An Experimental Study on the Effects of a Film Cooling Configuration and Mainstream Temperature on Depositing

Liu, Zhengang; Zhang, Fei; Liu, Yanan

doi:10.1007/s11630-019-1087-7

Cited by 5 publications

(3 citation statements)

References 14 publications

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“…They also found that the particle deposition increases with the mainstream temperature increasing. Liu et al 9 conducted the experiment at a temperature much lower than Crosby et al 8 and they obtained a similar conclusion, but at the same time, they also found that when the mainstream temperature is higher than a certain value, the deposition decreases with the mainstream temperature increasing. The deposition of particles with coal-water fuel was experimentally studied by Wenglarz and Fox 10 and it was found that the deposition increases with the surface temperature increasing.…”

Section: Introductionmentioning

confidence: 75%

A Numerical Study of the Effect of Particle Size on Particle Deposition on Turbine Vanes and Blades

Liu

Diao

Zhang

2021

Advances in Mechanical Engineering

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Particle deposition could decrease the aerodynamic performance and cooling efficiency of turbine vanes and blades. The particle motion in the flow and its temperature are two important factors affecting its deposition. The size of the particle influences both its motion and temperature. In this study, the motion of particles with the sizes from 1 to 20 μm in the first stage of a turbine are firstly numerically simulated with the steady method, then the particle deposition on the vanes and blades are numerically simulated with the unsteady method based on the critical viscosity model. It is discovered that the particle deposition on vanes mainly formed near the leading and trailing edge on the pressure surface, and the deposition area expands slowly to the whole pressure surface with the particle size increasing. For the particle deposition on blades, the deposition area moves from the entire pressure surface toward the tip with the particle size increasing due to the effect of rotation. For vanes, the particle capture efficiency increases with the particle size increasing since Stokes number and temperature of the particle both increase with its size. For blades, the particle capture efficiency increases firstly and then decreases with the particle size increasing.

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Section: Introductionmentioning

confidence: 75%

A Numerical Study of the Effect of Particle Size on Particle Deposition on Turbine Vanes and Blades

Liu

Diao

Zhang

2021

Advances in Mechanical Engineering

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“…The Nusselt number and friction coefficient of RBHXs with corrugated tubes are both higher than RBHXs with circular smooth tubes, and the comprehensive performance is enhanced by 28%. [21,22] Wang et al demonstrated that the overall performance of RBHXs with curved rods and tubes aligned triangularly is 10% greater than RBHXs with circular rods and tubes aligned squarely. [23] Yu et al studied the thermo-hydraulic performance of shell and tube heat exchangers (STHXs) with curve-rod baffles (CRB) or anti-vibration hexagon clamping baffles (HCB) based on a periodic four-tube unit model.…”

Section: Introductionmentioning

confidence: 99%

Performance enhancement and optimization for rod‐baffle heat exchangers with twisted oval tubes

Duan

Xiao

Sun³

et al. 2022

Can J Chem Eng

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Twisted oval tubes were proposed to be installed in rod‐baffle heat exchangers (RBHXs) to enhance heat transfer performance. A comparison between RBHXs with twisted oval tubes and those with circular tubes is performed. The results show that the heat transfer coefficient (h) per unit pressure drop (Δp) of RBHXs with twisted oval tubes is larger than 36.01%~100.24% compared with that of circular tubes when Reynolds numbers are 4577~22 889, and heat transfer enhancement is more obvious under lower inlet velocity. Then the structural parameters of RBHXs with twisted oval tubes are optimized using the response surface model and genetic algorithms. The results show that the h decreases first and then remains constant with the increase of the twisted pitch length, and decreases first and then rises again with the increase of the ratio of long axis to short axis. The Δp almost keeps constant with increasing twisted pitch length and decreases by 36.67% with the increase in the ratio of long axis to short axis. The comprehensive performance index h/Δp of the RBHXs with twisted oval tubes is enhanced by an average of 26.42% compared with that of original structure. The research results have a good guideline for heat transfer enhancement and the structural design of RBHXs.

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“…Albert et al [15,16] simulated particle deposition at the turbine vane leading edge and on the pressure surface in a low-speed wind tunnel facility by matching the Stokes numbers and thermal scaling parameter (TSP). Zhang et al [17,18] carried out deposition tests at different mainstream temperatures and velocities with wax particles and found deposition mass increased initially and then decreased with the mainstream temperature or velocity. Zhang et al [19] also investigated the effect of the angle of attack and particle concentration on the wax deposition behavior.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Sand Particle Deposition on a Film-Cooled Turbine Blade at Different Gas Temperatures and Angles of Attack

Zhang

Liu

et al. 2020

Energies

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Particle deposition tests were conducted in a turbine deposition facility with an internally staged single-tube combustor to investigate the individual effect of the gas temperature and angle of attack. Sand particles were seeded to the combustor and deposited on a turbine blade with film-cooling holes at temperatures representative of modern engines. Fuel-air ratios were varied from 0.022 to 0.037 to achieve a gas temperature between 1272 and 1668 K. Results show that capture efficiency increased with increasing gas temperature. A dramatic increase in capture efficiency was noted when gas temperature exceeded the threshold. The deposition formed mostly downstream of the film-cooling holes on the pressure surface, while it concentrated on the suction surface at the trailing edge. Deposition tests at angles of attack between 10° and 40° presented changes in both deposition mass and distribution. The capture efficiency increased with the increase in the angle of attack, and simultaneously the growth rate slowed down. On the blade pressure surface, sand deposition was distributed mainly downstream of the film-cooling holes near the trailing edge in the case of the small angle of attack, while it concentrated on the region around the film-cooling holes near the leading edge, resulting in the partial blockage of holes, in the case of the large angle of attack.

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An Experimental Study on the Effects of a Film Cooling Configuration and Mainstream Temperature on Depositing

Cited by 5 publications

References 14 publications

A Numerical Study of the Effect of Particle Size on Particle Deposition on Turbine Vanes and Blades

A Numerical Study of the Effect of Particle Size on Particle Deposition on Turbine Vanes and Blades

Performance enhancement and optimization for rod‐baffle heat exchangers with twisted oval tubes

Experimental Study of Sand Particle Deposition on a Film-Cooled Turbine Blade at Different Gas Temperatures and Angles of Attack

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