On the Heat Transfer and Flow Structures’ Characteristics of the Turbine Blade Tip Underside With Dirt Purge Holes at Different Locations by Using Topological Analysis

Luo, Lei; Zhao, Zhiqi; Kan, Xiaoxu; Qiu, Dandan; Wang, Songtao; Wang, Zhongqi

doi:10.1115/1.4042654

Cited by 14 publications

(4 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…9 An analysis of the heat transfer is indeed of fundamental importance for the cooling system and different works studied the improvement of thermal characteristics through design modifications. 10–14 Nevertheless, the present study focuses only on the flow field characteristics, in agreement with the study of Verstraete et al. 1 and Coletti et al.…”

Section: Introductionsupporting

confidence: 87%

Comparison of large eddy simulation and Reynolds-averaged Navier–Stokes evaluations with experimental tests on U-bend duct geometry

Alessi

Verstraete

Koloszar

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part A:

View full text Add to dashboard Cite

The correct prediction of the flow field is of crucial importance to drive numerical optimization to a real improvement of a design. For this purpose, different numerical approaches can be used to study the fluid dynamics characteristics and the performance of the design. In particular, in the present work the Reynolds-averaged Navier–Stokes and large eddy simulation approach are compared for an internal aerodynamic application. The obtained solutions are validated against experiments through a quantitative and qualitative comparison, i.e. pressure measurements and particle image velocimetry flow visualizations, respectively.

show abstract

Section: Introductionsupporting

confidence: 87%

Comparison of large eddy simulation and Reynolds-averaged Navier–Stokes evaluations with experimental tests on U-bend duct geometry

Alessi

Verstraete

Koloszar

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part A:

View full text Add to dashboard Cite

show abstract

“…As a conclusion, through the validation of turbulence models, average Nu and pressure drop, and Nu contours, considering that Luo et al [12,21], Zhao et al [13], Xie and Sund en [22] also confirmed that the RNG k-E model can effectively predicts the tip heat transfer and pressure drop penalty, the present study chooses the RNG k-E turbulence model to simulate the current flow and heat transfer problems.…”

Section: Numerical Validationmentioning

confidence: 53%

“…As mentioned above, there is small amount of studies focusing on the internal cooling influenced by bleed hole extraction, especially for the blade tips of gas turbines. Luo et al [12] analyzed the flow structures and the mechanism of heat transfer augmentation at the internal tip with bleed holes in a U bend channel. The results showed that the double holes placed on the mid portion of the blade tip provided the highest thermal performance among the studied cases.…”

Section: Introductionmentioning

confidence: 99%

Vortical structures and heat transfer augmentation of a cooling channel in a gas turbine blade with various arrangements of tip bleed holes

Zhao

Luo

Qiu

et al. 2020

Numerical Heat Transfer, Part A: Applications

Self Cite

View full text Add to dashboard Cite

This study investigates the internal cooling processes affected by the tip bleed holes in gas turbine blades. Double bleed holes are fixed at the center of the blade tip near the pressure side and suction side, respectively. Five different arrangements of the holes along the center line of the tip are studied. The purely double holes are set as the Baseline. The purpose of the present study is to provide a new perspective of the tip film cooling to understand the internal flow processes, vorticity evolution and the mechanism of the heat transfer augmentation. A topological analysis and the boundary layer analysis methods are introduced to better understand the tip heat transfer. The total extraction area and volume is kept at the same level for all the studied cases. The results show that the Dean vortices and the near-wall vortices induced by the secondary flow contribute to the high heat transfer coefficient on the tip surface. The mixing effect of the Dean vortices and the hole extraction helps to enhance heat transfer upstream of the tip. Different arrangement of the bleed holes can affect the internal flow processes and heat transfer performance. The suction effect of the center-line bleed hole can accelerate the near-hole flow and reduce the thickness of the boundary layer. The center-line hole fitted at the middle of the tip affects significantly the rear side of the hole. Thus, the holes aligned in the middle of the tip provide the highest heat transfer and thermal performance. The thermal performance is enhanced by up to 4.7% compared with the Baseline.

show abstract

“…Guo et al (2019) studied the blade tip leakage vortex cavitation characteristics for an axial waterjet pump. Luo et al (2019) numerically investigated the impact of the holes and their location on the flow and tip internal heat transfer in a U-bend channel using topological analysis. Xue and Ng (2018) provided an overview of gas turbine blade tip external cooling technologies, and they also provided an outlook on the future of cooling technology for blade tips.…”

Section: Introductionmentioning

confidence: 99%

Effect of Film Position on the Flow and Heat Transfer Characteristics of Full-Ribbed Rotor Tip

et al. 2022

Self Cite

View full text Add to dashboard Cite

This article numerically studied the flow and heat transfer characteristics of the full-ribbed fluted tip of a rotor with four types of distribution of cooling films, namely, the mid-arc uniform film at the bottom of the groove, the uniform film on full perimeter ribs, the uniform film on the suction-side rib, and the uniform film on the pressure-side rib. The evolution of secondary flow in the tip clearance under these four conditions was discussed, and the effect of cooling film position on the tip leakage flow and tip heat transfer was also studied. The results showed that films in the ribs were more conducive to lower leakage flow rates and can reduce total energy losses. Adding cooling films on the single-side rib had a better effect on the control of leakage flow rate, with the most significant improvement due to adding cooling films on the suction-side rib. The mid-arc jet at the bottom of the groove can greatly contain the swirl structure in the groove, but it weakened the air sealing effect, which led to a rise in leak flow. The main reason for the swirl structure in the groove was that the leakage flow from the tip of the rotor was blocked by the cold air jet from the cooling films to form a backflow. The vortex inside the groove was the most violent when the air film hole was set on the pressure side, so the loss coefficient was higher, while the vortex inside the groove was the simplest when the cooling film hole was set on the suction side, and the energy loss caused by the vortex inside the groove was the least, and this structure was more favorable to the cooling of the leaf tip. It was also found that the uniformity of the outlet airflow angle distribution improved in the presence of cold air injection on the tip of the rotor.

show abstract

On the Heat Transfer and Flow Structures’ Characteristics of the Turbine Blade Tip Underside With Dirt Purge Holes at Different Locations by Using Topological Analysis

Cited by 14 publications

References 29 publications

Comparison of large eddy simulation and Reynolds-averaged Navier–Stokes evaluations with experimental tests on U-bend duct geometry

Comparison of large eddy simulation and Reynolds-averaged Navier–Stokes evaluations with experimental tests on U-bend duct geometry

Vortical structures and heat transfer augmentation of a cooling channel in a gas turbine blade with various arrangements of tip bleed holes

Effect of Film Position on the Flow and Heat Transfer Characteristics of Full-Ribbed Rotor Tip

Contact Info

Product

Resources

About