CN107202028B - A kind of turbocharger centrifugal compressor surge recognition methods - Google Patents
A kind of turbocharger centrifugal compressor surge recognition methods Download PDFInfo
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- CN107202028B CN107202028B CN201710405073.2A CN201710405073A CN107202028B CN 107202028 B CN107202028 B CN 107202028B CN 201710405073 A CN201710405073 A CN 201710405073A CN 107202028 B CN107202028 B CN 107202028B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
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Abstract
A kind of turbocharger centrifugal compressor surge recognition methods disclosed by the invention, the method for being related to identifying booster centrifugal compressor surge based on pressure oscillation quantity in statistical time window belong to fluid machines condition monitoring and diagnostic technology field.The present invention includes the following steps: step 1: surge signal acquisition；Step 2: design matched filter filters out the noise being added on surge signal, determines traveling time window length Δ T；Step 3: to the filtered signal of matched filter is passed through, counting signal fluctuation quantity in traveling time window length Δ T；Step 4: according to signal fluctuation amount Δ x in the traveling time window length Δ T counted, determining decision threshold Δ X0；Step 5: real time discriminating surge.The present invention provides one kind for surge automatic identifying method in supercharger air compressor performance test, can be avoided by artificial judgment and stall margin is caused to measure inconsistent problem, have the advantages that calculation amount is small, accuracy is high, be easily achieved.
Description
Technical field
The invention belongs to fluid machines condition monitoring and diagnostic technology fields, and in particular to one kind is based on statistical time
The method that compressor out temperature or pressure signal fluctuate quantity to identify booster centrifugal compressor surge in window.
Background technique
Supercharging technology is a kind of effective measures for improving engine performance, and the power that can significantly increase engine is close
Degree, improves its economy, and be conducive to the improvement of emission performance.It is big due to engine operating condition in engine working process
Range, when compressor flow reduces to a certain extent, surge phenomenon can occur for compressor, can go out in pressure charging system at this time
Show period low frequency significantly gas oscillation phenomenon so that booster can not work normally.Meanwhile vibration caused by surge may
The bearing and sealing system for destroying booster, to influence the normal work of engine.
To guarantee that booster can reliably be run on engine with supercharger, before booster and Engine Matching, need
Turbocharger air compressor performance curve, that is, the MAP chart of compressor are measured by test.Fig. 1 is certain type turbocharger
Capability of Compressor curve graph.As shown in Figure 1, the Capability of Compressor curve post that test obtains shows compressor surge line, work as pressure
When entering surge area surge phenomenon will occur for mechanism of qi running operating point.In turbocharger and Engine Matching, to ensure to send out
Motivation and the matching running operating point of booster are all contained in compressor accidental conditions point, are usually calmed the anger in test
There are certain nargin on the basis of machine surge line, delimit an anti-surge line, under all operating conditions of engine with supercharger, pressurization
The running operating point of device compressor is all in anti-surge line, to guarantee the reliability service of engine with supercharger.Surge line is booster
One line of demarcation of compressor accidental conditions and abnormal operation condition, accurate measurement is safe to booster is guaranteed, high
Effect operation has great importance.If measurement inaccuracy will reduce compressor so that the setting of anti-surge curve is overly conservative
Normal operating zone, particularly, compressor surge line is in compressor high pressure ratio, high efficiency region so that Capability of Compressor without
Method gives full play to；On the other hand, if the anti-surge curve of setting is be easy to cause in the operation of engine with supercharger close to surge line
The surge of compressor, to influence the performance of engine with supercharger.
Turbocharger air compressor performance test is mostly by being accomplished manually, and tester completes pair according to experience
The judgement of compressor surge, the foundation commonly used to judgement include compressor inlet and outlet pressure, the fluctuation of temperature, booster sending
Sound change.Since everyone judges that the standard of surge is different, stall margin in test result finally will affect
It determines, so that the stall margin that inaccurate or same booster different tests personnel for causing anti-surge line to be arranged measure is deposited
In difference.
Summary of the invention
To solve in turbocharger air compressor performance test, surge causes stall margin to measure by artificial judgment
Inconsistent problem, a kind of turbocharger centrifugal compressor surge recognition methods disclosed by the invention, the technology to be solved are asked
Topic is to provide one kind for surge automatic identifying method in supercharger air compressor performance test, can be avoided by artificial judgment
And stall margin is caused to measure inconsistent problem, have the advantages that calculation amount is small, accuracy is high, be easily achieved.
