Aerospace & Aviation

A distributed parameter model for computing unsteady flow conditions in liquid systems is presented. The model is adapted for use in conjunction with a digital computer. The analytical method employed is essentially a solution synthesized from the effects of incremental step pressure pulses. The pressure pulses are generated because of incremental flow-rate changes that originate in a fluid system from a variety of sources, including the mechanical motion of the system structure. The pressure pulses propagate throughout the system at sonic velocity and are partially transmitted and reflected at each discontinuity. The velocity change caused by each pressure pulse is obtained from the relation for the characteristic acoustic impedance. Pressure and velocity time histories at any point in the system are obtained by a timewise summation of the contributions of the incremental pressure pulses passing that point. The analysis is presented in a form general enough to be applied to a variety of liquid-filled fluid systems. To illustrate the application of the method to a specific system, the response of a long, straight propellant line to a sinusoidal inlet flow and pressure perturbation is computed. Both a constant-cross-section line and a tapered line are analyzed in the example.

Effect of suprathreshold value of Coriolis acceleration on pilot of flight simulator - reference to perception of illusory motion and position in space

Fabry-Perot interferometer investigations for techniques of millimeter wave measurements and accurate attenuation

Celestial navigation design for enabling astronaut to determine location of orbiting Gemini spacecraft by visual comparison of actual star field to representation on device

Digital logic circuits for space vehicle logic systems for application in nonspace computer systems

Computer program for calculation of liquid metal condensing heat transfer coefficients inside tubes

Second Pegasus meteoroid satellite launching by NASA

Multistage axial flow compressor stalling characteristics and blade vibration

Charts for solution of radial distribution flow equations used in axial flow compressor design

Potential flow theory for two-dimensional cascades, and application to fluid flow through axial flow compressors

This first chapter of a report on the aerodynamic design of axial-flow compressors presents the general objectives and scope of the over-all report. The basic problem of compressor design is outlined, and the approach generally taken to accomplish its solution is pointed out. The sixteen succeeding chapters in the report are summarized.

Mechanical properties of cross linked polymethyl methacrylate polymers in space environment - tensile stress-strain data, and stress relaxation and swelling measurements

Space instrument systems to measure and obtain engineering, scientific, and medical data in fields of aeronautics, atmospheric structure, solar observation, and lunar exploration

Laser beacon for daylight optical tracking - components description, signal to noise ratio, and signal sensitivity

Analysis of Ranger V tracking performance, preflight and postflight results, tracking data, oscillographs, station reports, and calibrations