“铸造钛合金螺旋桨研究”一文中,其螺旋桨是离心浇注而成的。在计算铸型转速时,选取重力系数G值为180(第28页),但计算出转速并不高(G=180,n应为709转/分),原因何在?这是因为原公式转体半径的单位应是厘米,而该计算中的单位是以毫米代入的。 重力系数G=f/γ f=ρRω~2=(γ/g)Rω~2 将ω=πn/30,g=981厘米/秒~2代入上式并整理得: f=0.112(n/100)~2γ·R In his article “Casting Titanium Alloy Propeller Research”, the propeller is spun-cast. When calculating the mold rotation speed, the G value of the gravity coefficient is selected to be 180 (page 28), but the calculated rotation speed is not high (G = 180, n should be 709 rpm). What is the reason? Body radius of the unit should be centimeters, and the calculation of the unit is substituted in millimeters. Gravity factor G = f / γ f = ρRω ~ 2 = (γ / g) Rω ~ 2 Substituting ω = πn / 30 and g = 981 cm / ) ~ 2γ · R