CN113074903B - Pressure testing system and method based on blade icing experiment - Google Patents
Pressure testing system and method based on blade icing experiment Download PDFInfo
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- CN113074903B CN113074903B CN202110318881.1A CN202110318881A CN113074903B CN 113074903 B CN113074903 B CN 113074903B CN 202110318881 A CN202110318881 A CN 202110318881A CN 113074903 B CN113074903 B CN 113074903B
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 47
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 24
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- UJCHIZDEQZMODR-BYPYZUCNSA-N (2r)-2-acetamido-3-sulfanylpropanamide Chemical compound CC(=O)N[C@@H](CS)C(N)=O UJCHIZDEQZMODR-BYPYZUCNSA-N 0.000 description 1
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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
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/06—Measuring arrangements specially adapted for aerodynamic testing
Abstract
A pressure testing system and method based on blade icing experiment, the system includes nitrogen cylinder, gas reservoir, air pump, pressure scanning valve and pressure measurement and ice suppression converter, the nitrogen cylinder is used for driving the porous slide block in the pressure measurement and ice suppression converter to change position, realize the conversion of pressure measurement and ice suppression; the air pump is used for supplying air to the air storage tank; the air storage tank is used for suppressing the icing and the blockage of the blade pressure measuring hole by pressure relief and air exhaust; the pressure scanning valve is used for measuring the surface pressure of the blade. The method comprises the following steps: calculating the ice suppression set pressure of the air storage tank; supplementing air according to the set pressure error upper limit of ice suppression; adjusting the pressure-measuring ice-suppressing converter to an ice-suppressing position, removing water in the pressure measuring holes of the blades by the air storage tank in an intermittent pressure-relief and air-exhaust mode to avoid water from freezing in the pressure measuring holes, and executing air-supplementing action when the actual pressure in the air storage tank is lower than the error lower limit of ice-suppressing set pressure; and after the surface of the blade begins to freeze, the pressure measuring and ice inhibiting converter is adjusted to a pressure measuring position, and the pressure scanning valve is used for collecting the surface pressure of the blade.
Description
Technical Field
The invention belongs to the technical field of wind tunnel experiments, and particularly relates to a pressure testing system and method based on a blade icing experiment.
Background
In the aviation field, when an airplane flies under icing meteorological conditions, the phenomenon of icing on components such as wings, engine air inlet channels, blades and the like is easy to occur, particularly, when the surface of the leading edge of the wing is iced, the wing section resistance is increased, the lift force and the critical attack angle are further reduced, the airplane stalls if the lift force is reduced, the maximum lift force of the airplane is smaller than the self gravity if the lift force is heavy, and the airplane is damaged and people die as a result. Therefore, in order to meet the airworthiness requirement, it is very important to know the influence of the wing icing process on the aerodynamic force.
In addition, in the field of civil fan power generation, the pneumatic performance of the blade is directly related to the working efficiency of the wind turbine, and under the icing meteorological condition, an ice layer is condensed on the surface of the blade, so that the working efficiency of the wind turbine is reduced, and finally, the power generation amount is insufficient. Therefore, the influence of icing on the surface of the wind turbine blade on the performance of the wind turbine blade is under urgent research.
In foreign countries, the problem of aircraft icing is noticed very early, a large number of tests and numerical simulation researches on aircraft icing are carried out, tests and numerical simulation on large water drop icing, full-scale airfoil icing simulation and the like are carried out, and a plurality of mature numerical analysis software and complete icing wind tunnel test conditions are formed. In China, the research on the icing of the airplane starts late, mainly numerical simulation on the icing process of an airfoil, analysis on the icing influence of water drop impact characteristics, mass transfer and heat transfer effects and the like, mainly ice type research on the icing of the blade, and force measurement research on the icing of the blade. Therefore, in order to research the influence of blade icing on the local micro-aerodynamics of the blade, it is imperative to design a pressure testing system and a method which can be applied in a blade icing experiment.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a pressure testing system and method based on a blade icing experiment, which can effectively inhibit the icing and blocking of a blade pressure measuring hole in the blade icing experiment, simultaneously can not influence the normal icing of the surface of a blade in the blade icing experiment, realize the purpose of measuring the surface pressure of the blade in the blade icing experiment, and provide a feasible scheme for researching the influence of the blade icing on the local micro-aerodynamics of the blade.
