Abstract: A compressor system includes a fluid system having a cooler and a valve. The valve includes a housing and a spool disposed within the housing. The spool has a temperature sensitive wax cartridge, and is movable between an actuated position and a non-actuated position. When the spool is in the actuated position, inlet fluid flow enters the valve through an inlet port, exits the valve through the cooler port, flows through the cooler, reenters the valve through the cooler return, flows over the wax cartridge, and exits the valve through the outlet port. When the spool is in the non-actuated position, the inlet fluid flow bypasses the cooler, flows through the valve and over the wax cartridge, and exits the valve through the outlet port. The wax cartridge only senses the temperature of the inlet fluid flow when the spool is in the non-actuated position.

Abstract: A combustor for a gas turbine engine includes a deflector assembly that enhances heat transfer from the combustor and minimizes low cycle fatigue stresses induced within the combustor. The deflector assembly includes a plurality of deflectors secured to a spectacle plate. Each deflector has tapered edges and includes a plurality of cylindrical projections extending outward from the deflector to facilitate heat transfer. The projections include rounded edges and are arranged in a high density pattern. The deflector is coated with a thermal barrier coating and a bondcoat to minimize exposure to hot combustion gases or flame radiation.

Abstract: A pressure exchange apparatus for transferring the energy of pressurization between two fluids, wherein one fluid is at a relatively higher pressure than the other comprising a rotating cylindrical rotor having a bore extending therethrough in fluid communication with an inlet and an outlet.

Abstract: The skin friction drag acting on a surface of an article travelling at high speed such as a vehicle at supersonic or particularly hypersonic speed can be reduced by introducing a fuel into the boundary layer under conditions of the fuel introduction to ensure combustion in the boundary layer. The fuel is injected through orifice(s) or a slot provided at the surface so that the fuel enters the passing fluid with a major component of the direction of injection being parallel to the local flow direction. The fuel is injected at supersonic speed, e.g. at a speed of about Mach 1.5 or higher. The invention is applicable to scramjet engines with the fuel being injected around the entire internal circumference of the wall of the scramjet engine, upstream of the commencement of the combustion chamber.

Abstract: A pond pump having a housing (1) enclosing a synchronous motor (9) with a drive shaft (40) on which an impeller (20) is loosely fitted so that, on start up, the shaft (40) can rotate relative to the impeller (20) until a pair of diametrically opposed keyways (43) on the shaft engage and entrain keyways (27) on the impeller (20) to rotate it continuously in one direction. If the drive shaft initially rotates in the opposite direction, pegs (25) on the rear face of the impeller (20) engage with a detent (60) located behind the impeller (20) to stop said rotation until the motor (9) restarts and rotates the drive shaft (43) in said first direction. One end of the drive shaft (40) is received in a first bearing (50) mounted in the housing (1), the other end of said shaft being received in a blind bore (28) in the impeller (20) which is coaxial with the axis of rotation of the shaft (40).

Abstract: In an apparatus and a method for controlling operation of a reciprocating compressor which is capable of operating a compressor stably by detecting a phase difference and using an inflection point of the phase difference, an apparatus and a method for controlling operation of a reciprocating compressor including an electric circuit unit operating a reciprocating compressor by varying a stroke with motion of a piston, a phase difference detecting unit detecting a phase difference of a current and a voltage from the electric circuit unit, a phase inflection point detecting unit detecting a phase inflection point by being inputted the phase difference, and a stroke controlling unit being inputted the detected phase inflection point from the phase inflection point detecting unit and applying a voltage, to the electric circuit unit in order to make the stroke correspond to the phase inflection point can control a TDC of a piston regardless of load variation, improve an operation efficiency of a reciprocating compr

Abstract: A displacement control mechanism used for compressor is installed in a refrigerant circuit. The compressor has a bleed passage and a supply passage. The displacement control mechanism includes a first control valve and a second control valve. The first control valve includes a first valve body and a pressure sensitive member. The first valve body adjusts the opening size of the supply passage. The pressure sensitive member moves in accordance with a pressure in the refrigerant circuit. A pressure detection region is located downstream of the first valve body. The second control valve includes a second valve body. The second valve body adjusts the opening size of the bleed passage. The second valve body moves in accordance with the pressure of the pressure detection region. When the pressure of the pressure detection region increases, the second control valve decreases the opening size of the bleed passage. This permits to start with rapid cooling performance.

