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reciprocating axially
相关语句
  轴向往复运动
     Through the laboratory flow experiments with aqueous solution of varied consistency of HPAM ,the average flow rates calculated with the theoretical formulae are compared with those meassured in the experiments , and it shows that the numerical method of the unsteady flow of power-law fluid in eccentric annuli with the inner cylinder reciprocating axially in the paper is correct.
     在实验上,通过不同重量百分比浓度的HPAM水溶液在内管做轴向往复运动的偏心环空中非定常流实验,把由理论公式算得的时间平均流量与实验中测得的时间平均流量做了比较,验证了本文数值计算幂律流体在内管做轴向往复运动的偏心环空中非定常流方法的正确性;
短句来源
     Through the laboratory flow experiments with aqueous solution of varied consistency of HPAM ,the average flow rates calculated with the theoretical formulae are compared with those meassured in the experiments , and it shows that the numerical method of the unsteady flow of power-law fluid in eccentric annuli with the inner cylinder reciprocating axially in the paper is correct.
     在实验上,通过不同重量百分比浓度的HPAM水溶液在内管做轴向往复运动的偏心环空中非定常流实验,把由理论公式而算得的时间平均流量与实验中测得的时间平均流量做了比较,验证了本文数值计算幂律流体在内管做轴向往复运动的偏心环空中非定常流方法的正确性。
短句来源
     The basic equations of the unsteady flow of second order fluid with variable coefficients in the eccentric annuli with inner cylinder reciprocating axially in rectangular and bipolar coordinate are established respectively in this paper, and the formula of normal stress on the inner cylinder is given.
     分别建立了直角坐标系和双极坐标系下变系数二阶流体在内管做轴向往复运动的偏心环空中非定常流的基本方程; 建立了变系数二阶流体在内管做轴向往复运动的偏心环空中非定常流时内管壁上的压力分布公式。
短句来源
     The governing equations, initial and boundary condition equations, and instantaneous flow rate formula of unsteady flow of the Newtonian fluid in eccentric annuli with the inner cylinder reciprocating axially in bipolar coordinate system are established in this paper.
     建立了双极坐标系下牛顿流体在内管做轴向往复运动的偏心环空中非定常流的控制方程、初始条件和边界条件方程,以及瞬时流量计算公式。
     By the numerical calculation of the equations of motion, the velocity distribution, the instantaneous flow rate distribution, the average flow and the normal stress distribution on the inner cylinder of second order fluid with variable coefficients in the eccentric annuli with inner cylinder reciprocating axially are obtained;
     通过对运动方程的数值求解,获得了变系数二阶流体在内管做轴向往复运动的偏心环空中非定常流的速度分布、瞬时流量分布、平均流量和内管壁压力分布;
短句来源
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  “reciprocating axially”译为未确定词的双语例句
     Velocity distribution of fluid in eccentric annuli with the inner cylinder reciprocating axially
     流体在内管做轴向运动的偏心环空中的速度分布
短句来源
  相似匹配句对
     Velocity distribution of fluid in eccentric annuli with the inner cylinder reciprocating axially
     流体在内管做轴向运动的偏心环空中的速度分布
短句来源
     Unsteady Flow of Viscoelastic Fluid in Eccentric Annuli with Inner Cylinder Reciprocating Axially
     粘弹性流体在内管做轴向往复运动的偏心环空中的非定常流
短句来源
     The Volumetric Efficiency of Reciprocating Pumps
     往复泵的排量系数
短句来源
     Design of reciprocating circular orbit.
     圆周往复式循环轨道的设计方法
短句来源
     Recently, axially viewed ICP has appeared.
     近年来,出现了新型的端视ICP。
短句来源
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A pulsatile axial pump and a pulsatile centrifugal pump are developed. The pulsatile flow of impeller pump is discussed. In the pulsatile axial pump, the impeller reciprocates axially and rotates simultaneously. The reciprocation is driven by a pneumatic device and the rotation by a DC motor. FOr 5.3 kPa pulsatility of pressure, about 50 mm axial reciprocatiDg amplitude of the impeller is desirable. In order to reduce the axial amplitude, the pump inlet and the impeller both have cone -shaped heads, and...

A pulsatile axial pump and a pulsatile centrifugal pump are developed. The pulsatile flow of impeller pump is discussed. In the pulsatile axial pump, the impeller reciprocates axially and rotates simultaneously. The reciprocation is driven by a pneumatic device and the rotation by a DC motor. FOr 5.3 kPa pulsatility of pressure, about 50 mm axial reciprocatiDg amplitude of the impeller is desirable. In order to reduce the axial amplitude, the pump inlet and the impeller both have cone -shaped heads, and the gap between the impeller and the inlet pipe changes only 2 mm, namely, the impeller reciprocates 2 mm, a pressure pulsatility of 5.3 kPa can be produced. As the impeller rotates with constant speed, low turbulence in axial pthsatile pump may be expected. In centrifugal pulsatile PumP, the impeller changes its rotating speed periodically; the turbulence is reduced by designing an impeller with twisted vanes which enable the blood flow to change its direction rather than its magnitude during the periodic change of the rotating speed. In this way, a pulsatile flow is prepuced and the turbulence has been minimized. Compared to the axial pulsatile pump, the centrifugal pulsatile pump needs only one driver and thus has more reality for application. The centrifugal pulsatile pump is used in animal experiments. The pump assisted the circulation of the calves for several months without harm to the blood elements and the organ functions of the experimental animal. The experimentS demonstrated furthermore that the pulsatile impeller pump is the most efficient assist pump for heart recovery.

