Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 50 for “"Rocket Motor"”.
-
Hybrid Rocket Motor Scaling Process
<p>Hybrid rocket propulsion technology shows promise for the next generation of sounding rockets and small launch vehicles. This paper seeks to provide details on the process of developing hybrid propulsion systems to the academic and amateur rocket communities to assist in future research and …
-
Aerospike Rocket Motor Structural Webbing
<p>A labscale hybrid rocket motor test stand has been developed for research at Cal Poly. The primary focus of research using this rig has been the development of regenerative cooling techniques using nitrous oxide as coolant and oxidizer, as well as validation of technologies relating to the …
-
Investigations into deep cracks in rocket motor propellant models
… design has been widely used in solid rocket applications for several decades. Although a large number of surface cracks are detected in the rocket motor propellants, the mechanism of these cracks is sull not well known due to the complex geometry of the grain. A stress-freezing …
-
Design Optimization Of Solid Rocket Motor Grains For Internal Ballistic Performance
… of optimization tools to the design of solid rocket motor grains per internal ballistic requirements. Research concentrated on the development of an optimization strategy capable of efficiently and consistently optimizing virtually an unlimited range of radial burning solid rocket motor grain …
-
Direct Numerical Simulation of Turbulence in a Model Solid Rocket Motor
The direct numerical simulation database is also used to make a priori estimates of the relative magnitudes of subgrid terms in the filtered evolution equations. It is found that in the equations for mean momentum and resolved scale Reynolds stress, the dominant subgrid terms are the subgrid stress …
-
Characterization of Shear Strengths and Microstructures for Solid Rocket Motor Insulation Materials
As advances in solid rocket technology push rocket motors to more extreme operating speeds and temperatures, it becomes increasingly important to have well-designed material systems capable of surviving these harsh conditions. One common component in these systems is the use of a fiber- and …
-
A parametric study on the contained burning of solid rocket motor propellant
Outmoded solid rocket motor propellant is being destroyed by burning as part of the worldwide demilitarization process. Many of these bums have been performed in spaces where the combustion products are contained within a sealed chamber. There is currently no accepted method to predict the gas …
-
Combustion of Single and Agglomerated Aluminum Particles in Solid Rocket Motor Flows
Lastly, a model was developed to describe the oxide cap accumulation on the droplet surface from the oxide smoke cloud surrounding the droplet. Results suggest that less oxide accumulates in high-pressure SRMs when considering mass burning rates for different relative cap sizes. The thermophoretic …
-
Manufacturing methods for a solid rocket motor propelling a small, fast flight vehicle
… around a long-endurance, end-burning solid rocket motor that provides 2-3 minutes of powered flight. Challenges exist for manufacturing solid rocket motors for small, fast aircraft such as Firefly. Achieving desired motor performance requires a void-free propellant grain and thermal liner …
-
Flow study of the nozzle region of the space shuttle solid rocket motor
… to analyze flow characteristics inside the solid rocket motor (SRM) used on the NASA space shuttle. The objective of this investigation was to determine whether the internal flow structure could adversely affect the nozzle/case joint and the surrounding casing. Also, it was hoped to learn more …
-
Experimental method of analyzing stress intensity factors and singularity order in rocket motor geometry
… of the maximum stress intensity factor for the motor grain test geometry.
-
Internal flow investigation of an aft finocyl grain configuration in a solid rocket motor
… about the nozzle region of a proposed solid rocket motor (SRM) configuration that would potentially replace the current external boosters on NASA's Space Shuttle. One-eighth-scale clear acrylic models of the proposed submerged aft-dome and aft finned grain elements were constructed to …
-
Flow field investigation in pulse 1 motor of a two-pulse solid rocket motor
… investigation of the flow field in the pulse I motor of a two-pulse solid rocket motor. A full scale model of clear acrylic material was constructed to allow direct visual access of the flow field. The experiment, which was conducted with one of the VPI water analogy rigs, simulated the flow in …
-
Modeling, and classical and advanced control of a solid rocket motor thrust vector control system
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1993.
-
Reduction Of Vortex-driven Oscillations In A Solid Rocket Motor Cold Flow Simulation Through Active Control
… airplane engine, controlled and powered by a DC motor. The use of open-loop only active control was not highly effective in reducing the amplitude of the first longitudinal acoustic mode, near 93 Hz, when the secondary injection was pulsed at the same modal frequency. This was due to the …
-
Design and Analysis of a Reusable N2O-Cooled Aerospike Nozzle for Labscale Hybrid Rocket Motor Testing
… lpoly.edu/cgi/ir_submit.cgi#_ftn1">[1]</a> hybrid rocket motor at Cal Poly-SLO.<a href="http://digitalcommons.calpoly.edu/cgi/ir_submit.cgi#_ftn2">[2]</a> The detailed design was based on the results of previous research involving cold-flow testing of annular aerospike nozzles and hot-flow testing …
-
The development and implementation of a hybrid rocket motor thrust stand to investigate the relationship between combustion chamber pressure and graphite rocket nozzle erosion in hybrid rocket motors
Rocket motors frequently implement carbon-based nozzle inserts to insulate the motor from the heat produced by combustion. Over time these inserts will erode due to oxidation at the surface wherein oxidizing species found in the combustion products react with the carbon to form carbon monoxide. It …
-
Stress analysis of rocket motors with viscoelastic propellant by a mixed finite element model
… semi-positive definite to positive definite. A rocket motor is composed of (1) case (2) propellant and (3) hollow air core and is modelled as an axisymmetric solid. The propellant of a rocket motor is treated as a viscoelastic material. Static and dynamic analyses are performed under (1) two …
-
Towards Electrical Control Over Rocket Propellant Combustion
… of various propulsion systems. In solid rocket motors, active burn rate modulation has the potential to enable throttling. In spacecraft propulsion systems, electrolysis of propellants may provide a means to reduce energy requirements and eliminate the need for expensive catalysts. The …
Page 1 of 3