• Title/Summary/Keyword: Blade-To-Blade

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Prediction of Compressor Fouling Using an Analytic Method (해석적 방법을 통한 압축기의 파울링 해석)

  • Song, Tae Won;Kim, Tong Seop;Kim, Jae Hwan;Ro, Sung Tack
    • 유체기계공업학회:학술대회논문집
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    • 2000.12a
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    • pp.176-183
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    • 2000
  • The performance of gas turbines decreases as their operating hours increase. Compressor fouling is the main reason for this time-dependent performance degradation. Airborne particles adhere to the blade surface and results in the change in the blade shape. It is difficult to exactly analyze the mechanism of the compressor fouling because the growing process of the fouling is very slow and the dimension of the fouled depth is very small compared with blade dimensions. In this study, an analytic method to predict the motion of particles and their deposition inside axial flow compressors is proposed. The analytic model takes into account the blade shape and the flow within the blade passage. Comparison of simulation result with field data shows the feasibility of the model. Influence of the particle distribution on the compressor fouling is also examined.

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Noise Reduction of Blade Vortex Interaction Using Tip Jet Blowing

  • Yang Choongmo;Baek Jehyun;Saito Shigeru;Aoyama Takashi
    • 한국전산유체공학회:학술대회논문집
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    • 2003.10a
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    • pp.172-174
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    • 2003
  • Nnumerical investigations of the tip vortical characteristics were conducted with lateral tip blowing to reduce Blade-Vortex Interaction (BVI) noise. The predictions of BVI noise were performed using a combined method of an unsteady Euler code with an aeroacoustic code based on Ffowcs- Williams and Hawkings formulation. A moving overlapped grid system with three types of grids (blade grid, inner and outer background grid) was used to simulate BVI of helicopter with two OLS-airfoil blades in forward/ descending flight condition. The calculated waveform of BVI noise, which is characterized by the distinct peaks caused during blade vortex interaction, clearly shows the effect of lateral blowing at tip to reduce BVI noise

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Structural design and evaluation of a 3MW class wind turbine blade

  • Kim, Bum-Suk
    • Journal of Advanced Marine Engineering and Technology
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    • v.38 no.2
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    • pp.154-161
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    • 2014
  • This research presents results of structural designs and evaluations for 3MW Wind Turbine Blade by FEM analysis. After the GFRP model was designed as a baseline model, failure check by Puck's failure criterion and buckling analysis were accomplished to verify safety of wind turbine blade in the critical design load case. Moreover, applicability of two kinds of carbon spar cap model, was studied by comparing total mass, price and tip deflection to the GFRP model. The results showed that the GFRP model had sufficient structural integrity in the critical design load case, and the carbon spar cap model could be a reasonable solution to reduce weights, tip deflections.

Approximate Modeling of Doctor Blade Contact Pressure for Realization of Uniform Image Quality (균일 화상 품질 구현을 위한 닥터 블레이드 접촉압력 근사모델링)

  • Choi, Ha-Young;Park, Seung Chan;Lee, Jongsoo
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.22 no.2
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    • pp.241-247
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    • 2013
  • The doctor blade is equipped in a toner cartridge and is a device to maintain the uniform thickness of a toner by controlling the pressure on the developing roller. The contact pressure between the developing roller and the doctor blade is one of the significant factors for image quality and durability of toner cartridge. The purpose of this study is to develop approximation model in order to minimize the time and cost which are needed much required in making optimal design of the doctor blade. Central composite design was used for the design of experiment and response surface design was used for approximation. The data for contact pressure were acquired through finite element analysis and data of image density and toner weight were acquired through experiment. The approximation model developed in this study has presented very high fitness.

Dystopia in the Science Fiction Film: Blade Runner and Adorno's Critique of Modern Society

  • Park, Seung-Hyun
    • International Journal of Contents
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    • v.8 no.3
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    • pp.94-99
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    • 2012
  • Science fiction films touch coming-future themes, particularly those referring specifically to futuristic technology and its influence over human life. Dealing with the resistance of the replicants in the approaching millennium, Blade Runner brings the feat of modern civilization into doubt through the image of the dystopian future. In Blade Runner, a city is filled with waste, pollution, and dirt and a corrosive rain falls from the polluted clouds. Adorno criticizes contemporary society and its civilization. Characterizing advanced capitalist society by its total administration penetrating into every sphere of life, he contends that modern society promotes alienation, atomization, conformism, and fatalism. Blade Runner provides a chance to contemplate the problems of modern society, proposed by Adorno's critical works. Therefore, this paper attempts to analyze futuristic characteristics described in the film with Adorno's critique of modern society.

