The Experts below are selected from a list of 23226 Experts worldwide ranked by ideXlab platform

Hideaki Tamaki - One of the best experts on this subject based on the ideXlab platform.

  • stability improvement of high pressure ratio turbocharger centrifugal compressor by asymmetrical flow control part ii nonaxisymmetrical self recirculation casing treatment
    Journal of Turbomachinery-transactions of The Asme, 2013
    Co-Authors: Xinqian Zheng, Yangjun Zhang, Mingyang Yang, Takahiro Bamba, Hideaki Tamaki
    Abstract:

    This is part II of a two-part paper involving the development of an asymmetrical flow control method to widen the operating range of a turbocharger centrifugal compressor with high-pressure ratio. A nonaxisymmetrical self-recirculation casing treatment (SRCT) as an instance of asymmetrical flow control method is presented. Experimental and numerical methods were used to investigate the impact of nonaxisymmetrical SRCT on the Surge Point of the centrifugal compressor. First, the influence of the geometry of a symmetric SRCT on the compressor performance was studied by means of numerical simulation. The key parameter of the SRCT was found to be the distance from the main blade leading edge to the rear groove (Sr). Next, several arrangements of a nonaxisymmetrical SRCT were designed, based on flow analysis presented in part I. Then, a series of experiments were carried out to analyze the influence of nonaxisymmetrical SRCT on the compressor performance. Results show that the nonaxisymmetrical SRCT has a certain influence on the performance and has a larger potential for stability improvement than the traditional symmetric SRCT. For the investigated SRCT, the Surge flow rate of the compressor with the nonaxisymmetrical SRCTs is about 10% lower than that of the compressor with symmetric SRCT. The largest Surge margin (smallest Surge flow rate) can be obtained when the phase of the largest Sr is coincident with the phase of the minimum static pressure in the vicinity of the leading edge of the splitter blades.

  • stability improvement of high pressure ratio turbocharger centrifugal compressor by asymmetric flow control part ii non axisymmetric self recirculation casing treatment
    ASME Turbo Expo 2010: Power for Land Sea and Air, 2010
    Co-Authors: Xinqian Zheng, Yangjun Zhang, Mingyang Yang, Takahiro Bamba, Hideaki Tamaki
    Abstract:

    This is the Part II of a two-part paper involving the development of asymmetric flow control method to widen the operating range of a turbocharger centrifugal compressor with high-pressure-ratio. Non-axisymmetric Self Recirculation Casing Treatment (SRCT) as an instance of asymmetric flow control method is presented. Experimental and numerical methods were used to investigate the impact of non-axisymmetric SRCT on Surge Point of the centrifugal compressor. Firstly, the influence of the geometry of a symmetric SRCT on the compressor performance was studied by means of numerical simulation. The key parameter of the SRCT was found to be the distance from the main blade leading edge to the rear groove (Sr ). Next, several arrangements of a non-axisymmetric SRCT were designed, based on flow analysis presented in Part I. Then, a series of experiments was carried out to analyze the influence of non-axisymmetric SRCT on the compressor performance. Results show that the non-axisymmetry SRCT has certain influence on performance and has a larger potential for stability improvement than the traditional symmetric SRCT. For the investigated SRCT, the Surge flow rate of the compressor with the non-axisymmetric SRCT is about 10% lower than that of the compressor with symmetric SRCT. The largest Surge margin (smallest Surge flow rate) can be obtained when the phase of the largest Sr is coincident with the phase of the minimum static pressure in the vicinity of the leading edge of the splitter blades.Copyright © 2010 by ASME

  • Effect of piping systems on Surge in centrifugal compressors
    Journal of Mechanical Science and Technology, 2008
    Co-Authors: Hideaki Tamaki
    Abstract:

    There is a possibility that the exchange of the piping system may change the Surge characteristic of a compressor. The piping system of a plant is not always the same as that of a test site. Then it is important to evaluate the effect of piping systems on Surge characteristics in centrifugal compressors. Several turbochargers combined with different piping systems were tested. The lumped parameter model which was simplified to be solved easily was applied for the prediction of Surge Point. Surge lines were calculated with the linearlized lumped parameter model. The difference between the test and calculated results was within 10%. Trajectory of Surge cycle was also examined by solving the lumped parameter model. Mild Surge and deep Surge were successfully predicted. This study confirmed that the lumped parameter model was a very useful tool to predict the effect of piping systems on Surge characteristics in centrifugal compressors, even though that was a simple model.

