摘要:
A high bypass ratio turbojet engine comprising a fan rotated by the shaft of a low pressure turbine via a speed reducer is provided with a thrust reverser device by providing the speed reducer with first and second epicyclic gear trains which are mounted in parallel between the low pressure turbine and the fan and which are arranged in such a way as to drive the fan in a first direction of rotation when the engine is operated in a direct thrust mode, and to drive the fan in the opposite direction of rotation when the engine is to be operated in the reverse thrust mode.
摘要:
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).
摘要:
A process for manufacturing a hollow turbomachine blade made from a titanium alloy of the TA6V type includes a hot twisting step in which an element of the blade is twisted progressively at a temperature above 700.degree. C. by a plurality of bars which are rotated about the twist axis and act on collars previously fixed to the element, the distribution and number of collars being determined according to the desired twist to be imparted and such as to obtain a linear twist development between each collar. Hot twisting apparatus for use in carrying out the operation is also described.
摘要:
A deburring machine essentially comprising a cutting tool (13) which pivots on an axis (16) that is perpendicular to the axis of rotation (X) and which may be retracted inside the cover (11) by a wedge (10) so that the cover (11) may be inserted through a hole; the cutting tool (13) may then be extended and opened out to deburr the edge of the hole situated on the hidden face of the part. The cutting tool pivots freely in order to adopt the correct angle for the edge to be deburred.
摘要:
A redundant front suspension system for a turboshaft engine mounted on a pylon of an aircraft comprises a primary suspension device forming the normal front suspension of the engine, and an emergency suspension device. The primary suspension device comprises a base member secured to the pylon and having a suspension shaft which co-operates with the intermediate casing of the engine, and thrust take-up rods connect the intermediate casing to the base member. The emergency suspension device comprises an additional member which is interposed between the pylon and the base member of the primary device and which has a second shaft at its forward end extending parallel to the longitudinal axis X of the engine, the second shaft being received with clearance in a bore provided in the intermediate casing and being equipped with means for enabling take-up of forces along the X, Y and Z axes in the event of failure of an element of the primary suspension device.
摘要:
A nickel-based superalloy possessing good mechanical properties when hot regarding traction, creep and cracking resistance has a chemical composition which comprises, in percentages by weight: Co 14.5 to 15.5 ; Cr 12 to 15 ; Mo 2 to 4.5 : Al 2.5 to 4; Ti 4 to 6; Hf not more than 0.5 ; C 100 to 300 ppm; B 100 to 500 ppm; Zr 200 to 700 ppm; possibly W up to 4.5; and nickel as the remainder. Components made from these alloys have an excellent microstructural stability when operating at temperatures up to 800.degree. C.
摘要翻译:具有良好机械性能的镍基超级合金在热牵引,蠕变和抗裂性方面具有化学组成,其重量百分比:Co 14.5至15.5; Cr 12〜15; Mo 2〜4.5:Al 2.5〜4; Ti 4〜6; Hf不大于0.5; C 100〜300ppm; B 100〜500ppm; Zr 200〜700ppm; 可能W高达4.5; 和镍作为其余部分。 当在高达800℃的温度下操作时,由这些合金制成的组分具有优异的微结构稳定性。
摘要:
A device for suspending a turboprop engine from a structural element of an aircraft comprises a suspension pylon parallel to the longitudinal axis of the engine and fixed to the structural element, resilient connections between the engine and the pylon and an arch fixed to the pylon, and a torsion bar carried by the arch so that the bar can pivot freely about its own axis, the opposite ends of the torsion bar being connected to opposite sides of the engine by respective lever and link rod assemblies so that the torsion bar takes up the reaction torque about the longitudinal axis of the engine.
摘要:
Device for cooling the external part of a turbine disk (2) by means of an external fresh air current (circuit II) without mixing with the warmer ventilation from the center of the disk (circuit I). A part (30) through which ducts (31, 32) pass that intersect without interruption, prevents mixing of substantially perpendicular streams in front of a part (22) of the disk (2) and a mixture which reduces the cooling efficiency.
摘要:
Damping disposition for vanes (3) fitted with stilts (4, 5) engaged in the alveoles of the rotor disk (1). Damping elements (10) are added including a portion (11, 12) extending along the flanks (6) of the stilts (4) and including a portion (15) leaning against them. The beating vibrations of the vanes (3) and dampened by these elements able to be used on smooth vanes without any platform, such as large blower vanes. Application for turbo-engines.
摘要:
Device for controlling pivoting blades or variable pitch blades (3) in a turbine in which the control ring (10) rotates under the effect of an angled cam (15) controlled by a system with a connecting rod (22) and crank (21). This system imposes a non-linear rotation law between the blades (3) and the crank (21).