In order to achieve the purpose, the invention adopts the following technical scheme: a pressure test system based on blade icing experiments comprises a nitrogen cylinder, a gas storage tank, a gas pump, a pressure scanning valve and a pressure measuring and ice suppressing converter; the pressure measuring ice suppression converter comprises a shell and a porous slide block; the shell is of a straight cylinder structure, the porous sliding block is positioned in the shell, and the porous sliding block only has linear sliding freedom degree in the shell; a plurality of ventilation through holes are formed in the porous sliding block, are distributed in parallel and are positioned in the same plane, the number of the ventilation through holes is equal to that of the pressure measuring holes on the blade, and the ventilation through holes are communicated with the pressure measuring holes on the blade through pipelines; the shell is axially divided into a pressure measuring position and an ice suppression position; a plurality of pressure measuring vent holes are formed in the side wall of the shell corresponding to the pressure measuring positions, the number of the pressure measuring vent holes is equal to that of the vent through holes, the positions of the pressure measuring vent holes correspond to those of the vent through holes one by one, and the pressure measuring vent holes are communicated with the pressure scanning valve through pipelines; when the porous slide block is positioned at a pressure measuring position, the pressure measuring holes on the blades are communicated with the pressure scanning valve sequentially through the ventilation through holes and the pressure measuring vent holes; an ice suppression vent hole is formed in the side wall of the shell corresponding to the ice suppression position, an ice suppression vent groove is formed in the inner surface of the side wall of the shell on the side of the inner end orifice of the ice suppression vent hole, the outer end orifice of the ice suppression vent hole is communicated with an air outlet of an air storage tank through a pipeline, an air inlet of the air storage tank is communicated with an air outlet of an air pump, and an air inlet of the air pump is communicated with the atmosphere; when the porous slide block is positioned at the ice suppression position, the pressure measuring hole on the blade is communicated with the air storage tank sequentially through the air through hole, the ice suppression air groove and the ice suppression air hole, and a first electric stop valve is arranged on a pipeline between the ice suppression air hole and the air storage tank; a first transposition air inlet and a first transposition air outlet are respectively formed in the end wall plate of the shell on the side where the pressure measuring position is located; a second transposition air inlet and a second transposition air outlet are respectively formed in the end wall plate of the shell on the side of the ice suppression position; the gas outlet of the nitrogen cylinder is output in two paths, the first path is communicated with the first transposition gas inlet, the second path is communicated with the second transposition gas inlet, a second electric stop valve is arranged on a pipeline between the first transposition gas inlet and the nitrogen cylinder, and a third electric stop valve is arranged on a pipeline between the second transposition gas inlet and the nitrogen cylinder; the first transposition air outlet is communicated with the atmosphere, and a fourth electric stop valve is arranged on a pipeline between the first transposition air outlet and the atmosphere; the second transposition air outlet is communicated with the atmosphere, and a fifth electric stop valve is arranged on a pipeline between the second transposition air outlet and the atmosphere; a first transposition driving corrugated pipe is arranged in a cavity in the shell on the side of the pressure measuring position, a pipe orifice at one end of the first transposition driving corrugated pipe is connected to the porous sliding block in a sealing mode, a pipe orifice at the other end of the first transposition driving corrugated pipe is connected to a wall plate at the end part of the shell in a sealing mode, the first transposition air inlet and the first transposition air outlet are both communicated with a pipe cavity of the first transposition driving corrugated pipe, and a first limiting block is arranged on the inner surface of the wall plate at the end part of the shell between the first transposition air inlet and the first transposition air outlet; a second transposition driving corrugated pipe is arranged in the inner cavity of the shell on the side of the ice suppression position, a pipe orifice at one end of the second transposition driving corrugated pipe is connected to the porous slide block in a sealing mode, a pipe orifice at the other end of the second transposition driving corrugated pipe is connected to a wall plate at the end part of the shell in a sealing mode, the second transposition air inlet and the second transposition air outlet are communicated with the pipe cavity of the second transposition driving corrugated pipe, and a second limiting block is arranged on the inner surface of the wall plate at the end part of the shell between the second transposition air inlet and the second transposition air outlet.
