Abstract: A turbomachine assembly comprising: an annular compression section; a casing formed by an outer annular shell (204) and an inner annular shell (206) secured inside the outer shell by means of a plurality of radial support arms (208); an annular combustion section housed inside the casing; and an annular turbine section.

Abstract: A method of optimizing a chemical reaction in a plate-type open reactor, the method consisting in: establishing a dynamic model of the reactor for a given reaction on the basis of a model of the reactor and its heat exchanges; applying an integration software tool to the dynamic model in order to solve the above-mentioned equations; determining and optimizing a set of dimension and/or operation parameters of the reactor on the basis of evaluating targets to be achieved, constraints to be complied with, and variable data for the reactor and/or the reaction; building a plate reactor of the said type accordingly to the set of optimized parameters; and doing measurements of physical parameters during the execution of said reaction in the built reactor, for validating its operation.

Abstract: A part for a motor vehicle intended to come into contact with hydrocarbons has a polytetrafluoroethylene coating (3) adapted to make the part (1) impermeable. Use of a polytetrafluoroethylene coating for making impermeable parts of a motor vehicle on the fuel system, in order to limit the emission of hydrocarbons through these parts.

Abstract: A rocket engine having a combustion chamber with a chamber inner wall, a throat with a throat inner wall, and a nozzle with a nozzle inner wall is provided. The chamber inner wall is a vacuum plasma sprayed metal, the throat inner wall is a vacuum plasma sprayed metal, and the nozzle inner wall is a vacuum plasma sprayed metal. The porosity of the vacuum plasma sprayed metal varies in an axial direction of the engine.

Abstract: A part for a motor vehicle intended to come into contact with hydrocarbons has a polytetrafluoroethylene coating (3) adapted to make the part (1) impermeable.

Abstract: The axial thrust exerted on a rotating shaft, such as the shaft of a turbomachine rotor, is measured by a device comprising a resilient washer sandwiched between two flange members disposed around the shaft so that the axial thrust will cause axial compression of the washer between the two flange members, and displacement-measurement probes secured to a fixed structure for measuring the displacements of the flange members so that the axial thrust can be determined from the difference between the displacements and corresponding to the change in thickness of the resilient washer.

Abstract: A turbine vane-system cooling system uses three internal cooling cavities 1, 12, 13) separated by two radial walls (9, 10). The upstream cavity (11) uses a helical ramp (30) and is fed through an intake (22) at the vane root (3). The middle cavity (12) also is fed at the vane root (3) and includes a compartmented, multi-perforated lining (40). The air is exhausted from each compartment through impact orifices and enters the succeeding compartment through slots (42) and then is finally exhausted through a vane-head orifice (21). The vane side walls opposite the downstream cavity (13) have double skins with bridging elements. The air passes through these double skins but circulates centrifugally in the upstream portion (15) of the downstream cavity (13) and enters this cavity's downstream portion (16) to be exhausted through slots (19) in the trailing edge (6). A third wall (14) divides the downstream cavity (13) into two parts (15, 16).

Abstract: For the purpose of taking measurements within a V-engine while it is running during development of the engine, a first of the two banks of piston and cylinders defining the V is provided with measurement sensors and is arranged to run normally performing the normal cycle of induction, compression, combustion, and exhaust, and each cylinder of the second bank has its fuel inlet closed and its combustion chamber open to the atmosphere whereby the second bank functions without compression and combustion and is effectively inert, the second bank serving as a mechanical support for conveying signals from the measurement sensors.

Abstract: A hydraulic brake system for vehicles, particularly light rail vehicles, includes at least one brake actuator for engaging the brake by means of a group of springs and disengaging the brake by hydraulic pressure. The system comprises an electric drive motor and pump for supplying pressurized hydraulic fluid to the actuator, and a safety valve and solenoid valves for controlling the pressure of the hydraulic fluid in the actuator. An accumulator is connected to the electric drive motor and pump for delivering the pressurized hydraulic fluid via valves and restriction for adjusting the pressure in the accumulator to a value substantially inversely proportional to the load of the vehicle. It is connected to the actuator by shuttle valves controlled by the pressure of the accumulator when the control safety valve and solenoid valves are actuated to relieve hydraulic fluid from the actuator.

Abstract: A spring brake actuator has a quick release clutch for deactivating the brake in absence of fluid pressure and a governing device operating the clutch in response to the relative pressures prevailing at the service brake and spring brake cylinders. The governing device comprises a biased pilot valve and a signal valve which permit alternate operation of the brake release clutch manually or automatically.

Abstract: A spring brake actuator has manual means for discontinuing and automatic means for restoring the spring braking function. A non-self-locking nut member is rotatable about the spindle and is releasably locked to the brake cylinder in that direction it rotates due to spring force.

Abstract: An actuator for a spring brake used for parking and emergency has a spring operating on the brake push rod which will apply braking unless fluid pressure in the braking system applied to a piston overcomes spring pressure. To disable the spring brake the rod is retracted by a mechanism coupling the piston to the rod so that the brake is automatically restored into service when the piston is operated by the fluid pressure. The mechanism has a one-way clutch engaging a threaded push rod by means of a nut in non-self-locking engagement on the push rod threads.

Abstract: A mandrel mounted on a support and corresponding to the configuration of the tube to be formed is surrounded by an inductor placed at a distance which permits displacement and expansion of the tube on the mandrel under the action of pressure application means. The inductor carries a medium-frequency current which is maintained at a constant value during the forming operation in order to permit controlled annealing and plastic deformation of the tube.