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  • 1
    Digitale Medien
    Digitale Medien
    Nickel and High Nickel Alloys. Materials of Construction Review Condensed–Complete annotated bibliography for sale (1961)
    s.l. : American Chemical Society
    Industrial & engineering chemistry 53 (1961), S. 913-916 
    Details
    ISSN: 1520-5045
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ie50623a029
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    Artikel (Nationallizenzen)
    Volltext
  • 2
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    NLINEAR - NONLINEAR CURVE FITTING PROGRAM (1994)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-24
    Beschreibung: A common method for fitting data is a least-squares fit. In the least-squares method, a user-specified fitting function is utilized in such a way as to minimize the sum of the squares of distances between the data points and the fitting curve. The Nonlinear Curve Fitting Program, NLINEAR, is an interactive curve fitting routine based on a description of the quadratic expansion of the chi-squared statistic. NLINEAR utilizes a nonlinear optimization algorithm that calculates the best statistically weighted values of the parameters of the fitting function and the chi-square that is to be minimized. The inputs to the program are the mathematical form of the fitting function and the initial values of the parameters to be estimated. This approach provides the user with statistical information such as goodness of fit and estimated values of parameters that produce the highest degree of correlation between the experimental data and the mathematical model. In the mathematical formulation of the algorithm, the Taylor expansion of chi-square is first introduced, and justification for retaining only the first term are presented. From the expansion, a set of n simultaneous linear equations are derived, which are solved by matrix algebra. To achieve convergence, the algorithm requires meaningful initial estimates for the parameters of the fitting function. NLINEAR is written in Fortran 77 for execution on a CDC Cyber 750 under NOS 2.3. It has a central memory requirement of 5K 60 bit words. Optionally, graphical output of the fitting function can be plotted. Tektronix PLOT-10 routines are required for graphics. NLINEAR was developed in 1987.
    Schlagwort(e): STATISTICS AND PROBABILITY
    Materialart: LAR-13934
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    A parametric experimental study of the slotted-wall boundary condition (1978)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-22
    Beschreibung: An experimental study of slotted upper and lower walls in a two dimensional transonic wind tunnel with solid sidewalls is reported. Results are presented for several slot spacings and slot openness ratios. The experimental data were pressure measurements which were made on an airfoil model and on a sidewall near one of the slotted walls. The slotted-wall boundary condition coefficient, which related the pressure and streamline curvature near the wall, was determined from the wall pressure measurements. The measured wall-induced interference was correlated with the experimental values for the boundary condition coefficient. This correlation was compared with theory.
    Schlagwort(e): AERODYNAMICS
    Materialart: Advanced Technol. Airfoil Res., Vol. 1, Pt. 2; p 459-471
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Design and calibration of slotted walls for transonic airfoil wind tunnels (1979)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: The traditional procedure for estimating the performance of slotted walls for airfoil wind tunnels is reviewed, and a modification which improves the accuracy of this procedure is described. Unlike the traditional procedure, the modified procedure indicates that the design of airfoil wind-tunnel walls which induce minimal blockage and streamline-curvature effects is feasible. The design and testing of such a slotted wall is described. It is shown experimentally that the presence of a model can affect the plenum pressure and thus make the use of the plenum pressure as a calibration reference questionable. Finally, an ONERA experiment which shows the effect of the sidewall boundary layer on the measured model normal force is discussed.
    Schlagwort(e): AERODYNAMICS
    Materialart: Advanced Technol. Airfoil Res., Vol. 1, Pt. 1; p 433-443
    Format: application/pdf
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  • 5
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    A detailed experimental study of the flow in the vicinity of the slotted wall of a wind tunnel with applications to the homogeneous slotted-wall boundary condition (1986)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: The results of an experimental study of the flow in the vicinity of the slotted wall of a transonic wind tunnel are presented. A general description of the test setup and the wall configurations studied are given as are examples of the pressure data measured on the airfoil and the walls of the tunnel. The flow angles measured in the vicinity of the slot are examined with implications as to their use in the theory of homogeneous slotted walls. Preliminary values of the classical, homogeneous, slotted-wall boundary-condition coefficient are given and compared with theory.