The pressure sensor is arranged on the gas storage tank, the pressure of the gas storage tank is monitored in real time through the pressure sensor, and the signal output end of the pressure sensor is electrically connected with the computer; a pressure controller is arranged outside the gas storage tank, the signal input end of the pressure controller is electrically connected with a computer, and the signal output end of the pressure controller is electrically connected with the signal input end of the gas pump; the signal output end of the pressure scanning valve is electrically connected with a computer through a pressure scanning data processor; the wind speed sensor is arranged in the wind tunnel, the real-time wind speed in the wind tunnel is monitored through the wind speed sensor, and the signal output end of the wind speed sensor is electrically connected with the computer; and the signal input ends of the first electric stop valve, the second electric stop valve, the third electric stop valve, the fourth electric stop valve and the fifth electric stop valve are electrically connected with a computer.
A pressure testing method based on a blade icing experiment adopts the pressure testing system based on the blade icing experiment, and comprises the following steps:
the method comprises the following steps: adjusting a first electric stop valve, a second electric stop valve, a third electric stop valve, a fourth electric stop valve and a fifth electric stop valve to be in a closed state;
step two: opening a nitrogen cylinder, and presetting gas supply pressure when the porous slide block is transposed;
step three: starting the air pump, and inflating the air storage tank until the pressure in the air storage tank reaches an initial preset value;
step four: monitoring the real-time wind speed in the wind tunnel through a wind speed sensor;
step five: according to the formula P ═ P0Calculating the ice suppression set pressure of the air storage tank by x (1+0.01 x V), wherein P is the ice suppression set pressure of the air storage tank, and P is0The initial preset pressure of the air storage tank is provided, and V is the actual wind speed in the wind tunnel; the actual wind speed in the wind tunnel only adopts the stable wind speed, and the allowable error of the actual wind speed in the wind tunnel is +/-1 m/s;
step six: starting an air pump to supplement air into the air storage tank until the pressure in the air storage tank reaches the set ice suppression pressure, wherein the allowable error of the set ice suppression pressure is +/-0.01 MPa; air supplement is carried out according to the upper limit of the error of the ice suppression set pressure, and when the ice suppression set pressure is within the allowable error range, air supplement action does not need to be executed;
step seven: when blade icing experiments are carried out in the wind tunnel, the second electric stop valve and the fifth electric stop valve are adjusted to be in an opening state, a nitrogen bottle inflates air into the second transposition driving corrugated pipe, the second transposition driving corrugated pipe inflates the air and extends to drive the porous slide block to move to the ice inhibition position until the porous slide block abuts against the first limiting block, and at the moment, the pressure measuring hole in the blade is communicated with the ice inhibition vent hole through the air through hole and the ice inhibition vent groove in sequence;
step eight: the second electric stop valve and the fifth electric stop valve are adjusted to be in a closed state, the first electric stop valve is adjusted to be in an open state, the ice suppression vent hole is communicated with the air storage tank, and the air storage tank removes water in the blade pressure measuring hole through pressure relief exhaust airflow to avoid water from freezing in the pressure measuring hole; wherein, the pressure relief and the exhaust of the air storage tank adopt an intermittent pressure relief and exhaust mode according to a formula T ═ T0-0.5×V2Calculating the single pressure relief exhaust time of the gas storage tank, wherein T is the single pressure relief exhaust time of the gas storage tank, and T0Setting time length for pressure relief exhaust intervals, wherein V is the actual wind speed in the wind tunnel; when the actual pressure in the air storage tank is lower than the error lower limit of the ice suppression set pressure, air supplementing is executed, and air is supplemented according to the error upper limit of the ice suppression set pressure;
step nine: after the surface of the blade begins to freeze, the third electric stop valve and the fourth electric stop valve are adjusted to be in an open state, a nitrogen bottle is used for inflating the inside of the first transposition driving corrugated pipe, the first transposition driving corrugated pipe is inflated to extend to drive the porous slide block to move to the pressure measuring position until the porous slide block abuts against the second limiting block, at the moment, the pressure measuring hole in the blade is communicated with the pressure scanning valve sequentially through the ventilating through hole and the pressure measuring vent hole, the surface pressure of the blade is collected through the pressure scanning valve, and then the surface pressure of the blade is processed by the pressure scanning data processor and then uploaded to a computer;
step ten: and adjusting the third electric stop valve and the fourth electric stop valve to be in a closed state, adjusting the second electric stop valve and the fifth electric stop valve to be in an open state, returning the porous slide block to the ice suppression position again, and then continuously performing intermittent pressure relief and exhaust to prevent the blade pressure measuring hole from being frozen and blocked.
