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Effect of fillet radius of receiver hole on the performance of gas turbine pre-swirl system

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Abstract

Since the main flow blades of gas turbines are in high temperature and high pressure condition, their life span depends on the performance of the cooling system. A pre-swirl system is a device that minimizes the flow loss that occurs when the cooling air is introduced into the rotating part from the stationary part by imposing the rotation component in advance. System performance depends on the shape of the pre-swirl nozzle and receiver hole. In this study, the performance trend according to the shape change of a direct injection type pre-swirl system was numerically investigated. First, the performance was examined by varying the system inlet/outlet pressure ratio, from which the optimum flow rate of the system was determined. When a study was conducted by changing the fillet radius of the receiver hole inlet, the larger radius results in greater discharge coefficient, but there was no significant difference for radius ratio greater than 0.13. Rather interestingly, the outlet of the receiver hole without a fillet that does not spread the cooling air produced a high value of temperature drop efficiency.

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Abbreviations

A N :

Pre-swirl nozzle throat area, m2

A R :

Receiver hole throat area, m2

b :

Outer radius at the cavity, m

C W :

Non-dimensional mass flow rate

C D :

Discharge coefficient of pre-swirl system

C DN :

Discharge coefficient of pre-swirl nozzle

C DR :

Discharge coefficient of receiver hole

ṁ :

Mass flow rate, kg/s

P :

Pressure, Pa

R :

Specific gas constant, J/kg • K

r :

Radius, m

r p :

Pressure ratio of pre-swirl system

r r :

Radius ratio

T :

Temperature, K

v :

Velocity, m/s

β :

Swirl-ratio

κ :

Isentropic exponent

Ω:

Angular velocity of rotor, rad/s

0 :

Pre-swirl nozzle inlet

1 :

Pre-swirl nozzle outlet

2 :

Receiver hole outlet

f :

Fillet

id :

Ideal

in :

Pre-swirl system inlet

out :

Pre-swirl system outlet

rel :

Relative frame

R :

Receiver hole

s :

Static

t :

Total

σ :

Circumferential

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Acknowledgments

This study was conducted as part of the UAV Turbine Research Center supported by the Defense Acquisition Program Administration and the Agency for Defense Development.

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Authors and Affiliations

  1. School of Mathematics and Computing, Yonsei University, Seoul, 03722, Korea

    Seunghwan Kim, Junghoon Lee & Changhoon Lee

  2. 3rd Directorate, Aerospace Research Institute, Agency for Defense Development, Daegeon, 34186, Korea

    Donghwa Kim

  3. Department of Mechanical Engineering, Yonsei University, Seoul, 03722, Korea

    Changhoon Lee

Authors
  1. Seunghwan Kim
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  2. Junghoon Lee
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  4. Changhoon Lee
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Correspondence to Changhoon Lee.

Additional information

Seunghwan Kim is a Master student in the School of Mathematics and Computing at Yonsei University in Seoul, Korea. He is a member in Turbulence Laboratory and majoring turbulent fluid mechanics. He has studied aerodynamic analysis of gas turbine secondary air system.

Changhoon Lee is a Professor of Mechanical Engineering at Yonsei University in Seoul, Korea. He received his Ph.D. from University of California at Berkeley in 1993. His research interests include fundamentals of turbulence, particle-turbulence interaction, numerical algorithms, air pollution modeling, and stochastic processes.

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Kim, S., Lee, J., Kim, D. et al. Effect of fillet radius of receiver hole on the performance of gas turbine pre-swirl system. J Mech Sci Technol 36, 6073–6081 (2022). https://doi.org/10.1007/s12206-022-1122-6

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  • DOI: https://doi.org/10.1007/s12206-022-1122-6

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