Messungen im turbulenten Nachlauf des Einzelzylinders

Pfeil, H.; Eifler, Jürgen

doi:10.1007/bf02560792

Cited by 18 publications

(8 citation statements)

References 3 publications

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“…In the past, bar diameters of 1.5 mm and 3 mm were used, but our interest was concentrated on the 1.5 mm bars because in this case the drag and the size of the wake corresponds well with a frequently studied airfoil (Wittig et al, 1988 ) . The results concerning the wake width obtained from a large number of different test conditions were compared with measurements and correlations published by Reichardt (1942), Schlichting (1982), Pfeil and Eifler (1975) or Van Dresar (1987a) which were derived from measurements in the wake of fixed cylinders in cross-flow. In contrast, we have been performing our measurements with a fixed hot-wire recording a moving wake that passes the probe location.…”

Section: V[%]mentioning

confidence: 97%

“…Eq. 7was used by Schlichting (1982) and Van Dresar (1987a) to compare with their own measurements and the data of Reichardt (1942), whereas Pfeil and Eifler (1975) used eq. (8) to fit their measurements for x/d < 100.…”

Section: Figure 10: Wake Quantitiesmentioning

confidence: 99%

“…Complementary to the heat-transfer measurements hot-wire measurements were conducted to monitor the characteristics of the wake flow entering the cascade. These measurements were compared to published correlations (Schlichting 1982, Pfeil et al 1975, Van Dresar 1987a in order to validate the applicability of steady state results for a cylinder in cross-flow.…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Incident Wake Conditions on the Mean Heat Transfer of an Airfoil

Dullenkopf

Schulz

Wittig

1991

Journal of Turbomachinery

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The flow phenomena of wakes shed by upstream blade rows is a well-known problem in turbomachinery, which influences blade forces, vibrations, losses, and heat transfer. With respect to the heat load to turbine blades, this problem becomes even more complex because of the interaction between wake, potential flow, and the boundary layer along the surface of the airfoil. Experimentally evaluated mean heat transfer coefficients obtained under different unsteady initial conditions are reported. The heat transfer measurements have been carried out in the cascade test facility at the ITS in Karlsruhe, using a rotating bar wake generator placed upstream of the cascade to simulate the wake passing process. The variation of the wake parameters includes different wake passing frequencies, cascade inlet Reynolds numbers, and wake inclination angles. In addition, the relevant parameters of the unsteady wake have been measured by means of a fixed hot-wire anemometer using the ensemble-average technique. The results are compared to those from the literature for the wake of a cylinder in crossflow. They also serve as experimental base for parallel theoretical analyses.

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Section: V[%]mentioning

confidence: 97%

Section: Figure 10: Wake Quantitiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Effect of Incident Wake Conditions on the Mean Heat Transfer of an Airfoil

Dullenkopf

Schulz

Wittig

1991

Journal of Turbomachinery

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“…Pfeil et al [3] considered that the wake structure of cylinder is equal to that of blade by the same drag coefficiency. The expression can be written by:…”

Section: Experiments Equipment and Turbine Stator Profilementioning

confidence: 99%

Experiment on the secondary flow of a large turn angle turbine stator with a rotating single slanted hotwire

Ming

2009

J. Shanghai Jiaotong Univ. (Sci.)

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Experiment measurement is adapted to study the secondary flow of turbine. The subsonic stator experiment flow tunnel is set up. Two different inlet velocities and three different stator heights are applied. The method of a rotating slanted hotwire is introduced to measure the stator outlet three-dimensional flow field. The procedure for solving the mean three-dimensional velocity component involving the least-squares technique can be accomplished via the LSQNONLIN optimization function of Matlab. Under different work conditions, the stator outlet secondary flow is more intense at higher inlet flux. Moreover, the shortest stator height will lead to the most intense secondary flow, which gains the largest axial velocity component (w) and radial velocity component (u), but the smallest circumferential velocity component (v).

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“…In this case, self similarity in the velocity distribution appears at a distance of a/d -100. The turbulence structure shows a linear relation between the u-and v-component down to a/d -10, but if a/d is reduced furthermore the v-component increases drastically (Pfeil et al, 1975). The investigations of the velocity and turbulence profiles in the wake of the airfoil and the cylinder were conducted by using a LDV-system already described by Wittig et al (1986).…”

Section: Grid 23mmentioning

confidence: 99%

Effects of Free-Stream Turbulence and Wake Characteristics on the Heat Transfer Along a Cooled Gas Turbine Blade

Wittig

Schulz

Dullenkopf

et al. 1988

Volume 4: Heat Transfer; Electric Power; Industrial and Cogeneration

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Heat transfer measurements under steady, quasi-steady and unsteady flow conditions are discussed. In continuing measurements on the influence of a plane steady wake flow as well as on the effects of grid-produced free-stream turbulence, the present paper describes the effects of the superposition of the free-stream turbulence with the wake flow. Of special interest is a comparison of the wake produced by a leading airfoil with that of a cylindrical bar in cross flow. The similarity of the wakes as far as macrostructure of the turbulence and velocity is concerned is documented using LDV and heat transfer measurements. In extending the modeling concept, a rotating wake generator is employed simulating the wake of a blade with cylindrical bars in cross flow. The comparison of the theoretical and experimental results is presented.

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Messungen im turbulenten Nachlauf des Einzelzylinders

Cited by 18 publications

References 3 publications

The Effect of Incident Wake Conditions on the Mean Heat Transfer of an Airfoil

The Effect of Incident Wake Conditions on the Mean Heat Transfer of an Airfoil

Experiment on the secondary flow of a large turn angle turbine stator with a rotating single slanted hotwire

Effects of Free-Stream Turbulence and Wake Characteristics on the Heat Transfer Along a Cooled Gas Turbine Blade

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