Numerical Investigation on Effects of Profiled Endwall Over Purge Flow in Linear Turbine Cascade

Babu, Sushanlal; Kiran, Katari; Tom, Josin; Anish, S.

doi:10.1007/978-981-15-1892-8_14

Cited by 3 publications

(2 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The non-axisymmetric endwall profiling was introduced by Rose [15] and it was proved to significantly reduce the pressure non-uniformity. Babu et al [16] employed numerical methods to investigate the pressure-side boundary layer growth mechanism under the impact of a non-axisymmetric contouring endwall with purge flow and discovered that endwall contouring can provide highly efficient endwall protection. According to Mensch et al [17], endwall contouring impeded the development of the passage vortex and decreased the mixing of the slot jet with the mainstream.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Slot Fillet and Vane Root Fillet on the Turbine Vane Endwall Cooling Performance

Pei

Shan³

et al. 2023

Machines

View full text Add to dashboard Cite

Due to machining techniques and dust deposition, gas turbine upstream slots and vane roots are always filleted, significantly affecting the cooling performance of the endwall. The effects of upstream slot fillet and vane root fillet on the cooling performance of the gas turbine endwall were investigated by solving the three-dimensional Reynolds-averaged Navier–Stokes (RANS) equations with the shear stress transport (SST) k–ω turbulence model. The results indicate that the velocity distribution of the slot coolant is effectively changed by introducing the upstream slot fillets. Among the four cases, the largest adiabatic cooling effectiveness was obtained for the case with two similar fillets, with a 42% increase in effective cooling area compared to the traditional slot. At MFR = 0.75%, the horseshoe vortex is weakened by the introduction of the vane fillet with a small radius, with a 53% increase in effective cooling area compared to the baseline. However, the vane fillet with a large radius makes the boundary layer flow separately prematurely, decreasing the cooling performance. The lateral coverage of the coolant jet from the filmhole embedded in the vane root fillet is greatly enhanced by increasing the vane root fillet radius. However, the streamwise coverage is decreased and the thermodynamic loss is increased.

show abstract

Section: Introductionmentioning

confidence: 99%

Influence of the Slot Fillet and Vane Root Fillet on the Turbine Vane Endwall Cooling Performance

Pei

Shan³

et al. 2023

Machines

View full text Add to dashboard Cite

show abstract

“…Tao et al [14] reported that with the help of a contracted cross-sectional geometry, the purge slot could accelerate the coolant to improve the cooling effectiveness dramatically. Babu et al [15] used numerical methods to reveal the development mechanism of the pressure-side boundary layer under the influence of non-axisymmetric contouring endwall with purge flow and found that endwall contouring can provide very effective endwall protection. Zhang et al [16] combined the Kriging model with the NSGA-II algorithm and studied the influence of swirl purge flow on non-axisymmetric endwall.…”

Section: Introductionmentioning

confidence: 99%

Effect of Slot Jet Flow on Non-Axisymmetric Endwall Cooling Performance of High-Load Turbines

Jia

Song

et al. 2023

Machines

View full text Add to dashboard Cite

As vane inlet temperatures and turbine loadings are increasing, the aerodynamic and thermal management for the endwalls of gas turbines have received increased attention. Non-axisymmetric endwalls are becoming popular due to their proficient capabilities to modify the secondary flow fields and to change the film cooling performance on the endwalls. In this study, by considering the interaction between mainstream and purge flow based on non-axisymmetric endwall contouring, the numerical research model used in the present research was established. Based on the validated numerical method, the influence of the non-axisymmetric endwall contouring on the film-cooling effectiveness and aerodynamic characteristics was studied. Furthermore, the effect of different inclination angles on the film-cooling performance of the contoured endwalls was also investigated. The results indicate that for the high-load turbine vane used in this research, various types of non-axisymmetric endwall contouring can alter the aero-dynamic characteristics and cooling performance simultaneously. By inhibiting the secondary flows, non-axisymmetric endwall contouring can reduce the total cascade pressure loss coefficient by 0.305%. In addition, non-axisymmetric endwall contouring can significantly enhance the effective coverage area of purge flow up to 28.29%, and the endwall near the suction side can achieve better cooling performance. Finally, non-axisymmetric endwall contouring can improve the protective effect of large-angle purge flow.

show abstract

A numerical analysis on effects of boundary layer fence on blade passage aerodynamics and loss reduction

Babu,

Anish

2024

AIP Conference Proceedings

View full text Add to dashboard Cite

Numerical Investigation on Effects of Profiled Endwall Over Purge Flow in Linear Turbine Cascade

Cited by 3 publications

References 16 publications

Influence of the Slot Fillet and Vane Root Fillet on the Turbine Vane Endwall Cooling Performance

Influence of the Slot Fillet and Vane Root Fillet on the Turbine Vane Endwall Cooling Performance

Effect of Slot Jet Flow on Non-Axisymmetric Endwall Cooling Performance of High-Load Turbines

A numerical analysis on effects of boundary layer fence on blade passage aerodynamics and loss reduction

Contact Info

Product

Resources

About