Bo Yang - One of the best experts on this subject based on the ideXlab platform.

  • Experimental investigation of the casing treatment effects on steady and transient characteristics in an industrial centrifugal compressor
    Experimental Thermal and Fluid Science, 2013
    Co-Authors: Liang Ding, Tong Wang, Bo Yang
    Abstract:

    Abstract In this paper, a method of holed casing treatment is put forward and applied to an industrial centrifugal compressor. A series of experimental investigations are conducted to study the effects of casing treatment on steady and transient performance of the compressor. Dynamic pressure is monitored under stable operating Point and Surge occurrence condition at following positions: two ends of the treated holes, 37%-chord impeller tip position and the vaneless diffuser. By use of the casing treatment, the Surge margin of the compressor is increased by about 10%Qdesign with negligible decrease in efficiency. Pulsating pressure change is taken as an indicator for evaluating the flow direction in the hole. Near Surge Point, when the static pressure of the bleeding port is larger than the turning Point, a sudden increase in pulsating pressure indicates that the bleeding flow occurs. Near choke side, when the static pressure of the turning Point is larger than the bleeding port, a severe change in pulsating pressure indicates that the bypass flow occurs. Signal analysis of the dynamic pressure at Surge occurrence shows that the compressor stalls with a modal inception rather than a spike wave no matter casing treatment is applied or not. The travelling speed of the stall cell found in the compressor with casing treatment is faster than that with solid casing. The occurrence of modal precursor wave is delayed with casing treatment.

Xinqian Zheng - One of the best experts on this subject based on the ideXlab platform.

  • stability improvement of high pressure ratio turbocharger centrifugal compressor by asymmetrical flow control part ii nonaxisymmetrical self recirculation casing treatment
    Journal of Turbomachinery-transactions of The Asme, 2013
    Co-Authors: Xinqian Zheng, Yangjun Zhang, Mingyang Yang, Takahiro Bamba, Hideaki Tamaki
    Abstract:

    This is part II of a two-part paper involving the development of an asymmetrical flow control method to widen the operating range of a turbocharger centrifugal compressor with high-pressure ratio. A nonaxisymmetrical self-recirculation casing treatment (SRCT) as an instance of asymmetrical flow control method is presented. Experimental and numerical methods were used to investigate the impact of nonaxisymmetrical SRCT on the Surge Point of the centrifugal compressor. First, the influence of the geometry of a symmetric SRCT on the compressor performance was studied by means of numerical simulation. The key parameter of the SRCT was found to be the distance from the main blade leading edge to the rear groove (Sr). Next, several arrangements of a nonaxisymmetrical SRCT were designed, based on flow analysis presented in part I. Then, a series of experiments were carried out to analyze the influence of nonaxisymmetrical SRCT on the compressor performance. Results show that the nonaxisymmetrical SRCT has a certain influence on the performance and has a larger potential for stability improvement than the traditional symmetric SRCT. For the investigated SRCT, the Surge flow rate of the compressor with the nonaxisymmetrical SRCTs is about 10% lower than that of the compressor with symmetric SRCT. The largest Surge margin (smallest Surge flow rate) can be obtained when the phase of the largest Sr is coincident with the phase of the minimum static pressure in the vicinity of the leading edge of the splitter blades.

