BRUSH SEALS FOR GAS-DYNAMIC INSTALLATIONS

Abstract

The creation of a new generation of gas turbine equipment should be provided as one of the most important issues is the provision of high reliability and tightness of sealing gap between stator and rotor. In gas-dynamic installations this is considered to be one of the promising ways to increase their efficiency by reducing losses in the gas path. The presence of a gas leak from areas of high pressure to an area of low pressure is extremely undesirable, reducing the efficiency of the turbine and leading to increase of fuel consumption. To reduce the flow of gas between the body of the gas-dynamic installations and end surfaces of the blades of the turbine radial clearance should be minimal. The experience of recent decades has shown the feasibility of using seals brush type. Almost all promising developments gas turbines for sealing joints are used brush seals. This article presents the results of laboratory research of a new, composite brush seal for gas turbine unit blades. Proposed sealing strips is performed by the method of electrochemical etching directly on the end of the pen blades. This option is the location of the brush seals allowed to extend its functionality and use the brush seals in contact with prerelativity seal. Contact elements brush seal, is pressed their ends to the internal surface of the stator, provide high quality sealing gap. The bristles seals are made integral with the pen blades are strictly regular distribution on the surface of the end face, which remain in operation. Manufacturing technology brush seals on the end of the blades provides for the possibility of using the actual brush seals or brush seals with filler. The last option allows you to combine the positive effects prerelativity and brush seals. The study of tribotechnical characteristics of the seals has shown that the suggested seals have higher operating characteristics compared with the conventional seals. The brush seal was developed and studied at LLC "Turbinepowered" together with the Ufa state aviation technical University.