The invention has the beneficial effects that:
the pressure testing system and method based on the blade icing experiment can effectively inhibit the icing and blocking of the blade pressure measuring hole in the blade icing experiment, meanwhile, the normal icing of the surface of the blade in the blade icing experiment cannot be influenced, the purpose of measuring the surface pressure of the blade in the blade icing experiment is achieved, and a feasible scheme is provided for researching the influence of the blade icing on the local micro-pneumatics of the blade.
Drawings
FIG. 1 is a schematic structural diagram of a pressure testing system (a porous slide block is at a pressure measuring position) based on blade icing experiments according to the present invention;
FIG. 2 is a schematic structural diagram of a pressure testing system (with a porous slider at an ice suppression position) based on a blade icing test according to the present invention;
in the figure, 1-nitrogen cylinder, 2-gas storage tank, 3-gas pump, 4-pressure scanning valve, 5-shell, 6-porous slide block, 7-ventilation through hole, 8-blade, 9-pressure measurement vent hole, 10-ice suppression vent hole, 11-ice suppression vent groove, 12-first electric stop valve, 13-first transposition air inlet, 14-first transposition air outlet, 15-second transposition air inlet, 16-second transposition air outlet, 17-second electric stop valve, 18-third electric stop valve, 19-fourth electric stop valve, 20-fifth electric stop valve, 21-first transposition drive corrugated pipe, 22-first limiting block, 23-second transposition drive corrugated pipe and 24-second limiting block.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
As shown in fig. 1 and 2, a pressure testing system based on a blade icing experiment comprises a nitrogen cylinder 1, a gas storage tank 2, a gas pump 3, a pressure scanning valve 4 and a pressure measuring and ice suppressing converter; the pressure measuring ice suppression converter comprises a shell 5 and a porous slide block 6; the shell 5 is of a straight cylinder structure, the porous sliding block 6 is positioned in the shell 5, and the porous sliding block 6 only has linear sliding freedom in the shell 5; a plurality of ventilation through holes 7 are formed in the porous sliding block 6, the ventilation through holes 7 are distributed in parallel and are positioned in the same plane, the number of the ventilation through holes 7 is equal to that of the pressure measuring holes on the blades 8, and the ventilation through holes 7 are communicated with the pressure measuring holes on the blades 8 through pipelines; the interior of the shell 5 is axially divided into a pressure measuring position and an ice suppression position; a plurality of pressure measuring vent holes 9 are formed in the side wall of the shell 5 corresponding to the pressure measuring positions, the number of the pressure measuring vent holes 9 is equal to that of the vent through holes 7, the positions of the pressure measuring vent holes are in one-to-one correspondence, and the pressure measuring vent holes 9 are communicated with the pressure scanning valve 4 through pipelines; when the porous slide block 6 is positioned at a pressure measuring position, the pressure measuring holes on the blades 8 are communicated with the pressure scanning valve 4 sequentially through the ventilation through holes 7 and the pressure measuring vent holes 9; an ice suppression vent hole 10 is formed in the side wall of the shell 5 corresponding to the ice suppression position, an ice suppression vent groove 11 is formed in the inner surface of the side wall of the shell 5 on the side of the inner end orifice of the ice suppression vent hole 10, the outer end orifice of the ice suppression vent hole 10 is communicated with the air outlet of the air storage tank 2 through a pipeline, the air inlet of the air storage tank 2 is communicated with the air outlet of the air pump 3, and the air inlet of the air pump 3 is communicated with the atmosphere; when the porous slide block 6 is positioned at the ice suppression position, the pressure measuring hole on the blade 8 is communicated with the air storage tank 2 sequentially through the air through hole 7, the ice suppression air through groove 11 and the ice suppression air through hole 10, and a first electric stop valve 12 is arranged on a pipeline between the ice suppression air through hole 10 and the air storage tank 2; a first transposition air inlet 13 and a first transposition air outlet 14 are respectively formed in the end wall plate of the shell 5 on the side where the pressure measuring position is located; a second transposition air inlet 15 and a second transposition air outlet 16 are respectively formed in the end wall plate of the shell 5 on the side of the ice suppression position; the gas outlet of the nitrogen cylinder 1 is output in two ways, the first way is communicated with the first transposition gas inlet 13, the second way is communicated with the second transposition gas inlet 15, a second electric stop valve 17 is arranged on