Abstract: A bladeless pump is described which uses a rotating impeller which is substantially smooth. The rotating impeller pumps fluid in a direction perpendicular to its direction of rotation. The moving part of the pump includes a substantially smooth or bumped outer surface, which rotates within a substantially unmoving part. The unmoving part includes grooves which are canted in a specified direction. The innermost surfaces of the grooves form a diameter which is similar to the outermost surfaces of the substantially smooth impeller. When the impeller is spinning, fluid flow between the grooves is prevented. This causes fluid flow generally in the direction of the grooves.

Abstract: A control circuit for controlling the rotational speed of a heat-dissipation fan for an electronic device, the circuit including a temperature sensing circuit for sensing the ambient temperature of the device and providing a temperature signal, a comparator circuit for receiving the temperature signal and for comparing it with a predetermined threshold, and a drive circuit for receiving the comparison signal and for controlling the rotational speed of the fan so that, when the ambient temperature is above the threshold, the speed changes substantially linearly with respect to the difference between the ambient temperature and the threshold and, when the ambient temperature is below the threshold, the fan is stopped.

Abstract: A method for operating a supersonic hybrid jet power plant during various flight operations. The power plant includes a jet engine and a reciprocating internal combustion engine, the jet engine having a housing defining an inlet for receiving air, an afterburner section, and a nozzle for expelling air and combustion byproducts. The reciprocating internal combustion engine is disposed in the housing, has an intake manifold located at the inlet, and is operatively coupled to a fan rotationally mounted adjacent to the afterburner section of the jet engine. The fan is preferably operated during subsonic flight operations to boost air pressure to the afterburner. In this manner, suitable air flow at the inlet is maintained with the assistance of the reciprocating internal combustion engine during subsonic flight operations, but assistance is reduced or eliminated during supersonic flight operations so that a pressure build-up ratio of close to one is maintained.

Abstract: A microthruster (11) provides a small unit force. The microthruster is useful, for example, as a propellant for a microsatellite. The microthruster includes an aerospike (12) extending outwardly beyond the face of an outer wall of the chamber (14) of the microthruster in the vicinity of an outlet nozzle thereof formed by two diaphragms or burst disks (15, 16), closing the chamber on respective sides of the aerospike. The aerospike is preferably formed integrally with the chamber by batch microelectronic fabrication methods. Higher thrust efficiency and more controllable and uniform impulse characteristics are attainable with the microthruster and with an array (17) comprising a plurality of the microthrusters.

Abstract: A displacement machine for compressible media includes at least two shafts. Each of the shafts has a rotor which is configured as a profiled body with the profiles of the rotors engaging one another in the manner of gearwheels during rotation and running without contact relative to one another. Each of the shafts is driven by an electric motor. The angular positions of each shaft is determined by an associated synchro resolver. Each of the synchro resolvers has a rotor and emits an electronic signal to the electric motor of the shaft such that the motors are electronically synchronized. Each of the shafts further has a gearwheel, with the gearwheels engaging one another and having an angular clearance which is smaller than that of the profiled bodies. At least one of the gearwheels is directly connected to the rotor of the synchro resolver associated with its shaft and both gearwheels together are releasably connected as a unit to the shaft.

Abstract: A diaphragm pump, in which a working fluid control valve (D) opens a working fluid make-up passage (B24) to prevent a diaphragm (C) from being damaged when an excessive discharge pressure acts on the diaphragm. The working fluid control valve (D) for opening and closing the working fluid make-up passage (B24) is provided with a valve disc formed to be capable of reciprocating relative to the diaphragm (C) in a valve disc receiving chamber (B2) to close an opening of the valve disc receiving chamber (B2), means for biasing the valve disc toward the diaphragm, and means for closing the working fluid make-up passage (B24) when a distance, over which the valve disc extends from the opening of the valve disc receiving chamber, exceeds a predetermined value.