Technical solution of the present invention implementation method is as follows.
A kind of turbocharger centrifugal compressor surge recognition methods disclosed by the invention, includes the following steps:
Step 1: surge signal acquisition；
Installation on pipeline is imported and exported or imported and exported in compressor be used for dynamic temperature or dynamic pressure measurement sensor, acquisition
The dynamic pressure or dynamic temperature signal being installed on turbocharger air compressor inlet and outlet or inlet and outlet pipeline.
Step 2: design matched filter filters out the noise being added on surge signal, determines traveling time window length Δ T；
Filter coefficient vector is obtained according to collected turbocharger air compressor surge signal waveform, that is, completes to filter out
The matched filter for the noise being added on surge signal designs；According to the sample frequency of filter coefficient vector dimension and setting
Determine traveling time window length Δ T.
Step 3: to by the filtered signal of matched filter in step 2, counting signal in traveling time window length Δ T
Fluctuate quantity.
To passing through, the filtered signal of matched filter in step 2 successively carries out first difference, Sign function is handled, again
Calculus of differences carries out statistical disposition to all data points in the traveling time window length Δ T after calculus of differences again, counts
Signal fluctuation amount Δ x in traveling time window length Δ T.
Step 4: signal fluctuation amount Δ x in the traveling time window length Δ T counted according to step 3 determines decision threshold
It is worth Δ X0；
Step 5: real time discriminating surge；
The dynamic temperature or dynamic pressure measurement sensor signal that real-time acquisition step 1 is installed, are designed using step 2 and are matched
Filter filters out the noise being added on surge signal, and according to signal fluctuation number in step 3 statistics traveling time window length Δ T
Amount, and step 3 is counted into the decision threshold Δ X that signal fluctuation amount Δ x and step 4 determine in traveling time window length Δ T0It is real
When compare, upon displacement between in window length Δ T signal fluctuation amount Δ x be less than decision threshold Δ X0When, judge that surge occurs, i.e.,
Realize real time discriminating surge.
Also step 6: a kind of turbocharger centrifugal compressor surge recognition methods, in turbocharger air compressor
Performance test field and turbocharger air compressor surge online recognition field have practical value and application prospect.Such as: it answers
For the on-line monitoring of turbocharger air compressor surge in turbocharged engine, taken in time when surge occurs for compressor
Measure, to guarantee the reliability of operation of engine with supercharger.
The sample frequency of the step 1 acquisition compressor inlet and outlet signal is preferably 80~100Hz.
The step 2 design matched filter filters out the noise being added on surge signal, determines traveling time window length
Δ T, the specific implementation steps are as follows:
Step 2.1: design matched filter filters out the noise being added on surge signal.
The compressor surge signal measured according to step 1 intercepts a complete surge Wave data, defines one completely
Surge Wave data by m groups of samples at, then constitute a m dimension signal phasor
Wherein: s (0), s (1) ..., s (m-1) is respectively the m sampled point that a complete surge signal waveform is included
Value.
Choose matched filter coefficient vectorCoefficient k is ratio
Coefficient, proportionality coefficient k choose according to the big freedom in minor affairs of actual measurement surge signal, i.e. complete design matched filter, and utilize matching
Filter filters out the noise being added on surge signal.
Step 2.2: traveling time window length Δ T is determined according to the sample frequency of filter coefficient vector dimension and setting,
Traveling time window length Δ T is determined according to the following formula:
Wherein, f is signal sampling frequencies, the number of sampling points that m includes by a complete surge Wave data.
Calculus of differences in the step 3, the calculus of differences method of calculus of differences is defined as follows again:
Defining value of the discrete signal x at the k moment is x (k), and the value at k+1 moment is x (k+1), first-order difference signal y's
Calculation method are as follows: y (k)=x (k+1)-x (k).
The step 4 determines decision threshold Δ X0It is preferred that following method is realized:
Before moment occurs for surge, the average value of undulating value in m-1 time window length is takenAfter pumping point, m-1 is taken
Fluctuation number average in a time window lengthGiven threshold takes the two average value, that is, determines decision threshold Δ X0。
The utility model has the advantages that
1, stall margin is determined in turbocharger air compressor performance test, surge is existed by artificial judgment
Inconsistent problem, a kind of turbocharger centrifugal compressor surge recognition methods disclosed by the invention can substitute turbine increasing
Asthma, the consistency of guarantee test test result are manually sentenced in the test of depressor Capability of Compressor.