    Schlagwort(e): AERODYNAMICS
    Materialart: AIAA PAPER 86-0749
    Format: text
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  • 6
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    FLEXWAL: A computer program for predicting the wall modifications for two-dimensional, solid, adaptive-wall tunnels (1983)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: A program called FLEXWAL for calculating wall modifications for solid, adaptive-wall wind tunnels is presented. The method used is the iterative technique of NASA TP-2081 and is applicable to subsonic and transonic test conditions. The program usage, program listing, and a sample case are given.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA-TM-84648 , NAS 1.15:84648
    Format: application/pdf
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  • 7
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    Potential flow through a cascade of alternately displaced circular bodies: The rod-wall wind tunnel boundary conditions (1984)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: The classic slotted-wall boundary-condition coefficient for rod-wall wind tunnels is derived by approximating the potential flow solution through a cascade of two staggered rows of rods. A comparison with the corrected Chen and Mears solution for flow through an unstaggered cascade is made.
    Schlagwort(e): AERODYNAMICS
    Materialart: NASA-TM-85750 , L-15617 , NAS 1.15:85750
    Format: application/pdf
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  • 8
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    A parametric experimental study of the interference effects and the boundary-condition coefficient of slotted wind-tunnel walls (1978)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: An experimental study of slotted upper and lower walls in a two-dimensional transonic wind tunnel with solid sidewalls is reported. Results are presented for several slot spacings and slot openness ratios. The experimental data are pressure measurements which were made on an airfoil model and on a sidewall near one of the slotted walls. The slotted-wall boundary-condition coefficient, which relates the pressure and streamline curvature near the wall, is determined from the wall pressure measurements. The measured wall-induced interference is correlated with the experimental values for the boundary-condition coefficient. This correlation is compared with theory.
    Schlagwort(e): RESEARCH AND SUPPORT FACILITIES (AIR)
    Materialart: AIAA PAPER 78-805 , Aerodynamic Testing Conference; Apr 19, 1978 - Apr 21, 1978; San Diego, CA
    Format: text
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  • 9
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    A method for modifying two-dimensional adaptive wind-tunnel walls including analytical and experimental verification (1983)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: The theoretical development of a simple and consistent method for removing the interference in adaptive-wall wind tunnels is reported. A Cauchy integral formulation of the velocities in an imaginary infinite extension of the real wind-tunnel flow is obtained and evaluated on a closed contour dividing the real and imaginary flow. The contour consists of the upper and lower effective wind-tunnel walls (wall plus boundary-layer displacement thickness) and upstream and downstream boundaries perpendicular to the axial tunnel flow. The resulting integral expressions for the streamwise and normal perturbation velocities on the contour are integrated by assuming a linear variation of the velocities between data-measurement stations along the contour. In an iterative process, the velocity components calculated on the upper and lower boundaries are then used to correct the shape of the wall to remove the interference. Convergence of the technique is shown numerically for the cases of a circular cylinder and a lifting and nonlifting NACA 0012 airfoil in incompressible flow. Experimental convergence at a transonic Mach number is demonstrated by using an NACA 0012 airfoil at zero lift.
    Schlagwort(e): RESEARCH AND SUPPORT FACILITIES (AIR)
    Materialart: NASA-TP-2081 , L-15491 , NAS 1.60:2081
    Format: application/pdf
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  • 10
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    Predicting Wall Modifications for Adaptive Wind Tunnels (1986)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-12
    Beschreibung: Wall shape changed iteratively until it matches streamlines. FLEXWAL predicts upper and lower wall modifications necessary to remove wall-interference effects in adaptive-wall wind tunnels. FLEXWAL aids in elimination of wall-interference effects on objects tested in typical two-dimensional wind tunnel with rigid sidewalls and flexible, solid floor and ceiling boundaries. Iterative procedure valid for subsonic and transonic test conditions, and convergence of method verified both analytically and experimentally. FLEXWAL written in FORTRAN IV for batch execution.
    Schlagwort(e): MACHINERY
    Materialart: LAR-13301 , NASA Tech Briefs (ISSN 0145-319X); 10; 2; P. 106
    Format: text
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