Thiswork explores the thrust vector control in a 2Dconvergent divergent nozzlewith wedge shaped jet tab.The Computational analysis has been carried out with different thickness and height of jet tabs.The flow topology...Thiswork explores the thrust vector control in a 2Dconvergent divergent nozzlewith wedge shaped jet tab.The Computational analysis has been carried out with different thickness and height of jet tabs.The flow topology analysis is carried out qualitatively and quantitatively.The wedge-shaped jet tabs with 10%,20%,30%and 40%of height and 10 mm,12 mm,14 mm,16 mm thickness are considered for right isosceles,left isosceles and isosceles shapes.The deflection angle is calculated to identify the best effective thrust deflection configuration.Results indicate that,when thickness and height of jet tab increases the deflection angle reduces due to the formation of mixing layer and shock wave generation.Also,depending on the shape of jet tab the oblique shock formation and angle of shock varied.The thickness-based CFD optimization shows that a 4.66°deflection angle with 10 mm thickness and 40%height isosceles tab produces the best deflection.The right jet tab with 12 mm and 14 mm thickness with 30%and 20%height shows 4.75°and 4.14°deflection angle.In the case of 16 mm thickness tab,left isosceles jet tab with 10%height shows 4.14°of deflection angle.It is concluded form the study that,the highest rate of deflection was produced by the right isosceles tab with 12 mm thickness and 30%height.This can be used for thrust deflection in supersonic aircrafts and missiles.展开更多
Rockets are a kind of missile that does not have a control system.But this does not mean that they fly entirely without control.Although these types of flying devices use a parabolic path for their movement,however,ce...Rockets are a kind of missile that does not have a control system.But this does not mean that they fly entirely without control.Although these types of flying devices use a parabolic path for their movement,however,certain types of them can fly a straight path even with arbitrary launch angles.In the matter of rocket control,due to its type of fuel,very short flight time,as well as weight restrictions,the use of controllers such as fixed aerodynamic fins/tabs on the body is more useful and practical.The main goal of this article is to analyze and choose a safe and improvement layout of the trim tabs and how to arrange them using calculations related to aerodynamic parameters and flight dynamics for direct flight control in rockets.For this purpose,trim tabs with triangular,trapezoidal,and square designs and with the ability to be installed as tail and/or canard trim tabs have been used and modeled.Finally,the performance of the models is compared to each other and the best or most reliable and improvement arrangement mode/model is presented along with the results.展开更多
2024年,广东某电厂新建9F级燃气-蒸汽联合循环机组,汽机由上海汽轮机厂提供并配套数字电液调节控制系统(Digital Electro-Hydraulic Control System,DEH)。DEH采用西门子T3000控制系统,主机分散控制系统(Distributed Control System,DCS...2024年,广东某电厂新建9F级燃气-蒸汽联合循环机组,汽机由上海汽轮机厂提供并配套数字电液调节控制系统(Digital Electro-Hydraulic Control System,DEH)。DEH采用西门子T3000控制系统,主机分散控制系统(Distributed Control System,DCS)采用科远NT6000 V5 DCS。第一套机组汽机首次冲转调试期间,DEH启动顺控启动(Sequence Guide Control,SGC)程序,无法实现自动定速3009 r/min,启动装置TAB自动设定值无法满足汽机定速的需求。针对无法自动定速的问题,进行了过程分析,并针对相关控制逻辑给出了优化方法,实现DEH冲转自动定速3009 r/min,为同类型机组问题提供了参考和借鉴。展开更多