a pipeline between the first transposition gas inlet 13 and the nitrogen cylinder 1, and a third electric stop valve 18 is arranged on a pipeline between the second transposition gas inlet 15 and the nitrogen cylinder 1; the first transposition air outlet 14 is communicated with the atmosphere, and a fourth electric stop valve 19 is arranged on a pipeline between the first transposition air outlet 14 and the atmosphere; the second transposition air outlet 16 is communicated with the atmosphere, and a fifth electric stop valve 20 is arranged on a pipeline between the second transposition air outlet 16 and the atmosphere; a first transposition driving corrugated pipe 21 is arranged in a cavity in the shell 5 on the side where the pressure measuring position is located, a pipe orifice at one end of the first transposition driving corrugated pipe 21 is connected to the porous sliding block 6 in a sealing mode, a pipe orifice at the other end of the first transposition driving corrugated pipe 21 is connected to a wall plate at the end part of the shell 5 in a sealing mode, the first transposition air inlet 13 and the first transposition air outlet 14 are both communicated with a pipe cavity of the first transposition driving corrugated pipe 21, and a first limiting block 22 is arranged on the inner surface of the wall plate at the end part of the shell 5 between the first transposition air inlet 13 and the first transposition air outlet 14; a second transposition driving corrugated pipe 23 is arranged in the inner cavity of the shell 5 on the side of the ice suppression position, a pipe orifice at one end of the second transposition driving corrugated pipe 23 is connected to the porous slide block 6 in a sealing mode, a pipe orifice at the other end of the second transposition driving corrugated pipe 23 is connected to a wall plate at the end part of the shell 5 in a sealing mode, the second transposition air inlet 15 and the second transposition air outlet 16 are both communicated with the pipe cavity of the second transposition driving corrugated pipe 23, and a second limiting block 24 is arranged on the inner surface of the wall plate at the end part of the shell 5 between the second transposition air inlet 15 and the second transposition air outlet 16.
The pressure sensor is arranged on the gas storage tank 2, the pressure of the gas storage tank 2 is monitored in real time through the pressure sensor, and the signal output end of the pressure sensor is electrically connected with a computer; a pressure controller is arranged outside the gas storage tank 2, the signal input end of the pressure controller is electrically connected with a computer, and the signal output end of the pressure controller is electrically connected with the signal input end of the gas pump 3; the signal output end of the pressure scanning valve 4 is electrically connected with a computer through a pressure scanning data processor; the wind speed sensor is arranged in the wind tunnel, the real-time wind speed in the wind tunnel is monitored through the wind speed sensor, and the signal output end of the wind speed sensor is electrically connected with the computer; and signal input ends of the first electric stop valve 12, the second electric stop valve 17, the third electric stop valve 18, the fourth electric stop valve 19 and the fifth electric stop valve 20 are all electrically connected with a computer.
In this embodiment, the chord length of the blade 8 is 100mm, the span length of the blade 8 is 300mm, 10 pressure measuring holes are respectively formed in the upper and lower surfaces of the blade 8, and the airfoil shape of the blade 8 is NACA 0018.
A pressure testing method based on a blade icing experiment adopts the pressure testing system based on the blade icing experiment, and comprises the following steps:
the method comprises the following steps: the first electric shutoff valve 12, the second electric shutoff valve 17, the third electric shutoff valve 18, the fourth electric shutoff valve 19, and the fifth electric shutoff valve 20 are all adjusted to a closed state;
step two: opening the nitrogen cylinder 1, and presetting the air supply pressure when the porous slide block 6 is transposed; in this embodiment, the preset value of the air supply pressure when the porous slide block 6 is transposed is 0.8 MPa;
step three: starting the air pump 3, and inflating the air storage tank 2 until the pressure in the air storage tank 2 reaches an initial preset value;
step four: monitoring the real-time wind speed in the wind tunnel through a wind speed sensor;
step (ii) ofFifthly: according to the formula P ═ P0X (1+0.01 XV) calculating the ice suppression set pressure of the air tank 2, wherein P is the ice suppression set pressure of the air tank 2, P is0The initial preset pressure of the gas storage tank 2 is provided, and V is the actual wind speed in the wind tunnel; the actual wind speed in the wind tunnel only adopts the stable wind speed, and the allowable error of the actual wind speed in the wind tunnel is +/-1 m/s; in this embodiment, the initial predetermined pressure P of the air tank 20The pressure is 0.1MPa, the actual wind speed V in the wind tunnel is 20m/s, and the ice suppression set pressure P of the obtained gas storage tank 2 is 0.12 MPa;
