Development of a Simulation Method of Surge Transient Flow Phenomena in a Multistage Axial Flow Compressor and Duct System

Yamaguchi, Nobuyuki

doi:10.5293/ijfms.2013.6.4.189

Cited by 11 publications

(6 citation statements)

References 15 publications

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“…The simulation code, SRGTRAN, the details of which can be found in Yamaguchi [12], conducts analyses in spacetime coordinate (x, t). The compressor flow-path is made up of a series of control volumes corresponding to respective stages in which equations of conservation of mass, momentum and energy are solved by the two-stage Lax-Wendroff method.…”

Section: Basic Information On the Present Analyses 2-1 Analysis Procementioning

confidence: 99%

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A Study on the Fundamental Surge Frequencies in Multi-Stage Axial Flow Compressor Systems

Yamaguchi¹

2014

International Journal of Fluid Machinery and Systems

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Surge phenomena in multi-stage axial flow compressors were studied with attention to the frequency behaviors. A new parameter "volume-modified reduced surge frequency" was introduced, which took into consideration the essential surge process, i.e., emptying and filling of the working gas in the delivery plenum. The behaviors of the relative surge frequencies at the stall stagnation boundaries, compared with the corresponding duct resonance frequencies, have demonstrated the existence of two types of surges; i.e., a near-resonant surge and a subharmonic surge. The former, which has fundamentally a near-resonance frequency, occurs predominantly at the stall stagnation boundary for the short -and-fat plenum delivery flow-path and the long-and-narrow delivery duct flow-path, and possibly in the intermediate conditions. The latter, which has a subharmonic frequency of the fundamental near-resonant one and occurs mainly in the inter-mediate zone, is considered to be caused by the reduced frequency restricted to a limited range. In relation with those dimensionless frequencies at the stall stagnation boundary, the surge frequency behaviors in more general situations away from the boundaries could be estimated, though very roughly.

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Section: Basic Information On the Present Analyses 2-1 Analysis Procementioning

confidence: 99%

“…For the analyses, a surge transient simulation code "SRGTRAN "of own coding (Yamaguchi [12]) was employed.…”

Section: Introductionmentioning

confidence: 99%

A Study on the Fundamental Surge Frequencies in Multi-Stage Axial Flow Compressor Systems

Yamaguchi¹

2014

International Journal of Fluid Machinery and Systems

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“…The simulation code, SRGTRAN, the details of which can be found in Yamaguchi [1], conducts analyses in space-time coordinate (x, t). The compressor flow-path is made up of a series of control volumes corresponding to respective stages in which equations of conservation of mass, momentum and energy are solved by the twostage Lax-Wendroff method.…”

Section: Analysis Procedures (Srgtran)mentioning

confidence: 99%

“…The following relation is assumed to describe approximately the motion of the flow through the valve passage having a valve opening area Av and an equivalent length ΔLv (Yamaguchi [1,3]). …”

Section: Analysis Procedures (Srgtran)mentioning

confidence: 99%

“…In the situation, it will be important to clarify the whole picture of the phenomena on the basis of the few pieces of experimental information supported by analytical ones gained by some reliable simulation methods using appropriate data on stage characteristics and flow-path properties, and operating conditions, etc. For the purpose, the author has been developing a simulation code about surge transient phenomena (SRGTRAN, Yamaguchi [1]). …”

Section: Introductionmentioning

confidence: 99%

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Surge Phenomena Analytically Predicted in a Multi-stage Axial Flow Compressor System in the Reduced-Speed Zone

Yamaguchi

2014

International Journal of Fluid Machinery and Systems

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Surge phenomena in the zone of reduced speeds in a system of a nine-stage axial flow compressor coupled with ducts were studied analytically by use of a surge transient simulation code. Main results are as follows. (1) Expansion of apparently stable, non-surge working area of the pressure vs. flow field beyond the initial stage-stall line was predicted by the code in the lower speed region. The area proved analytically to be caused by significantly mismatched stage-working conditions, particularly with the front stages deep in the rotating stall branch of the characteristics, as was already known in situ and in steady-state calculations also. (2) Surge frequencies were found to increase for decreasing compressor speeds as far as the particular compressor system was concerned. (3) The tendency was found to be explained by a newly introduced volumemodified reduced surge frequency. It suggests that the surge frequency is related intimately with the process of emptying and filling of air into the delivery volume. (4) The upstream range of movement of the fluid mass having once passed through the compressor in surge was found to reduce toward the lower speeds, which could have caused additionally the increase in surge frequency. (5) The concept of the volume-modified reduced surge frequency was able to explain, though qualitatively at present, the behaviors of the area-pressure ratio parameter for the stall stagnation boundary proposed earlier by the author.

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Analytical Surge Behaviors in Systems of a Single-stage Axial Flow Compressor and Flow-paths

Yamaguchi

2016

International Journal of Fluid Machinery and Systems

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Behaviors of surges appearing near the stall stagnation boundaries in various fashions in systems of a single-stage compressor and flow-path systems were studied analytically and were tried to put to order. Deep surges, which enclose the stall point in the pressure-mass flow plane, tend to have either near-resonant surge frequencies or subharmonic ones. The subharmonic surge is a multiple-loop one containing, for example, in a (1/2) subharmonic one, a deep surge loop and a mild surge loop, the latter of which does not enclose the stall point, staying only within the stalled zone. Both loops have nearly equal time periods, respectively, resulting in a (1/2) subharmonic surge frequency as a whole. The subharmonic surges are found to appear in a narrow zone neighboring the stall stagnation boundary. In other words, they tend to appear in the final stage of the stall stagnation process.It should be emphasized further that the stall stagnation initiates fundamentally at the situation where a volume-modified reduced resonant-surge frequency becomes coincident with that for the stagnation boundary conditions, where the reduced frequency is defined by the acoustical resonance frequency in the flow-path system, the delivery flow-path length and the compressor tip speed, modified by the sectional area ratio and the effect of the stalling pressure ratio. The real surge frequency turns from the resonant frequency to either near-resonant one or subharmonic one, and finally to stagnation condition, for the large-amplitude conditions, caused by the non-linear self-excitation mechanism of the surge./

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Development of a Simulation Method of Surge Transient Flow Phenomena in a Multistage Axial Flow Compressor and Duct System

Cited by 11 publications

References 15 publications

A Study on the Fundamental Surge Frequencies in Multi-Stage Axial Flow Compressor Systems

A Study on the Fundamental Surge Frequencies in Multi-Stage Axial Flow Compressor Systems

Surge Phenomena Analytically Predicted in a Multi-stage Axial Flow Compressor System in the Reduced-Speed Zone

Analytical Surge Behaviors in Systems of a Single-stage Axial Flow Compressor and Flow-paths

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