標(biāo)題: Titlebook: Centrifugal Pumps; Johann Friedrich Gülich Book 20102nd edition Springer-Verlag Berlin Heidelberg 2010 cavitation.fluid flow.hydraulic des [打印本頁(yè)] 作者: hydroxyapatite 時(shí)間: 2025-3-21 16:20
書(shū)目名稱(chēng)Centrifugal Pumps影響因子(影響力)
作者: 富饒 時(shí)間: 2025-3-21 20:54
Pump types and performance data,r in turbomachines is invariably based on hydrodynamic processes for which characteristically all pressure and energy differences are proportional to the square of the circumferential rotor speed. By contrast, positive displacement pumps (e.g. piston pumps) essentially deliver the same volume Vstrok作者: 浮雕 時(shí)間: 2025-3-22 01:43 作者: 無(wú)能性 時(shí)間: 2025-3-22 04:38
Partload operation, impact of 3-D flow phenomena performance, q* < 0.8, at high nq below q* < 0.9. Since blade inlet angles and channel cross sections are too large for the reduced flow rate, flow patterns during partload operation fundamentally change compared with the design point. The flow becomes highly 3-dimensional since it separates in the impeller and作者: 極小量 時(shí)間: 2025-3-22 12:40
Suction capability and cavitation,ally drops to the vapor pressure of the liquid due to excess velocities, so that some fluid evaporates and a two-phase flow is created in a small domain of the flow field. The vapor condenses suddenly (“implodes”) as soon as it is transported downstream into zones where the static pressure again exc作者: 全能 時(shí)間: 2025-3-22 13:22
Design of the hydraulic components,loping these components, the main dimensions and blade angles are calculated in a first step. Subsequently, the hydraulic contours are designed based on certain rules and methods. Many pump manufacturers employ computer programs for this work, and the drawings are generated on 2D-CAD systems. Howeve作者: 全能 時(shí)間: 2025-3-22 17:13 作者: ULCER 時(shí)間: 2025-3-23 00:35 作者: Flounder 時(shí)間: 2025-3-23 04:28 作者: 蚊帳 時(shí)間: 2025-3-23 05:50
Operation of centrifugal pumps, centrifugal pump depends on the pressure difference Δp = ρ×g×HA imposed by the system on the pump. The pressure rise Δp generally depends on the flow rate because of hydraulic losses. Thus the system characteristic HA = f(Q) is understood as the difference in total pressure which must be supplied b作者: Precursor 時(shí)間: 2025-3-23 11:58
Turbine operation, general characteristics,tions are processes where a large amount of fluid energy is dissipated in valves or other throttling devices. In some processes dissolved gases separate from the fluid or liquid is flashed into steam during the expansion. Higher energy differences are then available for power recovery than in pure l作者: 盲信者 時(shí)間: 2025-3-23 17:30 作者: 業(yè)余愛(ài)好者 時(shí)間: 2025-3-23 22:02 作者: 虛情假意 時(shí)間: 2025-3-24 00:41 作者: Callus 時(shí)間: 2025-3-24 04:21 作者: Ossification 時(shí)間: 2025-3-24 06:43 作者: temperate 時(shí)間: 2025-3-24 11:36 作者: 四目在模仿 時(shí)間: 2025-3-24 17:35 作者: refine 時(shí)間: 2025-3-24 22:16 作者: ARM 時(shí)間: 2025-3-25 01:16
T. Frauenstein,U. Pape,O. Wagner= 1. Overload corresponds to q* > 1, while operation at q* < 1 is called “partload”. The pump characteristics describe the behavior of head, power consumption and efficiency as functions of the flow rate (the behavior of NPSH = f(Q) is discussed in Chap. 6). The shape of these performance curves ove作者: 單調(diào)女 時(shí)間: 2025-3-25 06:04
Objektorientierte Programmierung mit C++, q* < 0.8, at high nq below q* < 0.9. Since blade inlet angles and channel cross sections are too large for the reduced flow rate, flow patterns during partload operation fundamentally change compared with the design point. The flow becomes highly 3-dimensional since it separates in the impeller and作者: 帶子 時(shí)間: 2025-3-25 10:25 作者: mucous-membrane 時(shí)間: 2025-3-25 14:23 作者: Encapsulate 時(shí)間: 2025-3-25 18:58 作者: APO 時(shí)間: 2025-3-25 21:40 作者: Biguanides 時(shí)間: 2025-3-26 04:02
Muskelverletzungen des Sportlers,w. The flow at the stator vanes acts back on the velocity field in the impeller. The related phenomena are called “rotor/stator interaction” (RSI). As a consequence of the RSI, hydraulic excitation forces are generated. These give rise to pressure pulsations, mechanical vibrations and alternating st作者: 悄悄移動(dòng) 時(shí)間: 2025-3-26 07:13 作者: BRIDE 時(shí)間: 2025-3-26 11:22 作者: accessory 時(shí)間: 2025-3-26 14:45 作者: cylinder 時(shí)間: 2025-3-26 17:55
T. Frauenstein,U. Pape,O. WagnerThis chapter deals with the calculation methods essentially common to all impellers and diffusing elements regardless of the specific type. The details of calculation and design of the various types of impellers and collectors are discussed in Chap. 7.作者: 容易生皺紋 時(shí)間: 2025-3-27 00:37
https://doi.org/10.1007/978-3-642-96657-6When a centrifugal pump is used for transporting a fluid with a viscosity much higher than cold water, additional losses impair the performance. Therefore, the pump characteristics determined for water must not be applied without correction to pumping highly viscous fluids as encountered for example in the oil and process industry.作者: 開(kāi)始沒(méi)有 時(shí)間: 2025-3-27 01:47