  • stability improvement of high pressure ratio turbocharger centrifugal compressor by asymmetric flow control part ii non axisymmetric self recirculation casing treatment
    ASME Turbo Expo 2010: Power for Land Sea and Air, 2010
    Co-Authors: Xinqian Zheng, Yangjun Zhang, Mingyang Yang, Takahiro Bamba, Hideaki Tamaki
    Abstract:

    This is the Part II of a two-part paper involving the development of asymmetric flow control method to widen the operating range of a turbocharger centrifugal compressor with high-pressure-ratio. Non-axisymmetric Self Recirculation Casing Treatment (SRCT) as an instance of asymmetric flow control method is presented. Experimental and numerical methods were used to investigate the impact of non-axisymmetric SRCT on Surge Point of the centrifugal compressor. Firstly, the influence of the geometry of a symmetric SRCT on the compressor performance was studied by means of numerical simulation. The key parameter of the SRCT was found to be the distance from the main blade leading edge to the rear groove (Sr ). Next, several arrangements of a non-axisymmetric SRCT were designed, based on flow analysis presented in Part I. Then, a series of experiments was carried out to analyze the influence of non-axisymmetric SRCT on the compressor performance. Results show that the non-axisymmetry SRCT has certain influence on performance and has a larger potential for stability improvement than the traditional symmetric SRCT. For the investigated SRCT, the Surge flow rate of the compressor with the non-axisymmetric SRCT is about 10% lower than that of the compressor with symmetric SRCT. The largest Surge margin (smallest Surge flow rate) can be obtained when the phase of the largest Sr is coincident with the phase of the minimum static pressure in the vicinity of the leading edge of the splitter blades.Copyright © 2010 by ASME

Mingyang Yang - One of the best experts on this subject based on the ideXlab platform.

  • stability improvement of high pressure ratio turbocharger centrifugal compressor by asymmetrical flow control part ii nonaxisymmetrical self recirculation casing treatment
    Journal of Turbomachinery-transactions of The Asme, 2013
    Co-Authors: Xinqian Zheng, Yangjun Zhang, Mingyang Yang, Takahiro Bamba, Hideaki Tamaki
    Abstract:

    This is part II of a two-part paper involving the development of an asymmetrical flow control method to widen the operating range of a turbocharger centrifugal compressor with high-pressure ratio. A nonaxisymmetrical self-recirculation casing treatment (SRCT) as an instance of asymmetrical flow control method is presented. Experimental and numerical methods were used to investigate the impact of nonaxisymmetrical SRCT on the Surge Point of the centrifugal compressor. First, the influence of the geometry of a symmetric SRCT on the compressor performance was studied by means of numerical simulation. The key parameter of the SRCT was found to be the distance from the main blade leading edge to the rear groove (Sr). Next, several arrangements of a nonaxisymmetrical SRCT were designed, based on flow analysis presented in part I. Then, a series of experiments were carried out to analyze the influence of nonaxisymmetrical SRCT on the compressor performance. Results show that the nonaxisymmetrical SRCT has a certain influence on the performance and has a larger potential for stability improvement than the traditional symmetric SRCT. For the investigated SRCT, the Surge flow rate of the compressor with the nonaxisymmetrical SRCTs is about 10% lower than that of the compressor with symmetric SRCT. The largest Surge margin (smallest Surge flow rate) can be obtained when the phase of the largest Sr is coincident with the phase of the minimum static pressure in the vicinity of the leading edge of the splitter blades.

  • stability improvement of high pressure ratio turbocharger centrifugal compressor by asymmetric flow control part ii non axisymmetric self recirculation casing treatment
    ASME Turbo Expo 2010: Power for Land Sea and Air, 2010
    Co-Authors: Xinqian Zheng, Yangjun Zhang, Mingyang Yang, Takahiro Bamba, Hideaki Tamaki
    Abstract:

    This is the Part II of a two-part paper involving the development of asymmetric flow control method to widen the operating range of a turbocharger centrifugal compressor with high-pressure-ratio. Non-axisymmetric Self Recirculation Casing Treatment (SRCT) as an instance of asymmetric flow control method is presented. Experimental and numerical methods were used to investigate the impact of non-axisymmetric SRCT on Surge Point of the centrifugal compressor. Firstly, the influence of the geometry of a symmetric SRCT on the compressor performance was studied by means of numerical simulation. The key parameter of the SRCT was found to be the distance from the main blade leading edge to the rear groove (Sr ). Next, several arrangements of a non-axisymmetric SRCT were designed, based on flow analysis presented in Part I. Then, a series of experiments was carried out to analyze the influence of non-axisymmetric SRCT on the compressor performance. Results show that the non-axisymmetry SRCT has certain influence on performance and has a larger potential for stability improvement than the traditional symmetric SRCT. For the investigated SRCT, the Surge flow rate of the compressor with the non-axisymmetric SRCT is about 10% lower than that of the compressor with symmetric SRCT. The largest Surge margin (smallest Surge flow rate) can be obtained when the phase of the largest Sr is coincident with the phase of the minimum static pressure in the vicinity of the leading edge of the splitter blades.Copyright © 2010 by ASME

