CN204553304U - A kind of axial flow compressor stall margin Analytical system - Google Patents
A kind of axial flow compressor stall margin Analytical system Download PDFInfo
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- CN204553304U CN204553304U CN201520208560.6U CN201520208560U CN204553304U CN 204553304 U CN204553304 U CN 204553304U CN 201520208560 U CN201520208560 U CN 201520208560U CN 204553304 U CN204553304 U CN 204553304U
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Abstract
The utility model discloses a kind of axial flow compressor stall margin Analytical system; For the axial flow compressor be arranged in wind-tunnel major loop, the Accurate Determining to its stall margin can be realized, and fully ensure that this stall margin is applicable to wind-tunnel operating condition of test from now on, and be convenient to monitoring.According to method of the present utility model, measure process safety, reliably, the stall margin determined is accurate; Compared to domestic existing continuous wind tunnel compressor surge boundary estimation method, the method that the utility model relates to is more simple, accurately, safely, reliably, result application is convenient.The stall margin of system measurement using the utility model to relate to is a level and smooth curve, meets the performance characteristics of axial flow compressor, and line style is more succinct, application is more convenient, anti-surge programming and personnel control convenient; Especially for the new demand measured under the different stagnation pressure of needs, different stator blade angle, full operating rotational speed range continuous speed adjustment condition.
Description
Technical field
The utility model relates to mensuration field, turbocompressor stall margin, particularly relates to a kind of stall margin Analytical system of the axial flow compressor be arranged in continuous high-speed wind-tunnel major loop.
Background technique
Regular industrial device axial flow compressor is in open type pipe network mostly, the rotating speed of compressor, inlet flow rate, inlet pressure are all relatively stable, change is less, and continuous wind tunnel is a kind of special pipe network, there is the evident characteristic being different from regular industrial operating mode: wind-tunnel and axial flow compressor form closed loop, resistance of pipe system changes frequently, compressor operating speed range greatly, changeable, the indivedual operating point of operating conditions is near surge area etc., be more prone to surge occurs, and once there is surge, very harmful to the equipment in wind-tunnel loop and axial flow compressor body.
For avoiding compressor generation surge, guaranteeing that wind tunnel test is carried out safely, compressor surge boundary line accurately must be reached out for, to define the operational envelope of compressor.The surge boundary line of theory calculate affects by factors such as numerical calculation degree of accuracy, unit machining errors, certain deviation is often there is with the surge boundary line of reality, this just needs in the on-the-spot artificial enforcement surge test of wind-tunnel, to determine the actual surge boundary line of compressor, then leave appropriate nargin on this basis corresponding anti-surge line is set.
But present stage turbocompressor stall margin mensuration field, particularly continuous high-speed wind-tunnel application, still do not have a set of stall margin Analytical system that can be applied to user scene.Namely allowed to device that stall margin measures or method, also there is equipment and operation interface dispersion, the defect such as post setting is many, program is loaded down with trivial details, security risk is large, measure poor effect; Universality, the reliability of surge decision maker and criterion are not strong, bring considerable risk to the equipment in wind-tunnel loop; Cannot simulate model in wind tunnel from now on produce airflow obstruction, Mach number thick/actual conditions such as accurate adjustment joint, stagnation pressure change, applying working condition scope is little, function is few, research and productive value not good; The method that similar operating condition has adopted, curve composition corresponding to the stall margin obtained is extremely complicated again, and effect of visualization is poor, protection application arranges complexity, inconvenient personnel control.
Visible, existing apparatus and method have been not suitable for continuous wind tunnel construction that China improves constantly, user demand.Therefore, need a kind of compressor surge boundary estimation system of exploitation badly, to reach easy to operate, result accurately, apply convenient, to determine continuous wind tunnel Axial-Flow compressor surge border safely and reliably effect.
Model utility content
The purpose of this utility model is in order to avoid the deficiencies in the prior art part, provides a kind of axial flow compressor stall margin Analytical system.