A Study on the X-Ray Fractography of Turbine Blade under Fatigue Load (피로하중을 받는 터빈 블레이드의 X선의 프랙토그래피에 관한 연구)

  • 김성웅;이동우;홍순혁;조석수;주원식
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2001.04a
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    • pp.778-783
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    • 2001
  • Turbine blade is subject to cyclic bending force by steam pressure. Stress analysis by fractography is already established technology as means for seeking cause of fracture and has been widely employed. In the X-ray fractography, plastic deformation and residual stress near the fracture surface can by determined and information of internal structure of material can be obtained. Therefore, to find a fracture mechanism of torsion-mounted blade in nuclear power plant, based on the information from the fracture surface obtained by fatigue test, the correlation of X-ray parameter and fracture mechanics parameter was determined and then the load applied to actual broken turbine blade was predicted.

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A Study on Development of Wind Power 400W Generation System with Vertical axis Type (400W 수직형 풍력발전시스템의 개발에 관한 연구)

  • Yoon, Jeong-Phil;Choi, Jang-Kyun;Cha, In-Su
    • New & Renewable Energy
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    • v.2 no.3
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    • pp.23-30
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    • 2006
  • Need developments of substitute energy to solve problem of global warming by excess use of fossil energy, excess discharge of carbon dioxide. wind power generation system is all-important energy in next generation as clean energy. Environmental pollution of wind power generation system is not exhausted entirely. And, electric-power generation system cost is cheap than other energy. Wind Generation system that is supplied much present is most horizontality style blade structure. But, Horizontal style structure is serious noise and there is problem in stability of blade. We designed special blade solve to this problem. And, manufactured vertical axis wind power generation system because using blade. Also, developed assistance power generator to increase driving efficiency ago wind power generation. We expect this devices that is such cover shortcoming of wind power generation system.

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Dynamic Analysis of a Rotating Blade Considering the Fluid Induced Exteral Force (유체유동에 의한 외력을 고려한 회전 블레이드의 동역학적 거동해석)

  • Seo, Seok;Yu, Hong-Hui;Yun, Jun-Yong
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.24 no.9 s.180
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    • pp.2259-2265
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    • 2000
  • A dynamic modeling of a rotating pretwist blade which interacts with the fluid is proposed in this study. The hybrid deformation variable modeling method is employed to derive the equations of motion. The external force and moment induced by the fluid (with fixed configurations of the blade) are obtained by fluid flow analysis and tabulated in a database. This database is efficiently utilized to save the computational effort to calculate the dynamic response of the blade. The numerical results show that the fluid affects the transient response as well as frequency characteristics of the system.

BLADE PLANFORM OPTIMIZATION FOR HSI NOISE REDUCTION OF HELICOPTER (헬리콥터의 고속충격소음 감소를 위한 블레이드 평면형상 최적화)

  • Chae, Sang-Hyun;Yang, Choong-Mo;Jung, Shin-Kyu;Aoyama, Takashi;Obayashi, Shigeru;Yee, Kwang-Jung
    • Journal of computational fluids engineering
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    • v.14 no.1
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    • pp.53-61
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    • 2009
  • The objective of this research is to design blade planform to reduce high speed impulsive(HSI) noise from a non-lifting helicopter rotor using CFD method and optimization techniques. As for the aero-acoustic analysis, CFD technique for aerodynamic analysis and Kirchhoff's method for the acoustic analysis were used. As for the optimization method, Kriging-based genetic algorithm(GA) model as a high-fidelity optimization method was chosen. Design variables and constraints are determined for arbitrary blade planform. The result shows that the optimized blade planform with high swept-back and taper ratio can reduce HSI noise by suppressing generation of the strong shock wave on blade surface and propagation of the noise to the farfield flow region.

Shape Optimization of Swept, Leaned, and Skewed Blades in a Transonic Axial Compressor for Enhancing Rotor Efficiency (효율 향상을 위한 축류 압축기 동익의 스윕, 린, 스큐각의 형상 최적화)

  • Jang, Choon-Man;Samad, Abdus;Kim, Kwang-Yong
    • 유체기계공업학회:학술대회논문집
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    • 2005.12a
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    • pp.525-532
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    • 2005
  • Shape optimization of a transonic axial compressor rotor operating at the design flow condition has been performed using response surface method and three-dimensional Navier-Stokes analysis. Three design variables of blade sweep. lean and skew are introduced to optimize the three-dimensional stacking line of the rotor blade. The object function of the shape optimization is selected as an adiabatic efficiency. Throughout the shape optimization of the rotor. the adiabatic efficiency is increased by reducing the tub comer and tip losses. Separation line due to the interference between a passage shock and surface boundary layer on the blade suction surface is moved downstream for the optimized blade compared to the reference one.

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