step six: starting the air pump 3, supplying air into the air storage tank 2 until the pressure in the air storage tank 2 reaches the ice suppression set pressure, wherein the allowable error of the ice suppression set pressure is +/-0.01 MPa; air supplement is carried out according to the upper limit of the error of the ice suppression set pressure, and when the ice suppression set pressure is within the allowable error range, air supplement action does not need to be executed; in the embodiment, the upper limit of the error of the ice suppression set pressure P is 0.13MPa, and the lower limit of the error of the ice suppression set pressure P is 0.11 MPa;
step seven: when a blade icing experiment is carried out in the wind tunnel, the second electric stop valve 17 and the fifth electric stop valve 20 are adjusted to be in an open state, the nitrogen cylinder 1 inflates air into the second transposition driving corrugated pipe 23, the second transposition driving corrugated pipe 23 inflates air to extend to drive the porous slide block 6 to move to the ice suppression position until the porous slide block 6 abuts against the first limiting block 22, and at the moment, the pressure measuring holes in the blades 8 are communicated with the ice suppression vent holes 10 sequentially through the air through holes 7 and the ice suppression vent grooves 11;
step eight: the second electric stop valve 17 and the fifth electric stop valve 20 are adjusted to be in a closed state, the first electric stop valve 12 is adjusted to be in an open state, the ice suppression vent hole 10 is communicated with the air storage tank 2 at the moment, and the air storage tank 2 removes water in the pressure measuring hole of the blade 8 through pressure relief exhaust airflow to avoid the water from freezing in the pressure measuring hole; wherein, the pressure relief and the exhaust of the air storage tank 2 adopt an intermittent pressure relief and exhaust mode according to a formula T ═ T0-0.5×V2Calculating the single pressure relief exhaust time of the gas storage tank 2, wherein T is the single pressure relief exhaust time of the gas storage tank 2, and T0Setting time length for pressure relief exhaust intervals, wherein V is the actual wind speed in the wind tunnel; wherein, when the air storage tank 2 is arrangedWhen the actual pressure is lower than the error lower limit of the ice suppression set pressure, air supplement action is executed, and air supplement is carried out according to the error upper limit of the ice suppression set pressure; in the embodiment, the pressure relief and exhaust interval is set to be 1000ms, the actual wind speed V in the wind tunnel is 20m/s, the single pressure relief and exhaust time T of the gas storage tank 2 can be obtained to be 800ms, when the actual pressure in the gas storage tank 2 is lower than the ice suppression set pressure error lower limit of 0.11MPa, the gas supplementing action is executed, and the gas is supplemented according to the ice suppression set pressure error upper limit of 0.13 MPa;
step nine: after the surface of the blade 8 begins to freeze, the third electric stop valve 18 and the fourth electric stop valve 19 are adjusted to be in an open state, the nitrogen cylinder 1 inflates air into the first transposition driving corrugated pipe 21, the first transposition driving corrugated pipe 21 is inflated to extend to drive the porous slide block 6 to move to a pressure measuring position until the porous slide block 6 abuts against the second limiting block 24, at the moment, a pressure measuring hole in the blade 8 is communicated with the pressure scanning valve 4 sequentially through the air through hole 7 and the pressure measuring vent hole 9, the surface pressure of the blade 8 is collected through the pressure scanning valve 4, and then the surface pressure is uploaded to a computer after being processed by the pressure scanning data processor;
step ten: the third electric stop valve 18 and the fourth electric stop valve 19 are adjusted to be in a closed state, the second electric stop valve 17 and the fifth electric stop valve 20 are adjusted to be in an open state, the porous slide block 6 is enabled to return to the ice suppression position again, and then intermittent pressure relief and exhaust are continuously performed, so that the icing and blockage of the pressure measuring hole of the blade 8 are prevented.
After the blade icing experiment is finished, the surface pressure of the blade 8 can be measured in the blade icing experiment under other working conditions continuously by changing the attack angle or the experiment wind speed of the blade 8.
The embodiments are not intended to limit the scope of the present invention, and all equivalent implementations or modifications without departing from the scope of the present invention are intended to be included in the scope of the present invention.
