Study on static and dynamic characteristics of an axial fan with abnormal blade under rotating stall conditions

Zhang, Lei; He, Ruiyang; Wang, Xin; Zhang, Qian; Wang, Songling

doi:10.1016/j.energy.2018.12.125

Cited by 47 publications

(9 citation statements)

References 18 publications

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“…Zhang et al. 27–29 studied the influence of abnormal stator angle on the evolution of stall. They proposed that the change in stator angle caused the engine fell into stall condition in advance, but did not change the type of stall inception.…”

Section: Introductionmentioning

confidence: 99%

Investigation of stall recovery potential in a transonic compressor rotor

Lang

Chu

Spence

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part A:

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In order to evaluate the potential of stall recovery at different operating points during the stall process in a transonic environment, three-dimensional multi-passage numerical simulations were conducted on the transonic compressor, NASA Rotor 37. The results showed that the whole stall evolution process can be divided into three stages depending upon the possibility for the compressor to recover to a stable operating condition by reducing the outlet pressure. At the first stage of the stall process, the compressor could successfully be driven back to a stable operating state by decreasing the outlet pressure. In addition, it was observed that the time of the stall recovery process was shorter when the outlet pressure was lowered more. At the second stage of stall, the magnitude of the outlet pressure played a decisive role in determining whether the compressor could recover to a stable state. When the compressor operation moved to the third stage of the stall process, “stall hanging” occurred, which means that the compressor could not recover from the stall regardless of how much the outlet pressure was reduced.

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Section: Introductionmentioning

confidence: 99%

Investigation of stall recovery potential in a transonic compressor rotor

Lang

Chu

Spence

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…For a short vaneless diffuser with a radius ratio of 1.5, the stall frequency hardly changes with the flow rate. (3) The key factors in stall induction in vaneless diffusers with different radius ratios are the same, but the processes of stall are different. For a wide vaneless diffuser with a centrifugal compressor, the development of the outlet reflux to the interior leads to the distortion of the core flow and induces the rotating stall finally.…”

Section: Discussionmentioning

confidence: 99%

“…However, instability has plagued the safe and stable operation of small flow compressors, such as rotating stalls and surges. When a rotating stall occurs, the performance of a centrifugal compressor will drop sharply, and the blades will be damaged due to the alternating stress [1][2][3]. Rotating stall can occur in the diffuser and impeller [4].…”

Section: Introductionmentioning

confidence: 99%

Study on Two Types of Stall Patterns in a Centrifugal Compressor with a Wide Vaneless Diffuser

Zhang

Huo

et al. 2020

Processes

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Two types of stall patterns in the centrifugal compressor with a wide vaneless diffuser were numerically studied in this paper. We carried out kinds of three-dimensional numerical simulations of the instability process in wide vaneless diffusers with different radius ratios. The results show that there are two kinds of stall patterns in wide vaneless diffusers with different radius ratios. For a short diffuser with a radius ratio of 1.5, the speed of the propagation of stalled cells is relatively high, and the propagation speed and frequency of stall cells do not change with the decrease in the flow rate. For a long diffuser with a radius ratio of 1.8, the propagation velocity of stall cells is smaller to the one in the short diffuser, and increases with the decrease in flow rate. For wide vaneless diffusers with different radius ratios, the main factor causing stall is the outlet reflux. Reducing the radius ratio of the wide vaneless diffuser has an important influence on the stability of the centrifugal compressor.

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“…For the limitation of the experimental conditions, the numerical model in this paper was validated by comparing the result of simulation with the experimental data of Krain's impeller from the opening literature [23] in the authors' previous paper [24]. Krain's impeller is a transonic compressor impeller designed by Krain et al [25].…”

Section: Validation Of the Numerical Modelmentioning

confidence: 99%

Effect of Vaneless Diffuser Shape on Performance of Centrifugal Compressor

et al. 2020

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The influence of four different vaneless diffuser shapes on the performance of centrifugal compressors is numerically studied in this paper. One of the studied shapes was a parallel wall diffuser. Two others had the width reduced only from hub and shroud and the rest had the width reduced from hub and shroud divided evenly. Then the numerical simulation was employed and the overall compressor aerodynamic performance was studied. The detailed velocity and pressure distribution and energy loss within the centrifugal compressor with different diffuser geometries and different operating conditions were analyzed. The results revealed that shroud pinch significantly improved the overall compressor aerodynamic performance more than any other pinch types, and the best performance can be achieved by pinched diffusers under the design condition compared with pinched diffusers under the near surge condition or choking condition. The range of energy loss, namely the static entropy area in the compressor, become reduced with the above three pinches diffusers.

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Study on static and dynamic characteristics of an axial fan with abnormal blade under rotating stall conditions

Cited by 47 publications

References 18 publications

Investigation of stall recovery potential in a transonic compressor rotor

Investigation of stall recovery potential in a transonic compressor rotor

Study on Two Types of Stall Patterns in a Centrifugal Compressor with a Wide Vaneless Diffuser

Effect of Vaneless Diffuser Shape on Performance of Centrifugal Compressor

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