Adopt following technological scheme for achieving the above object:
A kind of axial flow compressor stall margin Analytical system, this system is made up of supervisory system and PLC control system, by the both-way communication of Ethernet ICP/IP protocol between described PLC control system and supervisory system; Described PLC control system comprises PLC, pressure measurement subtense angle, stator blade regulate subtense angle, compressor rotary speed to regulate subtense angle, force breathe heavily subtense angle, surge judges subtense angle, fast de-ly breathe heavily subtense angle, stagnation pressure regulates subtense angle, each subtense angle is communicated with PLC by datawire; Described supervisory system comprise based on WinCC configuration software monitoring interface and fast de-ly breathe heavily button, de-ly breathe heavily button and be connected with PLC control system.
In technique scheme, described pressure measurement subtense angle comprises the some total-pressure probes, the total temperature probe that are arranged on wind-tunnel stable section and is arranged on some static pressure transducers of test chamber, and is arranged on some static pressure transducers, temperature transducer that compressor imports and exports.
In technique scheme, described compressor rotary speed regulates subtense angle to adopt high voltage AC frequency conversion device to drive asynchronous motor, and PLC is by communicating and hardwire with the modbus of frequency variator.
In technique scheme, described in force and breathe heavily subtense angle and adopt anti-surge valve and two venturi profile mechanisms as Bi Chuan mechanism, described two venturi profile mechanisms comprise two venturi centerbodies and three sections of adjustment sheets.
In technique scheme, described two venturi centerbodies and three sections of adjustment sheets are regulated by profile and reduce or increase two venturi cross-sectional flow area.
In technique scheme, described taking off fast breathes heavily subtense angle, adopt the actuator that the anti-surge bypass on wind-tunnel loop and anti-surge valve are done as de-panting fast, described anti-surge valve is directly breathed heavily button be connected with de-, by take off breathe heavily fingertip control anti-surge valve open function soon.
In technique scheme, described de-button of breathing heavily is breathed heavily button by PLC in PLC control system be connected with de-, monitoring interface arranges virtual taking off and breathes heavily button and anti-surge valve and open function soon and interlock.
A stall margin determining method for axial flow compressor stall margin Analytical system, comprises the following steps:
Step one: after stall margin measures and starts, by inputting target static blade angle, goal pressure successively at monitoring interface, utilize stator blade to regulate subtense angle, wind-tunnel stagnation pressure to regulate subtense angle respectively static blade angle and wind-tunnel stagnation pressure to be adjusted to desired value, and keep in mensuration process;
Step 2: at monitoring interface input rotating speed of target, compressor rotary speed is utilized to regulate subtense angle, take from the slow-speed of revolution, after each ladder stabilization of speed, arrange interface by controling parameters again to close anti-surge valve gradually, regulate the mode of two venturi centerbodies and adjustment sheet to carry out forcing breathing heavily, judge that subtense angle is confirmed whether surge by surge, generation surge is then pressed immediately to take off fast and is breathed heavily button, compressor departs from surge area fast, enters safe work state;
Step 3: after step 2 terminates, now volume flow Q and operating point (flow is minimum, pressure ratio is the highest) corresponding to pressure ratio ε are the pumping point of compressor at current rotating speed ladder; Otherwise, using stalling point or the operating point that flow is minimum, pressure ratio is maximum as " substituting " pumping point; After obtaining pumping point corresponding to current rotating speed, raising speed is to next rotating speed ladder repeat to force the process of breathing heavily;
Step 4: the omnidistance real time record stall margin of monitoring interface measures the data of process, in test or after test, by can be completed the analysis of archive data or the data of all pumping points; Finally, after the pumping point of all rotating speed ladders obtained is connected into line, it is namely the compressor surge border under this wind-tunnel stagnation pressure and compressor target stator blade angle in full operating rotational speed range.
" substituting " pumping point choosing method in above-mentioned steps three is: forcing in the process of breathing heavily, surge, first stall (stall criterion is that compressor pressure ratio reduces suddenly) surge afterwards, stall not surge, neither stall also not surge four kinds of results may be produced, select stalling point or flow is minimum, pressure ratio is maximum operating point as " substituting " pumping point for rear three kinds of situations.
At the decision method of above-mentioned compressor surge be: described surge judges that subtense angle adopts and installs precision pressure gauge in compressor inlet and outlet side, observes the manometric method of the beat of pointer, carries out compressor surge judgement.