Claims (3)
1. The utility model provides a pressure test system based on blade experiment that freezes which characterized in that: comprises a nitrogen cylinder, a gas storage tank, a gas pump, a pressure scanning valve and a pressure measuring and ice suppressing converter; the pressure measuring ice suppression converter comprises a shell and a porous slide block; the shell is of a straight cylinder structure, the porous sliding block is positioned in the shell, and the porous sliding block only has linear sliding freedom degree in the shell; a plurality of ventilation through holes are formed in the porous sliding block, are distributed in parallel and are positioned in the same plane, the number of the ventilation through holes is equal to that of the pressure measuring holes on the blade, and the ventilation through holes are communicated with the pressure measuring holes on the blade through pipelines; the shell is axially divided into a pressure measuring position and an ice suppression position; a plurality of pressure measuring vent holes are formed in the side wall of the shell corresponding to the pressure measuring positions, the number of the pressure measuring vent holes is equal to that of the vent through holes, the positions of the pressure measuring vent holes correspond to those of the vent through holes one by one, and the pressure measuring vent holes are communicated with the pressure scanning valve through pipelines; when the porous slide block is positioned at a pressure measuring position, the pressure measuring holes on the blades are communicated with the pressure scanning valve sequentially through the ventilation through holes and the pressure measuring vent holes; an ice suppression vent hole is formed in the side wall of the shell corresponding to the ice suppression position, an ice suppression vent groove is formed in the inner surface of the side wall of the shell on the side of the inner end orifice of the ice suppression vent hole, the outer end orifice of the ice suppression vent hole is communicated with an air outlet of an air storage tank through a pipeline, an air inlet of the air storage tank is communicated with an air outlet of an air pump, and an air inlet of the air pump is communicated with the atmosphere; when the porous slide block is positioned at the ice suppression position, the pressure measuring hole on the blade is communicated with the air storage tank sequentially through the air through hole, the ice suppression air groove and the ice suppression air hole, and a first electric stop valve is arranged on a pipeline between the ice suppression air hole and the air storage tank; a first transposition air inlet and a first transposition air outlet are respectively formed in the end wall plate of the shell on the side where the pressure measuring position is located; a second transposition air inlet and a second transposition air outlet are respectively formed in the end wall plate of the shell on the side of the ice suppression position; the gas outlet of the nitrogen cylinder is output in two paths, the first path is communicated with the first transposition gas inlet, the second path is communicated with the second transposition gas inlet, a second electric stop valve is arranged on a pipeline between the first transposition gas inlet and the nitrogen cylinder, and a third electric stop valve is arranged on a pipeline between the second transposition gas inlet and the nitrogen cylinder; the first transposition air outlet is communicated with the atmosphere, and a fourth electric stop valve is arranged on a pipeline between the first transposition air outlet and the atmosphere; the second transposition air outlet is communicated with the atmosphere, and a fifth electric stop valve is arranged on a pipeline between the second transposition air outlet and the atmosphere; a first transposition driving corrugated pipe is arranged in a cavity in the shell on the side of the pressure measuring position, a pipe orifice at one end of the first transposition driving corrugated pipe is connected to the porous sliding block in a sealing mode, a pipe orifice at the other end of the first transposition driving corrugated pipe is connected to a wall plate at the end part of the shell in a sealing mode, the first transposition air inlet and the first transposition air outlet are both communicated with a pipe cavity of the first transposition driving corrugated pipe, and a first limiting block is arranged on the inner surface of the wall plate at the end part of the shell between the first transposition air inlet and the first transposition air outlet; a second transposition driving corrugated pipe is arranged in the inner cavity of the shell on the side of the ice suppression position, a pipe orifice at one end of the second transposition driving corrugated pipe is connected to the porous slide block in a sealing mode, a pipe orifice at the other end of the second transposition driving corrugated pipe is connected to a wall plate at the end part of the shell in a sealing mode, the second transposition air inlet and the second transposition air outlet are communicated with the pipe cavity of the second transposition driving corrugated pipe, and a second limiting block is arranged on the inner surface of the wall plate at the end part of the shell between the second transposition air inlet and the second transposition air outlet.
