Low-temperature composite gas cylinder design method

Abstract

A low-temperature composite gas cylinder design method comprises the following steps: 1, designing laying parameters; 2, calculating the normal-temperature strength and the low-temperature strength ofthe gas cylinder by utilizing a grid theory, judging whether the normal-temperature strength and the low-temperature strength meet requirements or not, if not, returning to the step 1, and if yes, entering a step 3; 3, establishing a finite element model for the gas cylinder, calculating the stress state of the lining of the gas cylinder under normal temperature and low temperature working pressure, the stability of the lining under normal temperature and low temperature zero pressure and the stress in the fiber direction of the outermost layer of the winding layer under low temperature working pressure, and judging whether the Mises stress of the lining under normal temperature and low temperature working pressure does not exceed the yield limit of the material; judging whether the lining structure is complete and stable at normal temperature and low temperature and zero pressure; judging whether the stress in the fiber direction of the outermost layer of the winding layer is not greater than sigma d1 / n under low-temperature working pressure; if yes, the gas cylinder design meets the requirement; otherwise, if the design of the gas cylinder does not meet the requirements, redesign is needed. The design is comprehensive, and it can be guaranteed that the gas cylinder performance meets the requirement.

Description

technical field [0001] The invention relates to a design method of a composite gas cylinder working in a low-temperature environment of 77K to 93K, and belongs to the field of low-temperature pressure vessels. Background technique [0002] The new generation of non-toxic and pollution-free cryogenic launch vehicles in China use cryogenic propellants, and the subsequent new generation of manned rockets and heavy launch vehicles also use cryogenic propellants. The new generation of manned and heavy-duty launch vehicles puts forward higher requirements for carrying capacity, so the structural system should have higher structural efficiency. The gas cylinder is a key component of the pressurization system of the liquid launch vehicle, which is used to store high-pressure gas medium to pressurize or supplement the propellant tank. Placing the gas cylinders in liquid hydrogen and liquid oxygen propellant storage tanks, and using the low-temperature environment of the propellants,...

AI Technical Summary

Problems solved by technology

[0004] The design of low-temperature composite gas cylinders is more complicated than that of room-temperature composite gas cylinders. It is necessary to consider the changes in the mechanical properties of composite materials in all directions at low temperatures, the difference in linear expansion coefficient between composite materials and lining materials, etc. The current design methods are not comprehensive. May cause cylinder performance not to meet requirements

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