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 30 for “"Forebody"”.
-
Aerodynamics of a chined forebody oscillating in pitch
… pitching motion on the flowfield of a chined forebody has been performed. These tests were conducted in the University of Illinois low-speed (0-240 ft/sec), low-turbulence ($<$0.1%), 3 by 4 ft, open circuit wind tunnel. The high fidelity, NC machined aluminum model was sting mounted and …
-
High Angle of Attack Forebody Flow Physics and Design Emphasizing Directional Stability
… the fundamental physics of flowfields over forebody type shapes at low speed, high angle of attack conditions with special emphasis on sideslip has been established. Computational Fluid Dynamics (CFD) has been used to study flowfields over experimentally investigated forebodies: the Lament …
-
The effects of forebody strakes on asymmetric vortices on a vertically launched missile
… air missile model to investigate the effects of forebody stakes on the side forces and yawing moments induced by nose-generated asymmetric vortices at high angles of attack. The effects of body configuration and a turbulent flowfield on the induced side forces and yawing moments were also …
-
Numerical investigation of subsonic flow over bodies of revolution and a typical missile forebody
… to study the subsonic flow over a missile forebody. To this end, the NASA Ames developed OVERFLOW, three dimensional, Navier-Stokes Code was applied and detailed results were obtained for the missile forebody. The flow conditions were set at a Mach Number of 0.3 and Reynolds Number of two …
-
An experimental investigation of the forebody of a hypersonic inlet model and a comparison with theory
… of the flow field of a hypersonic inlet forebody model has been conducted in a Mach 4 airstream. Test section Reynolds number was approximately 6.6 X 10<sup>7</sup> per meter at a stagnation pressure of 13.6 atmospheres. The model consisted of two 8° wedges in the same plane and sloping …
-
Characterization of Onset and Transition to Instability in Supersonic Retropropulsion
… transition from steadiness to unsteadiness as forebody size, gas combination, and jet Mach number vary. The transition data taken at UW consisted of nozzle forebody diameters at 1/8 inch, 1/4 inch, and 3/8 inch nozzles at both Nitrogen-Nitrogen and Carbon Dioxide-Helium gas combinations, with …
-
Techniques for compressible flow calculations on multi-zone grids
… the turbulent flowüeld about 3-D analytic forebody is calculated as another test problem. Due to the poor results of the Baldwin-Lomax turbulent model for separated flows, only the attached flowtield is considered in the analytic forebody calculation. Finally, as applications of this …
-
Flow analysis and control in a subsonic inlet
… out at MIT, on the selected off-design case of forebody boundary layer ingestion. The first set of experiments focused on the characterization of the inlet in a clean configuration. Then, a distortion device was added in order to simulate thick forebody boundary layer. This proved to have a …
-
Reentry Vehicle Aerodynamics and Control at Very High Angle of Attack
… techniques were utilized to determine the forebody pressures and surface flowfield on the model. The effect of Reynolds number and boundary-layer state were also examined. The investigation suggests that the spinning under the drogue parachute was caused by asymmetric vortex formation. At …
-
The Dynamic Character of the Flow Over a 3.5 Caliber Tangent-Ogive Cylinder in Steady and Maneuvering States at High Incidence
… the time-averaged flow over a stationary slender forebody is generally well-understood. However, the nature of unsteady, time-varying flows over slender forebodies - whether due to the natural unsteadiness or forced maneuvering - is not well-understood. This body of work documents three …
-
The design of a surface launch and recovery fender for DSRV "Alvin"
… the uninflated vertical projected area of the forebody must increase. Large trim moments, due to the presence of the air bumper at the bow can be eliminated by use of a partially submerged bumper.
-
A general inverse design procedure for aerodynamic bodies
… A 3-D, viscous, compressible flow over a forebody/canopy model of a supersonic fighter and its comparison to test data establishes the ability of the method to solve practical problems of interest. Several other test cases are performed, including an axi-symmetric power law body and a 3-D …
-
The sensitivity equation method for optimal design
… problems. Finally. we solve a two dimensional forebody simulator design problem (for use in wind tunnel experiments) using the SEM, which is shown to be a very efficient method for this problem.
-
Generalized spatial discretization techniques for space-marching algorithms
… the high speed flow about a 5° cone, an analytic forebody, and a model SR71 aircraft.
-
Continuum breakdown assessment and state-based transport modeling for non-equilibrium hypersonic flows
… tensor components - are identified within the forebody region of a Mach 24 airflow past a sphere. Regions of non-continuum were observed in the shock, and close to the sphere surface. The flowfield near the surface was found to be characterized by sharp species concentration gradients due to …
-
Characteristics of the High Speed Gas-Liquid Interface
… of a vortex ring. Nuclei are shed from the forebody of the accelerating projectile and are entrained in the vortex ring core where they are subjected to low pressure and subsequently expand rapidly. A characteristic time scale for this supercavity development is presented.
-
Assessment of moving-mass actuators for hypersonic vehicles with deployable decelerators
… is modeled as a cylinder with a deployable forebody and a moving-mass actuator that can translate along a linear track. Placing the track in the rear of the vehicle can reduce the required actuator mass fraction for a specific trim lift-to-drag ratio by up to 5%. Increasing the length of the …
-
Slender elastic swimmers : kinematics, dynamics, and robotic applications
… uses a single actuator, housed within a rigid forebody, to generate a fish-like propagating wave along a flexible trailing tail. A number of groups have explored this approach, but so far, these devices have demonstrated relatively limited performance. Here, we study the kinematics and dynamics …
-
Entry, descent and landing vehicle design space exploration for crewed Mars missions
… of a reference EDL vehicle with a spherical forebody and a conical aftbody was also evaluated.
-
Unstructured technology for high speed flow simulations
… technique are presented for an analytic forebody.
Page 1 of 2