In sum, owing to have employed technique scheme, the beneficial effects of the utility model are: the utility model solves the mensuration at present to continuous high-speed wind-tunnel axial flow compressor stall margin, and compared to existing system, apparatus and method, operation interface unification is regular, use is simple; Surge judges more reliable, accurately and safety, avoids the infringement of surge test to compressor and wind-tunnel facilities to greatest extent; The stall margin of system measurement using the utility model to relate to is a level and smooth curve, meets the performance characteristics of axial flow compressor, and line style is more succinct, application is more convenient, anti-surge programming and personnel control convenient; Especially for the new demand measured under the different stagnation pressure of needs, different stator blade angle, full operating rotational speed range continuous speed adjustment condition, the utility model adopts stagnation pressure adjustment cleverly, stator blade regulates and compressor rotary speed regulates subtense angle, achieve stall margin to measure, create good research and productivity effect; On-the-spot to intervene without the need to personnel, visualized, avoid the excessive risk that high rotating speed, High Mach number, high voltage are brought; In the continuous high-speed wind-tunnel applied, utilize this stall margin Analytical system, be successfully completed the lower five kinds of different static blade angles of normal pressure (stagnation pressure 100kPa) condition (46 °, 60 °, 66 °, 72 °, 76 °) stall margin to measure, and design static blade angle 66 ° of conditions lower five kinds of different wind-tunnel stagnation pressures (20kPa, 50 kPa, 100kPa, 150 kPa, 250 kPa) stall margin measures.
Accompanying drawing explanation
The utility model illustrates by example and with reference to the mode of accompanying drawing, wherein:
Fig. 1 is stall margin Analytical system functional block diagram;
Fig. 2 is stall margin Analytical system signal wiring and point position schematic diagram;
Fig. 3 is that two venturi centerbodies and adjustment sheet force panting to make schematic diagram;
Fig. 4 is that the time dependent oscillogram of charge flow rate in process " is forced and breathe heavily " to compressor;
Fig. 5 is that the time dependent oscillogram of pressure ratio in process " is forced and breathe heavily " to compressor;
Fig. 6 is that the time dependent oscillogram of process medium speed " is forced and breathe heavily " to compressor;
Fig. 7 is that compressor " forces and breathe heavily " front and back bearings in process to vibrate time dependent oscillogram;
Fig. 8 is pumping point test data and the stall margin of θ=66, stator blade angle °;
Fig. 9 be state θ=66, stator blade angle ° stall margin application and example is set;
1 is main compressor, 2 is stationary blade regulating mechanisms, 3 is drive motor, 4 is anti-surge valve and anti-asthma bypass, 5 is wind-tunnel stagnation pressure regulating systems, 6 is test sections, 7 is two venturi centerbody and adjustment sheets, 8 is hole walls, 9 is adjustment sheets, 10 is centerbodies, 11 is compressor charge volume flows, 12 is anti-surge valve valve opening moments, 13 is compressor pressure ratios, 14 is compressor rotary speeds, 15 is the shaft vibrations of compressor air inlet side, 16 is the vibrations of compressor air-discharging side shaft, 17 is compressor pumping point test datas when 66 °, 1000r/min stator blade angle, 18 is compressor pumping point test datas when 66 °, 1500r/min stator blade angle, 19 is compressor pumping point test datas when 66 °, 2000r/min stator blade angle, 20 is compressor pumping point test datas when 66 °, 2500r/min stator blade angle, 21 is compressor pumping point test datas when 66 °, 3000r/min stator blade angle, 22 is compressor pumping point test datas when 66 °, 3300r/min stator blade angle, 23 is compressor pumping point test datas when 66 °, 3600r/min stator blade angle, 24 stall margins when being 66 °, compressor stator blade angles, A is wind-tunnel stagnation pressure, stagnation temperature measuring point, B is wind-tunnel hydrostatic measuring point, C is compressor inlet pressure, inlet temperature measuring point, D is outlet pressure measuring point.
Embodiment
All features disclosed in this specification, or the step in disclosed all methods or process, except mutually exclusive feature and/or step, all can combine by any way.
As shown in Fig. 1, it is system functional block diagram of the present utility model.Upper monitoring interface by the both-way communication with PLC control system, realize regulating subtense angle, compressor rotary speed to regulate subtense angle to pressure measurement subtense angle, stator blade, force breathe heavily subtense angle, surge judges subtense angle, fast de-ly breathe heavily subtense angle, stagnation pressure regulates subtense angle to relate to the monitor and forecast of equipment.Upper monitoring interface and background program thereof, real time record also shows the parameters of stall margin needs.
