Study of the Influence Rules between Structural Parameters and Jet Characteristics of a Liquamatic Fire Water Monitor with Self-Swinging Device

2010 ◽  
Vol 37-38 ◽  
pp. 1254-1258 ◽  
Author(s):  
Guo Liang Hu ◽  
Ai Min Hu ◽  
Ju Xing Liang
Keyword(s):  
Structural Parameters ◽  
Internal Flow ◽  
The Self ◽  
Cross Sectional ◽  
Fluent Software ◽  
Working Principle ◽  
Sectional Shape ◽  
In Fire ◽  
Four Bar Linkage ◽  
Jet Characteristics

Fire water monitor is one of the most commonly used equipments in fire fighting. A liquamatic fire water monitor with self-swinging device was designed. The mechanism of an impeller driving four bar linkage was applied as the self-swinging device. The working principle of the liquamatic fire water monitor was introduced. The internal flow performance was simulated using Fluent software; and the influence rules on jet characteristics were analyzed by changing the cross-sectional shape and diameters of the monitor body, inlet pressure and drive set of the self-swinging device. These analyses led to the optimal structural parameters of flow channel. These simulation results will provide useful theoretical guidance for design of other types of fire water monitor.

Study and Simulation for Optimization Plan of the Liquamatic Fire Water Cannon with Self-Swinging Device

2012 ◽  
Vol 468-471 ◽  
pp. 944-948
Author(s):  
Ji Zhou ◽  
Guo Rong Li
Keyword(s):  
Structural Parameters ◽  
Internal Flow ◽  
The Self ◽  
Cross Sectional ◽  
Fluid Field ◽  
Fluent Software ◽  
Sectional Shape ◽  
In Fire ◽  
Four Bar Linkage ◽  
Jet Characteristics

In this paper, fluid field simulation was conducted with the fire water cannon, which is one of the most commonly used equipments in fire fighting. The working principle of the liquamatic fire water cannon was introduced. The internal flow performance was simulated using Fluent software; and the influence rules on jet characteristics were analyzed by changing the cross-sectional shape and diameters of the monitor body, inlet pressure and drive set of the self-swinging device. These analyses led to the optimal structural parameters of flow channel. These simulation results will provide useful theoretical guidance for design of other types of fire water cannon. The liquamatic Fire water cannon with self-swinging device was designed. The mechanism of an impeller driving four bar linkage was applied as the self-swinging device.

Design and Jet Characteristics Study of a Liqumatic Fire Water Monitor with Self-Swinging Device

2010 ◽  
Vol 97-101 ◽  
pp. 2801-2805
Author(s):  
Guo Liang Hu ◽  
Ju Xing Liang
Keyword(s):  
Internal Flow ◽  
Experimental Tests ◽  
Fire Fighting ◽  
Test Rig ◽  
Fluent Software ◽  
Working Principle ◽  
Simulation Results ◽  
Jet Characteristics

Fire water monitor plays an important role in the fire fighting. A liqumatic fire water monitor with self-swing device was designed, the working principle and its components were also expounded in detail. The internal flow performance was simulated using fluent software, the influence rules on outlet velocity were analyzed by changing different angles of the monitor head and diameters of the monitor body. At the same time, the experimental tests were also carried out on the test rig. The simulation results accorded with the theory calculations in general. So, the rationality and accuracy of the designed fire water monitor was verified, and the relevant results can also provide a certain theoretical references for the design of other types of fire water monitor.

Experiment and Optimization of Settling Effect of Drip Streaming Filter

2014 ◽  
Vol 620 ◽  
pp. 246-253
Author(s):  
Su Zhen Wu ◽  
Han Song Yang
Keyword(s):  
Flow Field ◽  
Flow Rate ◽  
Simulation Analysis ◽  
Structural Parameters ◽  
Internal Flow ◽  
Tube Insertion ◽  
Insertion Depth ◽  
Sediment Production ◽  
Fluent Software ◽  
The Relationship

In this thesis, by changing the filter overflow tube insertion depth of spin streaming filter, combined with the existing drip irrigation equipment change the structure parameters of spin streaming filter. Using Fluent software to choose reasonable turbulence model for numerical simulation analysis, contrastive research on the field test was carried on, reveals the relationship between the internal flow field pressure and the flow rate. The sediment production increased before they are reduced with the increase of the overflow tube insertion depth. It should choose the optimal insertion depth according to the specific use and usage model of hydrocyclone in actually use. The variation trend of internal flow field pressure and the flow rate when selected structural parameters changed are also analyzed. With the increase of insertion depth, the axial velocity and radial velocity of sand and water inside the hydrocyclone shows the tendency of decrease. Furthermore, the field experiment verifies the simulation result, thus proving the feasibility of using Fluent computational fluid dynamics software to simulate the internal flow field of the spin streaming filter. The research results will provide referential basis for the design and application of the drip filter system.

