Numerical predictions of roughness effects on the performance degradation of an axial-turbine stage

Kang, Young-Seok; Yoo, Jae Won; Kang, Shin-Hyoung

doi:10.1007/bf02916007

Cited by 5 publications

(4 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The results show that for the rotor and NGV, the size and depth of the wake zone increases as the roughness value increases. The profile loss generated due to the roughness increment near the trailing edge at the blade suction side was the reason for the wake increase as stated by Kang et al [35]. The effect of the roughness was less significant in the case of the rotor when compared to the NGV due to the high turning of the stationary blades.…”

Section: Resultsmentioning

confidence: 79%

“…Between 70% of the axial chord and the trailing edge, the surface roughness value significantly affects the pressure distribution of the suction side surface. In fact, the pressure coefficient decreased with the increment of surface roughness resulting in a higher pressure difference between the blade suction and pressure sides and consequently a higher flow deviation angle as stated by [18,35]. The reduction of the pressure coefficient at the suction side near the blade trailing edge was a result of the total pressure loss increment.…”

Section: Figure 8: Rotor Friction Coefficientmentioning

confidence: 94%

“…The roughness effects can be activated in CFX and modelled by including a downstream shift in the logarithmic velocity profile equation (equation 1). This downstream shift (equation 2) is a function of the dimensionless value of the roughness height and for the sand grain roughness which can be calculated using equation 3 [31,[35][36][37].…”

Section: Numerical Modellingmentioning

confidence: 99%

See 2 more Smart Citations

Assessment of Surface Roughness Effects on Micro Axial Turbines

Gamil

Nikolaidis

Teixeira

et al. 2020

Volume 8: Industrial and Cogeneration; Manufacturing Materials and Metallurgy; Marine; Microturbines, Turbochargers, and Small

View full text Add to dashboard Cite

Surface roughness significantly affects the aerodynamics and heat transfer within micro-scale turbine stages. It results in a considerable increment in the blade profile loss and leads consequently to sizeable performance reductions. The provision of low roughness surfaces in micro gas turbine stages presents challenges on account of the small (mm scale) sizes, manufacturing complexity and associated costs. The axial turbine investigated in this study is fitted to Samad Power’s TwinGen domestic micro combined heat and power unit. The micro gas turbine has a compressor pressure ratio of 3, 1200K turbine inlet temperature and a rotational speed of 170,000 rpm. This paper presents a numerical assessment of the effects of varying the surface roughness on the performance and heat transfer of the micro turbine. The surface roughness was uniformly distributed on the NGV and rotor blades. The results showed that increasing the surface roughness from 3 microns to 6, 20, and 100 microns resulted in a reduction in stage total efficiency of 0.8%, 4% and 12% respectively as well as a comparable decrease in output power (0.7%, 3.6%, and 11% respectively). The turbine temperature was also observed to be very sensitive to surface roughness and a temperature increase of some 5% at the rotor hub and over 4% increment in the blade tip surface was observed for 100 microns when compared to the 3 microns surface roughness case. The findings of this paper highlight the adverse effects of the surface roughness on the micro-turbine performance and temperature distribution as well as the importance of careful consideration of wall roughness during the design and manufacturing stages.

show abstract

Section: Resultsmentioning

confidence: 79%

Section: Figure 8: Rotor Friction Coefficientmentioning

confidence: 94%

Section: Numerical Modellingmentioning

confidence: 99%

See 1 more Smart Citation

Assessment of Surface Roughness Effects on Micro Axial Turbines

Gamil

Nikolaidis

Teixeira

et al. 2020

Volume 8: Industrial and Cogeneration; Manufacturing Materials and Metallurgy; Marine; Microturbines, Turbochargers, and Small

View full text Add to dashboard Cite

show abstract

“…In the paper, some figures about the difference between experimental and numerical obtained efficiency are presented. It is also possible to find research work about the degradation of an axial-turbine stage [8] as a consequence of wall roughness using the CFD analysis. Some papers dealing with wall roughness are devoted to different topics like mine ventilation networks [9] or just numerical analysis around blades [10] as well as numerical analysis of the flow in the pipes with rough walls [11].…”

Section: Introductionmentioning

confidence: 99%

Wall Roughness Influence on the Efficiency Characteristics of Centrifugal Pump

Lipej¹,

Muhič²,

Mitruševski³

2017

SV-JME

View full text Add to dashboard Cite

The aerodynamic performance degradation analysis of a small high bypass turbofan engine compression system with fan rotor blade leading edge erosion

Shi

Jiang

Huang

et al. 2023

International Journal of Turbo &Amp; Jet-Engines

View full text Add to dashboard Cite

The entire compression system of DGEN380 was selected to study the degradation of aerodynamic characteristics caused by erosion of the leading edge. Numerical simulations under different degrees of leading edge erosion were performed. It was found that the leading edge erosion causes a significant decrease in operability from 70 % of the blade height to the tip, and mainly affects the subsequent flow field in the bypass. At 90 % of blade height, the isentropic efficiency and total pressure ratio of the blade with leading edge erosion are reduced compared to the origin blade. Afterwards, the thrust equation was introduced to analyze the effect of leading edge erosion on the thrust loss under different operating conditions of the aircraft. Among the three operating conditions, the thrust loss rate of the cruise condition was the largest, which provided a reference for the subsequent evaluation of the blade repair condition.

show abstract

Numerical predictions of roughness effects on the performance degradation of an axial-turbine stage

Cited by 5 publications

References 6 publications

Assessment of Surface Roughness Effects on Micro Axial Turbines

Assessment of Surface Roughness Effects on Micro Axial Turbines

Wall Roughness Influence on the Efficiency Characteristics of Centrifugal Pump

The aerodynamic performance degradation analysis of a small high bypass turbofan engine compression system with fan rotor blade leading edge erosion

Contact Info

Product

Resources

About