Abstract: variable displacement compressor has a drive shaft extending through a crank chamber. A lug plate is integrally fixed to the drive shaft. A drive plate is connected to and driven by the lug plate by a hinge mechanism. The drive plate inclines with respect to the drive shaft to vary the displacement of the compressor. The hinge mechanism has a linear guide on the lug plate and a pin projecting from the drive plate toward the lug plate. A bearing surface engages the pin. The pin has an axis that intersects an axis of the guide. The axis of the pin is parallel to the axis of the drive shaft when the compressor operates with a maximum load.

Abstract: A free piston pump has a pump housing defining a chamber, and a free piston located within the chamber. The free piston defines one (or more) pumping chamber(s). Each pumping chamber receives fluid from one (or more) inlet port(s) and delivers fluid to one (or more) outlet port(s). The pump has an electromagnetic drive system for moving the free piston within the chamber. Check valves or porting can be used to admit fluid into the pumping chamber(s) and release fluid from the pumping chamber(s). The pump can use three types of bearings and two types of seals. The pump has small heat leakage to the fluid being pumped. The pump is insensitive to cavitation, and has the potential for long-life. The pump has low leakage to the ambient environment.

Abstract: An air chamber device has an air pump having a first air discharge valve, an air chamber connected to the air pump for receiving air discharged by the first air discharge valve, and a second air discharge valve for discharging air from the air chamber. The air pump has an elastic body having an upper elastic part and a lower elastic part connected together to define an interior space. At least one through-hole is formed in the upper elastic part for introducing ambient air into the interior space.

Abstract: Service life is improved in a swirler assembly including a primary swirler and a secondary swirler having a venturi formed thereon and being disposed in engagement with the primary swirler. First and second rails are formed on the secondary swirler and are positioned to engage the primary swirler and thereby prevent relative rotation of the primary and secondary swirlers.

Abstract: An electromagnetic pump including a housing having an interior fluid containing region, a check valve operatively flow in a direction from an inlet toward an outlet and blocking fluid flow in a direction from the outlet to the inlet, an electromagnet carried by the housing located external to the fluid containing region, and a barrier of fluid impervious material for isolating the electromagnet from the fluid. An armature movable in the housing through pumping and return strokes has a pole portion located for magnetic attraction by the electromagnet and has a plunger portion extending from the pole portion. The armature plunger and pole portions have formations crimped together to secure the plunger and pole portions together. The barrier or an end surface of the armature pole portion are shaped to enhance separation of the barrier and armature pole portion at the beginning of the return stroke. The housing is provided with shims for adjustment of the delivered stroke volume.

Abstract: A steam-cooled second-stage nozzle segment has an outer band and an outer cover defining a plenum therebetween for receiving cooling steam for flow through the nozzles to the inner band and cover therefor and return flow through the nozzles. To measure the temperature of the buckets of the stage forwardly of the nozzle stage, a pyrometer boss is electron beam-welded in an opening through the outer band and TIG-welded to the outer cover plate. By machining a hole through the boss and seating a linearly extending tube in the boss, a line of sight between a pyrometer mounted on the turbine frame and the buckets is provided whereby the temperature of the buckets can be ascertained. The welding of the boss to the outer band and outer cover enables steam flow through the plenum without leakage, while providing a line of sight through the outer cover and outer band to measure bucket temperature.

Abstract: A flow path for the pressure gas which is to be connected to a pressure gas feeder is formed almost rectilinearly, a liquid reservoir chamber to be connected to a pressure liquid feeder is provided in the flow path for the pressure gas. The sectional area of the flow path for the pressure fluid is gradually reduced to form an accelerating portion, an injection port for a liquid injection nozzle communicating with the liquid reservoir chamber is provided in the acceleration portion and a gas injection port is formed on the outside to enclose the injection port of the liquid injection nozzle. A powder and granular material may be mixed into the pressure gas or the pressure liquid, or a detergent may be added into the pressure liquid.