27-11-2012, 06:15 PM
The Mechanical Analysis of a New Multi-channel High-pressure Vessel
The Mechanical Analysis of a New Multi-channel High-pressure Vessel.pdf (Size: 313.93 KB / Downloads: 62)
ABSTRACT
With the rapid development of science and
technology, high-pressure vessel has been widely used in
petroleum, chemical industry, aerospace, and pharmaceutical
areas, and is the key equipment in these areas, and its structure
increasing size, operating pressure and operating temperature
getting higher and higher, and thus the design of pressure vessels
have become increasingly demanding. This type of multi-channel
single-cylinder high-pressure vessel is based on the structure and
then put on several layers of internal and external radius slightly
larger than the previous layer and the overall shape of a cylinder
with a similar structure. This paper describes the basic singlelayer
high-pressure vessel stress-strain formula, on this basis, the
special structure of this container with a great deal of research
and calculation of two-tier structure of most of the derived
formula and the overall general formula. Conducting theoretical
analysis and formulas are pushed to the rear, this paper has
conducted a simulation experiment ANSYS simulation, the
establishment of single-cylinder and multi-layer cylinder model,
and its results were analyzed and compared multi-layer highpressure
container must be obtained clearly superior
performance, further verify the theoretical analysis and the
formula is correct. the multi-channel high-pressure vessel outside
the radius of the entire system should be smaller than the other
containers, but also proof of its special design can save raw
materials, to improve transport and storage efficiency.
THE OVERALL BEARING ANALYSIS OF MULTI-CHANNEL VESSEL
A. The single-cylinder unit elastic-plastic analysis
The overall structure of this paper is sealed packs, in the
cylinder filled with gas, then the surface will be at both ends of
the axial force, that is, analysis of the stress state of a cylinder
axis superimposed on the axial symmetry plane state of stress
(
z σ ). In the elastic state[3] by the z σ impact of radial
strain( r ε ) and circumferential strain ( θ ε ) will add a constant
term, and thus the r andθ the plane had no effect on the
coordination of equations. Then θ σ r σ , still from the r
and θ the plane of the coordination equations obtained
solution, so the solution does not change (no longer on their
analysis of this statement).
INTRODUCTION
As the high-pressure vessel wall thickness [1] gets greater, so
single-layer structure processing and manufacturing are
relatively large difficulty, there is also relatively large the
possibility of defects. However, multi-layer structure [2] of the
steel wire with the winding, composite materials, fiber mesh
winding, double reduction units, the overall multi-clamping
pressure vessel are all close surrounding layers formed. They
exist complex of structure and manufacture, computationally
intensive and trouble, the middle layer relaxation phenomena
with some shortcomings. New high-pressure vessel cylinder
sleeve cylinder model is used to a certain gap between left and
layers of space charge into a constant pressure difference of the
step-like pressure of gas. High-pressure gas from the head of
end entry the aperture. It maintain a constant pressure come
into the stage-like layers by the seal device .so as to make each
layer cylinder produce a certain amount of pre-stressed.
CONCLUSION
Through the mechanical model, derived a new type of
pipe-type high pressure vessel in the whole process of
inflation and deflation produced in step-shaped pre-stressed
formula, the distribution is: the gas pressure between the
layers of cylindrical-shaped pressure on the inside showing the
steps layers of internal pressure the largest and most external
pressure the outermost the smallest, the middle layer in the
most pressure and most of the steps between the external
pressure like a constant pressure difference , through a
combination of multi-layer cylinder to adjust the entire
container system, the stress distribution. ANSYS test analysis
of ordinary single-and double-layer as a whole to withstand
the stress. But they agreed the various parameters, through
comparison of the color lines in the multi-layer cylinder can
be calculated in various single-cylinder under internal and
external pressure to bear on the basis of the superposition of
the error within the allowable range, double cylinder the
overall carrying capacity of an ordinary single-layer 2 times.