Wherein, supervisory system and PLC control system adopt the communication mode based on Ethernet ICP/IP protocol, realize the bi-directional of data, control signal.Described PLC control system is by digital I/O module, Simulation with I/O module or communication module, realize with the connection of each subsystem hardware, sensor and controller with communicate, eventually through program module corresponding in PLC control system, reach regulate subtense angle, compressor rotary speed to regulate subtense angle to described pressure measurement subtense angle, stator blade, force breathe heavily subtense angle, surge judges subtense angle, fast de-ly breathe heavily subtense angle, equipment that stagnation pressure regulates seven systems such as subtense angle to relate to carries out DATA REASONING, status monitoring, state modulator.
In the monitoring interface of supervisory system, be provided with stall margin measure needed for wind-tunnel/compressor principal states parameter display interface (compressor import/export pressure, compressor import/export temperature, compressor charge flow rate Q, pressure ratio ε, compressor rotary speed, wind-tunnel stagnation temperature/stagnation pressure/static pressure, anti-asthma valve valve position, two venturi centerbodies and adjustment sheet position), controling parameters interface (compressor rotary speed, static blade angle, anti-asthma valve valve position, wind-tunnel stagnation pressure, two venturi centerbodies and adjustment sheet arrange sub-picture) is set; Real time record compressor import/export, upper monitoring interface pressure, compressor import/export temperature, compressor charge flow rate Q, pressure ratio ε, compressor rotary speed, wind-tunnel stagnation temperature/stagnation pressure/static pressure/, the parameter such as anti-asthma valve valve position, determine for surge data analysis and stall margin.
Described pressure-measuring system, comprise the some total-pressure probes, the total temperature probe that are arranged on wind-tunnel stable section, be arranged on some static pressure transducers of test chamber, be arranged on some static pressure transducers, temperature transducer that compressor is imported and exported, PLC control system, by the Real-time Collection to the sensor data, calculates suction port of compressor flow Q and pressure ratio ε according to correlation formula.
Described compressor rotary speed regulates subtense angle, adopts high voltage AC frequency conversion device to drive asynchronous motor to carry out speed governing.PLC control system, by communicating and hardwire with the modbus of frequency variator, realizes the speed governing of compressor 1500r/min ~ 3600 r/min operating rotational speed range.
Described forcing breathes heavily subtense angle, when adopting wind tunnel operation to the larger motion (anti-surge valve and two venturi profile mechanisms) of suction port of compressor flow effect as Bi Chuan mechanism.PLC program is arranged and forces and breathe heavily module, carry out anti-surge valve valve position and two venturi profile mechanisms (comprising two venturi centerbodies and three sections of adjustment sheets) aperture controls as shown in Figure 3.Tunable center body and three sections of adjustment sheet mechanisms all adopt AC servo machinery driving, regulated reduce or increase two venturi cross-sectional flow area by profile, thus reduce or increase compressor charge flow rate.
Described surge judges subtense angle, at the external precision pressure gauge in compressor inlet and outlet pressure-measuring-point place, arranges camera at the scene, and monitoring chamber giant-screen shows gauge hand situation of change in real time.If force the pointer sudden change backswing of precision pressure gauge in the process of breathing heavily, and big ups and downs, be then judged to be that surge occurs.The method is under continuous high-speed wind-tunnel operating mode, more more accurate, safer than vibratory drilling method (or fluctuation of speed method) than conventional noise method.
Described taking off fast breathes heavily subtense angle, adopts the actuator that the anti-surge bypass on wind-tunnel loop and anti-surge valve are done as quick de-panting.Arrange at monitoring chamber and fast de-ly breathe heavily button, this button is connected to described PLC control system by hardwire, PLC program arranges de-button signal and the anti-surge valve breathed heavily fast and opens function soon and interlock.When tester judges that subtense angle is judged to be that surge occurs according to described surge, manually press that fast de-to breathe heavily on button or upper interface virtual drives button soon, after PLC control system Received signal strength, control relay cuts off the power supply of the fast open electromagnetic valve of anti-surge valve, the air of discharging fast as power in anti-surge valve opened by solenoid valve, anti-surge valve is standard-sized sheet immediately, fast away from surge area.