目的比较和分析Rpl32和Rpl13作为单内参基因与两者作为双内参基因,用于检测大鼠挫伤肌肉组织中TAB2 m RNA表达量的结果。方法 78只SD大鼠,随机分为正常对照组(1组)和肌肉损伤组(12组)。采用自由落体法制作大鼠肌肉挫伤模型,分别于4h^48...目的比较和分析Rpl32和Rpl13作为单内参基因与两者作为双内参基因,用于检测大鼠挫伤肌肉组织中TAB2 m RNA表达量的结果。方法 78只SD大鼠,随机分为正常对照组(1组)和肌肉损伤组(12组)。采用自由落体法制作大鼠肌肉挫伤模型,分别于4h^48h之间12个时间点取肌肉组织,提取总RNA、合成c DNA、采用real-time q PCR法,以Rpl32和Rpl13作为单独内参基因和二者作为双内参基因检测大鼠肌肉挫伤组织中TAB2 m RNA相对表达量,并计算检测结果的变异系数。结果以Rpl32或Rpl13单独作为内参基因或作为双内参基因,TAB2 m RNA表达随损伤时间总体均呈现降低的变化规律,但使用单内参基因在24h和32h出现极高值,而用双内参基因计算未出现极值,且各结果的变异系数均较小。结论 Rpl32和Rpl13作为双内参基因用于计算TAB2 m RNA相对表达量,可提高分析结果的准确性,在相关实验中建议选择使用。展开更多
文摘Thiswork explores the thrust vector control in a 2Dconvergent divergent nozzlewith wedge shaped jet tab.The Computational analysis has been carried out with different thickness and height of jet tabs.The flow topology analysis is carried out qualitatively and quantitatively.The wedge-shaped jet tabs with 10%,20%,30%and 40%of height and 10 mm,12 mm,14 mm,16 mm thickness are considered for right isosceles,left isosceles and isosceles shapes.The deflection angle is calculated to identify the best effective thrust deflection configuration.Results indicate that,when thickness and height of jet tab increases the deflection angle reduces due to the formation of mixing layer and shock wave generation.Also,depending on the shape of jet tab the oblique shock formation and angle of shock varied.The thickness-based CFD optimization shows that a 4.66°deflection angle with 10 mm thickness and 40%height isosceles tab produces the best deflection.The right jet tab with 12 mm and 14 mm thickness with 30%and 20%height shows 4.75°and 4.14°deflection angle.In the case of 16 mm thickness tab,left isosceles jet tab with 10%height shows 4.14°of deflection angle.It is concluded form the study that,the highest rate of deflection was produced by the right isosceles tab with 12 mm thickness and 30%height.This can be used for thrust deflection in supersonic aircrafts and missiles.
文摘Rockets are a kind of missile that does not have a control system.But this does not mean that they fly entirely without control.Although these types of flying devices use a parabolic path for their movement,however,certain types of them can fly a straight path even with arbitrary launch angles.In the matter of rocket control,due to its type of fuel,very short flight time,as well as weight restrictions,the use of controllers such as fixed aerodynamic fins/tabs on the body is more useful and practical.The main goal of this article is to analyze and choose a safe and improvement layout of the trim tabs and how to arrange them using calculations related to aerodynamic parameters and flight dynamics for direct flight control in rockets.For this purpose,trim tabs with triangular,trapezoidal,and square designs and with the ability to be installed as tail and/or canard trim tabs have been used and modeled.Finally,the performance of the models is compared to each other and the best or most reliable and improvement arrangement mode/model is presented along with the results.
基金supported by the Youth Fund of Anhui Natural Science Foundation(2108085QE241)National Key Research and Development Program of China(2021YFE0200100)+2 种基金Fundamental Research Funds for the Central Universities(PA2021KCPY0038)Department of Housing and Urban-Rural Development of Anhui Province(2020-YF36)Anhui Natural Science Research Projects of Universities(KJ2020A0462).
文摘目的比较和分析Rpl32和Rpl13作为单内参基因与两者作为双内参基因,用于检测大鼠挫伤肌肉组织中TAB2 m RNA表达量的结果。方法 78只SD大鼠,随机分为正常对照组(1组)和肌肉损伤组(12组)。采用自由落体法制作大鼠肌肉挫伤模型,分别于4h^48h之间12个时间点取肌肉组织,提取总RNA、合成c DNA、采用real-time q PCR法,以Rpl32和Rpl13作为单独内参基因和二者作为双内参基因检测大鼠肌肉挫伤组织中TAB2 m RNA相对表达量,并计算检测结果的变异系数。结果以Rpl32或Rpl13单独作为内参基因或作为双内参基因,TAB2 m RNA表达随损伤时间总体均呈现降低的变化规律,但使用单内参基因在24h和32h出现极高值,而用双内参基因计算未出现极值,且各结果的变异系数均较小。结论 Rpl32和Rpl13作为双内参基因用于计算TAB2 m RNA相对表达量,可提高分析结果的准确性,在相关实验中建议选择使用。
