (5) to (6) are repeated;
(7) The running time is prolonged unequally, and the steps (5) to (7) are repeated;
(8) After the experiment is finished, storing the recorded data, disconnecting all power supplies, arranging the experimental instruments and recovering the experimental site;
(9) Calculating according to the current and voltage values of different icing thicknesses and different wind speeds measured by a data acquisition card to obtain the total output of the fan:
(10) Calculating the wind energy utilization coefficient of the fan blade under the conditions of different icing thicknesses and different wind speeds:
wherein, C p(v,I) The wind energy utilization coefficient P is the wind energy utilization coefficient when the wind speed is v and the ice coating thickness is I w For output power, r is the wind sweeping radius of a wind wheel, v is the inflow wind speed, and pi is the circumferential ratio; ρ is the air density, calculated as follows:
wherein p is the gas pressure and J is the gas constant;
(11) Power curve based on non-icing and wind energy utilization coefficient C thereof p(v,0) And calculating power loss coefficients under different wind speeds v and icing thicknesses I:
wherein, is p(v,I) The wind speed v and the power loss coefficient at the icing thickness I are shown; c p(v,I) The wind energy utilization coefficient when the wind speed is v and the ice coating thickness is I is C p(v,0) The wind energy utilization coefficient is the wind speed v and the icing thickness is 0;
(12) Calculating to obtain the power loss when the wind speed is v and the ice coating thickness is I:
ΔP w(v,I) ＝ΔC p(v,I) ×P w(v,0)
wherein, P w(v,0) And the power output value is the power output value when the fan is not coated with ice and the wind speed is v.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117638926A (en) * | 2024-01-25 | 2024-03-01 | 国能日新科技股份有限公司 | New energy power prediction method and device based on icing and power coupling modeling |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117638926A (en) * | 2024-01-25 | 2024-03-01 | 国能日新科技股份有限公司 | New energy power prediction method and device based on icing and power coupling modeling |
| CN117638926B (en) * | 2024-01-25 | 2024-04-05 | 国能日新科技股份有限公司 | New energy power prediction method and device based on icing and power coupling modeling |
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