2, statistical fluctuation quantity in prior art, generallys use ranking method, bubbling method seeks extreme value, is recycled and is sentenced
Disconnected operation carries out FFT operation, a kind of turbocharger centrifugal compressor asthma disclosed by the invention using frequency spectrum analysis method
It shakes recognition methods, by simply carrying out first difference, the processing of Sign function, calculus of differences again, fluctuation quantity can be counted,
Therefore, calculation amount is small.
3, a kind of turbocharger centrifugal compressor surge recognition methods disclosed by the invention, filters out folded by matched filtering
The noise being added on surge signal, surge signal and normal signal fluctuation quantitative comparison are obvious, and therefore, accuracy is high.
4, a kind of turbocharger centrifugal compressor surge recognition methods disclosed by the invention, in turbocharger air compressor
Performance test field has biggish practical value and application prospect, such as: it can be applied to turbine in turbocharged engine and increase
The on-line monitoring of depressor compressor surge takes timely measure when surge occurs for compressor, to guarantee the fortune of engine with supercharger
Capable reliability.
Detailed description of the invention
Fig. 1 is certain type turbocharger air compressor performance curve in background technique.
Fig. 2 is surge recognizer flow chart disclosed by the invention；
Fig. 3 is sensor mounting location schematic diagram；
Wherein: 1 is turbocharger air compressor, and 2 be turbocharger turbine, and 3 export for turbocharger air compressor, 4
It is the first installation site of blower outlet measurement sensor for turbocharger air compressor outlet connecting pipe road, 5,6 be compressor
The second installation site of measurement sensor is exported, 7 be turbocharger air compressor import, and 8 connect for turbocharger air compressor import
Adapter tube road, 9 be the first installation site of compressor inlet measurement sensor, and 10 be the second installation position of compressor inlet measurement sensor
It sets.
Fig. 4 is turbocharger surge signal graph；
Fig. 5 is turbocharger surge signal waveforms；
Fig. 6 is signal fluctuation quantity statistics result after the matched filtering of turbocharger surge signal and second differnce, in which: figure
6 (a) be after the matched filtering of turbocharger surge signal as a result, Fig. 6 (b) is signal fluctuation quantity statistics result after second differnce；
Fig. 7 is that surge differentiates result figure.
Specific embodiment
In order to enable those skilled in the art to better understand the solution of the present invention, with reference to the accompanying drawing and specific implementation method
The content of present invention is described in further detail.
Embodiment 1:
A kind of turbocharger centrifugal compressor surge recognition methods disclosed in the present embodiment, flow chart is as shown in Fig. 2, packet
Include following steps:
Step 1: surge signal acquisition；
It imports and exports or imports and exports on pipeline in JP90 turbocharger air compressor and dynamic pressure transducer is installed, for measuring
The pressure of compressor disengaging gas；As shown in figure 3, dynamic pressure transducer installation site preferably following four kinds of installation sites:
The first mounting means: the compressor inlet measurement sensor being installed on turbocharger air compressor inlet connecting branch road 8
One installation site；Second of mounting means: the compressor inlet measurement sensor being installed in turbocharger air compressor import 7
Second installation site 10；The third mounting means: it is installed to blower outlet on turbocharger air compressor outlet connecting pipe road 4
The first installation site of measurement sensor 5；4th kind of mounting means: it is installed to compressor in turbocharger air compressor outlet 3 and goes out
The second installation site of mouth measurement sensor 6.This example uses the third mounting means, and mounting distance L2 is less than blower outlet pipe
Dynamic pressure transducer is mounted on blower outlet pipeline away from blower outlet by 3 times of 225mm of diameter d2=75mm, this example
Distance is 200mm.
Dynamic pressure transducer data, sample frequency f=100Hz are acquired, operating operation test bench control system adjusts turbine and increases
Depressor revolving speed adjusts supercharger air compressor operating status to surging condition, obtains accidental conditions and asthma to 30000r/min
Compressor outlet pressure signal under operating condition of shaking, JP90 turbocharger nominal situation and surging condition signal graph are as shown in Figure 4.Figure
In 4, at 4 seconds, turbocharger air compressor enters surging condition by nominal situation.
Step 2: design matched filter filters out the noise being added on surge signal, determines traveling time window length Δ T.
Step 2.1: design matched filter filters out the noise being added on surge signal.
