scholarly journals SNAP-50/SPUR NUCLEAR TEST FACILITY INITIAL DESIGN REQUIREMENTS, CANEL SITE, MIDDLETOWN, CONNECTICUT

1964 ◽  
Author(s):  
Not Given Author
Keyword(s):  
Nuclear Test ◽  
Test Facility ◽  
Initial Design ◽  
Design Requirements

Design and Testing of a Can Combustor for a Small Gas Turbine Application

2013 ◽  
Author(s):  
K. V. L. Narayana Rao ◽  
N. Ravi Kumar ◽  
G. Ramesha ◽  
M. Devathathan
Keyword(s):  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Gas Turbines ◽  
Pressure Loss ◽  
High Energy ◽  
Experimental Results ◽  
High Mass ◽  
Test Facility ◽  
Design Requirements

Can type combustors are robust, with ease of design, manufacturing and testing. They are extensively used in industrial gas turbines and aero engines. This paper is mainly based on the work carried out in designing and testing a can type combustion chamber which is operated using JET-A1 fuel. Based on the design requirements, the combustor is designed, fabricated and tested. The experimental results are analysed and compared with the design requirements. The basic dimensions of the combustor, like casing diameter, liner diameter, liner length and liner hole distribution are estimated through a proprietary developed code. An axial flow air swirler with 8 vanes and vane angle of 45 degree is designed to create a re-circulation zone for stabilizing the flame. The Monarch 4.0 GPH fuel nozzle with a cone angle of 80 degree is used. The igniter used is a high energy igniter with ignition energy of 2J and 60 sparks per minute. The combustor is modelled, meshed and analysed using the commercially available ansys-cfx code. The geometry of the combustor is modified iteratively based on the CFD results to meet the design requirements such as pressure loss and pattern factor. The combustor is fabricated using Ni-75 sheet of 1 mm thickness. A small combustor test facility is established. The combustor rig is tested for 50 Hours. The experimental results showed a blow-out phenomenon while the mass flow rate through the combustor is increased beyond a limit. Further through CFD analysis one of the cause for early blow out is identified to be a high mass flow rate through the swirler. The swirler area is partially blocked and many configurations are analysed. The optimum configuration is selected based on the flame position in the primary zone. The change in swirler area is implemented in the test model and further testing is carried out. The experimental results showed that the blow-out limit of the combustor is increased to a good extent. Hence the effect of swirler flow rate on recirculation zone length and flame blow out is also studied and presented. The experimental results showed that the pressure loss and pattern factor are in agreement with the design requirements.

scholarly journals Satellite radar observation of large surface collapses induced by the 2017 North Korea nuclear test

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Won-Kyung Baek ◽  
Hyung-Sup Jung ◽  
Tae Sung Kim
Keyword(s):  
North Korea ◽  
Surface Deformation ◽  
Complex Surface ◽  
Nuclear Test ◽  
Test Facility ◽  
Deformation Pattern ◽  
Vertical Deformation ◽  
Horizontal Deformation ◽  
Maximum Deformation ◽  
The North

Abstract The artificial earthquake of mb 6.1 related to the North Korea’s sixth nuclear test occured at Mt. Mantap, North Korea on September 3, 2017. It was reported that a large and complex surface deformation was caused by the event. The surface deformation was composed of expansion of explosions, collapse, compaction and landslides. Since the precise vertical deformation measurement is very important to estimate the stability of the nuclear test facility, we retrieved a precise 3D surface deformation field and then decomposed the vertical deformation pattern from the 3D deformation. The measured maximum deformation was about − 491, − 343 and 166 cm with the measurement uncertainty of about 3.3, 4.1 and 2.7 cm in the east, north and up directions, respectively. The maximum horizontal deformation was approximately 515 cm. The horizontal deformation clearly showed a radial pattern because it was mainly caused by the explosions and landslides, while the vertical deformation displayed a rugged pattern because it was affected by the explosions, compaction and collapse. The collapse may seem to occur along the underground tunnels and at the test site’s epicenter as well. Moreover, the severe collapse was observed westside from the epicenter of the sixth nuclear test, and it has a depth of about 68.6 cm on the area of 0.3765 km2. On the basis of our results including the shapes, locations and volume changes of the large collapse, evidently a new vital piece of information was obtained so that it could be used to interprete the sixth nuclear test more accurately.