Described stagnation pressure regulates subtense angle, adopts tunnel pressure regulating system (comprising wind-tunnel outlet valve, wind-tunnel suction valve, vacuum pumping device, stagnation pressure adjusting color controls) as actuating device.PLC program arranges total voltage regulation module, carry out the reception of upper operation interface stagnation pressure regulating command, the sending and status monitoring of control command, realize the stable regulation of 20kPa ~ 250 kPa scope stagnation pressure, both inlet pressure fluctuation had been solved to the accurate sex problem of mensuration, expand again the measurement function of multiple pressure working condition, improve the researching value of Analytical system.
In the utility model, by upper monitoring interface and PLC, the hardware device parameter measured is carried out to the direct control of centralization for stall margin.
In the utility model, high voltage converter speed governing, by PLC and high voltage converter both-way communication, is taked in upper monitoring interface, and the highi degree of accuracy of the given fast and target ladder rotating speed of realize target ladder rotating speed regulates.
In the utility model, adopt tunnel pressure to regulate subtense angle, carry out under keeping stall margin to be determined at stable specific stagnation pressure.
In the utility model, adopt sound alarm, after running operating point crosses theoretical alarming line, automatically send alarm sound forcing in the process of breathing heavily, remind surge to measure personnel and note, reduce to force the ladder speed of breathing heavily, ensure safety.
In the utility model, be provided with and in kind de-ly fast breathe heavily button and upper monitoring interface is virtual de-ly fast breathes heavily button.
As shown in Figure 2, axial flow compressor is arranged in continuous high-speed wind-tunnel major loop, and during wind-tunnel normal assays, compressor stator blade angle is fixed, and is regulated realize Mach number coarse adjustment by compressor rotary speed, realizes Mach number accurate adjustment by two throat area changes.
When whole system works, after stall margin measures and starts, operator pass through monitoring interface, sub-interface is set at controling parameters and inputs target static blade angle, goal pressure successively, utilize stator blade to regulate subtense angle, wind-tunnel stagnation pressure to regulate subtense angle respectively static blade angle and wind-tunnel stagnation pressure to be adjusted to desired value, and keep in mensuration process.Then input rotating speed of target in interface is set at controling parameters, compressor rotary speed is utilized to regulate subtense angle, take from the slow-speed of revolution, after each ladder stabilization of speed, arrange interface by controling parameters again to close anti-surge valve gradually, regulate the mode of two venturi centerbodies and adjustment sheet to carry out forcing breathing heavily, judge that subtense angle is confirmed whether surge by surge, generation surge is then pressed immediately to take off fast and is breathed heavily button, compressor departs from surge area fast, enters safe work state.Now volume flow Q and operating point (flow is minimum, pressure ratio is the highest) corresponding to pressure ratio ε are the pumping point of compressor at current rotating speed ladder.Two venturi centerbodies and adjustment sheet force panting to see Fig. 3 as schematic diagram.Otherwise, using stalling point or the operating point that flow is minimum, pressure ratio is maximum as " substituting " pumping point.After obtaining pumping point corresponding to current rotating speed, raising speed is to next rotating speed ladder repeat to force the process of breathing heavily.The omnidistance real time record stall margin of upper monitoring interface and background program measures the data of process, in test or after test, by can be completed the analysis of archive data or the data of all pumping points.
Certain wind tunnel compressor is forced at 3000r/min and is breathed heavily process major parameter history curve and see Fig. 4, Fig. 5, Fig. 6, Fig. 7.Finally, after the pumping point of all rotating speed ladders obtained is connected into line, it is namely the compressor surge border under this wind-tunnel stagnation pressure and compressor target stator blade angle in full operating rotational speed range.Fig. 8 is seen in pumping point test data and the stall margin of θ=66, stator blade angle °, stall margin application and arrange example and see Fig. 9.
Choosing method at above-mentioned " substituting " pumping point: in " force and breathe heavily " process, surge, first stall (stall criterion is that compressor pressure ratio reduces suddenly) surge afterwards, stall not surge, neither stall also not surge four kinds of results may be produced, select stalling point or flow is minimum, pressure ratio is maximum operating point as " substituting " pumping point for rear three kinds of situations, the a series of pumping point data recorded like this are more reliable, complete, should use more scientific and reasonable.
