Particle trajectories near an airfoil with a film-cooled leading edge

Suo, M.; Patrick, William P.; Johnson, B. V.

doi:10.2514/3.47995

Cited by 3 publications

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References 4 publications

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“…The experiment is discussed in detail in a companion paper 11 and hence it will only be described briefly in the present work. The airfoil used in the comparison was a simple symmetric airfoil with a blunt circular leading edge.…”

Section: Resultsmentioning

confidence: 99%

Particle trajectories in turbine cascades

1979

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An analytical investigation into the nature of particle trajectories in cascades of airfoils has been carried out in order to predict the location, velocity, and angle of particle impact on the airfoils of turbines. As a result of this analysis it has been shown that for any given inviscid flow, particle trajectories are uniquely determined by the specification of only two dimensionless parameters, the most important of which is the Stokes number. In addition, computed results have indicated that particle trajectories are virtually invariant with cascade Mach number. Finally, a comparison of analytically and experimentally determined trajectories for the flow around the circular leading edge of a blunt body has shown excellent agreement over a wide range of Stokes number. Nomenclature A c = particle frontal area b x -cascade airfoil axial chord C D = particle drag coefficient D = blunt-body leading edge diameter D p = particle diameter M = Mach number Re b = airfoil inlet Reynolds number = -p f VD Re = particle Reynolds number = ----M 5 = airfoil surface arc length p U,D 2 St = Stokes number = p p U= fluid velocity vector V = particle velocity vector relative to fluid v = particle volume X -particle position vector X = particle velocity vector X = particle acceleration vector ft = gas flow angle (from tangential) 7 = specific heat ratio = C p /C v p = density /A = absolute viscosity r = cascade pitch Subscripts f = fluid p = particle / = cascade inlet conditions 2 = cascade exit conditions Superscripts (' ) = derivatives with respect to time ("* ) = vector ( ~ ) =nondimensional

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Section: Resultsmentioning

confidence: 99%

Particle trajectories in turbine cascades

1979

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Heat transfer—A review of 1979 literature

Eckert

Sparrow

Goldstein

et al. 1981

International Journal of Heat and Mass Transfer

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Turbine Airfoil Leading Edge Film Cooling Bibliography: 1972–1998

Kercher

1999

International Journal of Rotating Machinery

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Film cooling for turbine airfoil leading edges has been a common practice for at least 35 years as turbine inlet gas temperatures and pressures have continually increased along with cooling air temperatures for higher engine cycle efficiency. With substantial engine cycle performance improvements from higher gas temperatures, it has become increasingly necessary to film cool nozzle and rotor blade leading edges since external heat transfer coefficients and thus heat load are the highest in this airfoil region. Optimum cooling air requirements in this harsh environment has prompted a significant number of film cooling investigations and analytical studies reported over the past 25 years from academia, industry and government agencies. Substantial progress has been made in understanding the complex nature of leading edge film cooling from airfoil cascades, simulated airfoil leading edges and environment. This bibliography is a report of the open-literature references available which provide information on the complex aero-thermo interaction of leading edge gaseous film cooling with mainstream flow. From much of this investigative information has come successful operational leading edge film cooling design systems capable of sustaining airfoil leading edge durability in very hostile turbine environments.

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Particle trajectories near an airfoil with a film-cooled leading edge

Cited by 3 publications

References 4 publications

Particle trajectories in turbine cascades

Particle trajectories in turbine cascades

Heat transfer—A review of 1979 literature

Turbine Airfoil Leading Edge Film Cooling Bibliography: 1972–1998

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