Yangjun Zhang - One of the best experts on this subject based on the ideXlab platform.

  • stability improvement of high pressure ratio turbocharger centrifugal compressor by asymmetrical flow control part ii nonaxisymmetrical self recirculation casing treatment
    Journal of Turbomachinery-transactions of The Asme, 2013
    Co-Authors: Xinqian Zheng, Yangjun Zhang, Mingyang Yang, Takahiro Bamba, Hideaki Tamaki
    Abstract:

    This is part II of a two-part paper involving the development of an asymmetrical flow control method to widen the operating range of a turbocharger centrifugal compressor with high-pressure ratio. A nonaxisymmetrical self-recirculation casing treatment (SRCT) as an instance of asymmetrical flow control method is presented. Experimental and numerical methods were used to investigate the impact of nonaxisymmetrical SRCT on the Surge Point of the centrifugal compressor. First, the influence of the geometry of a symmetric SRCT on the compressor performance was studied by means of numerical simulation. The key parameter of the SRCT was found to be the distance from the main blade leading edge to the rear groove (Sr). Next, several arrangements of a nonaxisymmetrical SRCT were designed, based on flow analysis presented in part I. Then, a series of experiments were carried out to analyze the influence of nonaxisymmetrical SRCT on the compressor performance. Results show that the nonaxisymmetrical SRCT has a certain influence on the performance and has a larger potential for stability improvement than the traditional symmetric SRCT. For the investigated SRCT, the Surge flow rate of the compressor with the nonaxisymmetrical SRCTs is about 10% lower than that of the compressor with symmetric SRCT. The largest Surge margin (smallest Surge flow rate) can be obtained when the phase of the largest Sr is coincident with the phase of the minimum static pressure in the vicinity of the leading edge of the splitter blades.

  • stability improvement of high pressure ratio turbocharger centrifugal compressor by asymmetric flow control part ii non axisymmetric self recirculation casing treatment
    ASME Turbo Expo 2010: Power for Land Sea and Air, 2010
    Co-Authors: Xinqian Zheng, Yangjun Zhang, Mingyang Yang, Takahiro Bamba, Hideaki Tamaki
    Abstract:

    This is the Part II of a two-part paper involving the development of asymmetric flow control method to widen the operating range of a turbocharger centrifugal compressor with high-pressure-ratio. Non-axisymmetric Self Recirculation Casing Treatment (SRCT) as an instance of asymmetric flow control method is presented. Experimental and numerical methods were used to investigate the impact of non-axisymmetric SRCT on Surge Point of the centrifugal compressor. Firstly, the influence of the geometry of a symmetric SRCT on the compressor performance was studied by means of numerical simulation. The key parameter of the SRCT was found to be the distance from the main blade leading edge to the rear groove (Sr ). Next, several arrangements of a non-axisymmetric SRCT were designed, based on flow analysis presented in Part I. Then, a series of experiments was carried out to analyze the influence of non-axisymmetric SRCT on the compressor performance. Results show that the non-axisymmetry SRCT has certain influence on performance and has a larger potential for stability improvement than the traditional symmetric SRCT. For the investigated SRCT, the Surge flow rate of the compressor with the non-axisymmetric SRCT is about 10% lower than that of the compressor with symmetric SRCT. The largest Surge margin (smallest Surge flow rate) can be obtained when the phase of the largest Sr is coincident with the phase of the minimum static pressure in the vicinity of the leading edge of the splitter blades.Copyright © 2010 by ASME