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  • Fluid Mechanics and Thermodynamics  (8)
  • Structural Mechanics
  • 1990-1994
  • 1945-1949  (13)
  • 1948  (7)
  • 1946  (6)
  • 1
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    Shear Lag in a Plywood Sheet-stringer Combination Used for the Chord Member of a Box Beam (1948)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Theoretical and experimental investigations were made of the distribution of strains in a plywood sheet-stringer combination used as the chord member of a box beam acted upon by bending loads. The theoretical solution was obtained with the help of the principle of minimum potential energy and certain simplifying assumptions. Strain measurements were made on a build-up box beam by means of electrical-resistance strain gages connected with strain indicators. A very satisfactory agreement between the theoretical and experimental strains was obtained.
    Keywords: Structural Mechanics
    Type: NACA-TN-1443
    Format: application/pdf
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  • 2
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    Vibration Survey of Blades in 19XB Axial-Flow Compressor (1948)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: Strain gages were used to measure blade vibrations possibly causing failure in the 10-stage compressor of the 19XB jet-propulsion engine. The seventh and tenth stages were of great concern as a result of failures experienced by the manufacturer. Strain-gage records were obtained from all stages during acceleration, deceleration, and constant speed runs. Curves are presented herein showing the maximum allowable vibratory stress for a given speed, the change of the damping coefficient with the mounting of a strain gage at the base of the blade, the effect of rotor speed, on blade natural frequency, and the effect of the order of first bending-mode vibration on stress. It was found that for all stages the lower the order of vibration the higher the stress but no destructive vibrations were detected.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NACA-RM-SE8A28
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  • 3
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    Rotating Disks in the Region of Permanent Deformation (1948)
    In:  CASI
    Details
    Publication Date: 2019-08-15
    Description: This technical memorandum is a mathematical investigation of the problem of overspeeded disks. New methods must be sought for obtaining a satisfactory stress equalization in the cross section of these disks.
    Keywords: Structural Mechanics
    Type: NACA-TM-1192 , Zeitschrift fuer Angewandte Mathematik und Mechanik, Ingenieurwissenschaftliche Forschungsarbeiten; 5; 4; 281-293
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  • 4
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    NACA Conference on Turbojet-Engine Thrust Augmentation Research: A Compilation of the Papers Presented by NACA Staff Members (1948)
    In:  CASI
    Details
    Publication Date: 2019-08-14
    Description: The conference on Turbojet-Engine Thrust-Augmentation Research was organized by the NACA to present in summarized form the results of the latest experimental and analytical investigations conducted at the Lewis Flight Propulsion Laboratory on methods of augmenting the thrust of turbojet engines. The technical discussions are reproduced herewith in the same form in which they were presented. The original presentation in this record are considered as complementary to, rather than substitutes for, the committee's system of complete and formal reports.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NACA Conference on Turbojet-Engine Thrust - Augmentation Research; Oct 28, 1948; Cleveland, OH; United States
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  • 5
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    Theoretical Analysis of Stationary Potential Flows and Boundary Layers at High Speed (1948)
    In:  CASI
    Details
    Publication Date: 2019-07-11
    Description: The present report consists of two parts. The first part deals with the two-dimensional stationary flow in the presence of local supersonic zones. A numerical method of integration of the equation of gas dynamics is developed. Proceeding from solutions at great distance from the body the flow pattern is calculated step by step. Accordingly the related body form is obtained at the end of the calculation. The second part treats the relationship between the displacement thickness of laminar and turbulent boundary layers and the pressure distribution at high speeds. The stability of the boundary layer is investigated, resulting in basic differences in the behavior of subsonic and supersonic flows. Lastly, the decisive importance of the boundary layer for the pressure distribution, particularly for thin profiles, is demonstrated.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NACA-TM-1189 , Lilienthal-Gesellschaft fuer Luftfahrtforschung Bericht S13/1 Teil; 7-24
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  • 6
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    Tests of the AN/SPS-1 Radar Antenna in the Langley Full-Scale Tunnel (1948)
    In:  CASI
    Details
    Publication Date: 2019-07-11
    Description: Tests have been conducted to determine the drive-motor torque and the static force and moment characteristics of the AN/SPS-1 radar antenna. Shifting the longitudinal position of the antenna had very little effect on the drive-motor torque, which reached a maximum value expressed in terms of dynamic pressure (T/q)(sub max) of 1.15 at an azimuth angle of 245 deg. The maximum observed values of rolling, pitching, and yawing moments in terms of dynamic pressure are -29.0, 66.6, and 13.4, respectively.
