Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc. submitted time 2018-01-05 Cooperative journals: 《工程热物理学报》
Abstract:离心式涡轮增压器透平具有与传统透平不一样的结构,本文对某一小流量、高转速、小轮径的离心式透平进行一维气动设计、三维流场模拟与优化以及变工况性能研究。首先,对流体工质以及流动过程进行简化处理,获得一维气动设计的结果;接着,采用计算流体力学软件对离心透平级进行数值模拟,通过改变叶片数目、叶片厚度、中弧线形状等进行叶型优化,获得更合理的流场;最后,分析不同转速、不同流量(背压)下离心式透平的变工况性能。
Subjects: Dynamic and Electric Engineering >> Engineering Thermophysics submitted time 2017-11-07 Cooperative journals: 《工程热物理学报》
Abstract: The structure of centrifugal turbine of turbocharger is different from the traditional turbine's, in this paper, one dimensional pneumatic design, three dimensional flow field simulation and optimization, and variable condition performance will be studied for a small flow rate, high rotating speed and small wheel diameter centrifugal turbine. First of all, the result of one dimensional pneumatic design can be obtained by simplifying the fluid medium and flow process; Then, the numerical simulation and optimization of centrifugal turbine can be conducted adopting the computational fluid dynamics software by changing the leaf number, leaf thickness, and the arc shape of leaf to get a more reasonable flow field; Finally, the result of centrifugal turbine off-design performance under different rotational speed and different flow rate(back pressure) will be analyzed.
Subjects: Dynamic and Electric Engineering >> Engineering Thermophysics submitted time 2017-05-24 Cooperative journals: 《工程热物理学报》
Abstract:离心透平的通流部件主要包括:进气道、静叶栅、动叶栅、无叶扩压器、出气道,本文对除静叶栅、动叶栅之外的静止通流部件的子午面进行设计。进气道子午面设计采用等截面法,保证级前进气均匀、轴向对称;无叶扩压器采用与叶栅等高的平行侧壁形式,最佳出口直径根据整机效率最优的原则得到;出气道子午面采用与叶栅等高的圆弧扩压弯管设计。结果表明,该方法设计静止通流部件简单易行,特别适合工程应用,以某一离心透平为例,数值模拟得到的级效率为88.51 %,整机效率为90.34 %,轮周功为478.9 kW,性能达到预期。
Subjects: Dynamic and Electric Engineering >> Engineering Thermophysics submitted time 2018-02-01 Cooperative journals: 《工程热物理学报》
Abstract: This paper presents a flow control method using micro-cylinder installed in front of the blade leading edge and invests the aerodynamic performance of the VAWT equipped with micro-cylinders. Numerical results suggest that the flow separation is effectively controlled by setting a micro-cylinder in front of the blade leading edge when the blade works at large attack angle. Meanwhile, the VAWT equipped with micro-cylinders has higher efficiency than regular VAWT under small tip speed ratio.
Subjects: Dynamic and Electric Engineering >> Engineering Thermophysics submitted time 2017-11-23 Cooperative journals: 《工程热物理学报》
Abstract:本文以R123为流动工质,进行离心透平级的一维热力计算,并通过数值模拟分析ORC离心透平级内流动情况及变工况性能。结果表明:在设计工况下,数值模拟结果与一维设计结果基本一致,功率与效率偏差在1 %以内,符合设计要求。在变工况下,进汽压力在0.33 MPa~0.88 MPa变化时,效率随进汽压力增大先增大后减小,流量和功率随进汽压力增大而增大;背压在0.10 MPa~0.18 MPa变化,在临界工况下运行,效率和功率随着背压的增大而减小,流量保持不变;初温改变对透平性能影响较小,效率变化范围在1 %以内;转速变化时,流量不变,效率先增大后减小,设计转速下效率最高。
Subjects: Dynamic and Electric Engineering >> Engineering Thermophysics submitted time 2017-10-30 Cooperative journals: 《工程热物理学报》
Abstract:本文以R123为流动工质,进行离心透平级的一维热力计算,并通过数值模拟分析ORC离心透平级内流动情况及变工况性能。结果表明:在设计工况下,数值模拟结果与一维设计结果基本一致,功率与效率偏差在1 %以内,符合设计要求。在变工况下,进汽压力在0.33 MPa~0.88 MPa变化时,效率随进汽压力增大先增大后减小,流量和功率随进汽压力增大而增大;背压在0.10 MPa~0.18 MPa变化,在临界工况下运行,效率和功率随着背压的增大而减小,流量保持不变;初温改变对透平性能影响较小,效率变化范围在1 %以内;转速变化时,流量不变,效率先增大后减小,设计转速下效率最高。
Subjects: Other Disciplines >> Synthetic discipline submitted time 2023-03-28 Cooperative journals: 《中国科学院院刊》
Abstract: The rapid development of data-intensive emerging application areas in recent years is one of major characteristics of the extensive and in-depth applications of high performance computing (HPC). The HPC applications in the emerging areas bring new challenges and opportunities at all levels of HPC, including system technological innovation, computing environment innovation, and application innovation. Based on reviewing the application progress of HPC in the emerging areas, this paper summarizes the current technical characteristics and challenges, and provides strategic recommendations for the development of emerging HPC application areas, including increasing the core technology innovation of HPC systems, building HPC environment for emerging application areas, promoting the development of HPC application software and new methods for traditional applications, as well as promoting the development of benchmarking tools in new areas such as big data and artificial intelligence.