■L.D.V.による吐出性能比較結果■Comparison of discharge ■HR320インペラのフローパターン■Flow pattern of the HR320 ■翼近傍の流動状態■Flow condition near the bladepit edaBilpitV/qVretnec laxA翼端4枚ピッチドパドル(i=45°) 4-bladed pitched paddle軸中心The advance blade angle causes the liquid flow near the blade surface to move toward the inside, due to the pressure distribution behind the blades. The bend structure features a reduced attack angle at the leading edge, to create a downward twisting force. These effects combine to prevent flow separation at the blade tips and improve discharge performance.The HR320 Impeller meets agitation needs for large discharge rates, such as for uniform distribution of concentration and temperature in the high Reynolds number range, with minimum liquid surface fluctuation.The HR320S Impeller generates an advance blade effect and controls the blade surface pressure. Combined with a large attack angle, these features prevent flow separation on the blade surfaces. To achieve high discharge velocity, the impeller incorporates a double-blade structure, which provides the similar effects created by the slotted flaps of an airplane. The HR320S is also equipped with Satake’s original blade tip boards. They eliminate the need for stabilizer rings and allow the impeller to continue operation that liquid level passes over impeller position.The HR320S Impeller is suited for operation that liquid level passes over impeller position, for applications in which the blade installation height is limited, and for agitation of solid and liquid mixtures.P.T.V. flow analysis resultC.F.D. numerical simulation resultL/(d/2)13インペラ(中・高Re数域) HR320 Impeller (Medium and high Re number range)インペラ(中・高Re数域) HR320S Impeller (Medium and high Re number range)条件槽径:D翼径:d回転数:N縦軸:吐出流速(Vq) 翼先端周速度(Vtip) 横軸:翼下部半径D=490mmd/D=0.3N=300min-10.550.500.450.400.350.300.250.200.150.100.050.000.00.20.40.60.81.01.2Test conditionsTank diameter: DImpeller diameter: dRotation speed: NVertical axis: Discharge velocity (Vq) Blade tip peripheral speed (Vtip) Horizontal axis: Lower Impeller radiusD = 490 mmd/D = 0.3N = 300 min-1HR320 インペラ HR320 Impeller前進翼にしますと、翼背面における圧力分布によって表面の流れが内側に向かいます。それとともに、翼先端に向かって迎え角を減らす折り曲げ構造として、ねじり下げと同じ効果を担うことになります。これらの効果から、翼先端における流れの剥離を防ぎ吐出能力を向上させたインペラです。液面変動のない高レイノルズ数域の濃度や温度を均一に維持しつつ、大吐出流量を必要とする撹拌に適しています。前進翼効果に加え、翼表面の圧力をコントロールし、高い迎え角において翼表面の剥離を防ぎ、高吐出速度を得るために、航空機に用いる隙間フラップと同じ効果の二重翼構造としています。また、サタケ独自の翼端板を設けました。これによってスタビライザーリングを不要とし、液面通過運転を可能にしました。液面通過運転や翼取り付け高さが、極端に低い撹拌、及び固一液系の撹拌にすぐれています。P.T.V.流動解析結果C.F.D.による数値シミュレーション結果performance by L.D.V.ImpellerHigh Performance Impellers: HR320HR320HR320SHR320S
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