Numerical Simulations of Vertical-Axis Wind Turbine Blades

2011 ◽  
Author(s):  
B. D. Plourde ◽  
J. P. Abraham ◽  
G. S. Mowry ◽  
W. J. Minkowycz
Keyword(s):  
Wind Tunnel ◽  
Numerical Simulations ◽  
Large Scale ◽  
Turbine Blades ◽  
Vertical Axis ◽  
Test Facility ◽  
Wing Design ◽  
In Situ Tests ◽  
Initial Design

A recent research project has been focused on the design, manufacture, and testing of novel, vertical-axis turbines which can be directly attached to existing structures (such as communication towers) for local power generation, particularly in areas of the world where grid-connected electricity is unavailable. The proposed turbine has undergone a multitude of design stages, including the wing design, prototype fabrication, wind-tunnel testing, and manufacture. This report discusses the initial design process utilized to create the turbine wing. That process relied upon numerical simulations of the unsteady flow patterns which occur when the wing rotates. Results from the simulation were used to modify the wing design and significant improvements in performance were realized. Based on wind-tunnel tests, improvements on the order of 300% were obtained, compared to the initial design. Improvements of this magnitude have allowed the progression from prototype testing to large-scale manufacturing. The simulations allowed the implementation of novel design features such as preferentially deployed vents which allowed an increase of torque and a decrease of transverse loads. Results from the simulation were compared with experimental results obtained from a wind-tunnel test. In addition, data was extracted from an in situ test facility which was installed with wind-speed and data acquisition equipment. It was found that the results of the simulation were in close agreement with both the results from the wind tunnel and the in situ tests. The congruence gave added confidence to the veracity of the simulations.

LGA Connectors: An Automated Design Technique for a Shrinking Design Space

2000 ◽  
Vol 122 (3) ◽  
pp. 247-254 ◽  
Author(s):  
A. Deshpande ◽  
G. Subbarayan
Keyword(s):  
Finite Element ◽  
Nonlinear Optimization ◽  
Optimization Problem ◽  
Design Procedure ◽  
Automated Design ◽  
Optimization Techniques ◽  
Circuit Board ◽  
Element Analysis ◽  
Initial Design ◽  
Design Requirements

The ever-increasing demand for higher-density interconnection between a multi-chip module and the printed circuit board has resulted in the emergence of Land-Grid Array (LGA) connectors as an alternative to the traditional pin and socket area-array connectors. The design of high-density land-grid array connectors involves trade-off between conflicting performance requirements on the normal force, wipe, bulk resistance, contact resistance, stress, contact z-dimensional thickness, and z-compression. These stringent design requirements have significantly shrunk the space of viable designs and have necessitated automated search procedures for finding designs that satisfy the design requirements. In this paper, such an automated design procedure based on nonlinear optimization techniques is presented. The design procedure includes a general shape representation scheme based on B-spline curves and a set of programs for carrying out automated nonlinear elastic-plastic-contact finite element analysis (for a given shape) using a commercial finite element code. This automated analysis procedure is coupled with a nonlinear optimization code to carryout optimal design of LGA connectors. The design of LGA connectors is mathematically formulated as an optimization problem and nine different design cases (with representative dimensions and material) are solved to determine the influence of initial design and optimization problem formulation. It is shown that better solutions (with less stress) result if both the width and the thickness of the contacts are allowed to vary. In general, the choice of initial design strongly influences the optimal solution. A triply-curved symmetric contact shape is shown to produce the least stress of three possible common LGA shape designs. [S1043-7398(00)00403-5]

Product Modular Design Using Atomic Theory

2009 ◽  
Author(s):  
Chao-Ching Yen ◽  
Shana Smith
Keyword(s):  
Product Design ◽  
Modular Design ◽  
Design Stage ◽  
Original Design ◽  
Atomic Theory ◽  
Design Considerations ◽  
Initial Design ◽  
Material Compatibility ◽  
Innovative Method ◽  
Design Requirements

In this paper, an innovative method is presented which uses the properties of atomic theory to solve design modularization problems for product design. With the developed method, products can be modularized based upon different given constraints, e.g., material compatibility, part recyclability, and part disassemblability. The developed method can help engineers effectively create modular designs in the initial design stage, based upon different design requirements. With design considerations incorporated into new modules, a new design can be created which improves upon an original design, with respect to design requirements.

scholarly journals New challenge to nuclear test facility

Nature ◽  
1997 ◽  
Vol 386 (6624) ◽  
pp. 427-427
Author(s):  
Colin Macilwain
Keyword(s):  
Nuclear Test ◽  
Test Facility
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