In the surging condition signal that step 1 obtains, one of them complete surge waveform, intercepted surge waveform are intercepted
As shown in figure 5, being made of 11 data points Filter coefficient k=1 is taken, matched filter coefficient vector is obtained It will step
Nominal situation obtained in rapid 1 and surging condition signal filter out the asthma that is added to after the matched filter filtering designed through step 2
The noise to shake on signal, after filtering shown in result such as Fig. 6 (a).
Step 2.2: traveling time window length Δ T is determined according to the sample frequency of filter coefficient vector dimension and setting.
According to step 2.2 provide traveling time window length Δ T calculation formula,
M=11, f=100Hz, it is 0.22~0.33 second that traveling time window degree length value range, which is calculated, chooses Δ T
=0.3 second.
Step 3: to by the filtered signal of matched filter in step 2, counting signal in traveling time window length Δ T
Fluctuate quantity.
After matched filter filtering of the collected dynamic pressure transducer signal of step 2 through designing, a scale is carried out
Partite transport is calculated, and after Sign functional operation, carries out calculus of differences again, after operation result is taken absolute value in 0.3 second mobile
Between summation in window, shown in calculated result such as Fig. 6 (b).
According to Fig. 6 (b), since at 4 seconds, surge waveform signal includes 11 sampled points, i.e. m=11, surge hair for surge
Before the raw moment, m-1 time window Δ T length, i.e., in 3 seconds ((11-1) * 0.3=3 seconds), fluctuation number average is 126, i.e.,After moment occurs for surge, m-1 time window Δ T length, i.e., in 3 seconds ((11-1) * 0.3=3 seconds), fluctuation number
Measuring average value is 36, i.e.,
Step 4: determining decision threshold Δ X0；
According to surge threshold calculations formula,
Step 3 is obtainedIt substitutes into formula and obtains decision threshold Δ X0=81.
Step 5: real time discriminating surge；
The dynamic pressure measurement sensor signal that real-time acquisition step 1 is installed is filtered out using step 2 design matched filter
The noise being added on surge signal, and according to signal fluctuation quantity in step 3 statistics traveling time window length Δ T, and will step
The decision threshold Δ X that signal fluctuation amount Δ x and step 4 determine in rapid 3 statistics traveling time window length Δ T0Compare in real time, when
Signal fluctuation amount Δ x is less than decision threshold Δ X in traveling time window length Δ T0When=81, judges that surge occurs, that is, realize
Real time discriminating surge.Surge differentiates that result is as shown in Figure 7.
Also step 6: the turbocharger centrifugal compressor surge recognition methods is applied in turbocharged engine
The online recognition of turbocharger air compressor surge can judge the generation of surge after compressor occurs 0.5 second.
While characterized as a kind of specific embodiment of the content of present invention, but those skilled in the art it is contemplated that
Do not change the modifications and variations of the embodiment of substantive summary of the invention more, it is all to be formed using equivalent substitution or equivalent transformation
Technical solution, should all fall within the scope of protection required by the present invention.It is understood, therefore, that appended claims are intended to
Cover these modifications and variations identical with essentiality content of the present invention in itself.
Claims (6)
1. a kind of turbocharger centrifugal compressor surge recognition methods, it is characterised in that: include the following steps,
Step 1: surge signal acquisition；
It imports and exports or imports and exports in compressor and dynamic temperature or dynamic pressure measurement sensor are installed on pipeline, acquisition is installed to whirlpool
Take turns the dynamic pressure or dynamic temperature signal on booster centrifugal compressor inlet and outlet or inlet and outlet pipeline；
Step 2: design matched filter filters out the noise being added on surge signal, determines traveling time window length Δ T；
Filter coefficient vector is obtained according to collected turbocharger centrifugal compressor surge signal waveform, that is, completes to filter out
The matched filter for the noise being added on surge signal designs；According to the sample frequency of filter coefficient vector dimension and setting
Determine traveling time window length Δ T；
Step 3: to by the filtered signal of matched filter in step 2, counting signal fluctuation in traveling time window length Δ T
Quantity；
First difference, the processing of Sign function, again difference are successively carried out to by the filtered signal of matched filter in step 2
Operation carries out statistical disposition to all data points in the traveling time window length Δ T after calculus of differences again, counts movement
Signal fluctuation amount Δ x in time window length Δ T；
Step 4: signal fluctuation amount Δ x in the traveling time window length Δ T counted according to step 3 determines decision threshold Δ
X0；
Step 5: real time discriminating surge；
The dynamic temperature or dynamic pressure measurement sensor signal that real-time acquisition step 1 is installed, design matched filtering using step 2
Device filters out the noise being added on surge signal, and counts signal fluctuation quantity in traveling time window length Δ T according to step 3,
And step 3 is counted into the decision threshold Δ X that signal fluctuation amount Δ x and step 4 determine in traveling time window length Δ T0In real time
Compare, upon displacement between in window length Δ T signal fluctuation amount Δ x be less than decision threshold Δ X0When, judge that surge occurs, i.e., in fact
Existing real time discriminating surge.