Supersonic Flow Past Slender Bodies With Discontinuous Profile Slope

1955 ◽  
Vol 6 (2) ◽  
pp. 114-124 ◽  
Author(s):  
L. E. Fraenkel ◽  
H. Portnoy
Keyword(s):  
Internal Flow ◽  
Leading Edge ◽  
Rate Of Change ◽  
The Body ◽  
Cross Sectional ◽  
Slender Body Theory ◽  
Bodies Of Revolution ◽  
Slender Bodies ◽  
External Forces ◽  
Sectional Shape

SummaryWard’s slender-body theory is extended to derive first approximations to the external forces on slender bodies of general cross section with discontinuous profile slope. Two classes of body are considered: bodies whose profile (typified by the local radius) is continuous between the nose and base, and certain bodies whose profile is discontinuous, such as bodies with annular or side air intakes and wing-bodies on which the wing has an unswept leading edge. (Where air intakes are concerned, it is assumed that they are sharp-edged and that there is no “ spillage ” of the internal flow).The following conclusions apply to the former class of bodies. The variation of drag with Mach number is found to depend only on the discontinuities in the longitudinal rate of change of the cross-sectional area, and is thus independent of cross-sectional shape. The drag itself is unchanged if the direction of the flow is reversed. The expressions for lift and moment assume the same forms as for smooth pointed bodies, the lift depending only on conditions at the base of the body.The general theory is applied to winged bodies of revolution with an unswept wing leading edge: the results bear a marked resemblance to those obtained by Ward. The results for wings alone are seen to be applicable, with one modification, to subsonic as well as to supersonic speeds.

Design and Research of Double Outlet Abrasives Forming Machine

2012 ◽  
Vol 201-202 ◽  
pp. 450-453
Author(s):  
Sui Ying Jin ◽  
Yu Jing Jia ◽  
Guang Zhen Cheng
Keyword(s):  
Screw Conveyor ◽  
Cross Sectional ◽  
Squeeze Out ◽  
Extrusion Mechanism ◽  
Working Principle ◽  
Semi Solid ◽  
Set Up ◽  
Sectional Shape ◽  
Relationship Of ◽  
Machine Work

This article provides an abrasive forming machine, the working principle is that: deliver and squeeze out the semi-solid abrasives which after the mixing treatment through the screw, and set up the same cross-sectional shape and size double outlet mould on the export side, Strip abrasives exported from the extrusion cut into granules by pneumatic cutting device, to realize palletizing requirement. Screw conveyor extrusion mechanism, pneumatic cutting device, combined with appropriate travel switch, Electrical control system, to realize the logical relationship of processing requirements, And compared to double exports abrasive machine, Work efficiency increased 1 time.

Variation of the yarn cross-section in fabric

2012 ◽  
Vol 82 (7) ◽  
pp. 719-724 ◽  
Author(s):  
Raziye Befru Turan ◽  
Ayşe Okur
Keyword(s):  
Cross Section ◽  
Structural Parameters ◽  
Size Variation ◽  
Structural Factors ◽  
Cross Sectional ◽  
The Cross ◽  
Sectional Shape ◽  
Flattening Ratio ◽  
Shape And Size

The aim of this study is to investigate the cross-sectional shape and size variation of the yarn in fabric depending on the structural parameters of fabric. For this reason, the dimensions of the yarns that are in the different regions of the weave unit have been determined by achieving the cross-sectional images of the fabrics, which were woven with different weave types and at different weft settings. The variation in the cross-section of the yarn has been evaluated by using the flattening ratio. Consequently, it has been observed that the structural factors which determine the geometry of the fabric, such as weave type and setting, affect the cross-sectional properties of the yarn along the yarn path.

The influence of structural parameters of fabrics on the bending strength of T-shaped composites

2021 ◽  
pp. 073168442110323
Author(s):  
Ewa Witczak
Keyword(s):  
Bending Strength ◽  
Structural Parameters ◽  
Fold Increase ◽  
Strength Properties ◽  
Test Results ◽  
Cross Sectional ◽  
Industrial Sectors ◽  
One Step ◽  
Sectional Shape ◽  
The Web

Fabric-reinforced composites with an assumed cross-sectional shape due to their specific properties and the possibility of their shaping are increasingly used in many industrial sectors. The article presents the results of research on the influence of T-shaped fabric structural parameters on the bending strength of the composites reinforced with this fabric. The composites were reinforced with a designed 3D fabric, which was made in one step on a classic harness loom. The test results showed that the increase in the bending strength of the T-composite was influenced by the increase of the warp and weft density in the web and the reduction of the weft density in the base. The most important cross-sectional element influencing the bending strength of the T-shaped composite is the web element and the distribution of threads in this composite element. In addition, the T-shaped structure was reinforced by using a multilayer fabric in the appropriate cross-sectional elements. There was a three-fold increase in bending strength compared to composites with the fabric without reinforcement. The strength properties of the composite are influenced by the ‘density’ of the structure expressed by the density of threads. By modifying the construction of the reinforced fabric, the bending strength properties can be shaped.

scholarly journals Optimization and Experimental Study of the Subsea Retractable Connector Rubber Packer based on Mooney-Rivlin Constitutive Model

