Three-dimensional Delta/Thor launch vehicle analysis including main engine plume

Time-averaged Stanton number and surface-pressure distributions are reported for the first-stage vane row and the first-stage blade row of the Rocketdyne Space Shuttle Main Engine two-stage fuel-side turbine. These measurements were made at 10, 50, and 90 percent span on both the pressure and suction surfaces of the component. Stanton-number distributions are also reported for the second-stage vane at 50 percent span. A shock tube is used as a short-duration source of heated and pressurized air to which the turbine is subjected. Platinum thin-film gages are used to obtain the heat-flux measurements and miniature silicone-diaphragm pressure transducers are used to obtain the surface pressure measurements. The first-stage vane Stanton number distributions are compared with predictions obtained using a quasi-three dimensional Navier–Stokes solution and a version of STAN5. This same N–S technique was also used to obtain predictions for the first blade and the second vane.

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Numerical Simulation of the Added Mass of the Fluid Adjacent to the Ship Hull in Vibration Measured During Sea-Trials in Tanker Ships to be Converted to Offshore Construction Vessel

Volume 4: Offshore Geotechnics; Ronald W. Yeung Honoring Symposium on Offshore and Ship Hydrodynamics ◽

10.1115/omae2012-83964 ◽

2012 ◽

Author(s):

Severino Fonseca Silva Neto ◽

Silvia Ramscheid Figueiredo ◽

Marta Cecilia Tapia Reyes ◽

Luiza de Mesquita Ortiz

Keyword(s):

Numerical Model ◽

Kinetic Energy ◽

Natural Frequencies ◽

Three Dimensional ◽

Added Mass ◽

Vertical Vibration ◽

Full Scale ◽

Experimental Results ◽

Vibration Velocity ◽

Main Engine

This study aims to analyze the influence of the kinetic energy of the fluid adjacent to the hull of a tanker ship in its vertical vibration frequencies, comparing them with experimental measurements obtained during sea-trials. The one-dimensional modeling of ships allows the construction of simple finite element models from the structural elements of its master section, with structural and added masses, and their frequencies are verified by full-scale measurements, during the sea-trials. The numerical results of these models, with the value of the effective shear area as a fraction of the total area of the strength steel are compared to those obtained in full-scale measurements during sea trials of an oil tanker to be converted to Offshore Construction Vessel. Global vibration measurements were carried out in two of the six ships with the same hull. Accelerometers were installed in eleven strategic points of each hull. Vibration data acquisition was performed simultaneously for these locals in thirteen rotations of the main engine. The amplitude spectra of vibration velocity on the frequency range of measurements were obtained and were plotted graphs of the evolution of the main harmonics, depending on the rotation of the main engine, in order to identify four natural frequencies of the overall vibration of the hull, which were compared to the numerical model. The calculation is performed by the added mass formulations from Burrill, Todd, Kumay and Lewis/Landweber [8] curves, including in all three-dimensional effect by Townsin [17] coefficients, which is checked against the experimental results. The comparison between numerical and experimental results allows assessing the influence of the kinetic energy of the fluid surrounding the hull in the natural frequencies of vibration of the numerical model of the tanker ship and simulating their dynamic behavior after conversion in Offshore Construction Vessel.

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Numerical analysis of the three-dimensional flow in the main injector assembly of the Space Shuttle Main Engine

10.2514/6.1986-1422 ◽

1986 ◽

Cited By ~ 1

Author(s):

T. MUKERJEE ◽

A. PRZKEWAS ◽

R. HOLLAND ◽

N. COSTES

Keyword(s):

Numerical Analysis ◽

Space Shuttle ◽

Three Dimensional ◽

Three Dimensional Flow ◽

Dimensional Flow ◽

Main Engine

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Deflecting Features of Gas from Double-Faced Deflector and Structure Optimization of Deflector

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.387.314 ◽

2013 ◽

Vol 387 ◽

pp. 314-318 ◽

Cited By ~ 1

Author(s):

Shao Yan Shi ◽

Yi Jiang ◽

Xiao Tong Dong

Keyword(s):

Gas Flow ◽

Three Dimensional ◽

Structure Optimization ◽

Launch Vehicle ◽

Gas Jet ◽

Dynamical Simulation

This paper uses three-dimensional dynamical simulation of gas jet to demonstrate basic deflecting features of the double-faced deflector, during the launch process of the land-based missile with the vehicle-mounted vertically thermal launch. The calculation shows that the deflection of the gas flow is good, reducing knock-on effect and ablative effect on launch device. But wheels of the launch vehicle are still under visible influent from the gas flow. The paper optimizes the double-faced deflector and compares different suggestions in order to find a better deflection.

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