2. a kind of turbocharger centrifugal compressor surge recognition methods as described in claim 1, it is characterised in that: further include
Step 6: a kind of turbocharger centrifugal compressor surge recognition methods can be applied to whirlpool in turbocharged engine
The on-line monitoring for taking turns the surge of booster centrifugal compressor takes timely measure when surge occurs for compressor, to guarantee pressurization hair
The reliability of operation of motivation.
3. a kind of turbocharger centrifugal compressor surge recognition methods as claimed in claim 1 or 2, it is characterised in that: institute
Stating step 2, the specific implementation steps are as follows,
Step 2.1: design matched filter filters out the noise being added on surge signal；
The compressor surge signal measured according to step 1 intercepts a complete surge Wave data, defines a complete asthma
Vibration wave graphic data is by m groups of samples at the signal phasor that then one m of composition is tieed up
Wherein: s (0), s (1) ..., s (m-1) is respectively the value for the m sampled point that a complete surge signal waveform is included；
Choose matched filter coefficient vectorCoefficient k is proportionality coefficient,
Proportionality coefficient k chooses according to the big freedom in minor affairs of actual measurement surge signal, i.e. complete design matched filter, and utilizes matched filter
Filter out the noise being added on surge signal；
Step 2.2: traveling time window length Δ T, i.e. root are determined according to the sample frequency of filter coefficient vector dimension and setting
Traveling time window length Δ T is determined according to following formula:
Wherein, f is signal sampling frequencies, the number of sampling points that m includes by a complete surge Wave data.
4. a kind of turbocharger centrifugal compressor surge recognition methods as claimed in claim 1 or 2, it is characterised in that: institute
State that first difference operation in step 3, the calculus of differences method of calculus of differences is defined as follows again,
Defining value of the discrete signal x at the k moment is x (k), and the value at k+1 moment is x (k+1), the calculating of first-order difference signal y
Method are as follows: y (k)=x (k+1)-x (k).
5. a kind of turbocharger centrifugal compressor surge recognition methods as claimed in claim 1 or 2, it is characterised in that: institute
The step 4 stated determines decision threshold Δ X0Following method is selected to realize,
Before moment occurs for surge, the average value of fluctuation quantity in m-1 time window length is takenAfter pumping point, m-1 are taken
Fluctuation number average in time window lengthGiven threshold takes the two average value, that is, determines decision threshold Δ X0
6. a kind of turbocharger centrifugal compressor surge recognition methods as claimed in claim 1 or 2, it is characterised in that: institute
The sample frequency for stating step 1 acquisition compressor inlet and outlet signal is selected as 80~100Hz.
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Families Citing this family (8)
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| CN108241346A (en) * | 2017-12-05 | 2018-07-03 | 北京智拓博科技有限公司 | Fluid machinery intelligent monitor system and its method |
| CN110657991B (en) * | 2018-06-29 | 2021-05-07 | 中国航发商用航空发动机有限责任公司 | Surge monitoring method and surge monitoring system of aircraft engine |
| CN110608187B (en) * | 2019-10-30 | 2024-08-06 | 江西理工大学 | Axial-flow compressor stall surge prediction device based on frequency characteristic change |
| CN110848166B (en) * | 2019-11-13 | 2021-05-07 | 西北工业大学 | Axial flow compressor surge frequency prediction method |
| CN110925233A (en) * | 2019-12-05 | 2020-03-27 | 中国航发四川燃气涡轮研究院 | Compressor surge fault diagnosis method based on acoustic signals |
| CN111828364B (en) * | 2020-07-23 | 2021-08-20 | 清华大学 | Surge detection method for centrifugal compressor |
| CN114962305B (en) * | 2021-02-25 | 2023-09-26 | 中国航发商用航空发动机有限责任公司 | Online detection method, device, system, equipment and medium for instability of gas compressor |
| CN113482960B (en) * | 2021-06-23 | 2022-08-30 | 中国航发沈阳发动机研究所 | Method for judging surge of aviation gas turbine engine |
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