摘要:
The moving blades are configured so as to meet a condition: (L+3D)×f≧14,500 or L×(L+D)×f2≧1.55×107, where L is an effective length of the moving blade measured in inches, D is a blade root circle diameter of the moving blades measured in inches, and f is the rated operating speed of the turbine measured in Hz. The moving blades are formed of a titanium alloy. The dovetail has an Christmas-tree shape, and is a curved-axial-entry. The moving blades are configured and arranged so as to meet a condition: 3.5≦P/W≦7.0 or 0.8≦P/C≦1.0, where W is a width of a section of a tip of the moving blade measured along an axis of the rotor wheel, P is pitch of the moving blades, and C is a chord length of the tip section of the moving blade. Adjacent moving blades are connected to each other in such a manner that the adjacent moving blades being capable of relative movement while the adjacent moving blades being connected to each other.
摘要翻译:移动叶片被构造成满足以下条件:(L + 3D)×f> = 14,500或Lx(L + D)×f <2 >> = 1.55×10 7,其中L是动叶片的有效长度 以英寸为单位,D是以英寸测量的动叶片的叶片根圆直径,f为以Hz为单位的涡轮机的额定运行速度。 活动叶片由钛合金形成。 燕尾形有一个圣诞树形状,是一个弯曲的轴向入口。 移动叶片被构造和布置成满足以下条件:3.5 <= P / W <= 7.0或0.8 <= P / C <= 1.0,其中W是测量到的动叶片的尖端的截面的宽度 沿着转子轮的轴线,P是活动叶片的间距,C是动叶片的尖端部分的弦长。 相邻的活动叶片彼此连接,使得相邻的活动叶片能够相对移动,同时相邻的活动叶片彼此连接。
摘要:
A low alloy steel ingot contains from 0.15 to 0.30% of C, from 0.03 to 0.2% of Si, from 0.5 to 2.0% of Mn, from 0.1 to 1.3% of Ni, from 1.5 to 3.5% of Cr, from 0.1 to 1.0% of Mo, and more than 0.15 to 0.35% of V, and optionally Ni, with a balance being Fe and unavoidable impurities. Performing quality heat treatment including a quenching step and a tempering step to the low alloy steel ingot to obtain a material, which has a grain size number of from 3 to 7 and is free from pro-eutectoid ferrite in a metallographic structure thereof, and which has a tensile strength of from 760 to 860 MPa and a fracture appearance transition temperature of not higher than 40° C.
摘要:
A turbine rotor blade according to the present invention includes a cover provided at the top of an effective blade portion and a blade-fitting portion provided at the bottom of the effective blade portion. A turbine wheel is provided with a turbine-wheel engagement portion to which the blade-fitting portion is fittable. The turbine rotor blade is a portion of a blade array structure formed by arranging the cover and a neighboring cover in contact with each other. The blade-fitting portion is provided with an anti-twist segment, and the turbine-wheel engagement portion is provided with an untwist restraining segment engageable to the anti-twist segment.
摘要:
A turbine rotor blade according to the present invention includes a cover provided at the top of an effective blade portion and a blade-fitting portion provided at the bottom of the effective blade portion. A turbine wheel is provided with a turbine-wheel engagement portion to which the blade-fitting portion is fittable. The turbine rotor blade is a portion of a blade array structure formed by arranging the cover and a neighboring cover in contact with each other. The blade-fitting portion is provided with an anti-twist segment, and the turbine-wheel engagement portion is provided with an untwist restraining segment engageable to the anti-twist segment.
摘要:
A memory bandwidth control device for improving efficiency of data transfer between an external device and a memory. A memory is used for temporarily storing and outputting data to be communicated with external devices being connected via input/output ports, and an I/O buffer dynamically assigns memory bandwidth to external devices requesting data transfer when receiving the data transfer requests from the external devices to the memory. When compared to assigning fixed memory bandwidth, efficiency of data transfer to the memory can be significantly improved without wasting memory bandwidth.
摘要:
An Ni-base alloy for a turbine rotor of a steam turbine contains in percent by weight C: 0.01 to 0.15, Cr: 15 to 28, Co: 10 to 15, Mo: 8 to 12, Al: 1.5 to 2, Ti: 0.1 to 0.6, B: 0.001 to 0.006, Re: 0.5 to 3, and the balance of Ni and unavoidable impurities.
摘要:
A blade for an axial fluid machine comprises an effective blade portion having a root portion and a tip portion and projecting blade portions. The projecting blade portions are defined by axis reference lines extending to an upstream side with respect to a fluid flow from at least one of the root portion and the tip portion of the effective blade portion and by axes obliquely extending from ends of the axis reference lines toward a leading edge of the effective blade portion. The projecting blade portions are formed continuously to and integrally with the leading edge of the effective blade portion so that the effective blade portion and the projecting blade portions have substantially the same maximum blade thickness.
摘要:
A heat resistant cast steel of an embodiment contains in percent by mass C: 0.05-0.15, Si: 0.03-0.2, Mn: 0.1-1.5, Ni: 0.1-1, Cr: 8-10.5, Mo: 0.2-1.5, V: 0.1-0.3, Co: 0.1-5, W: 0.1-5, N: 0.005-0.03, Nb: 0.01-0.2, B: 0.002-0.015, Ti: 0.01-0.1, and a remainder comprising Fe and unavoidable impurities.
摘要:
A forging heat resistant steel of an embodiment contains in percent by mass C: 0.05-0.2, Si: 0.01-0.1, Mn: 0.01-0.15, Ni: 0.05-1, Cr: 8 or more and less than 10, Mo: 0.05-1, V: 0.05-0.3, Co: 1-5, W: 1-2.2, N: 0.01 or more and less than 0.015, Nb: 0.01-0.15, B: 0.003-0.03, and a remainder comprising Fe and unavoidable impurities.
摘要:
A Nickel-based alloy for a turbine rotor of a steam turbine contains C: 0.01 to 0.15, Cr: 18 to 28, Co: 10 to 15, Mo: 8 to 12, Al: 1.5 to 2, Ti: 0.1 to 0.6, B: 0.001 to 0.006, Ta: 0.1 to 0.7 in % by weight, and the remaining portion is composed of Ni and unavoidable impurities. The Nickel-based alloy is composed of the above-stated chemical composition range, and thereby, a mechanical strength improves while maintaining forgeability as same as a conventional steel.