V型混合机是预混合饲料厂和药厂最常采用的混合机,为了研究不同装载系数和混合时间对预混料混合均匀度的影响,探求V型混合机在添加剂预混料生产中合理的装载系数和最佳的混合时间。采用甲基紫示踪法,以玉米粉为原料,采用两因素随机分组...V型混合机是预混合饲料厂和药厂最常采用的混合机,为了研究不同装载系数和混合时间对预混料混合均匀度的影响,探求V型混合机在添加剂预混料生产中合理的装载系数和最佳的混合时间。采用甲基紫示踪法,以玉米粉为原料,采用两因素随机分组实验设计方案,分为5个装载系数(20%、30%、40%、50%和60%)和3个不同混合时间(8、10、15 m in)对饲料混合均匀度的影响进行研究。结果表明:V型混合机的最佳装载系数为30%,最佳的混合时间为10 m in。展开更多
Radial turbine stages are often used for applications requiring off-design operation,as turbocharging for instance.The off-design ability of such stages is commonly analyzed through the traditional turbine map,plottin...Radial turbine stages are often used for applications requiring off-design operation,as turbocharging for instance.The off-design ability of such stages is commonly analyzed through the traditional turbine map,plotting the reduced mass-flow against the pressure-ratio,for reduced-speed lines.However,some alternatives are possible,such as the flow-coefficient(Ψ)to loading-coefficient(φ)diagram where the pressure-ratio lines are actually straight lines,very convenient property to perform prediction.A robust method re-creating this map from a predicted Ψ-φ diagram is needed.Recent work has shown that this back-deduction quality,without the use of any loss models,depends on the knowledge of an intermediate pressure-ratio.A modelization of this parameter is then proposed.The comparison with both experimental and CFD results is presented,with quite good agreement for mass flow rate and rotational speed,and for the intermediate pressure ratio.The last part of the paper is dedicated to the application of the intermediate pressure-ratio knowledge to the improvement of the deduction of the pressure ratio lines in the Ψ-φ diagram.Beside this improvement,the back-deduction method of the classical map is structured,applied and evaluated.展开更多
文摘V型混合机是预混合饲料厂和药厂最常采用的混合机,为了研究不同装载系数和混合时间对预混料混合均匀度的影响,探求V型混合机在添加剂预混料生产中合理的装载系数和最佳的混合时间。采用甲基紫示踪法,以玉米粉为原料,采用两因素随机分组实验设计方案,分为5个装载系数(20%、30%、40%、50%和60%)和3个不同混合时间(8、10、15 m in)对饲料混合均匀度的影响进行研究。结果表明:V型混合机的最佳装载系数为30%,最佳的混合时间为10 m in。
文摘Radial turbine stages are often used for applications requiring off-design operation,as turbocharging for instance.The off-design ability of such stages is commonly analyzed through the traditional turbine map,plotting the reduced mass-flow against the pressure-ratio,for reduced-speed lines.However,some alternatives are possible,such as the flow-coefficient(Ψ)to loading-coefficient(φ)diagram where the pressure-ratio lines are actually straight lines,very convenient property to perform prediction.A robust method re-creating this map from a predicted Ψ-φ diagram is needed.Recent work has shown that this back-deduction quality,without the use of any loss models,depends on the knowledge of an intermediate pressure-ratio.A modelization of this parameter is then proposed.The comparison with both experimental and CFD results is presented,with quite good agreement for mass flow rate and rotational speed,and for the intermediate pressure ratio.The last part of the paper is dedicated to the application of the intermediate pressure-ratio knowledge to the improvement of the deduction of the pressure ratio lines in the Ψ-φ diagram.Beside this improvement,the back-deduction method of the classical map is structured,applied and evaluated.
