英国Euromatic Machine and Oil有限公司已设计出一种新型三相流量计,可替代常规测试分离器在海上采油平台和海底使用。该流量计能给出单井生产的油、气、水瞬时质量读数,并通过电缆或声纳传至控制中心。操作人员既能把数口井的油输至...英国Euromatic Machine and Oil有限公司已设计出一种新型三相流量计,可替代常规测试分离器在海上采油平台和海底使用。该流量计能给出单井生产的油、气、水瞬时质量读数,并通过电缆或声纳传至控制中心。操作人员既能把数口井的油输至总管汇,又可准确地掌握单井产量。该流量计的唯一可动部件是涡轮流量计,润湿部件均由镀钛不锈钢制成。展开更多
Pressure losses in flow components are generally characterized either by pressure loss coefficients or by discharge coefficients. The pressure drop for incompressible flow across a screen of fractional free area a is ...Pressure losses in flow components are generally characterized either by pressure loss coefficients or by discharge coefficients. The pressure drop for incompressible flow across a screen of fractional free area a is often calculated from widely used correlation provided in Perry＇s Handbook. This correlation was developed based on experimental work which have covered a wide range of fractional free area （a = 0.14 to 0.79）. The present work aims at validation for a flow in plain square mesh screen with a particular fractional free area （porosity, a） of 0.25 using CFD （Computational Fluid Dynamics） approach. The simulations are carried out for wide range of screen Reynolds number （Re = 0.1 to 105） covering both laminar and turbulent flow regimes. Initial simulations are carried out for incompressible fluid （water） and further extended to compressible fluid （air）. Discharge coefficients obtained from the simulations are compared with experimental values. Effect of compressibility on discharge coefficients is described.展开更多
The actuator is the key component in the optical pickup.How to evaluate the performance of the actuator becomes more and more important in the design process.The characteristic parameters of the actuator are explained...The actuator is the key component in the optical pickup.How to evaluate the performance of the actuator becomes more and more important in the design process.The characteristic parameters of the actuator are explained in this paper,and the practical test methods are also given in details.展开更多
The technology of optical pickup is the fundamental technology of the optical disk system,and the industry of optical pickup affects the development of the whole optical disk industry.The actuator is the key component...The technology of optical pickup is the fundamental technology of the optical disk system,and the industry of optical pickup affects the development of the whole optical disk industry.The actuator is the key component of the optical pickup and its characteristic parameters determine the quality of the optical pickup directly.The R&D status of the actuator is reviewed.Also,the relevant key parameters of the optical pickup are summarized,and the developing directions are analyzed.展开更多
文摘英国Euromatic Machine and Oil有限公司已设计出一种新型三相流量计,可替代常规测试分离器在海上采油平台和海底使用。该流量计能给出单井生产的油、气、水瞬时质量读数,并通过电缆或声纳传至控制中心。操作人员既能把数口井的油输至总管汇,又可准确地掌握单井产量。该流量计的唯一可动部件是涡轮流量计,润湿部件均由镀钛不锈钢制成。
文摘Pressure losses in flow components are generally characterized either by pressure loss coefficients or by discharge coefficients. The pressure drop for incompressible flow across a screen of fractional free area a is often calculated from widely used correlation provided in Perry＇s Handbook. This correlation was developed based on experimental work which have covered a wide range of fractional free area （a = 0.14 to 0.79）. The present work aims at validation for a flow in plain square mesh screen with a particular fractional free area （porosity, a） of 0.25 using CFD （Computational Fluid Dynamics） approach. The simulations are carried out for wide range of screen Reynolds number （Re = 0.1 to 105） covering both laminar and turbulent flow regimes. Initial simulations are carried out for incompressible fluid （water） and further extended to compressible fluid （air）. Discharge coefficients obtained from the simulations are compared with experimental values. Effect of compressibility on discharge coefficients is described.
文摘The actuator is the key component in the optical pickup.How to evaluate the performance of the actuator becomes more and more important in the design process.The characteristic parameters of the actuator are explained in this paper,and the practical test methods are also given in details.
文摘The technology of optical pickup is the fundamental technology of the optical disk system,and the industry of optical pickup affects the development of the whole optical disk industry.The actuator is the key component of the optical pickup and its characteristic parameters determine the quality of the optical pickup directly.The R&D status of the actuator is reviewed.Also,the relevant key parameters of the optical pickup are summarized,and the developing directions are analyzed.