2. The pressure testing system based on blade icing experiments as claimed in claim 1, wherein: the pressure sensor is arranged on the gas storage tank, the pressure of the gas storage tank is monitored in real time through the pressure sensor, and the signal output end of the pressure sensor is electrically connected with the computer; a pressure controller is arranged outside the gas storage tank, the signal input end of the pressure controller is electrically connected with a computer, and the signal output end of the pressure controller is electrically connected with the signal input end of the gas pump; the signal output end of the pressure scanning valve is electrically connected with a computer through a pressure scanning data processor; the wind speed sensor is arranged in the wind tunnel, the real-time wind speed in the wind tunnel is monitored through the wind speed sensor, and the signal output end of the wind speed sensor is electrically connected with the computer; and the signal input ends of the first electric stop valve, the second electric stop valve, the third electric stop valve, the fourth electric stop valve and the fifth electric stop valve are electrically connected with a computer.
3. A pressure testing method based on a blade icing experiment, which adopts the pressure testing system based on the blade icing experiment of claim 1, and is characterized by comprising the following steps:
the method comprises the following steps: adjusting a first electric stop valve, a second electric stop valve, a third electric stop valve, a fourth electric stop valve and a fifth electric stop valve to be in a closed state;
step two: opening a nitrogen cylinder, and presetting gas supply pressure when the porous slide block is transposed;
step three: starting the air pump, and inflating the air storage tank until the pressure in the air storage tank reaches an initial preset value;
step four: monitoring the real-time wind speed in the wind tunnel through a wind speed sensor;
step five: according to the formula P ═ P0Calculating the ice suppression set pressure of the air storage tank by x (1+0.01 x V), wherein P is the ice suppression set pressure of the air storage tank, and P is0The initial preset pressure of the air storage tank is provided, and V is the actual wind speed in the wind tunnel; the actual wind speed in the wind tunnel only adopts the stable wind speed, and the allowable error of the actual wind speed in the wind tunnel is +/-1 m/s;
step six: starting an air pump to supplement air into the air storage tank until the pressure in the air storage tank reaches the set ice suppression pressure, wherein the allowable error of the set ice suppression pressure is +/-0.01 MPa; air supplement is carried out according to the upper limit of the error of the ice suppression set pressure, and when the ice suppression set pressure is within the allowable error range, air supplement action does not need to be executed;
step seven: when blade icing experiments are carried out in the wind tunnel, the second electric stop valve and the fifth electric stop valve are adjusted to be in an opening state, a nitrogen bottle inflates air into the second transposition driving corrugated pipe, the second transposition driving corrugated pipe inflates the air and extends to drive the porous slide block to move to the ice inhibition position until the porous slide block abuts against the first limiting block, and at the moment, the pressure measuring hole in the blade is communicated with the ice inhibition vent hole through the air through hole and the ice inhibition vent groove in sequence;
step eight: a second electric stop valve and a fifth electric stop valveThe check valve is adjusted to be in a closed state, the first electric stop valve is adjusted to be in an open state, the ice suppression vent hole is communicated with the air storage tank, and the air storage tank removes water in the pressure measuring hole of the blade through pressure relief exhaust airflow to avoid water from freezing in the pressure measuring hole; wherein, the pressure relief and the exhaust of the air storage tank adopt an intermittent pressure relief and exhaust mode according to a formula T ═ T0-0.5×V2Calculating the single pressure relief exhaust time of the gas storage tank, wherein T is the single pressure relief exhaust time of the gas storage tank, and T0Setting time length for pressure relief exhaust intervals, wherein V is the actual wind speed in the wind tunnel; when the actual pressure in the air storage tank is lower than the error lower limit of the ice suppression set pressure, air supplementing is executed, and air is supplemented according to the error upper limit of the ice suppression set pressure;
step nine: after the surface of the blade begins to freeze, the third electric stop valve and the fourth electric stop valve are adjusted to be in an open state, a nitrogen bottle is used for inflating the inside of the first transposition driving corrugated pipe, the first transposition driving corrugated pipe is inflated to extend to drive the porous slide block to move to the pressure measuring position until the porous slide block abuts against the second limiting block, at the moment, the pressure measuring hole in the blade is communicated with the pressure scanning valve sequentially through the ventilating through hole and the pressure measuring vent hole, the surface pressure of the blade is collected through the pressure scanning valve, and then the surface pressure of the blade is processed by the pressure scanning data processor and then uploaded to a computer;
step ten: and adjusting the third electric stop valve and the fourth electric stop valve to be in a closed state, adjusting the second electric stop valve and the fifth electric stop valve to be in an open state, returning the porous slide block to the ice suppression position again, and then continuously performing intermittent pressure relief and exhaust to prevent the blade pressure measuring hole from being frozen and blocked.
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