研制了一种轴流泵和一种离心泵。讨论了叶轮泵的搏动流。搏动流对于减少血液周身循环阻力具有重要意义,但利用叶轮泵产生搏动流将会导致血液破坏。搏动流叶轮血泵需要解决的问题是如何产生低扰动的搏动流。对于搏动流轴流泵,将泵的入口和叶轮外形轮廓设计成锥形,当叶轮以恒定的转速旋转时,搏动流轴流泵产生的搏动流可预期是低扰动的。对于搏动流离心泵,其搏动流的产生通过周期性的改变叶轮转速来实现,同时,设计出扭曲形叶片的叶轮,使血流的速度在叶轮周期性改变转这时只改变方向,而大小不变。通过这种方法,也可以产生搏动流,而且可将紊流减至最小。与搏动流轴流泵相比,搏动流离心泵只需要一个驱动部件,实用性更强。搏动流离心泵已成功试用于存活期达数月的小公牛血液辅助循环试验,没有发现明显的血液成分破坏和器官功能损坏。搏动流离心泵用作心功能恢复期间的循环辅助装置是最合适的,因为其不仅能像隔膜泵那样产生搏动流,减少了血液周身循环阻力,而且能像非搏动流旋转泵那样不发生倒流,从而增加了主动脉舒张压及自然心脏的冠状动脉灌注。

The governing equations of unsteady flow of nonNewtonian fluid in eccentric annuli with the inner cylinder reciprocating axially expressed in bipolar coordinate system are established in this paper.The equations are solved numerically in finite difference method for aqueous solution of HPAM and the curves of velocity distribution are plotted.The effects of the excentricity between the inner cylinder and the outer cylinder, the stroke and frequency of the inner cylinder on the velocity distribution of...

The governing equations of unsteady flow of nonNewtonian fluid in eccentric annuli with the inner cylinder reciprocating axially expressed in bipolar coordinate system are established in this paper.The equations are solved numerically in finite difference method for aqueous solution of HPAM and the curves of velocity distribution are plotted.The effects of the excentricity between the inner cylinder and the outer cylinder, the stroke and frequency of the inner cylinder on the velocity distribution of the fluid in eccentric annuli are analyzed.The results show that velocity distribution in the widest clearance is close to that in the narrowest clearance with the excentricity decreasing, and that the perturbation of velocity distribution is aggravated with the stroke and frequency increasing, which is caused by the inner cylinder reciprocating axially.

 本文建立了双极坐标系下非Newton流体在内管做轴向往复运动的偏心环空中非定常流的控制方程;并以HPAM水溶液为例,用有限差分法对控制方程进行了数值求解,绘制了这种流动的速度分布曲线;分析了环空内外管的偏心距、环空内管的冲程和冲次对流体在偏心环空中速度分布的影响。分析结果表明:随着环空偏心距减小,最宽和最窄间隙处的流体速度分布越来越接近;随着环空内管的冲程和冲次的增加,环空内管的轴向往复运动对流体速度分布的扰动增大。

For long-term application of the rotary pumps, it is necessary to solve the problems of bearing wear and thrombosis along the bearing. Currently, many investigators choose the magnetic bearing to realize zero-friction and no contact between the rotor and stator; the former avoids the mechanical wear and the latter eliminates the possibility of thrombus formation. We tried and found that it is difficult to apply a magnetic bearing to rotary pump without disturbing its simplicity, reliability and implantability;...

For long-term application of the rotary pumps, it is necessary to solve the problems of bearing wear and thrombosis along the bearing. Currently, many investigators choose the magnetic bearing to realize zero-friction and no contact between the rotor and stator; the former avoids the mechanical wear and the latter eliminates the possibility of thrombus formation. We tried and found that it is difficult to apply a magnetic bearing to rotary pump without disturbing its simplicity, reliability and implantability; therefore, we have developed a much simpler and much more creative approach to achieving the same results.Instead of the sliding bearing, a rolling bearing has been devised for the pump; its friction is about 1/15 of the sliding bearing. Furthermore, a wear-proof material of ultra-high-molecular weight polythene has been adopted in making the rollers, their anti-wear property is 8 times better than that of metal. Thereby, the service life of the bearing has extended to several years. For preventing the thrombus formation along the bearing, the impeller reciprocates axially as the impeller changes its rotating speed periodically to produce a pulsatile flow. The reciprocation is a result of the effects of a magnetic force between the motor rotor and stator, and a hydraulic force between the blood flow and the impeller. Similar to piston pump, the oscillating impeller can make the blood in and out of the bearing, resulting in wash-out once a circle. This is obviously beneficial to preventing thrombosis along the bearing and in the pump.The endurance tests with saline of this novel pump demonstrated a durability of the device. It promises to be able to assist the circulation of the patients permanently and to be able to replace the heart transplantation in the future.

叶轮血泵在解决血液相容性、可植入性及搏动流等一系列问题后 ,正面临使用耐久性的技术要求 ,即轴承的耐磨性及轴承处的抗血栓形成性能。为此 ,一种全新的方法应运而生。与过去采用滑动轴承不同 ,这次设计了一种滚动轴承 ,其摩擦约为滑动轴承的 1/ 15。同时 ,滚子材料采用超高分子量聚乙烯 ,耐磨性是金属的 8倍。根据相关技术资料 ,这种滚动轴承的寿命可达数年以上。为了防止轴承处形成血栓 ,血泵叶轮不仅周期性改变转速产生搏动流 ,同时作轴向往复运动。转子轴向运动是电机定子、转子间的电磁力和血流、叶轮间的液力相互作用的结果。与活塞泵相似 ,转子的轴向运动能使血液进入、排出轴承 ,每个周期可洗刷轴承一次 ,从而有利于防止在轴承和血泵中生成血栓。采用生理盐水进行寿命试验表明该新颖装置具有耐久性 ,有望能够永久性辅助病人的血液循环 ,并在不久的将来替代心脏移植。

 
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