Decision method in above-mentioned compressor surge: in view of following reason because low-frequency noise will produce before surge occurs, real-time measurement processing difficulty, differentiate the main experience and the subjective sensation that rely on tester, very easily cause judgement too early for opportunity, surge boundary line cannot be gone out by Accurate Determining; Unit vibration increases or the fluctuation of speed increases, be surge aggravation or the degree of depth surge time reaction, namely unit operation operating point crosses surge boundary line, requires tester to process very fast, careless slightly, very easily damages unit and wind-tunnel facilities.Surge judges that subtense angle adopts and installs precision pressure gauge in compressor inlet and outlet side, observes the manometric method of the beat of pointer, carries out compressor surge judgement.
The utility model is not limited to aforesaid embodiment.The utility model expands to any new feature of disclosing in this manual or any combination newly, and the step of the arbitrary new method disclosed or process or any combination newly.
Claims (7)
1. an axial flow compressor stall margin Analytical system, is characterized in that this system is made up of supervisory system and PLC control system, by the both-way communication of Ethernet ICP/IP protocol between described PLC control system and supervisory system; Described PLC control system comprises PLC, pressure measurement subtense angle, stator blade regulate subtense angle, compressor rotary speed to regulate subtense angle, force breathe heavily subtense angle, surge judges subtense angle, fast de-ly breathe heavily subtense angle, stagnation pressure regulates subtense angle, each subtense angle is communicated with PLC by datawire; Described supervisory system comprise based on WinCC configuration software monitoring interface and fast de-ly breathe heavily button, de-ly breathe heavily button and be connected with PLC control system.
2. a kind of axial flow compressor stall margin according to claim 1 Analytical system, it is characterized in that described pressure measurement subtense angle comprises the some total-pressure probes, the total temperature probe that are arranged on wind-tunnel stable section and is arranged on some static pressure transducers of test chamber, and be arranged on some static pressure transducers, temperature transducer that compressor imports and exports.
3. a kind of axial flow compressor stall margin according to claim 1 Analytical system, it is characterized in that described compressor rotary speed regulates subtense angle to adopt high voltage AC frequency conversion device to drive asynchronous motor, PLC is by communicating and hardwire with the modbus of frequency variator.
4. a kind of axial flow compressor stall margin according to claim 1 Analytical system, force described in it is characterized in that and breathe heavily subtense angle and adopt anti-surge valve and two venturi profile mechanisms as Bi Chuan mechanism, described two venturi profile mechanisms comprise two venturi centerbodies and three sections of adjustment sheets.
5. a kind of axial flow compressor stall margin according to claim 4 Analytical system, is characterized in that described two venturi centerbodies and three sections of adjustment sheets are regulated by profile and reduces or increase two venturi cross-sectional flow area.
6. a kind of axial flow compressor stall margin according to claim 1 Analytical system, it is characterized in that described taking off fast breathes heavily subtense angle, adopt the anti-surge bypass on wind-tunnel loop and anti-surge valve as the actuator taking off panting work fast, described anti-surge valve is directly breathed heavily button be connected with de-, by take off breathe heavily fingertip control anti-surge valve open function soon.
7. a kind of axial flow compressor stall margin Analytical system according to claim 1 or 6, it is characterized in that described de-button of breathing heavily is breathed heavily button by PLC in PLC control system be connected with de-, monitoring interface arranges virtual taking off and breathes heavily button and anti-surge valve and open function soon and interlock.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104728151A (en) * | 2015-04-09 | 2015-06-24 | 中国空气动力研究与发展中心高速空气动力研究所 | Axial flow compressor surge boundary measurement system |
| CN109492245A (en) * | 2018-09-17 | 2019-03-19 | 江阴利港发电股份有限公司 | The appraisal procedure of axial flow blower surge security boundary based on mixed model |
-
2015
- 2015-04-09 CN CN201520208560.6U patent/CN204553304U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104728151A (en) * | 2015-04-09 | 2015-06-24 | 中国空气动力研究与发展中心高速空气动力研究所 | Axial flow compressor surge boundary measurement system |
| CN109492245A (en) * | 2018-09-17 | 2019-03-19 | 江阴利港发电股份有限公司 | The appraisal procedure of axial flow blower surge security boundary based on mixed model |
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