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yago:MechanicalDevice103736970 yago:Object100002684 yago:HeatEngine103507963 yago:Machine103699975 yago:Engine103287733 yago:WikicatPumps yago:Pump104021798 yago:Device103183080 yago:Turbine104498523 yago:WikicatTurbines yago:Internal-combustionEngine103579982 yago:Instrumentality103575240 yago:PhysicalEntity100001930 yago:Artifact100021939 yago:RotaryEngine104110654 yago:Motor103789946 yago:Whole100003553 yago:Mechanism103738472
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Spezifische Drehzahl Specific speed Wyróżnik szybkobieżności 比速度
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比速度とは、ポンプや発電用水車などのターボ機械の形式を表すために用いられる物理量であり、機械を相似形で拡大縮小したとき、単位揚程、単位流量を発生するために必要な回転速度である。 Die spezifische Drehzahl (Formelzeichen oder ) einer Strömungsmaschine (Turbine, Kreiselpumpe, Laufrad) ist diejenige gedachte Drehzahl, bei der eine geometrisch ähnliche Maschine mit einer hydraulischen Fallhöhe oder Förderhöhe von 1 m bei einem Volumenstrom von 1 m³/s ihren besten Wirkungsgrad hat. Specific speed Ns, is used to characterize turbomachinery speed. Common commercial and industrial practices use dimensioned versions which are of equal utility. Specific speed is most commonly used in pump applications to define the suction specific speed [1]—a quasi non-dimensional number that categorizes pump impellers as to their type and proportions. In Imperial units it is defined as the speed in revolutions per minute at which a geometrically similar impeller would operate if it were of such a size as to deliver one gallon per minute against one foot of hydraulic head. In metric units flow may be in l/s or m³/s and head in m, and care must be taken to state the units used. Wyróżnik szybkobieżności – wielkość charakteryzująca maszyny wirnikowe. Rozróżniamy wyróżnik prędkości dynamiczny i kinematyczny. gdzie: – wyróżnik szybkobieżności (wartość bezwymiarowa) – prędkość obrotowa (1/s) – przepływ (m³/s) w punkcie najwyższej sprawności – wysokość podnoszenia (m) w punkcie najwyższej sprawności – przyspieszenie ziemskie (m/s²) Dynamiczny wyróżnik szybkobieżności turbiny – prędkość obrotowa, jaką miałaby turbina podobna do danej, pracując pod spadem H = 1 m i dająca moc N = 1 KM.
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Specific speed Ns, is used to characterize turbomachinery speed. Common commercial and industrial practices use dimensioned versions which are of equal utility. Specific speed is most commonly used in pump applications to define the suction specific speed [1]—a quasi non-dimensional number that categorizes pump impellers as to their type and proportions. In Imperial units it is defined as the speed in revolutions per minute at which a geometrically similar impeller would operate if it were of such a size as to deliver one gallon per minute against one foot of hydraulic head. In metric units flow may be in l/s or m³/s and head in m, and care must be taken to state the units used. Performance is defined as the ratio of the pump or turbine against a reference pump or turbine, which divides the actual performance figure to provide a unitless figure of merit. The resulting figure would more descriptively be called the "ideal-reference-device-specific performance." This resulting unitless ratio may loosely be expressed as a "speed," only because the performance of the reference ideal pump is linearly dependent on its speed, so that the ratio of [device-performance to reference-device-performance] is also the increased speed at which the reference device would need to operate, in order to produce the performance, instead of its reference speed of "1 unit." Specific speed is an index used to predict desired pump or turbine performance. i.e. it predicts the general shape of a pump's impeller. It is this impeller's "shape" that predicts its flow and head characteristics so that the designer can then select a pump or turbine most appropriate for a particular application. Once the desired specific speed is known, basic dimensions of the unit's components can be easily calculated. Several mathematical definitions of specific speed (all of them actually ideal-device-specific) have been created for different devices and applications. Die spezifische Drehzahl (Formelzeichen oder ) einer Strömungsmaschine (Turbine, Kreiselpumpe, Laufrad) ist diejenige gedachte Drehzahl, bei der eine geometrisch ähnliche Maschine mit einer hydraulischen Fallhöhe oder Förderhöhe von 1 m bei einem Volumenstrom von 1 m³/s ihren besten Wirkungsgrad hat. Wyróżnik szybkobieżności – wielkość charakteryzująca maszyny wirnikowe. Rozróżniamy wyróżnik prędkości dynamiczny i kinematyczny. gdzie: – wyróżnik szybkobieżności (wartość bezwymiarowa) – prędkość obrotowa (1/s) – przepływ (m³/s) w punkcie najwyższej sprawności – wysokość podnoszenia (m) w punkcie najwyższej sprawności – przyspieszenie ziemskie (m/s²) Dynamiczny wyróżnik szybkobieżności turbiny – prędkość obrotowa, jaką miałaby turbina podobna do danej, pracując pod spadem H = 1 m i dająca moc N = 1 KM. Kinematyczny wyróżnik szybkobieżności turbiny – prędkość obrotowa, jaką miałaby turbina podobna do danej, pracując pod spadem H = 1 m z przepływem Q = 1 m³/s. 比速度とは、ポンプや発電用水車などのターボ機械の形式を表すために用いられる物理量であり、機械を相似形で拡大縮小したとき、単位揚程、単位流量を発生するために必要な回転速度である。
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