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Wang J.-N.,Xi'an Modern Chemistry Research Institute | Jin X.,Beijing Mechanical Equipment Research Institute | Zheng W.,Xi'an Modern Chemistry Research Institute | Song X.-D.,Xi'an Modern Chemistry Research Institute
Huozhayao Xuebao/Chinese Journal of Explosives and Propellants | Year: 2014

Specific impulse and burning temperature of composite modified double-base (CMDB) propellant containing CL-20, RDX and Al were calculated by means of minimum free energy method and REAL system. The change of specific impulse along with pressure was analyzed. It was showed that a significant increase in specific impulse occurred at low pressure while a little at high pressure with the increase of pressure. The increase of specific impulse was higher than 6% with the pressure increasing from 2MPa to 4MPa, but it was lower than 1% with the pressure increasing from 18MPa to 20MPa for the CMDB propellants containing CL-20, CL-20/RDX and CL-20/Al. The increase of specific impulse along with pressure was higher than that of RDX when the propellant contained CL-20 or Al at low pressure range, which showed that CL-20 or Al was in favor of energy release at low pressure.

Yu K.-H.,Henan University of Science and Technology | Wang J.-S.,Beijing Mechanical Equipment Research Institute | Yang X.,Northwest University, China | Yue Z.-F.,Northwest University, China
Reneng Dongli Gongcheng/Journal of Engineering for Thermal Energy and Power | Year: 2011

Established was a model for analyzing the fluid/heat coupling in the cooling blades of a return flow type turbine. The P-1 radiation model was used to add the radiant heat flow to the equation as the source item. An analysis was performed of the fluid/heat coupling of the cooling blades having no heat barrier coating with radiations being taken into account and not respectively. It has been found that the cooling air, which accounts for 3.76% of the total gas mass flow rate, can cause a temperature drop of 200 K to the blades by using the return flow type cooling structures. When the highest inlet temperature is 1655 and 1555 K respectively, a comparison of the temperature distributions on the blades obtained by using the two calculation models shows that the influence of radiations on the temperature of the blade surfaces is remarkable and this makes it relatively easy to form a highest temperature point at the tip of the trailing edge of return flow type cooling blades.

Tian X.X.,Beijing Mechanical Equipment Research Institute | Tian X.X.,University of Paris 13 | Yang X.D.,Beijing Mechanical Equipment Research Institute | Li J.,University of Paris 13 | And 2 more authors.
Materials Research Innovations | Year: 2015

In this paper, a two-dimensional damage model and its numerical solution are presented by means of fast Fourier transforms for anisotropic composite. First, the constitutive relation with damage variable is given from strain energy density based on the two-dimensional constitutive relation of anisotropic composites. Second, the crack growth principle is given according to maximum K criterion. Finally, a numerical solution can be obtained using the fast Fourier transforms method. Numerical examples of carbon-fibre unidirectional reinforced resin matrix composite are introduced. © W. S. Maney & Son Ltd 2015.

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