Studying coupled processes of hydroelasticity and durability of a centrifugal injector for preparing high viscosity fuels

S. D. Zambalov ; V. A. Skripnyak

Vestnik Tomskogo gosudarstvennogo universiteta. Matematika i mehanika, no. 2 (2015), pp. 71-85

Résumé

The paper presents a solution of the coupled problem of deformation and durability of the reaction chamber of a centrifugal injector utilizing a highly dispersed mixture of fuel oil and gaseous oxidizer. A technique for solving problems of deformable solid mechanics and computational fluid dynamics is proposed. A physical-mathematical model determining the implementing strain-stress state of the device, fluid flow under the dynamic problem of hydroelasticity, and parameters of the fatigue life in a pulsating loading history is developed. On the basis of numerical results, the hydrodynamic effect of the fluid flow on deformation of design elements is estimated. Fluid dynamic parameters such as contours of pressure and velocity are evaluated. Zone of minimal safety factor of the device are obtained. Numerical results obtained for the coupled problem by use of a unified computational model are compared with the solution of a similar problem in a simplified formulation using the elasticity theory where the load is specified as pressure uniformly distributed on inner surfaces of elements. The difference between the results is 10% in equivalent stresses, 19% in total deformation, and 35% in the safety factor. Using the system approach to modeling coupled processes in injectors reduces designing costs due to a more precise forecast of the strain-stress state and durability of the developed devices. The proposed rechnique for solving coupled problems can be used in developing new devices working under conditions of vibration and cyclic loads in energy, oil-refining industry, and related branches of machinery.

Détail

Keywords: coupled problem, durability, safety factor, centrifugal injector, black fuel oil.
Mots-clés : fatigue life, dispersion