2021 ◽  
Vol 9 (12) ◽  
pp. 1391
Author(s):  
Kefeng Jiao ◽  
Feihong Yun ◽  
Zheping Yan ◽  
Gang Wang ◽  
Peng Jia ◽  
...  
Keyword(s):  
Structural Parameters ◽  
Optimization Method ◽  
Cross Sectional ◽  
Factors Affecting ◽  
Response Surface Optimization ◽  
Multi Objective Genetic Algorithm ◽  
Design Variables ◽  
Sealing Performance ◽  
The Cross ◽  
Sectional Shape

The sealing performance of the rubber packer is of vital importance for the subsea retractable connector, and the cross-sectional shape of the rubber packer is one of the most important factors affecting it. The compression distance of the rubber packer is increased by 19.54% utilizing the established two-dimensional numerical model. In addition, a new parameter called the anti-shoulder extrusion variable was defined in this paper. Shoulder extrusion will not occur when using this variable as a constraint during simulation. In general, the upper end and the lower end of a rubber packer are subject to different constraints, and the structural parameters of the rubber packer affect each other in terms of sealing performance. Therefore, the importance and originality of this study are exploring the optimization of the thickness and chamfer angles of the upper and lower ends of the rubber packer by use of a combination of the response surface optimization method and the multi-objective genetic algorithm, taking the thickness and chamfer angles of the upper and lower ends as design variables, and the stress on the inner side of the casing wall and the axial force of the compressed rubber packer as optimization objectives. Besides that, the anti-shoulder extrusion variables are also introduced as constraints to prevent shoulder extrusion. Ultimately, the cross-sectional shape of the rubber packer with a smaller-thickness and larger-angle upper end, and a larger-thickness and smaller-angle lower end can be obtained. The result to emerge from the test in this paper is that the pipe pressure that can be sealed by the optimized rubber packer structure is 25.61% higher than that before optimization. The anti-shoulder extrusion variable and the asymmetric cross-sectional shape of the rubber packer proposed in this paper shed new light on the finite element simulation of rubber and the research on similar seals.

On the cross-sectional shape of the cellulose crystallites in the tunicate Halocynthia papillosa

1990 ◽  
Vol 48 (3) ◽  
pp. 566-567
Author(s):  
J.-F. Revol ◽  
Y. Van Daele ◽  
F. Gaill
Keyword(s):  
Contrast Imaging ◽  
Animal Kingdom ◽  
Bright Field ◽  
Field Mode ◽  
Cross Sectional ◽  
Ultrathin Sections ◽  
The Cross ◽  
Sectional Shape ◽  
Valonia Ventricosa ◽  
C Nmr

The only form of cellulose which could unequivocally be ascribed to the animal kingdom is the tunicin that occurs in the tests of the tunicates. Recently, high-resolution solid-state l3C NMR revealed that tunicin belongs to the Iβ form of cellulose as opposed to the Iα form found in Valonia and bacterial celluloses. The high perfection of the tunicin crystallites led us to study its crosssectional shape and to compare it with the shape of those in Valonia ventricosa (V.v.), the goal being to relate the cross-section of cellulose crystallites with the two allomorphs Iα and Iβ.In the present work the source of tunicin was the test of the ascidian Halocvnthia papillosa (H.p.). Diffraction contrast imaging in the bright field mode was applied on ultrathin sections of the V.v. cell wall and H.p. test with cellulose crystallites perpendicular to the plane of the sections. The electron microscope, a Philips 400T, was operated at 120 kV in a low intensity beam condition.

Automated 3D measurement of fiber cross section morphology in handsheets

2012 ◽  
Vol 27 (2) ◽  
pp. 264-269 ◽  
Author(s):  
Christian Lorbach ◽  
Ulrich Hirn ◽  
Johannes Kritzinger ◽  
Wolfgang Bauer
Keyword(s):  
Image Analysis ◽  
Cross Section ◽  
Cross Sections ◽  
Image Plane ◽  
3D Measurement ◽  
Cross Sectional ◽  
Fiber Cross Section ◽  
Fiber Wall ◽  
Sectional Shape ◽  
Cross Section Geometry

Abstract We present a method for 3D measurement of fiber cross sectional morphology from handsheets. An automated procedure is used to acquire 3D datasets of fiber cross sectional images using an automated microtome and light microscopy. The fiber cross section geometry is extracted using digital image analysis. Simple sample preparation and highly automated image acquisition and image analysis are providing an efficient tool to analyze large samples. It is demonstrated that if fibers are tilted towards the image plane the images of fiber cross sections are always larger than the true fiber cross section geometry. In our analysis the tilting angles of the fibers to the image plane are measured. The resulting fiber cross sectional images are distorted to compensate the error due to fiber tilt, restoring the true fiber cross sectional shape. We use an approximated correction, the paper provides error estimates of the approximation. Measurement results for fiber wall thickness, fiber coarseness and fiber collapse are presented for one hardwood and one softwood pulp.

Sign in / Sign up

Export Citation Format

Share Document