Effect of Solidities and Nozzle Flow Angles on a Partially Admitted Small Axial-Type Turbine

Cho, Soo-Yong; Cho, Chong-Hyun; Kim, Chae-Sil

doi:10.1515/tjj.2008.25.2.111

Cited by 12 publications

(5 citation statements)

References 2 publications

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“…The flow channel structure [6,7], nozzle arrangement [8,9], and blade parameters [10,11] were determined to be the key elements impacting the performance of partial admission turbines. Researchers generally concurred that, in terms of flow channel structure, reducing the axial clearance between the nozzle and rotor within a suitable range can result in greater efficiency [12,13] and with decreasing mass flow rate, the efficiency and optimum speed ratio decline. Researchers generally concurred with the effect of the number of inlet nozzles that an increase in the number of inlet nozzles with the same partial admission degree will duplicate the admission losses and hence decrease turbine efficiency [14,15].…”

Section: Introductionmentioning

confidence: 99%

Compressed air energy storage system: Effect of variable relative stator installation angle on nozzle governing turbine performance

Guan,

Li,

Zhu

et al. 2024

J. Phys.: Conf. Ser.

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The air storage pressure of compressed air energy storage system gradually decreases during the process of energy release, and a reasonable air distribution method for the turbine is required to make the turbine work efficiently in this process. In this paper, based on the single nozzle governing method, the effect of the variation of the full circumferential relative stator installation angle on the system performance improvement under the rated output work condition is investigated. It is shown that the specific work of the variable relative stator installation angle can be improved by up to 6.3 % relative to the design stator installation angle and up to 15.7 % relative to the throttle governing method under the base pressure of 10.0 MPa. With the same absence of throttling losses, the specific work of 3-nozzle inlets method is higher than that of 4-nozzle inlets method, and the turbine internal losses are reduced by 10.6 %. This study provides a theoretical basis for the design, optimization and operation control of nozzle governing turbines.

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Section: Introductionmentioning

confidence: 99%

Compressed air energy storage system: Effect of variable relative stator installation angle on nozzle governing turbine performance

Guan,

Li,

Zhu

et al. 2024

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

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“…The results obtained from viscous unsteady computations were also validated through the experiment performed by Boulin. Further investigations on the performance of turbine in partial admission through numerical simulation or experiment has been conducted by Lampart [6], Fridh et al [7], Cho et al [8], Hushmandi [9], Fridh [10], Cho [11,12].…”

Section: Introductionmentioning

confidence: 99%

Full 3-D Unsteady Numerical Simulation of Control Stage in Partial Admission Turbine

Gao

Yang

et al. 2015

AMM

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The unsteady flow parameters in control stage of partial admission are analyzed in details with full 3-D numerical simulation. The full annulus structure of air turbine in partial admission is modeled due to the unsymmetrical geometry. The partial admission is accomplished through the inlet blocked using segmental arc. The unsteady surface pressure changes of eight blades in the transition regions which demonstrate the power output ability are presented. That the entropy rise associated with the losses at different cross mainly caused by mixing losses and flow separation in partial admission is analyzed to estimate the efficiency distribution.

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“…It was concluded that there was optimal inlet position that makes efficiency highest. Cho et al [6] presented the effect of flow parameter on aerodynamic performance of partial admission axial flow turbine, such as nozzle flow outlet angle, solidity of rotor. The optimal parameters were obtained using three different solidities and four nozzle flow outlet angle in experiment.…”

Section: Introductionmentioning

confidence: 99%

Computational Fluid Dynamics Modeling Three-Dimensional Unsteady Turbulent Flow and Excitation Force in Partial Admission Air Turbine

Xie

Gao

Lan

et al. 2013

Mathematical Problems in Engineering

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Air turbines are widely used to convert kinetic energy into power output in power engineering. The unsteady performance of air turbines with partial admission not only influences the aerodynamic performance and thermodynamic efficiency of turbine but also generates strong excitation force on blades to impair the turbine safely operating. Based on three-dimensional viscous compressible Navier-stokes equations, the present study employs RNG (Renormalization group)k-εturbulence model with finite volume discretization on air turbine with partial admission. Numerical models of four different admission rates with full annulus are built and analyzed via CFD (computational fluid dynamics) modeling unsteady flows. Results indicate that the unsteady time-averaged isentropic efficiency is lower than the steady isentropic efficiency, and this difference rises as unsteady isentropic efficiency fluctuates stronger when the admission rate is reduced. The rotor axial and tangential forces with time are provided for all four admission rates. The low frequency excitation forces generated by partial admission are extraordinarily higher than the high frequency excitation forces by stator wakes.

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Effect of Solidities and Nozzle Flow Angles on a Partially Admitted Small Axial-Type Turbine

Cited by 12 publications

References 2 publications

Compressed air energy storage system: Effect of variable relative stator installation angle on nozzle governing turbine performance

Compressed air energy storage system: Effect of variable relative stator installation angle on nozzle governing turbine performance

Full 3-D Unsteady Numerical Simulation of Control Stage in Partial Admission Turbine

Computational Fluid Dynamics Modeling Three-Dimensional Unsteady Turbulent Flow and Excitation Force in Partial Admission Air Turbine

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