Abstract: The air duct leading to a compressor for a gas turbine or the like often has water accumulating on walls and other structures. Water is removed from the compressor air inlet duct by drains connecting to the inside of the duct, including horizontal and vertical walls and the lower wall or floor of the duct. Drains are also provided on hollow structures such as struts, air inlet cone and inlet guide vanes upstream from the compressor. A suction pump or blower lowers pressure in the drain(s) to a pressure less than air pressure in the duct adjacent to the drain outlet for positively sucking water from the drain.

Abstract: A gas turbine or the like with an axial flow inlet compressor has a fogging system for introducing water droplets into the air inlet to the compressor. A compressor may exhibit a “surge” in the event air temperature drops rapidly, which may occur in the event introduction of fogging water droplets is essentially instantly discontinued. One or more pressure accumulators are connected to the water supply of the fog generating system so that in the event there is an interruption in the water supply the accumulator can provide a gradually decreasing water flow to the fog generator. The accumulator gradually decreases water flow for at least about one second. In a fog system having a plurality of fog generating manifolds, separate accumulators may be connected to each manifold.

Abstract: Control of the temperature and humidity of an environment is obtained by injecting a large volume of water droplets into the air with a major portion of the water droplets being in the range of from about 5 to 50 microns in diameter and with an average diameter in the range of from about 10 to 30 microns. When temperatures are low a fog of water droplets essentially opaque to infrared is provided as a cover to crops for preventing frost damage. Crop protection may be poor in borders of fields where cold air drifts in from surrounding areas. Accordingly, fog generators are placed 25 feet or more above the surface to take advantage of temperature inversions. A water curtain may also be used with large drops of warm water falling from a height of about 15 feet to heat and humidify air drifting into the foggy region.