An overview of some popular rotary and reciprocating positive displacement( PD) pump types is given with the objective of presenting and comparing the respective sizing relationships and performance features. Reciproc...An overview of some popular rotary and reciprocating positive displacement( PD) pump types is given with the objective of presenting and comparing the respective sizing relationships and performance features. Reciprocating pumps discussed are the piston and plunger types. Rotary pumps addressed are gear( external and internal),vane,lobe,screw,and liquid ring pumps. To put the relative pump sizes in perspective,attention is fixed on the rotors or reciprocating elements of PD pumps,just as impellers indicate the sizes of rotodynamic pumps. The size of a PD pump is found from a dimensionless combination of displacement flow rate,rotative speed and diameter. The flow rate,head( or pressure rise) and power are related through the component efficiencies. The cavitation coefficient,often close to unity,connects the rotor tip speed or piston speed with the required NPSH,which can also be affected by the pressure rise of the pump due to leakage across the internal clearances. Operational effects due to cavitation,ingestion of gas or abrasives,and viscous and non-Newtonian fluids are discussed.展开更多
介绍了采用Ф460 mm PQF连轧管机组热轧,再经Ф720 mm斜轧扩径机组旋轧扩径,生产大直径中薄壁P91无缝钢管的生产工艺;分析了生产的P91无缝钢管的性能。结果表明:采用旋轧扩径工艺生产的P91无缝钢管,其化学成分、成品几何尺寸和力学性能...介绍了采用Ф460 mm PQF连轧管机组热轧,再经Ф720 mm斜轧扩径机组旋轧扩径,生产大直径中薄壁P91无缝钢管的生产工艺;分析了生产的P91无缝钢管的性能。结果表明:采用旋轧扩径工艺生产的P91无缝钢管,其化学成分、成品几何尺寸和力学性能等均满足相关标准要求;其持久强度与常规热轧管机组生产的相当,产品可以在高温高压环境下应用。展开更多
大粒径级配碎石混合料相较于常规粒径级配碎石混合料具有更优的承载能力和力学性能,但关于其抗变形能力的室内研究仍落后于工程实际。为了研究道路基层材料大粒径级配碎石在循环旋转轴压下的变形规律,使用自研道路材料振动旋转压实仪,...大粒径级配碎石混合料相较于常规粒径级配碎石混合料具有更优的承载能力和力学性能,但关于其抗变形能力的室内研究仍落后于工程实际。为了研究道路基层材料大粒径级配碎石在循环旋转轴压下的变形规律,使用自研道路材料振动旋转压实仪,对大粒径级配碎石混合料进行振动旋转压实成型,然后使用循环旋转轴压对成型试件施加重复荷载。引入安定理论,研究了不同级配大粒径碎石试件在循环旋转轴压下的变形行为,并评价了其安定性行为,分析了级配参数对其最终累积应变、安定性行为的影响。测试了大粒径级配碎石试样的CBR值,分析了其骨架性能与其抗变形能力之间的关联。结果表明:大粒径级配碎石试件较常规粒径级配碎石试件具有更优的骨架性能、抗变形和承载能力及更高的安定临界荷载;随着循环旋转轴压荷载等级的提升,试件累积轴向应变不断增大,且增大的速率有上升的趋势;大粒径碎石试件的安定临界荷载最高可达215 k Pa,破坏临界荷载在320 k Pa左右,当试件大粒径碎石含量恰当且密实度较高时具有更优的力学性能;CBR值越高的试样其抗变形能力越强,在重复荷载作用下CBR值越高的试样其最终累积轴向应变越小。展开更多
文摘An overview of some popular rotary and reciprocating positive displacement( PD) pump types is given with the objective of presenting and comparing the respective sizing relationships and performance features. Reciprocating pumps discussed are the piston and plunger types. Rotary pumps addressed are gear( external and internal),vane,lobe,screw,and liquid ring pumps. To put the relative pump sizes in perspective,attention is fixed on the rotors or reciprocating elements of PD pumps,just as impellers indicate the sizes of rotodynamic pumps. The size of a PD pump is found from a dimensionless combination of displacement flow rate,rotative speed and diameter. The flow rate,head( or pressure rise) and power are related through the component efficiencies. The cavitation coefficient,often close to unity,connects the rotor tip speed or piston speed with the required NPSH,which can also be affected by the pressure rise of the pump due to leakage across the internal clearances. Operational effects due to cavitation,ingestion of gas or abrasives,and viscous and non-Newtonian fluids are discussed.
文摘介绍了采用Ф460 mm PQF连轧管机组热轧,再经Ф720 mm斜轧扩径机组旋轧扩径,生产大直径中薄壁P91无缝钢管的生产工艺;分析了生产的P91无缝钢管的性能。结果表明:采用旋轧扩径工艺生产的P91无缝钢管,其化学成分、成品几何尺寸和力学性能等均满足相关标准要求;其持久强度与常规热轧管机组生产的相当,产品可以在高温高压环境下应用。
文摘大粒径级配碎石混合料相较于常规粒径级配碎石混合料具有更优的承载能力和力学性能,但关于其抗变形能力的室内研究仍落后于工程实际。为了研究道路基层材料大粒径级配碎石在循环旋转轴压下的变形规律,使用自研道路材料振动旋转压实仪,对大粒径级配碎石混合料进行振动旋转压实成型,然后使用循环旋转轴压对成型试件施加重复荷载。引入安定理论,研究了不同级配大粒径碎石试件在循环旋转轴压下的变形行为,并评价了其安定性行为,分析了级配参数对其最终累积应变、安定性行为的影响。测试了大粒径级配碎石试样的CBR值,分析了其骨架性能与其抗变形能力之间的关联。结果表明:大粒径级配碎石试件较常规粒径级配碎石试件具有更优的骨架性能、抗变形和承载能力及更高的安定临界荷载;随着循环旋转轴压荷载等级的提升,试件累积轴向应变不断增大,且增大的速率有上升的趋势;大粒径碎石试件的安定临界荷载最高可达215 k Pa,破坏临界荷载在320 k Pa左右,当试件大粒径碎石含量恰当且密实度较高时具有更优的力学性能;CBR值越高的试样其抗变形能力越强,在重复荷载作用下CBR值越高的试样其最终累积轴向应变越小。
