离心超重力环境下流体中物体浮力与运动

为了表征离心超重力环境下物体在流体中的运动规律,基于旋转非惯性系,考虑吊篮摆动遗留角的影响,推导由地球常重力和离心超重力共同产生的试验超重力场的重力势、静止流体压力及流体中物体承受流体浮力的表达式.基于Newton第二定律建立离心模型试验中静止流体内物体运动的控制方程,编制并验证了数值求解程序.流体中圆球运动的数值分析结果表明,当离心加速度较大时,吊篮摆动遗留角的影响可以忽略.试验超重力等势面是以离心机主轴为轴线的旋转抛物面,随着离心加速度的增大,等势面形态受地球重力的影响逐渐减小,趋于圆柱面.物体在流体中所受的浮力具有向心性和非均匀性.物体在流体中运动时,科氏力的影响不可忽略.

Buoyancy and motion of objects in fluid in centrifugal hypergravity environment

The expressions of the test hypergravity potential generated by the earth gravity and the centrifugal hypergravity, the static fluid pressure and the buoyancy of an object in fluid were derived in the rotational non-inertial frame by considering the residual angle of the suspended basket in order to characterize the motion law of object in fluid under the centrifugal hypergravity environment. The motion equation of a rigid object in static fluid in centrifugal model test was established based on Newton’s second law, and its numerical solution program was compiled and verified. The numerical analysis results of sphere motion in fluid show that the residual angle of the suspended basket can be ignored under high centrifugal acceleration. The equipotential surface of test hypergravity is a rotating paraboloid with the centrifuge spindle as the axis. The influence of earth gravity on the equipotential surface is gradually reduced with the increase of centrifugal acceleration. The shape of the equipotential surface tends to be a cylindrical surface. The buoyancy is centripetal and non-uniform, and the influence of the Coriolis force cannot be ignored when the object moves in fluid.