Biomechanics of the Osteoarthritic Hip,Operational problems can often be traced back to a non-optimum - or even downright wrong - pump selection. An unsuitable selection may result from insufficient knowledge of pump operation and installation conditions or from not giving them careful consideration and analysis.作者: 溫和女人 時(shí)間: 2025-3-27 06:24 作者: 變化 時(shí)間: 2025-3-27 11:05
Influence of the medium on performance,When a centrifugal pump is used for transporting a fluid with a viscosity much higher than cold water, additional losses impair the performance. Therefore, the pump characteristics determined for water must not be applied without correction to pumping highly viscous fluids as encountered for example in the oil and process industry.作者: 蓋他為秘密 時(shí)間: 2025-3-27 16:39
Pump selection and quality considerations,Operational problems can often be traced back to a non-optimum - or even downright wrong - pump selection. An unsuitable selection may result from insufficient knowledge of pump operation and installation conditions or from not giving them careful consideration and analysis.作者: lactic 時(shí)間: 2025-3-27 18:27 作者: conscribe 時(shí)間: 2025-3-27 22:05 作者: Colonnade 時(shí)間: 2025-3-28 03:34 作者: 半球 時(shí)間: 2025-3-28 10:04
https://doi.org/10.1007/978-3-642-95869-4e significant for appropriate sizing of shaft and bearings. While the radial force is determined by the pressure distribution . the axial force is governed by the flow through the impeller sidewall gaps and the resulting pressure distributions on the shrouds.作者: 阻撓 時(shí)間: 2025-3-28 12:39
How the Resultant Force R May be Reduced,tions are processes where a large amount of fluid energy is dissipated in valves or other throttling devices. In some processes dissolved gases separate from the fluid or liquid is flashed into steam during the expansion. Higher energy differences are then available for power recovery than in pure liquid flow, Chap. 13.3.作者: Talkative 時(shí)間: 2025-3-28 17:54 作者: obnoxious 時(shí)間: 2025-3-28 18:59
e achievedef- ciency, the stability of the head-capacity characteristic, vibration, noise, com- nent failure due to fatigue, as well as material damage caused by cavitation, - dro-abrasive wear or erosion corro978-3-642-12824-0作者: 我沒(méi)有強(qiáng)迫 時(shí)間: 2025-3-28 23:15
https://doi.org/10.1007/978-3-642-95869-4he casting patterns) by NC milling, stereo lithography or other fast-prototyping processes, [7.1]. The advantages of such processes are evident in terms of geometrical accuracy and lead times (not in the least also for model tests with milled or stereo-lithographed components). Since manual designs 作者: 放肆的我 時(shí)間: 2025-3-29 05:17
Book 20102nd editionspectrum of flow phenomena which have a profound impact on design and operation through the achievedef- ciency, the stability of the head-capacity characteristic, vibration, noise, com- nent failure due to fatigue, as well as material damage caused by cavitation, - dro-abrasive wear or erosion corro作者: 影響 時(shí)間: 2025-3-29 07:41
Operation of centrifugal pumps,y the pump to maintain a specific flow rate through the system, Eq. (T 2.2.6). The operation point of a centrifugal pump is given by the intersection of the characteristics of system asnd pump, Fig. 11.1.作者: 最有利 時(shí)間: 2025-3-29 12:31 作者: 爆炸 時(shí)間: 2025-3-29 16:11 作者: Landlocked 時(shí)間: 2025-3-29 19:43 作者: 橫條 時(shí)間: 2025-3-30 01:03
Book 20102nd editionr pump of a motorcar – are always part of a more or less complex system where pump failure can lead to severe consequences. To select, operate or even design a pump, some understanding of the system is helpful, if not essential. Depending on the appli- tion, a centrifugal pump can be a simple device作者: 裂隙 時(shí)間: 2025-3-30 07:58
underlying physical mechanisms for practical applications.CoLife is linked to liquid transport, and so are vital segments of economy. Pumping devices – be it the human heart, a boiler feeder or the cooling-water pump of a motorcar – are always part of a more or less complex system where pump failure作者: 頂點(diǎn) 時(shí)間: 2025-3-30 08:30
B. Deixonne,M. Makuuchi,J. Mouroux,A. Pissasnomena which are of special interest and significance to the pump engineer. Basic knowledge of the terms of fluid dynamics is taken for granted. There is a wealth of textbooks and handbooks on fluid dynamics, only a few can be quoted: [1.1 to 1.7, 1.14].作者: lethargy 時(shí)間: 2025-3-30 16:13
Ultrasonography of the Biliary Tract,the square of the circumferential rotor speed. By contrast, positive displacement pumps (e.g. piston pumps) essentially deliver the same volume Vstroke at each stroke independently of flow velocity or rotor speed n. The flow rate then becomes Q = nxV.; the pressure rise results solely from the imposed back pressure.作者: 門(mén)閂 時(shí)間: 2025-3-30 20:37
https://doi.org/10.1007/978-3-642-96657-6ion: (1) the corrosive properties of the liquid pumped are not clearly specified (or unknown), or (2) for cost reasons (competitive pressure) the least expensive material is chosen which appears just to be able to do the job.作者: cocoon 時(shí)間: 2025-3-30 21:20
Fluid dynamic principles,nomena which are of special interest and significance to the pump engineer. Basic knowledge of the terms of fluid dynamics is taken for granted. There is a wealth of textbooks and handbooks on fluid dynamics, only a few can be quoted: [1.1 to 1.7, 1.14].
