Filtering Walls Мade of Sintered Metal Gauzes for Built-in Filters of Aviation Hydraulic Systems

Results of theoretical and experimental researches related to cold deformation degree influence when rolling on strength and hydraulic characteristics of metal gauzes used for production of built-in filters’ filtering walls have been presented. An analytical dependence of gauze’s permeation coefficient on the gauze’s reduction ratio and relative lengthening when rolling has been received based on ideal porous body’s capillary model. Theoretical research results have been compared with the experimental data obtained at filtration of compressed air and mineral oil through samples of gauzes with various degree of cold deformation. Experimental dependences of gauzes’ relative lengthening and strength limit on their cold deformation degree have been presented. Results of visual researches of deformed gauzes’ surface condition have been presented. A dependence of contact spots’ square at gauzes’ surfaces on reduction ratio has been received. The analysis of contact spots’ influence on hydraulic characteristics of the multilayered mesh material used for filtering walls production has been carried out. Results of experimental studies of gauzes’ hydraulic characteristics have been processed in the form of dimensionless dependence of hydraulic resistance coefficient on filtered environment stream’s Reynolds number.