A hydrophilic surface pattern on a removal surface of a steam turbine directs surface moisture in at least one predetermined direction to enhance moisture management by enhancing moisture removal or otherwise reducing erosion caused by moisture in the steam turbine. In some embodiments, the removal surface is located on the outer surface of the nozzle wall adjacent an extraction opening. In some embodiments, the removal surface is located on the surface of the bucket and directs moisture toward the turbine rotor. In some embodiments, the removal surface is located on the surface of the turbine casing or the surface of the nozzle and directs moisture toward a drain in the turbine casing. The hydrophilic surface pattern is preferably laser-etched as a nano-scale pattern to create the hydrophilic surface. In some embodiments, the hydrophilic surface pattern creates a superhydrophilic surface.

A heat transfer system is disclosed that includes a circulation loop of a heat transfer fluid that comprises a halocarbon. The circulation loop includes a compressor or pump that includes bearing rolling surfaces in contact with the heat transfer fluid. The bearing contact surface has a substrate a layer thereon that includes a polymer or oligomer having polar side groups and a tribofilm.

An air inlet section for an aircraft propulsion system nacelle includes an outer skin, an inner skin, and a lip skin. The lip skin extends between and to an outer end and an inner end. The outer end is disposed at the outer skin. The inner end is disposed at the inner skin. The lip skin forms an exterior lip skin surface extending from the inner end to the outer end. The exterior lip skin surface forms a leading edge of the lip skin. The exterior lip skin surface includes an outer surface portion and an inner surface portion. The outer surface portion extends from the outer end to the inner surface portion. The outer surface portion forms a hydrophobic surface. The inner surface portion extends from the inner end to the outer surface portion. The inner surface portion forms a hydrophilic surface.

A gas turbine having a wet compression device which allows droplets of an aqueous liquid mixture to be introduced into a compressor of the gas turbine during operation of the gas turbine, the aqueous liquid mixture containing at least one surfactant. The aqueous liquid mixture additionally contains at least a defoaming agent, and the gas turbine has a second metering device, which is designed to feed a predetermined quantity of defoaming agent into water which is provided for use in the wet compression device.

An erosion resistant material has a continuous portion and discontinuous portions. The continuous portion has a continuous structure. The discontinuous portions are arranged inside the continuous portion to have a discontinuous structure. The discontinuous portions are formed of particles having an average particle diameter of 1 m or less. Further, the discontinuous portions are formed of a material having a surface hardness and a Young's modulus higher than those of the continuous portion.

A heat transfer system is disclosed that includes a circulation loop of a heat transfer fluid that comprises a halocarbon. The circulation loop includes a compressor or pump that includes bearing rolling surfaces in contact with the heat transfer fluid. The bearing contact surface has a substrate a layer thereon that includes a polymer or oligomer having polar side groups and a tribofilm.

A gas turbine system may include an exhaust gas processing system configured to process exhaust gas received from a gas turbine engine of the system. An exhaust path of the exhaust processing system is configured to flow the exhaust gas through the exhaust processing system. A tempering air system of the exhaust processing system is configured to introduce tempering air into the exhaust path to cool the exhaust gas. The tempering air system includes a tempering air pathway extending from an air inlet of the tempering air system to a tempering air outlet where tempering air is introduced from the tempering air system and into the exhaust path. A filter system of the tempering air system has a hydrophobic filter positioned along the tempering air pathway, the hydrophobic filter being configured to remove hygroscopic and deliquescent materials from the air flowing through the tempering air pathway.

Aspects of the disclosure include methods and systems for the de-icing of pulse filters, such as those used in turbomachinery. A method according to the present disclosure can include: coupling a filter bag to the pulse filter such that the filter bag is in a contracted position, the filter bag having a complementary geometry relative to the pulse filter, such that the filter bag occupies an airflow cross-section of the pulse filter, and wherein the filter bag is composed of one of a hydrophilic material, a hydrophobic material, or an oleophobic material; and pulsing a compressed air through the pulse filter and the filter bag during operation of the gas turbine, such that the filter bag expands to dislodge ice from an outer surface of the filter bag.

A steam turbine has a plurality of stages constituted of pairs of a rotor blade and a stator vane arranged in an axial direction. A casing has a casing opening portion which allows water droplets circulating in a main flow channel to flow in therethrough. The rotor blade has a plurality of rotor blade hydrophilic portion which guide the water droplets that have adhered to a rotor blade surface toward the casing opening portion. The stator vane has a drain suction port which opens on a stator vane surface extending in a radial direction and allows the water droplets that have adhered to the stator vane surface to flow in therethrough, and a plurality of stator vane hydrophilic portions which are formed with a gap therebetween in the radial direction with respect to the stator vane surface and guide the water droplets that have adhered to the stator vane surface toward the drain suction port.

A gas turbine system may include an exhaust gas processing system configured to process exhaust gas received from a gas turbine engine of the system. An exhaust path of the exhaust processing system is configured to flow the exhaust gas through the exhaust processing system. A tempering air system of the exhaust processing system is configured to introduce tempering air into the exhaust path to cool the exhaust gas. The tempering air system includes a tempering air pathway extending from an air inlet of the tempering air system to a tempering air outlet where tempering air is introduced from the tempering air system and into the exhaust path. A filter system of the tempering air system has a hydrophobic filter positioned along the tempering air pathway, the hydrophobic filter being configured to remove hygroscopic and deliquescent materials from the air flowing through the tempering air pathway.