Investigation of Blade Tip Interaction With Casing Treatment in a Transonic Compressor—Part I: Particle Image Velocimetry

Voges, Melanie; Schnell, Rainer; Willert, Christian; Mönig, Reinhard; Mûller, Martín; Zscherp, Carsten

doi:10.1115/1.4000489

Cited by 23 publications

(10 citation statements)

References 17 publications

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“…Numerous studies of casing treatment applied on transonic compressors have been carried out to identify the fundamental flow mechanisms and their influence on operating range enhancement as well as flow stabilization [12,[18][19][20][21]. A better understanding of the complex flow characteristics has been achieved through timeresolved simulation and accurate measurements such as fast response pressure transducer and PIV technique.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Tip Leakage Flow and Stage Matching with Casing Treatment in a Transonic Mixed-Flow Compressor

Zhu

Qiang

Huang

et al. 2013

Int. J. Turbo Jet-Engines

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The first stage of a transonic multi-stage mixedflow compressor is numerically studied with and without casing treatment. First, overall performance and behavior of the tip leakage flow are investigated in the compressor stage with a smooth casing. Performance problems emerge in terms of narrow operating range and mismatching between rotor and stator. By investigating the flow field near tip region in detail, remarkable low momentum regions are observed at front and rear portion of rotor passage near suction surface, which grow up and extend further upstream along with mass flow reduced to near stall point, which contributes to a narrow stall margin. Detailed analysis indicates that tip leakage vortex and two types of leakage flow with different flow behaviors are main causes of low momentum regions. Shock-leakage flow interaction and vortex breakdown play an important role in formation of these regions. To improve the flow field near the rotor tip and extend the stable operating range, a circumferential groove casing treatment is then adopted, starting from 10% and ending at 94% axial chord. As expected, the low momentum regions are largely diminished by the casing treatment and stall margin of the investigated compressor stage is effectively enhanced. Fluid from circumferential grooves is injected into blade passage near the suction surface and re-energizes the leakage flow, which makes mainly contribution to manipulation of tip leakage flow and stall margin improvement. Since the pressure difference across blade tip section has a great impact on effectiveness of circumferential grooves, the positions of shock wave and tip leakage flow as well as where the interaction takes place ought to be taken into account through the casing treatment design procedure.

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Section: Introductionmentioning

confidence: 99%

Investigation of Tip Leakage Flow and Stage Matching with Casing Treatment in a Transonic Mixed-Flow Compressor

Zhu

Qiang

Huang

et al. 2013

Int. J. Turbo Jet-Engines

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“…13,14 A mass of works focuses on influences on tip flow fields by suction/injection process. 12,15,16 Few attention is paid to the features of exchanging fluid. Wilke et al 17 and Lu et al 18 characterized the effectiveness of casing treatment by circulation mass flow rate in slots or grooves.…”

Section: Introductionmentioning

confidence: 99%

“…13,14 A mass of works focuses on influences on tip flow fields by suction/injection process. 12,15,16 Few attention is paid to the features of exchanging fluid. Wilke et al.…”

Section: Introductionmentioning

confidence: 99%

Analysis on slot-type casing treatment injection flow in an axial transonic compressor

Zhu

Qiang

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part A:

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The purpose of this work is to understand the properties of the injection flow through slots opening surfaces with steady and unsteady simulations. The feasibility of evaluating slot effectiveness by steady results is demonstrated. Transient features of injection flow are detailed investigated. Numerical investigations are carried out in a 1.5 axial transonic compressor stage at a specified rotating speed with seven kinds of slot-type casing treatments. Comparisons between steady/unsteady results show that differences of overall performance and injection mass flow rate are dependent on simulation methods, rather than slot configurations. Thus, correlation analysis by steady results of seven slot configurations is considered valid and reveals strong linear correlation between injection mass flow and stall margin improvements/efficiency drops. Therefore, it is practical to evaluate the effectiveness of a specific slot configuration in this compressor with steady results by calculating injection mass flow rate. Afterwards, unsteady simulations are performed with a specific configuration of arc-curve skewed slots. It is clarified that the dividing locations between suction/injection regions moves along the axial direction based on the relative rotor/slots location. Exchanging flow through slots opening surfaces displays periodic variations over time. The variation cycle for one single slot equals blade passing period T. For summation of mass flow through all slots, the cycle equals to T divided by slots number in one passage. The net flow rate through all opening surfaces is always less than zero during a blading passing period, i.e. injection mass flow rate is larger than suction flow all the time.

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“…The flow features and mechanisms in compressors under the influence of CTs have also been commonly investigated. 12–15…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on the effect of a plenum chamber with slot-type casing treatment on the performance of an axial transonic compressor

Wang

Chu

Zhang

2015

Proceedings of the Institution of Mechanical Engineers, Part A:

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Casing treatment is an effective approach for improving compressor stall margin in axial compressors. A plenum chamber, which connects slots in the circumferential direction, can occasionally be found in slot-type casing treatments. This study investigates the effect of a plenum chamber on the compressor overall performance and stall margin via timeaccurate three-dimensional numerical simulations in a transonic compressor NASA Rotor 37 with a slot-type casing treatment. Four configurations with variable height of plenum chamber are numerically investigated. The unsteady influence of the casing treatment on compressor flow fields is studied using fast Fourier transforms to gain a deeper insight into the function of the plenum chamber. The results indicate that the plenum chamber can reduce the penalty on the compressor's total pressure ratio and adiabatic efficiency induced by the casing treatment effect at the design operating condition. A detuning effect of the plenum chamber is found and proven to be responsible for the decreased compressor performance penalty through a detailed analysis in both the blade passage and casing treatments. The detuning effect dampens the unsteady influence of the casing treatment on the compressor passage flow in terms of shock oscillations and mass flow fluctuations. Thus, the radial scope and degree of the influence induced by the casing treatment is distinctly restrained by the plenum chamber. Slot circulation, which is composed of a bleed flow from the passage into the slots and injection flow from the slots into the passage, is closely related to the stall margin improvement as the casing treatment is implemented. The plenum chamber has no significant impact on the slot circulation and thus on compressor stall margin. However, shallow slots decrease the slot circulation efficiency, which leads to a much lower stall margin enhancement.

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Investigation of Blade Tip Interaction With Casing Treatment in a Transonic Compressor—Part I: Particle Image Velocimetry

Cited by 23 publications

References 17 publications

Investigation of Tip Leakage Flow and Stage Matching with Casing Treatment in a Transonic Mixed-Flow Compressor

Investigation of Tip Leakage Flow and Stage Matching with Casing Treatment in a Transonic Mixed-Flow Compressor

Analysis on slot-type casing treatment injection flow in an axial transonic compressor

Numerical investigation on the effect of a plenum chamber with slot-type casing treatment on the performance of an axial transonic compressor

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