    Keywords: Structural Mechanics
    Type: NACA-RM-SL7L02
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  • 7
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    Nonstationary Gas Flow in Thin Pipes of Variable Cross Section (1948)
    In:  CASI
    Details
    Publication Date: 2019-08-16
    Description: Characteristic methods for nonstationary flows have been published only for the special case of the isentropic flow up until the present, althought they are applicable in various places to more difficult questions too. This report derives the characteristic method for the flows which depend only on the position coordinates and time. At the same time the treatment of compression shocks is shown.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NACA-TM-1196 , Zentrale fuer Wissenschaftliches Berichtswesen der Luftfahrtforschung des Generalluftzeugmeisters (ZWB); 1744
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  • 8
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    The Lagrangian Multiplier Method of Finding Upper and Lower Limits to Critical Stresses of Clamped Plates (1946)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The theory of Lagrangian multipliers is applied to the problem of finding both upper and lower limits to the true compressive buckling stress of a clamped rectangular plate. The upper and lower limits thus bracket the truss, which cannot be exactly found by the differential-equation approach. The procedure for obtaining the upper limit, which is believed to be new, presents certain advantages over the classical Raleigh-Rite method of finding upper limits. The theory of the lower-limit procedure has been given by Trefftz but, in the present application, the method differs from that of Trefftz in a way that makes it inherently more quickly convergent. It is expected that in other buckling problems and in some vibration problems problems the Lagrangian multiplier method finding upper and lower limits may be advantageously applied to the calculation of buckling stresses and natural frequencies.
    Keywords: Structural Mechanics
    Type: AD-A301132 , NACA-TR-848 , NASA-TM-111368 , NAS 1.15:111368
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  • 9
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    Investigation of the Behavior of Thin-Walled Panels with Cutouts (1946)
    In:  CASI
    Details
    Publication Date: 2019-08-17
    Description: The present paper deals with the computation and methods of reinforcement of stiffened panels with cutouts under bending loads such as are applied to the sides of a fuselage. A comparison is maade between the computed and test results. Results are presented of tests on panels with cutouts under tensile and compressive loads.
    Keywords: Structural Mechanics
    Type: NACA-TM-1094 , ; 454
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  • 10
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    Investigation of Flow in a Centrifugal Pump (1946)
    In:  CASI
    Details
    Publication Date: 2019-08-16
    Description: The investigation of the flow in a centrifugal pump indicated that the flow patterns in frictional fluid are fundamentally different from those in frictionless fluid. In particular, the dead air space adhering to the section side undoubtedly causes a reduction of the theoretically possible delivery head. The velocity distribution over a parallel circle is also subjected to a noticeable change as a result of the incomplete filling of the passages. The relative velocity on the pressure side of the vane, which for passages completely filled with active flow would differ little from zero even at comparatively lower than normal delivery volume, is increased, so that no rapid reverse flow occurs on the pressure side of the vane even for smaller delivery volume. It was established, further, that the flow ceases to be stationary for very small quantities of water. The inflow to the impeller can be regarded as radial for the operating range an question. The velocity triangles at the exit are subjected to a significant alteration in shape ae a result of the increased peripheral velocity, which may be of particular importance in the determination of the guide vane entrance angle.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NACA-TM-1089 , Mitteilungen des Hydraulischen Instituts der Technischen Hochschule; 4; 1-27
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  • 11
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    An Analytical Investigation of the Heat Losses from a U.S. Navy K-Type Airship (1946)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: The heat losses from the envelope surface of a U.S. Navy K-type airship are evaluated to determine if the use of heat is a feasible means of preventing ice and snow accumulations on lighter-than-air craft during flight and when moored uncovered. Consideration is given to heat losses in clear air (no liquid water present in the atmosphere) and in probable conditions of icing and snow. The results of the analysis indicate that the amount of heat required in flight to raise the surface temperature of the entire envelope to the extent considered adequate for ice protection, based on experience with tests of heavier-than-air craft, is very large. Existing types of heating equipment which could be used to supply this quantity of heat would probably be too bulky and heavy to provide a practical flight installation. The heat requirements to provide protection for the nose and stern regions in assumed mild to moderate icing conditions appear to be within the range of the capacity of current types of heating equipment suitable for flight use. The amount of heat necessary to prevent snow accumulations on the upper surface of the airship envelope when moored uncovered under all conditions appear to be excessive for the heating equipment presently available for flight use, but could possibly be achieved with auxiliary ground heating equipment.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NACA-RM-SA6L20
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  • 12
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    Investigation of Turbulent Mixing Processes (1946)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: With water as driving medium and delivered medium in a device similar to a simple jet apparatus, the pressure and velocity fields of the mixing zone were explored with a pitot bar; the ratio of delivered to driving volume ranged between the values 0, 1, 2, and 4. An attempt was also made to analyze the mixing flow mathematically by integration of the equation of motion, with the aid of conventional formulas for the turbulent shearing stress, but this succeeded only approximately for the very simplified case that a driving jet is introduced in an unlimited parallel flow, while the pressure over the whole mixing field is assumed to be constant. In spite of these dissimilar assumptions for the theory and the experiment, the form of the measured and the computed velocity profiles indicates a very high degree of approximation. The pressure rise, which was approximated by Flugel's formulas, disclosed good agreement with the measured values.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NACA-TM-1096 , Forschung auf dem Gebiete des Ingenieurwesens; 12; 1; 16-30
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  • 13
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    Flow Investigation with the Aid of the Ultramicroscope (1946)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: On the basis of photographic pictures the laminar flow at a pipe inlet was measured and compared with other measurements and computational results. The test setup is described in detail, and a series of the pictures obtained for turbulent flow is given.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: NACA-TM-1109 , Forschung auf dem Gebiete des Ingenieurwesens; 8; Pt 1; 42-47
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